SQ24T10050NDASG_技术文档

SQ24 Series

Data Sheet

The new SemiQ™ Family of DC/DC converters from di/dt

provides a high efficiency single output in a size that is only

60% of industry-standard quarter bricks, while preserving the

same pinout and functionality.

In high temperature environments, for output voltages rang-

ing from 3.3V to 1.0V, the thermal performance of SemiQ™

converters exceeds that of most competitors' 20-30A quarter

bricks. This is accomplished through the use of patent pend-

ing circuit, packaging and processing techniques to achieve

ultra-high efficiency, excellent thermal management and a

very low body profile.

SQ24T and SQ24S Converters

Features

•

Delivers up to 15A (50 W)

Available in through-hole and SM packages

Lowest weight in industry: 0.53 oz (15 g)

Lowest profile in industry: 0.274” (6.96 mm)

Extremely small footprint: 0.896” x 2.30” (2.06 in²)

Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0,

1.8, 1.5, 1.2 and 1.0V

Low body profile and the preclusion of heat sinks minimize

airflow shadowing, thus enhancing cooling for downstream

devices. The use of 100% automation for assembly, coupled

with di/dt’s advanced electric and thermal design, results in a

product with extremely high reliability.

Operating from a 18-36V input, the SQ24 Series converters

of the SemiQ™ Family provides any standard output volt-

age from 12V down to 1.0V. Outputs can be trimmed from –

20% to +10% of the nominal output voltage (±10% for output

voltages 1.2V and 1.0V), thus providing outstanding design

flexibility.

•

High efficiency – no heat sink required

On-board input differential LC-filter

Extremely low output and input ripple

Start up into pre-biased output

No minimum load required

Meets Basic Insulation requirements of EN60950

Fixed frequency operation

With a standard pinout and trim equations, the SQ24 Series

converters are perfect drop-in replacements for existing

quarter brick designs. Inclusion of this converter in new de-

signs can result in significant board space and cost savings.

The device is also available in a surface mount package.

Fully protected

Remote output sense

Output voltage trim range: +10%/−20% (except 1.2V

and 1.0V outputs with trim range ±10%) with industry-

standard trim equations

•

High reliability: MTBF of 3.4 million hours, calculated

per Telcordia TR-332, Method I Case 1

Positive or negative logic ON/OFF option

UL 60950 recognition in US and Canada and DEMKO

certification per IEC/EN 60950

In both cases the designer can expect reliability improve-

ment over other available converters because of the SQ24

Series’ optimized thermal efficiency.

•

Meets conducted emissions requirements of FCC

Class B and EN 55022 Class B with external filter

All materials meet UL94, V-0 flammability rating

Applications

•

Telecommunications

Datacommunications

Wireless

Servers

SQ24 Family DS Ver 5 05-14-04

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SQ24 Series

Data Sheet

Electrical Specifications (common to all versions)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, All output voltages, unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous

0

-40

-55

40

85

125

Vdc

°C

Operating Ambient Temperature

Storage Temperature

INPUT CHARACTERISTICS

Operating Input Voltage Range

Input Under Voltage Lockout

Turn-on Threshold

18

24

36

Vdc

Non-latching

16

15

17

16

17.5

16.5

Vdc

Turn-off Threshold

ISOLATION CHARACTERISTICS

I/O Isolation

2000

Vdc

pF

Isolation Capacitance:

1.0 - 3.3V

5.0 - 6.0V

8.0V, 12V

160

260

230

pF

MΩ

Isolation Resistance

10

FEATURE CHARACTERISTICS

Switching Frequency

415

kHz

%

Output Voltage Trim Range¹

Industry-std. equations (1.5 - 12V)

Industry-std. equations (1.0 - 1.2V)

Percent of V_OUT(NOM)

-20

-10

+10

140

%

Remote Sense Compensation¹

Output Over-Voltage Protection

%

ms

Non-latching (1.5 - 12V)

117

124

125

132

100

4

Non-latching (1.0 - 1.2V)

Auto-Restart Period

Turn-On Time

Applies to all protection features

ON/OFF Control (Positive Logic)

Converter Off

-20

2.4

0.8

20

Vdc

Converter On

ON/OFF Control (Negative Logic)

Converter Off

2.4

-20

20

0.8

Vdc

Converter On

Additional Notes:

1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources

should not exceed 10% of V_OUT(NOM), in order to insure specified operation of over-voltage protection circuitry. See “Output Voltage Adjust/Trim” for

detailed information.

SQ24 Family DS Ver 5 05-14-04

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SQ24 Series

Data Sheet

be used to drive the input of the ON/OFF pin. The device

must be capable of sinking up to 0.2mA at a low level volt-

age of ≤ 0.8V. An external voltage source (±20V maximum)

may be connected directly to the ON/OFF input, in which

case it must be capable of sourcing or sinking up to 1mA

depending on the signal polarity. See the Start-up Informa-

tion section for system timing waveforms associated with

use of the ON/OFF pin.

Operation

Input and Output Impedance

These power converters have been designed to be stable

with no external capacitors when used in low inductance in-

put and output circuits.

However, in many applications, the inductance associated

with the distribution from the power source to the input of the

converter can affect the stability of the converter. The addi-

tion of a 100µF electrolytic capacitor with an ESR < 1Ω

across the input helps ensure stability of the converter. In

many applications, the user has to use decoupling capaci-

tance at the load. The power converter will exhibit stable op-

eration with external load capacitance up to 1000µF on

12V, 2,200µF on 8.0V, 10,000 µF on 5.0V – 6.0V, and

15,000µF on 3.3V – 1.0V outputs.

Remote Sense (Pins 5 and 7)

The remote sense feature of the converter compensates for

voltage drops occurring between the output pins of the con-

verter and the load. The SENSE(-) (Pin 5) and SENSE(+)

(Pin 7) pins should be connected at the load or at the point

where regulation is required (see Fig. B).

TM

Rw

Family

Semi

Q

Vout (+)

100

Vin (+)

ON/OFF

Vin (-)

Converter

ON/OFF (Pin 2)

SENSE (+)

(Top View)

Rload

TRIM

Vin

The ON/OFF pin is used to turn the power converter on or

off remotely via a system signal. There are two remote con-

trol options available, positive logic and negative logic and

both are referenced to Vin(-). Typical connections are shown

in Fig. A.

SENSE (-)

10

Vout (-)

Rw

Fig. B: Remote sense circuit configuration.

TM

Family

Sem_CoiQ_nverter

Vin (+)

ON/OFF

Vin (-)

Vout (+)

SENSE (+)

TRIM

If remote sensing is not required, the SENSE(-) pin must be

connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin

must be connected to the Vout(+) pin (Pin 8) to ensure the

converter will regulate at the specified output voltage. If

these connections are not made, the converter will deliver an

output voltage that is slightly higher than the specified value.

(Top View)

Rload

Vin

SENSE (-)

Vout (-)

CONTROL

INPUT

Because the sense leads carry minimal current, large traces

on the end-user board are not required. However, sense

traces should be located close to a ground plane to minimize

system noise and insure optimum performance. When wiring

discretely, twisted pair wires should be used to connect the

sense lines to the load to reduce susceptibility to noise.

Fig. A: Circuit configuration for ON/OFF function.

The positive logic version turns on when the ON/OFF pin is

at logic high and turns off when at logic low. The converter is

on when the ON/OFF pin is left open.

The converter’s output over-voltage protection (OVP) senses

the voltage across Vout(+) and Vout(-), and not across the

sense lines, so the resistance (and resulting voltage drop)

between the output pins of the converter and the load should

be minimized to prevent unwanted triggering of the OVP.

The negative logic version turns on when the pin is at logic

low and turns off when the pin is at logic high. The ON/OFF

pin can be hard wired directly to Vin(-) to enable automatic

power up of the converter without the need of an external

control signal.

When utilizing the remote sense feature, care must be taken

not to exceed the maximum allowable output power capabil-

ON/OFF pin is internally pulled-up to 5 V through a resistor.

A mechanical switch, open collector transistor, or FET can

SQ24 Family DS Ver 5 05-14-04

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SQ24 Series

Data Sheet

ity of the converter, equal to the product of the nominal out-

put voltage and the allowable output current for the given

conditions.

TM

Family

Sem_CoiQ_nverter

Vin (+)

ON/OFF

Vin (-)

Vout (+)

SENSE (+)

TRIM

(Top View)

R _T-INCR

Rload

When using remote sense, the output voltage at the con-

verter can be increased by as much as 10% above the

nominal rating in order to maintain the required voltage

across the load. Therefore, the designer must, if necessary,

decrease the maximum current (originally obtained from the

derating curves) by the same percentage to ensure the con-

verter’s actual output power remains at or below the maxi-

mum allowable output power.

Vin

SENSE (-)

Vout (-)

Fig. C: Configuration for increasing output voltage.

To decrease the output voltage (Fig. D), a trim resistor,

R

_T-DECR, should be connected between the TRIM (Pin 6) and

SENSE(-) (Pin 5), with a value of:

Output Voltage Adjust /TRIM (Pin 6)

511

R

T−DECR

=

−10.22

[kΩ]

(1.0 – 12V)

The converter’s output voltage can be adjusted up 10% or

down 20% for Vout ≥ 1.5V, and ±10% for Vout = 1.2V and

1.0 V, relative to the rated output voltage by the addition of

an externally connected resistor. For output voltages 3.3V,

trim up to 10% is guaranteed only at Vin ≥ 20V, and it is

marginal (8% to 10%) at Vin = 18V depending on load cur-

rent.

| ∆ |

where,

R

T−DECR

=

Required value of trim-down resistor [kΩ]

and

∆

is as defined above.

Note: The above equations for calculation of trim resistor

values match those typically used in conventional industry-

standard quarter bricks and one-eighth bricks.

The TRIM pin should be left open if trimming is not being

used. To minimize noise pickup, a 0.1 µF capacitor is con-

nected internally between the TRIM and SENSE(-) pins.

Converters with output voltage 1.2V and 1.0V have specific

trim schematic and equations, to provide the customers with

the flexibility of second sourcing. For these converters, the

last character of part number is “T”. More information about

trim feature, including corresponding schematic portions, can

be found in Application Note 103.

To increase the output voltage, refer to Fig. C. A trim resis-

tor, R_T-INCR, should be connected between the TRIM (Pin 6)

and SENSE(+) (Pin 7), with a value of:

5.11(100 + ∆)V^O−NOM− 626

TM

R

T−INCR

=

− 10.22 [kΩ] (1.5 –12V)

Family

Sem_CoiQ_nverter

Vin (+)

ON/OFF

Vin (-)

Vout (+)

SENSE (+)

TRIM

1.225∆

(Top View)

485

Rload

T−INCR

[kΩ] (1.2V)

[kΩ] (1.0V)

Vin

R_T-DECR

∆

SENSE (-)

Vout (-)

323

∆

− 2

where,

Fig. D: Configuration for decreasing output voltage.

Trimming/sensing beyond 110% of the rated output voltage

is not an acceptable design practice, as this condition could

cause unwanted triggering of the output over-voltage protec-

tion (OVP) circuit. The designer should ensure that the dif-

ference between the voltages across the converter’s output

pins and its sense pins does not exceed 10% of V_OUT(NOM),

or:

RT−INCR = Required value of trim-up resistor kΩ]

VO−NOM = Nominal value of output voltage [V]

(V^O-REQ− V^O-NOM)

∆ =

X 100 [%]

V^{O -NOM}

VO−REQ = Desired (trimmed) output voltage [V].

[VOUT(+) − VOUT(−)]−[VSENSE(+) − VSENSE(−)] ≤ VO - NOM X10% [V]

When trimming up, care must be taken not to exceed the

converter‘s maximum allowable output power. See previous

section for a complete discussion of this requirement.

This equation is applicable for any condition of output sens-

ing and/or output trim.

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SQ24 Series

Data Sheet

To comply with safety agencies requirements, an input line

fuse must be used external to the converter. The Table be-

low provides the recommended fuse rating for use with this

family of products.

Protection Features

Input Under-Voltage Lockout

Input under-voltage lockout is standard with this converter.

The converter will shut down when the input voltage drops

below a pre-determined voltage.

Output Voltage

3.3V

Fuse Rating

8A

6A

4A

12V - 5.0V, 2.5V

2.0V - 1.0V

The input voltage must be at least 17.5V for the converter to

turn on. Once the converter has been turned on, it will shut

off when the input voltage drops below 15V. This feature is

beneficial in preventing deep discharging of batteries used in

telecom applications.

If one input fuse is used for a group of modules, the maxi-

mum fuse rating should not exceed 15-A (SQ modules are

UL approved with up to a 15-A fuse).

Electromagnetic Compatibility (EMC)

Output Over-Current Protection (OCP)

EMC requirements must be met at the end-product system

level, as no specific standards dedicated to EMC character-

istics of board mounted component dc-dc converters exist.

However, di/dt tests its converters to several system level

standards, primary of which is the more stringent EN55022,

Information technology equipment - Radio disturbance char-

acteristics - Limits and methods of measurement.

The converter is protected against over-current or short cir-

cuit conditions. Upon sensing an over-current condition, the

converter will switch to constant current operation and

thereby begin to reduce output voltage. When the output

voltage drops below 50% of the nominal value of output volt-

age, the converter will shut down.

Once the converter has shut down, it will attempt to restart

nominally every 100 ms with a typical 1-2% duty cycle. The

attempted restart will continue indefinitely until the overload

or short circuit conditions are removed or the output voltage

rises above 50% of its nominal value.

With the addition of a simple external filter (see application

notes), all versions of the SQ24 Series of converters pass

the requirements of Class B conducted emissions per

EN55022 and FCC, and meet at a minimum, Class A radi-

ated emissions per EN 55022 and Class B per FCC Title

47CFR, Part 15-J. Please contact di/dt Applications Engi-

neering for details of this testing.

Output Over-Voltage Protection (OVP)

The converter will shut down if the output voltage across

Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of

the OVP circuitry. The OVP circuitry contains its own refer-

ence, independent of the output voltage regulation loop.

Once the converter has shut down, it will attempt to restart

every 100 ms until the OVP condition is removed.

Characterization

General Information

The converter has been characterized for many operational

aspects, to include thermal derating (maximum load current

as a function of ambient temperature and airflow) for vertical

and horizontal mounting, efficiency, start-up and shutdown

parameters, output ripple and noise, transient response to

load step-change, overload and short circuit.

Over-Temperature Protection (OTP)

The converter will shut down under an over-temperature

condition to protect itself from overheating caused by opera-

tion outside the thermal derating curves, or operation in ab-

normal conditions such as system fan failure. After the con-

verter has cooled to a safe operating temperature, it will

automatically restart.

The figures are numbered as Fig. x.y, where x indicates the

different output voltages, and y is associated with a specific

plot (y = 1 for the vertical thermal derating, …). For example,

Fig. x.1 will refer to the vertical thermal derating for all the

output voltages in general.

Safety Requirements

The converters meet North American and International

safety regulatory requirements per UL60950 and EN60950.

Basic Insulation is provided between input and output.

The following pages contain specific plots or waveforms as-

sociated with the converter. Additional comments for specific

data are provided below.

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SQ24 Series

Data Sheet

Test Conditions

All data presented were taken with the converter soldered to

a test board, specifically a 0.060” thick printed wiring board

(PWB) with four layers. The top and bottom layers were not

metalized. The two inner layers, comprising two-ounce cop-

per, were used to provide traces for connectivity to the con-

verter.

The lack of metalization on the outer layers as well as the

limited thermal connection ensured that heat transfer from

the converter to the PWB was minimized. This provides a

worst-case but consistent scenario for thermal derating pur-

poses.

Fig. H: Location of the thermocouple for thermal testing.

Efficiency

All measurements requiring airflow were made in di/dt’s ver-

tical and horizontal wind tunnel facilities using Infrared (IR)

thermography and thermocouples for thermometry.

Fig. x.5 shows the efficiency vs. load current plot for ambient

temperature of 25ºC, airflow rate of 300 LFM (1.5m/s) with

vertical mounting and input voltages of 18V, 24V and 36V.

Also, a plot of efficiency vs. load current, as a function of

ambient temperature with Vin = 24V, airflow rate of 200 LFM

(1 m/s) with vertical mounting is shown in Fig. x.6.

Ensuring components on the converter do not exceed their

ratings is important to maintaining high reliability. If one an-

ticipates operating the converter at or close to the maximum

loads specified in the derating curves, it is prudent to check

actual operating temperatures in the application. Thermo-

graphic imaging is preferable; if this capability is not avail-

able, then thermocouples may be used. di/dt recommends

the use of AWG #40 gauge thermocouples to ensure meas-

urement accuracy. Careful routing of the thermocouple leads

will further minimize measurement error. Refer to Figure H

for optimum measuring thermocouple location.

Power Dissipation

Fig. x.7 shows the power dissipation vs. load current plot for

Ta = 25ºC, airflow rate of 300 LFM (1.5m/s) with vertical

mounting and input voltages of 18V, 24V and 36V. Also, a

plot of power dissipation vs. load current, as a function of

ambient temperature with Vin = 24V, airflow rate of 200 LFM

(1 m/s) with vertical mounting is shown in Fig. x.8.

Thermal Derating

Load current vs. ambient temperature and airflow rates are

given in Fig. x.1 for through-hole version. Ambient tempera-

ture was varied between 25°C and 85°C, with airflow rates

from 30 to 500 LFM (0.15 to 2.5m/s), and vertical and hori-

zontal converter mounting.

Start-up

Output voltage waveforms, during the turn-on transient using

the ON/OFF pin for full rated load currents (resistive load)

are shown without and with external load capacitance in

Fig. x.9 and Fig. x.10, respectively.

For each set of conditions, the maximum load current was

defined as the lowest of:

(i) The output current at which any FET junction temperature

did not exceed a maximum specified temperature (120°C) as

indicated by the thermographic image, or

Ripple and Noise

Fig. x.13 shows the output voltage ripple waveform, meas-

ured at full rated load current with a 10 µF tantalum and 1 µF

ceramic capacitor across the output. Note that all output

voltage waveforms are measured across a 1 µF ceramic ca-

pacitor.

(ii) The nominal rating of the converter (4A on 12V, 5.3A on

8.0V, 8A on 6.0V, 10A on 5.0V, and 15A on 3.3 – 1.0V).

During normal operation, derating curves with maximum FET

temperature less than or equal to 120°C should not be ex-

ceeded. Temperature on the PCB at the thermocouple loca-

tion shown in Fig. H should not exceed 118°C in order to

operate inside the derating curves.

The input reflected ripple current waveforms are obtained

using the test setup shown in Fig x.14. The corresponding

waveforms are shown in Fig. x.15 and Fig. x.16.

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SQ24 Series

Data Sheet

Start-up Information (using negative ON/OFF)

VIN

Scenario #1: Initial Start-up From Bulk Supply

ON/OFF function enabled, converter started via application of V_IN.

See Figure E.

Time

Comments

ON/OFF

STATE

t₀

ON/OFF pin is ON; system front end power is toggled

on, V_INto converter begins to rise.

OFF

ON

t₁

t₂

t₃

V_INcrosses Under-Voltage Lockout protection circuit

threshold; converter enabled.

Converter begins to respond to turn-on command (con-

verter turn-on delay).

V^OUT

Converter V_OUTreaches 100% of nominal value.

For this example, the total converter start-up time (t₃- t₁) is typically

4 ms.

t

t⁰

t1 t2

t3

Fig. E: Start-up scenario #1

Scenario #2: Initial Start-up Using ON/OFF Pin

With V_INpreviously powered, converter started via ON/OFF pin.

See Figure F.

VIN

Time

Comments

t₀

t₁

V_INPUTat nominal value.

Arbitrary time when ON/OFF pin is enabled (converter

enabled).

ON/OFF

STATE

OFF

ON

t₂

t₃

End of converter turn-on delay.

Converter V_OUTreaches 100% of nominal value.

For this example, the total converter start-up time (t₃- t₁) is typically

4 ms.

VOUT

Scenario #3: Turn-off and Restart Using ON/OFF Pin

With V_INpreviously powered, converter is disabled and then en-

abled via ON/OFF pin. See Figure G.

t

t0

t1 t2

t3

Time

Comments

Fig. F: Start-up scenario #2.

t₀

t₁

V_INand V_OUTare at nominal values; ON/OFF pin ON.

ON/OFF pin arbitrarily disabled; converter output falls

to zero; turn-on inhibit delay period (100 ms typical) is

initiated, and ON/OFF pin action is internally inhibited.

ON/OFF pin is externally re-enabled.

VIN

t₂

If (t₂- t₁) ≤ 100 ms, external action of ON/OFF pin

is locked out by start-up inhibit timer.

If (t₂- t₁) > 100 ms, ON/OFF pin action is internally

enabled.

100 ms

ON/OFF

STATE

OFF

ON

t₃

Turn-on inhibit delay period ends. If ON/OFF pin is ON,

converter begins turn-on; if off, converter awaits

ON/OFF pin ON signal; see Figure F.

t₄

t₅

End of converter turn-on delay.

V^OUT

Converter V_OUTreaches 100% of nominal value.

For the condition, (t₂- t₁) ≤ 100 ms, the total converter start-up

time (t₅- t₂) is typically 104 ms. For (t₂- t₁) > 100 ms, start-up will

be typically 4 ms after release of ON/OFF pin.

t

t0

t1

t2

t3 t4

t5

Fig. G: Start-up scenario #3.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S04120 (12 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=12 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

4 Adc, 12 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

3.1

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

3

100

6

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

11.880

12.000

12.120

Vdc

Over Line

±4

±10

12.180

120

1000

4

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

11.820

0

90

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

5

7.5

5.5

10

1

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

1 µF ceramic

150

200

20

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

87

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S04120 (12 Volts Out)

5

4

3

2

1

0

5

4

3

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

500 LFM (2.5 m/s)

2

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

1

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 12V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T04120 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

Fig. 12V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T04120 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

5

4

5

4

3

500 LFM (2.5 m/s)

2

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

1

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 12V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S04120 converter mounted horizontally

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

Fig. 12V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S04120 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S04120 (12 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

1

2

3

4

5

0

1

2

3

4

5

Load Current [Adc]

Fig. 12V.5: Efficiency vs. load current and input voltage for

SQ24T/S04120 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 12V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S04120 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

10.00

8.00

6.00

4.00

10.00

8.00

6.00

4.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

0.00

0

1

2

3

4

5

0

1

2

3

4

5

Load Current [Adc]

Fig. 12V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S04120 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 12V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S04120 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S04120 (12 Volts Out)

Fig. 12V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (5 V/div.). Time scale: 1 ms/div.

Fig. 12V.10: Turn-on transient at full rated load current (resis-

tive) plus 1,000µF at Vin = 24V, triggered via ON/OFF pin. Top

trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(5 V/div.). Time scale: 2 ms/div.

Fig. 12V.12: Output voltage response to load current step-

change (1A – 2A – 1A) at Vin = 24V. Top trace: output voltage

(200 mV/div.). Bottom trace: load current (1 A/div.). Current

slew rate: 5 A/µs. Co = 1 µF ceramic. Time scale: 0.5 ms/div.

Fig. 12V.11: Output voltage response to load current step-

change (1A – 2A – 1A) at Vin = 24V. Top trace: output voltage

(200 mV/div.). Bottom trace: load current (1 A/div.). Current

slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.5 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S04120 (12 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 12V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 12V.13: Output voltage ripple (50 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 12V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 12V.14 for test setup. Time scale: 1 µs/div.

Fig. 12V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 12V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S04120 (12 Volts Out)

15

10

5

0

6

0

1

2

3

4

5

Iout [Adc]

Fig. 12V.18: Load current (top trace, 5 A/div., 20 ms/div.) into

a 10 mΩ short circuit during restart, at Vin = 24V. Bottom trace

(5 A/div., 1 ms/div.) is an expansion of the on-time portion of

the top trace.

Fig. 12V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S05080 (8.0 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24 Vdc, Vout=8.0 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

5.3 Adc, 8.0 Vdc Out @ 18 Vdc In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25MHz bandwidth

2.8

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

2.6

68

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

6

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

7.920

8.000

8.080

Vdc

Over Line

±4

±10

8.120

100

2200

5.3

6.75

12

1

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

7.880

0

70

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

6.25

10

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 94 µF tant. + 1 µF ceramic

160

400

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

85.5

87

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

6

5

4

3

2

1

0

0.95

0.90

0.85

0.80

0.75

0.70

0.65

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

36 V

24 V

18 V

30 LFM (0.15 m/s)

20

30

40

50

60

70

80

90

0

1

2

3

4

5

6

Ambient Temperature [°C]

Load Current [Adc]

Fig. 8.0V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T05080 converter with D height pins

mounted vertically with Vin = 24 V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 8.0V.2: Efficiency vs. load current and input voltage for

SQ24T/S05080 converter mounted vertically with air flowing from

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S08060 (6.0 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=6.0 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

8 Adc, 6.0 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

3.1

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

2.6

88

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

6

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

5.940

6.000

6.060

Vdc

Over Line

±2

±5

6.090

60

10,000

8

11.5

25

2.5

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

5.910

0

45

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

10

15

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

100

80

200

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

89

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S08060 (6.0 Volts Out)

10

8

6

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

4

2

0

4

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

2

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 6.0V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T08060 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 6.0V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T08060 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

10

8

10

8

6

500 LFM (2.5 m/s)

4

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

2

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 6.0V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S08060 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

Fig. 6.0V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S08060 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S08060 (6.0 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

0

2

4

6

8

10

Load Current [Adc]

Fig. 6.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S08060 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 6.0V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S08060 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

10.00

8.00

6.00

4.00

10.00

8.00

6.00

4.00

72 V

48 V

36 V

70 C

55 C

40 C

2.00

0.00

0

2

4

6

8

10

0

2

4

6

8

10

Load Current [Adc]

Fig. 6.0V.7: Power dissipation vs. load current and ambient

temperature for SQ24T/S08060 converter mounted vertically

with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5

m/s) and Ta = 25°C.

Fig. 6.0V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S08060 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

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SQ24 Series

Data Sheet

SQ24T/S08060 (6.0 Volts Out)

Fig. 6.0V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (2 V/div.). Time scale: 1 ms/div.

Fig. 6.0V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (2 V/div.). Time scale: 2 ms/div.

Fig. 6.0V.11: Output voltage response to load current step-

change (2A – 4A – 2A) at Vin = 24V. Top trace: output voltage

(100mV/div.). Bottom trace: load current (2A/div.). Current slew

rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.2 ms/div.

Fig. 6.0V.12: Output voltage response to load current step-

change (2A – 4A – 2A) at Vin = 24V. Top trace: output voltage

(100mV/div.). Bottom trace: load current (2A/div.). Current slew

rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ceramic. Time scale:

0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S08060 (6.0 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 6.0V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 6.0V.13: Output voltage ripple (50 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 6.0V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 6.0V.14 for test setup. Time scale: 1 µs/div.

Fig. 6.0V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 6.0V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S08060 (6.0 Volts Out)

8

6

4

2

0

12

0

3

6

9

Iout [Adc]

Fig. 6.0V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 6.0V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S10050 (5.0 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=5.0 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

INPUT CHARACTERISTICS

Maximum Input Current

10 Adc, 5.0 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

3.3

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

3

93

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

6

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

4.950

5.000

5.050

Vdc

Over Line

±2

±5

5.075

80

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

4.925

0

45

10,000

10

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

12.5

20

14

30

3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

140

90

200

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

86

87

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S10050 (5.0 Volts Out)

12

10

8

12

10

8

6

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

4

2

0

4

2

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 5.0V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T10050 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 5.0V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T10050 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

12

10

8

12

10

8

6

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

4

2

0

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

4

2

0

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 5.0V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S10050 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 5.0V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S10050 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S10050 (5.0 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

0

2

4

6

8

10

12

Load Current [Adc]

Fig. 5.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S10050 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 5.0V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S10050 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

10.00

8.00

6.00

4.00

10.00

8.00

6.00

4.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

0.00

0

2

4

6

8

10

12

0

2

4

6

8

10

12

Load Current [Adc]

Fig. 5.0V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S10050 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 5.0V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S10050 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S10050 (5.0 Volts Out)

Fig. 5.0V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (2 V/div.). Time scale: 2 ms/div.

Fig. 5.0V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (2 V/div.). Time scale: 2 ms/div.

Fig. 5.0V.12: Output voltage response to load current step-

change (2.5A – 5A – 2.5A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (2 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 5.0V.11: Output voltage response to load current step-

change (2.5A – 5A – 2.5A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (2 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.2

ms/div.

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SQ24 Series

Data Sheet

SQ24T/S10050 (5.0 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 5.0V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 5.0V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 5.0V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 5.0V.14 for test setup. Time scale: 1 µs/div.

Fig. 5.0V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 5.0V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S10050 (5.0 Volts Out)

6.0

5.0

4.0

3.0

2.0

1.0

0

5

10

15

Iout [Adc]

Fig. 5.0V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 5.0V.18: Load current (top trace, 10 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (10 A/div., 1 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S15033 (3.3 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=3.3 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

15 Adc, 3.3 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

3.2

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

3

100

6

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

3.267

3.300

3.333

Vdc

Over Line

±2

±5

3.350

50

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

3.250

0

30

15,000

15

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

18

30

20

40

5.3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

100

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

88

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S15033 (3.3 Volts Out)

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 3.3V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T15033 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 3.3V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T15033 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 3.3V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S15033 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 3.3V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S15033 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S15033 (3.3 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 3.3V.5: Efficiency vs. load current and input voltage for

SQ24T/S15033 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 3.3V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S15033 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

8.00

6.00

4.00

8.00

6.00

4.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

0.00

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 3.3V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15033 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 3.3V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S15033 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S15033 (3.3 Volts Out)

Fig. 3.3V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.). Time scale: 2 ms/div.

Fig. 3.3V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 2 ms/div.

Fig. 3.3V.12: Output voltage response to load current step-

change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 3.3V.11: Output voltage response to load current step-

change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:

0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S15033 (3.3 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 3.3V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 3.3V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 3.3V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 3.3V.14 for test setup. Time scale: 1 µs/div.

Fig. 3.3V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 3.3V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S15033 (3.3 Volts Out)

4

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 3.3V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 3.3V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S15025 (2.5 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=2.5 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

15 Adc, 2.5 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

2.5

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

3

67

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

6

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

2.475

2.500

2.525

Vdc

Over Line

±2

±5

2.538

50

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

2.462

0

30

15,000

15

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

18

30

20

40

5.3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic)

Co = 450 µF tant. + 1 µF ceramic

110

120

150

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

86.5

87

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S15025 (2.5 Volts Out)

20

15

10

5

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.5V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T15025 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

Fig. 2.5V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T15025 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.5V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S15025 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 2.5V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S15025 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S15025 (2.5 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.5V.5: Efficiency vs. load current and input voltage for

SQ24T/S15025 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 2.5V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S15025 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

8.00

6.00

4.00

8.00

6.00

4.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

0.00

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.5V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15025 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 2.5V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S15025 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S15025 (2.5 Volts Out)

Fig. 2.5V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.). Time scale: 1 ms/div.

Fig. 2.5V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 1 ms/div.

Fig. 2.5V.11: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:

0.2 ms/div.

Fig. 2.5V.12: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S15025 (2.5 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 2.5V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 2.5V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 2.5V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 2.5V.14 for test setup. Time scale: 1 µs/div.

Fig. 2.5V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 2.5V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S15025 (2.5 Volts Out)

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 2.5V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 2.5V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S15020 (2.0 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=2.0 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

2

Maximum Input Current

15 Adc, 2.0 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

3

57

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

6

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

1.98

2.000

2.02

Vdc

Over Line

±2

±5

2.030

50

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

1.970

0

30

15,000

15

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

18

30

20

40

5.3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

100

120

150

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

85

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S15020 (2.0 Volts Out)

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.0V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T15020 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 2.0V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T15020 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.0V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S15020 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 2.0V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S15020 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S15020 (2.0 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S15020 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 2.0V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S15020 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

6.00

5.00

4.00

3.00

6.00

5.00

4.00

3.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

1.00

0.00

1.00

0.00

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.0V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15020 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 2.0V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S15020 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S15020 (2.0 Volts Out)

Fig. 2.0V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.). Time scale: 1 ms/div.

Fig. 2.0V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 1 ms/div.

Fig. 2.0V.12: Output voltage response to load current step-

change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 2.0V.11: Output voltage response to load current step-

change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:

0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S15020 (2.0 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 2.0V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 2.0V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 2.0V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 2.0V.14 for test setup. Time scale: 1 µs/div.

Fig. 2.0V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 2.0V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S15020 (2.0 Volts Out)

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 2.0V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 2.0V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S15018 (1.8 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.8 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

15 Adc, 1.8 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

1.8

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

3

53

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

6

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

1.782

1.800

1.818

Vdc

Over Line

±2

±4

±5

1.827

50

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

1.773

0

30

15,000

15

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

18

30

20

40

5.3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

100

120

150

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

84.5

84

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S15018 (1.8 Volts Out)

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.8V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T15018 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 1.8V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T15018 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.8V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S15018 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 1.8V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S15018 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S15018 (1.8 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.8V.5: Efficiency vs. load current and input voltage for

SQ24T/S15018 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 1.8V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S15018 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

6.00

5.00

4.00

3.00

6.00

5.00

4.00

3.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

1.00

0.00

1.00

0.00

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.8V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15018 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 1.8V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S15018 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S15018 (1.8 Volts Out)

Fig. 1.8V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.). Time scale: 1 ms/div.

Fig. 1.8V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 1 ms/div.

Fig. 1.8V.12: Output voltage response to load current step-

change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.8V.11: Output voltage response to load current step-

change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:

0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S15018 (1.8 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 1.8V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 1.8V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 1.8V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.8V.14 for test setup. Time scale: 1 µs/div.

Fig. 1.8V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.8V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S15018 (1.8 Volts Out)

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 1.8V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 1.8V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S15015 (1.5 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.5 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

1.6

Maximum Input Current

15 Adc, 1.5 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

2.6

48

6

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

1.485

1.500

1.515

Vdc

Over Line

±2

±4

1.523

50

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

1.477

0

30

15,000

15

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

18

30

20

40

5.3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

80

120

170

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

83

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S15015 (1.5 Volts Out)

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.5V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T15015 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 1.5V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T15015 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.5V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S15015 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 1.5V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S15015 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S15015 (1.5 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.5V.5: Efficiency vs. load current and input voltage for

SQ24T/S15015 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 1.5V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S15015 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

6.00

5.00

4.00

3.00

6.00

5.00

4.00

3.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

1.00

0.00

1.00

0.00

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.5V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15015 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 1.5V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S15015 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S15015 (1.5 Volts Out)

Fig. 1.5V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.5V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.5V.12: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.5V.11: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:

0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S15015 (1.5 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 1.5V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 1.5V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 1.5V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.5V.14 for test setup. Time scale: 1 µs/div.

Fig. 1.5V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.5V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S15015 (1.5 Volts Out)

2.0

1.5

1.0

0.5

0

20

0

5

10

15

Iout [Adc]

Fig. 1.5V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 1.5V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S15012 (1.2 Volts Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.2 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

15 Adc, 1.2 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

1.25

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

2.6

43

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

6

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

1.188

1.200

1.212

Vdc

Over Line

±1

±3

1.218

50

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

1.182

0

30

15,000

15

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

18

30

20

40

5.3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

90

120

200

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

81

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S15012 (1.2 Volts Out)

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.2V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T15012 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 1.2V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T15012 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.2V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S15012 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 1.2V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S15012 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S15012 (1.2 Volts Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.2V.5: Efficiency vs. load current and input voltage for

SQ24T/S15012 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 1.2V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S15012 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

6.00

5.00

4.00

3.00

6.00

5.00

4.00

3.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

1.00

0.00

1.00

0.00

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.2V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15012 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 1.2V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S15012 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S15012 (1.2 Volts Out)

Fig. 1.2V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.2V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.2V.12: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.2V.11: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:

0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S15012 (1.2 Volts Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 1.2V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 1.2V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 1.2V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.2V.14 for test setup. Time scale: 1 µs/div.

Fig. 1.2V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.2V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S15012 (1.2 Volts Out)

1.5

1.0

0.5

0

20

0

5

10

15

Iout [Adc]

Fig. 1.2V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-

tion of the top trace.

Fig. 1.2V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

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SQ24 Series

Data Sheet

Electrical Specifications: SQ24T/S15010 (1.0 Volt Out)

Conditions: T_A=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.0 Vdc unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current

15 Adc, 1.0 Vdc Out @ 18 Vdc In

Vin = 24V, converter disabled

Vin = 24V, converter enabled

25MHz bandwidth

1.1

Adc

mAdc

mA_PK-PK

dB

Input Stand-by Current

2.6

43

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

7.5

120Hz

TBD

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load)

Output Regulation

0.990

1.000

1.010

Vdc

Over Line

±1

±2

±3

1.015

50

mV

Vdc

mV_PK-PK

µF

Over Load

Output Voltage Range

Output Ripple and Noise - 25MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Over line, load and temperature²

Full load + 10 µF tantalum + 1 µF ceramic

Plus full load (resistive)

0.985

0

30

15,000

15

Adc

A

Non-latching

Non-latching. Short=10mꢀ.

Non-latching

18

30

20

40

5.3

Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 0.1 A/µS

di/dt = 5 A/µS

Co = 1 µF ceramic

Co = 450 µF tant. + 1 µF ceramic

80

140

180

mV

µs

Setting Time to 1%

EFFICIENCY

100% Load

79

%

50% Load

Additional Notes: 2.

-40ºC to 85ºC

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SQ24 Series

Data Sheet

SQ24T/S15010 (1.0 Volt Out)

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.0V.1: Available load current vs. ambient air temperature

and airflow rates for SQ24T15010 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin

1 and maximum FET temperature ≤ 120°C.

Fig. 1.0V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T15010 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to

pin 1 and maximum FET temperature ≤ 120°C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.0V.4: Available load current vs. ambient temperature

and airflow rates for SQ24S15010 converter mounted horizon-

tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-

mum FET temperature ≤ 120°C.

Fig. 1.0V.3: Available load current vs. ambient temperature

and airflow rates for SQ24S15010 converter mounted vertically

with Vin = 24V, air flowing from pin 3 to pin 1 and maximum

FET temperature ≤ 120°C.

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SQ24 Series

Data Sheet

SQ24T/S15010 (1.0 Volt Out)

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.95

0.90

0.85

0.80

0.75

0.70

0.65

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S15010 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =

25°C.

Fig. 1.0V.6: Efficiency vs. load current and ambient tempera-

ture for SQ24T/S15010 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200

LFM (1.0 m/s).

6.00

5.00

4.00

3.00

6.00

5.00

4.00

3.00

70 C

55 C

40 C

36 V

24 V

18 V

2.00

1.00

0.00

1.00

0.00

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.0V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15010 converter mounted vertically

with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of

200 LFM (1.0 m/s).

Fig. 1.0V.7: Power dissipation vs. load current and input volt-

age for SQ24T/S15010 converter mounted vertically with air

flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25°C.

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SQ24 Series

Data Sheet

SQ24T/S15010 (1.0 Volt Out)

Fig. 1.0V.10: Turn-on transient at full rated load current (resis-

tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.0V.9: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 24V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.0V.12: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.0V.11: Output voltage response to load current step-

change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-

put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).

Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:

0.2 ms/div.

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SQ24 Series

Data Sheet

SQ24T/S15010 (1.0 Volt Out)

i_S

i_C

10 µH

source

TM

33 µF

1 µF

Family

Semi

Q

inductance

Ω

ESR <1

ceramic

DC/DC

Vout

electrolytic

capacitor

Converter

Vsource

Fig. 1.0V.13: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 µF tantalum +

1uF ceramic and Vin = 24V. Time scale: 1 µs/div.

Fig. 1.0V.14: Test Set-up for measuring input reflected ripple

currents, i_cand i_s.

Fig. 1.0V.15: Input reflected ripple current, i_c(100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.0V.14 for test setup. Time scale: 1 µs/div.

Fig. 1.0V.16: Input reflected ripple current, i_s(10 mA/div.),

measured through 10 µH at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.0V.14 for test setup. Time scale:

1µs/div.

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SQ24 Series

Data Sheet

SQ24T/S15010 (1.0 Volt Out)

1.5

1.0

0.5

0

20

0

5

10

15

Iout [Adc]

Fig. 1.0V.17: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 1.0V.18: Load current (top trace, 20 A/div., 20 ms/div.)

into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom

trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-

tion of the top trace.

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SQ24 Series

Data Sheet

Physical Information

SQ24S Platform Notes

•

All dimensions are in inches [mm]

Connector Material: Copper

Connector Finish: Gold over Nickel

Optional: Tin/Lead over Nickel

•

Converter Weight: 0.53 oz [15 g]

Recommended Surface-Mount Pads:

Min. 0.080” X 0.112” [2.03 x 2.84]

Max. 0.092” X 0.124” [2.34 x 3.15]

1

2

8

7

6

5

4

TOP VIEW

3

Pad/Pin Connections

Pad/Pin #

Function

Vin (+)

ON/OFF

Vin (-)

Vout (-)

SENSE(-)

TRIM

SENSE(+)

Vout (+)

SIDE VIEW

1

2

3

4

5

6

7

8

SQ24S Pinout (Surface Mount)

HT

CL

(Max. Height)

(Min. Clearance)

Height

Option

+0.000 [+0.00]

-0.038 [- 0.97]

0.319 [8.10]

0.352 [8.94]

0.516 [13.11]

0.416 [10.57]

0.298 [7.57]

+0.016 [+0.41]

-0.000 [- 0.00]

0.030 [0.77]

0.063 [1.60]

0.227 [5.77]

0.127 [3.23]

0.009 [0.23]

A

B

C

D

E

1

2

3

8

7

6

5

4

PL

Pin Length

TOP VIEW

SIDE VIEW

Option

±0.005 [±0.13]

A

B

C

0.188 [4.77]

0.145 [3.68]

0.110 [2.79]

SQ24T Platform Notes

•

All dimensions are in inches [mm]

Pins 1-3 and 5-7 are Ø 0.040” [1.02]

with Ø 0.078” [1.98] shoulder

Pins 4 and 8 are Ø 0.062” [1.57]

without shoulder

•

SQ24T Pinout (Through-hole)

•

Pin material: Brass

Pin Finish: Tin/Lead over Nickel

Converter Weight: 0.53 oz [15 g]

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SQ24 Series

Data Sheet

Converter Part Numbering Scheme

Product

Series

Input

Mounting

Scheme

Rated Load

Current

Output

ON/OFF

Logic

Maximum

Special

Voltage

Height [HT]

Length [PL]

Features

SQ

24

T

05

080

-

N

B

A

0

15 ⇒ 15 A

(1.0 – 3.3 V)

010 ⇒ 1.0 V

012 ⇒ 1.2 V

015 ⇒ 1.5 V

018 ⇒ 1.8 V

020 ⇒ 2.0 V

025 ⇒ 2.5 V

033 ⇒ 3.3 V

050 ⇒ 5.0 V

060 ⇒ 6.0 V

080 ⇒ 8.0 V

120 ⇒ 12.0 V

0 ⇒ STD

SMT

10 ⇒ 10 A

S ⇒ 0.289”

S ⇒

S ⇒ SMC

Tin/Lead

0 ⇒ 0.00”

(5.0 V)

N ⇒

Surface

Mount

Negative

Through hole

A ⇒ 0.319”

B ⇒ 0.352”

C ⇒ 0.516”

D ⇒ 0.416”

E ⇒ 0.298”

One-Eighth

Brick

over Nickel

Through hole

A ⇒ 0.188”

B ⇒ 0.145”

C ⇒ 0.110”

08 ⇒ 8 A

18-36 V

(6.0 V)

Format

T⇒

Through-

hole

T ⇒

Special

P ⇒

Positive

05 ⇒ 5.3 A

Trim²

(8.0 V)

(For 1.2V &

1.0V only)

04 ⇒ 4 A

(12.0 V)

1. The example above describes P/N SQ24T05080-NBA0: 18-36 V input, through-hole mounting, 5.3 A @ 8.0 V output, negative ON/OFF logic,

a maximum height of 0.352”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.

2. For definitions, operation, and associated trim equations for all trim options, please refer to Application Note 103, Trim Feature for Isolated

dc-dc converters.

^Fd^ori/^md^ot^r,^eaⁱⁿP^foo^rw^me^ar^ti-^oOⁿn^pe^lec^ao^sem^cp^oaⁿn^tay^ct

1822 Aston Avenue •• Carlsbad, CA •• 92008 •• USA

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www.didt.com •• support@didt.com

The information and specifications contained in this data sheet are believed to be accurate and reliable at the time of publication. However, Power-One, Inc. assumes no responsibility for its use

or for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Power-One,

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Page 70 of 70


型号：	SQ24T10050NDASG
厂家：	BEL FUSE INC.
描述：	1-OUTPUT DC-DC REG PWR SUPPLY MODULE 输出元件
文件：	总70页 (文件大小：1072K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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SQ24T10050NEAS

SQ24T10050NEASG

SQ24T10050NEB0

SQ24T10050NEB0G