SQM48S20012-P00G [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid;
| 型号： | SQM48S20012-P00G |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid |
| 文件： | 总33页 (文件大小：575K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SQM48 Series - 20A
Data Sheet
The new 20A 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 preserv-
ing the same pinout and functionality.
The 20A SQM48 Series converters of the SemiQ™ Family
provide thermal performance in high temperature environ-
ments that exceeds most competitors' 20-25 A 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.
SQM48T and SQM48S Converters
Low body profile and the preclusion of heatsinks minimize
airflow shadowing, thus enhancing cooling for downstream
devices. The use of 100% automation for assembly, coupled
with di/dt’s advanced electrical and thermal design, results in
a product with extremely high reliability.
Features
•
•
•
Delivers up to 20 A (66 W)
Industry-standard quarter brick pinout
Extremely small footprint: 0.896” x 2.30” (2.06 in2),
40% smaller than conventional quarter bricks
Higher current capability at elevated temperatures
than most competitors' 20-25 A quarter bricks
On-board input differential LC-filter for the lowest
input ripple current in industry
Operating from a 36-75 V input, the 20A SQM48 Series
converters provide any standard output voltage from 3.3 V
down to 1.2 V. Outputs can be trimmed from –20% to +10%
of the nominal output voltage (±10% for output voltage 1.2
V), thus providing outstanding design flexibility.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Outputs available in 3.3, 2.5, 2.0, 1.8, 1.5, and 1.2 V
High efficiency – no heatsink required
Start up into pre-biased output
With a standard pinout and trim equations, the SQM48 Se-
ries converters are perfect drop-in replacements for existing
20 A quarter brick designs. Inclusion of this converter in new
designs can result in significant board space and cost sav-
ings. The device is also available in a surface mount pack-
age.
No minimum load required
Available in through-hole and SM packages
Lowest profile in industry: 0.28” (7.1 mm)
Lowest weight in industry: 0.66 oz (18.5 g)
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed frequency operation
In both cases the designer can expect reliability improve-
ment over other available converters because of the SQM48
Series’ optimized thermal efficiency.
Fully protected
Remote output sense
Output voltage trim range: +10%/−20% with Industry-
standard trim equations (except 1.2 V output)
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 recognized in US and Canada and DEMKO
certified per IEC/EN 60950 (pending)
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
•
•
SQM48x20 Family DS Ver 3 03-18-03
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SQM48 Series - 20A
Data Sheet
Electrical Specifications (common to all versions)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, All output voltages, unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
0
-40
-55
80
85
125
Vdc
°C
°C
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
36
48
75
Vdc
Non-latching
100 ms
33
31
34
32
35
33
100
Vdc
Vdc
Vdc
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
2000
10
Vdc
pF
MΩ
160
415
Isolation Resistance
FEATURE CHARACTERISTICS
Switching Frequency
kHz
%
%
Output Voltage Trim Range1
Industry-std. equations (3.3 – 1.5 V)
Use trim equation on Page 4 (1.2 V)
Percent of VOUT(NOM)
-20
-10
+10
+10
+10
127
140
Remote Sense Compensation1
Output Over-Voltage Protection
%
Non-latching (3.3 – 1.5 V)
Non-latching (1.2 V)
Applies to all protection features
117
124
122
132
100
3
%
%
ms
ms
Auto-Restart Period
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off
-20
2.4
0.8
20
Vdc
Vdc
Converter On
ON/OFF Control (Negative Logic)
Converter Off
2.4
-20
20
0.8
Vdc
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 VOUT(NOM), in order to insure specified operation of over-voltage protection circuitry.
SQM48x20 Family DS Ver 3 03-18-03
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SQM48 Series - 20A
Data Sheet
age of ≤ 0.8 V. An external voltage source, of ±20 V max.,
may be connected directly to the ON/OFF input, in which
case it should be capable of sourcing or sinking up to 1 mA
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.
Remote Sense (Pins 5 and 7)
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 33 µF electrolytic capacitor with an ESR < 1 Ω
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 20,000 µF on
3.3 – 1.2 V outputs.
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
Q
Semi
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
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
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-
ity of the converter, equal to the product of the nominal out-
put voltage and the allowable output current for the given
ON/OFF pin is internally pulled-up to 5 V through a resistor.
A mechanical switch, open collector transistor, or FET can
be used to drive the input of the ON/OFF pin. The device
must be capable of sinking up to 0.2 mA at a low level volt-
SQM48x20 Family DS Ver 3 03-18-03
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SQM48 Series - 20A
Data Sheet
conditions.
TM
Family
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
Converter
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.
SENSE (+)
TRIM
(Top View)
R T-INCR
Rload
Vin
SENSE (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
Output Voltage Adjust /TRIM (Pin 6)
To decrease the output voltage (Fig. D), a trim resistor,
T-DECR, should be connected between the TRIM (Pin 6) and
R
SENSE(-) (Pin 5), with a value of:
The output voltage can be adjusted up 10% or down 20% for
Vout ≥ 1.5 V, and ±10% for Vout = 1.2 V relative to the rated
output voltage by the addition of an externally connected
resistor. For output voltage 3.3 V, trim up to 10% is guaran-
teed only at Vin ≥ 40 V, and it is marginal (8% to 10%) at
Vin = 36 V.
511
R
T−DECR
=
=
−10.22 [kΩ] (3.3 – 1.5 V)
− 15 [kΩ] (1.2 V)
| ∆ |
700
RT−DECR
| ∆ |
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.
where,
RT−DECR = Required value of trim-down resistor [kΩ]
and ∆ is as defined above.
To increase the output voltage, refer to Fig. C. A trim resis-
tor, RT-INCR, should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of:
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter bricks and one-eighth bricks (except for
1.2 V output).
5.11(100 + ∆)VO−NOM − 626
R
T−INCR
=
=
− 10.22 [kΩ] (3.3 –1.5V)
1.225∆
84.6
R
T−INCR
− 7.2 [kΩ] (1.2 V)
Converters with output voltage 1.2 V are available with alter-
native trim feature to provide the customers with the flexibil-
ity of second sourcing. For these converters, the last charac-
ter in the part number is “T”. The trim equations of “T” ver-
sion of converters and more information can be found in Ap-
plication Note 103.
∆
where,
RT−INCR = Required value of trim-up resistor kΩ]
VO−NOM = Nominal value of output voltage [V]
(VO-REQ − VO-NOM)
TM
∆ =
X 100 [%]
Family
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
VO -NOM
(Top View)
Rload
VO−REQ = Desired (trimmed) output voltage [V].
Vin
RT-DECR
SENSE (-)
Vout (-)
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.
Fig. D: Configuration for decreasing output voltage.
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SQM48 Series - 20A
Data Sheet
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 VOUT(NOM),
or:
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.
[VOUT(+) − VOUT(−)]−[VSENSE(+) − VSENSE(−)] ≤ VO - NOM X10% [V]
Safety Requirements
This equation is applicable for any condition of output sens-
ing and/or output trim.
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950
(pending). Basic Insulation is provided between input and
output.
Protection Features
Input Under-Voltage Lockout
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.
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
3.3 V
Fuse Rating
4-A
The input voltage must be at least 35 V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops below 31 V. This feature is
beneficial in preventing deep discharging of batteries used in
telecom applications.
2.5 -1.8 V
1.5 - 1.2 V
3-A
2-A
Modules are UL approved for maximum fuse rating of 15-A.
To protect a group of modules with a single fuse, the rating
can be increased from the recommended values above.
Output Over-Current Protection (OCP)
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 40-50% of the nominal value of output
voltage, the converter will shut down (Fig. x.11).
Electromagnetic Compatibility (EMC)
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.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a typical 1-2% duty cycle (Fig.
x.12). The attempted restart will continue indefinitely until the
overload or short circuit conditions are removed or the output
voltage rises above 40-50% of its nominal value.
Effective internal LC differential filter significantly reduces
input reflected ripple current (Fig. x.9), and improves EMC.
Output Over-Voltage Protection (OVP)
With the addition of a simple external filter, all versions of the
SQM48 Series of converters pass the requirements of Class
B conducted emissions per EN55022 and FCC, and meet at
a minimum, Class A radiated emissions per EN 55022 and
Class B per FCC Title 47CFR, Part 15-J. Please contact
di/dt Applications Engineering for details of this testing.
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.
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SQM48 Series - 20A
Data Sheet
Thermal Derating
Characterization
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 2.5 m/s), and vertical converter
mounting.
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.
For each set of conditions, the maximum load current was
defined as the lowest of:
(i) The output current at which either any FET junction tem-
perature did not exceed a maximum specified temperature
(120°C) as indicated by the thermographic image, or
The figures are numbered as Fig. x.y, where x indicates the
different output voltages, and y is associated with specific
plots (y = 1 for the vertical thermal derating, …). For exam-
ple, Fig. x.1 will refer to the vertical thermal derating for all
the output voltages in general.
(ii) The nominal rating of the converter (20 A on 3.3 – 1.2 V).
During normal operation, derating curves with maximum FET
temperature less or equal to 120°C should not be exceeded.
Temperature on the PCB at the thermocouple location
shown in Fig. H should not exceed 118°C in order to operate
inside the derating curves.
The following pages contain specific plots or waveforms as-
sociated with the converter. Additional comments for specific
data are provided below.
Test Conditions
Efficiency
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.
Efficiency vs. load current plot is shown in Fig. x.2 for ambi-
ent temperature of 25ºC, airflow rate of 300 LFM (1.5 m/s),
vertical converter mounting, and input voltages of 36 V, 48 V
and 72 V.
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.
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.3 and Fig. x.4, respectively.
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.
Ripple and Noise
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.
Fig. x.7 shows the output voltage ripple waveform, measured
at full rated load current with a 10 µF tantalum and 1 µF ce-
ramic capacitor across the output. Note that all output volt-
age waveforms are measured across a 1 µF ceramic capaci-
tor.
The input reflected ripple current waveforms are obtained
using the test setup shown in Fig x.8. The corresponding
waveforms are shown in Fig. x.9 and Fig. x.10.
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SQM48 Series - 20A
Data Sheet
VIN
Start-up Information (using negative ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure E.
ON/OFF
STATE
Time
Comments
OFF
ON
t0
ON/OFF pin is ON; system front end power is toggled
on, VIN to converter begins to rise.
VIN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
Converter begins to respond to turn-on command (con-
verter turn-on delay).
Converter VOUT reaches 100% of nominal value.
t1
t2
t3
VOUT
For this example, the total converter start-up time (t3- t1) is typically
3 ms.
t
t0
t1 t2
t3
Fig. E: Start-up scenario #1.
VIN
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure F.
Time
t0
t1
Comments
VINPUT at 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 VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
3 ms.
VOUT
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously 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
VIN and VOUT are 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.
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.
100 ms
ON/OFF
STATE
OFF
ON
t3
t4
t5
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
VOUT
For the condition, (t2- t1) ≤ 100 ms, the total converter start-up
time (t5- t2) is typically 103 ms. For (t2- t1) > 100 ms, start-up will
be typically 3 ms after release of ON/OFF pin.
t
t0
t1
t2
t3 t4
t5
Fig. G: Start-up scenario #3.
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SQM48 Series - 20A
Data Sheet
Electrical Specifications: SQM48T/S20033 (3.3 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=3.3 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
20 Adc, 3.3 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
2.1
Adc
mAdc
mAdc
mAPK-PK
dB
3
45
6
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
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
3.267
3.250
3.300
3.333
Vdc
±2
±2
±5
±5
3.350
50
20,000
20
27.5
44
mV
mV
Vdc
mVPK-PK
µF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
30
0
22
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
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
100
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
90
91
%
%
Additional Notes: 2. -40ºC to 85ºC
25
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
10
72 V
48 V
36 V
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
5
0
20
30
40
50
60
70
80
90
0
5
10
15
20
25
Ambient Temperature [°C]
Load Current [Adc]
Fig. 3.3V.1: Available load current vs. ambient air temperature
and airflow rates for SQM48T20033 converter with D height
pins mounted vertically with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
Fig. 3.3V.2: Efficiency vs. load current and input voltage for
SQM48T/S20033 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20033 (3.3 Volts Out)
Fig. 3.3V.3: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, 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.4: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 48 V, 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.5: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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.
Fig. 3.3V.6: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20033 (3.3 Volts Out)
iS
iC
10 µH
source
inductance
TM
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Ω
Vout
Vsource
Fig. 3.3V.7: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 3.3V.8: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 3.3V.9: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 3.3V.8 for test setup. Time scale: 1 µs/div.
Fig. 3.3V.10: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 3.3V.8 for test setup. Time scale:
1µs/div.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20033 (3.3 Volts Out)
4.0
3.0
2.0
1.0
0
30
0
5
10
15
20
25
Iout [Adc]
Fig. 3.3V.12: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
Fig. 3.3V.11: 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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SQM48 Series - 20A
Data Sheet
Electrical Specifications: SQM48T/S20025 (2.5 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=2.5 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
20 Adc, 2.5 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
1.6
Adc
mAdc
mAdc
mAPK-PK
dB
3
35
6
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
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
2.475
2.462
2.500
2.525
Vdc
±2
±2
±5
±5
2.538
50
20,000
20
27.5
44
mV
mV
Vdc
mVPK-PK
µF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
30
0
22
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
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
100
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
88.5
90
%
%
Additional Notes: 2. -40ºC to 85ºC
25
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
10
72 V
48 V
36 V
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
5
0
20
30
40
50
60
70
80
90
0
5
10
15
20
25
Ambient Temperature [°C]
Load Current [Adc]
Fig. 2.5V.1: Available load current vs. ambient air temperature
and airflow rates for SQM48T20025 converter with D height
pins mounted vertically with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
Fig. 2.5V.2: Efficiency vs. load current and input voltage for
SQM48T/S20025 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20025 (2.5 Volts Out)
Fig. 2.5V.3: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, 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. 2.5V.4: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 48 V, 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. 2.5V.5: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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.
Fig. 2.5V.6: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20025 (2.5 Volts Out)
iS
iC
10 µH
source
inductance
TM
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Ω
Vout
Vsource
Fig. 2.5V.8: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 2.5V.7: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 2.5V.9: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 2.5V.8 for test setup. Time scale: 1 µs/div.
Fig. 2.5V.10: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 2.5V.8 for test setup. Time scale:
1µs/div.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20025 (2.5 Volts Out)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
5
10
15
20
25
30
Iout [Adc]
Fig. 2.5V.12: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
Fig. 2.5V.11: 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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SQM48 Series - 20A
Data Sheet
Electrical Specifications: SQM48T/S20020 (2.0 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=2.0 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
20 Adc, 2.0 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
1.3
Adc
mAdc
mAdc
mAPK-PK
dB
3
32
6
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
1.98
2.000
2.02
Vdc
Over Line
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
±2
±2
±5
±5
2.030
50
20,000
20
27.5
44
mV
mV
Vdc
mVPK-PK
µF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
1.970
30
0
22
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
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
100
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
87
88.5
%
%
Additional Notes: 2. -40ºC to 85ºC
25
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
10
72 V
48 V
36 V
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
5
0
20
30
40
50
60
70
80
90
0
5
10
15
20
25
Ambient Temperature [°C]
Load Current [Adc]
Fig. 2.0V.1: Available load current vs. ambient air temperature
and airflow rates for SQM48T20020 converter with D height
pins mounted vertically with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
Fig. 2.0V.2: Efficiency vs. load current and input voltage for
SQM48T/S20020 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20020 (2.0 Volts Out)
Fig. 2.0V.3: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, 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. 2.0V.4: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 48 V, 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. 2.0V.5: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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.
Fig. 2.0V.6: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20020 (2.0 Volts Out)
iS
iC
10 µH
source
inductance
TM
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Ω
Vout
Vsource
Fig. 2.0V.7: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 2.0V.8: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 2.0V.9: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 2.0V.8 for test setup. Time scale: 1 µs/div.
Fig. 2.0V.10: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 2.0V.8 for test setup. Time scale:
1µs/div.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20020 (2.0 Volts Out)
3.0
2.5
2.0
1.5
1.0
0.5
0
30
0
5
10
15
20
25
Iout [Adc]
Fig. 2.0V.12: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
Fig. 2.0V.11: 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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SQM48 Series - 20A
Data Sheet
Electrical Specifications: SQM48T/S20018 (1.8 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.8 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
20 Adc, 1.8 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
1.2
Adc
mAdc
mAdc
mAPK-PK
dB
3
30
6
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
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
1.782
1.773
1.800
1.818
Vdc
±2
±2
±4
±5
1.827
50
20,000
20
27.5
44
mV
mV
Vdc
mVPK-PK
µF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
30
0
22
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
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
100
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
86
88
%
%
Additional Notes: 2. -40ºC to 85ºC
25
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
10
72 V
48 V
36 V
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
5
0
20
30
40
50
60
70
80
90
0
5
10
15
20
25
Ambient Temperature [°C]
Load Current [Adc]
Fig. 1.8V.1: Available load current vs. ambient air temperature
and airflow rates for SQM48T20018 converter with D height
pins mounted vertically with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
Fig. 1.8V.2: Efficiency vs. load current and input voltage for
SQM48T/S20018 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20018 (1.8 Volts Out)
Fig. 1.8V.4: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 48 V, 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. 1.8V.3: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, 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. 1.8V.6: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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.5: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20018 (1.8 Volts Out)
iS
iC
10 µH
source
inductance
TM
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Ω
Vout
Vsource
Fig. 1.8V.8: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 1.8V.7: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 1.8V.10: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 1.8V.8 for test setup. Time scale:
1µs/div.
Fig. 1.8V.9: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 1.8V.8 for test setup. Time scale: 1 µs/div.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20018 (1.8 Volts Out)
2.0
1.5
1.0
0.5
0
0
5
10
15
20
25
30
Iout [Adc]
Fig. 1.8V.12: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
Fig. 1.8V.11: 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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SQM48 Series - 20A
Data Sheet
Electrical Specifications: SQM48T/S20015 (1.5 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.5 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
20 Adc, 1.5 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
1.0
Adc
mAdc
mAdc
mAPK-PK
dB
3
27
6
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
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
1.485
1.477
1.500
1.515
Vdc
±2
±2
±4
±4
1.523
50
20,000
20
27.5
44
mV
mV
Vdc
mVPK-PK
µF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
30
0
22
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
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
100
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
84.5
86.5
%
%
Additional Notes: 2. -40ºC to 85ºC
25
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
10
72 V
48 V
36 V
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
5
0
20
30
40
50
60
70
80
90
0
5
10
15
20
25
Ambient Temperature [°C]
Load Current [Adc]
Fig. 1.5V.1: Available load current vs. ambient air temperature
and airflow rates for SQM48T20015 converter with D height
pins mounted vertically with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
Fig. 1.5V.2: Efficiency vs. load current and input voltage for
SQM48T/S20015 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20015 (1.5 Volts Out)
Fig. 1.5V.4: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 2 ms/div.
Fig. 1.5V.3: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.). Time scale: 2 ms/div.
Fig. 1.5V.6: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. Top trace: output volt-
age (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.5: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20015 (1.5 Volts Out)
iS
iC
10 µH
source
inductance
TM
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Ω
Vout
Vsource
Fig. 1.5V.7: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 1.5V.8: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 1.5V.9: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 1.5V.8 for test setup. Time scale: 1 µs/div.
Fig. 1.5V.10: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig 1.5V.8 for test setup. Time scale:
1µs/div.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20015 (1.5 Volts Out)
2.0
1.5
1.0
0.5
0
0
5
10
15
20
25
30
Iout [Adc]
Fig. 1.5V.12: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
Fig. 1.5V.11: 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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SQM48 Series - 20A
Data Sheet
Electrical Specifications: SQM48T/S20012 (1.2 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.2 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
20 Adc, 1.2 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
0.85
Adc
mAdc
mAdc
mAPK-PK
dB
3
24
6
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
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
1.188
1.182
1.200
1.212
Vdc
±1
±1
±3
±3
1.218
50
20,000
20
27.5
44
mV
mV
Vdc
mVPK-PK
µF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
30
0
22
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
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
100
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
82.5
84.5
%
%
Additional Notes: 2. -40ºC to 85ºC
25
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
10
72 V
48 V
36 V
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
5
0
20
30
40
50
60
70
80
90
0
5
10
15
20
25
Ambient Temperature [°C]
Load Current [Adc]
Fig. 1.2V.1: Available load current vs. ambient air temperature
and airflow rates for SQM48T20012 converter with D height
pins mounted vertically with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
Fig. 1.2V.2: Efficiency vs. load current and input voltage for
SQM48T/S20012 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20012 (1.2 Volts Out)
Fig. 1.2V.3: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.). Time scale: 2 ms/div.
Fig. 1.2V.4: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 2 ms/div.
Fig. 1.2V.6: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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. 1.2V.5: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. 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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SQM48 Series - 20A
Data Sheet
SQM48T/S20012 (1.2 Volts Out)
iS
iC
10 µH
source
inductance
TM
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Ω
Vout
Vsource
Fig. 1.2V.7: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 1.2V.8: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 1.2V.9: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 1.2V.8 for test setup. Time scale: 1 µs/div.
Fig. 1.2V.10: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 1.2V.8 for test setup. Time scale:
1µs/div.
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SQM48 Series - 20A
Data Sheet
SQM48T/S20012 (1.2 Volts Out)
1.5
1.0
0.5
0
30
0
5
10
15
20
25
Iout [Adc]
Fig. 1.2V.12: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
Fig. 1.2V.11: 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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SQM48 Series - 20A
Physical Information
Data Sheet
SQM48S Platform Notes
•
•
•
•
•
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Converter Weight: 0.66 oz [18.5 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
SQM48S Pinout (Surface Mount)
HT
CL
(Max. Height)
(Min. Clearance)
Height
Option
+0.000 [+0.00]
-0.038 [- 0.97]
0.325 [8.26]
0.358 [9.09]
0.522 [13.26]
0.422 [10.72]
0.304 [7.72]
+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
TOP VIEW
SIDE VIEW
PL
Pin Length
Pin
Option
±0.005 [±0.13]
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
SQM48T 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
SQM48T Pinout (Through-hole)
•
•
•
•
Pin material: Brass
Pin Finish: Tin/Lead over Nickel
Converter Weight: 0.66 oz [18.5 g]
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SQM48 Series - 20A
Data Sheet
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Rated Load
Current
Output
Voltage
ON/OFF
Logic
Maximum
Height [HT]
Pin
Length [PL]
Special
Features
SQM
48
T
20
018
-
N
B
A
0
SMT
S ⇒ 0.295”
SMT
0 ⇒ 0.00”
S ⇒
Surface
Mount
0 ⇒ STD
012 ⇒ 1.2 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
020 ⇒ 2.0 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
N ⇒
Negative
Through hole
A ⇒ 0.325”
B ⇒ 0.358”
C ⇒ 0.522”
D ⇒ 0.422”
E ⇒ 0.304”
One-Eighth
Brick
20 A
(1.2 – 3.3 V)
T ⇒
Alternative
Trim
Option for
1.2V only
Through hole
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
36-75 V
Format
T⇒
Through-
hole
P ⇒
Positive
The example above describes P/N SQM48T20018-NBA0: 36-75 V input, through-hole mounting, 20 A @ 1.8 V output, negative ON/OFF logic, a
maximum height of 0.358”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.
Fig. H: Location of the thermocouple for thermal testing.
For more information please contact
di/dt, a Power-One company
1822 Aston Avenue •• Carlsbad, CA •• 92008 •• USA
USA Toll Free 866-WOW-didt (969-3438)
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, di/dt, 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 di/dt, Inc. Specifi-
cations are subject to change without notice.
©Copyright di/dt, Inc. 2003
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