SQM48S20012-NS0T [BEL]
DC-DC Regulated Power Supply Module, 1 Output, 24W, Hybrid, ONE-EIGHTH BRICK PACKAGE-8;
| 型号： | SQM48S20012-NS0T |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 24W, Hybrid, ONE-EIGHTH BRICK PACKAGE-8 |
| 文件： | 总33页 (文件大小：404K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Features
RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 20 A
Industry-standard, quarter-brick pinout
Outputs available in 3.3, 2.5, 2.0,1.8, 1.5, and 1.2 V
Available in through-hole and SM packages
Low profile: 0.28” (7.1 mm)
Low weight: 0.66 oz (18.5 g)
Onboard input differential LC-filter for the low input
ripple current
Start-up into pre-biased output
No minimum load required
Applications
Meets Basic insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed-frequency operation
Fully protected
Remote output sense
Telecommunications
Data communications
Wireless communications
Servers
Positive or negative logic ON/OFF option
Benefits
Output voltage trim range: +10%/−20% with
industry-standard trim equations
(except 1.2 V output)
High efficiency – no heat sink required
Higher current capability at elevated temperatures
High reliability: MTBF = 3.4 million hours,
than most competitors' 20-25 A quarter-bricks
calculated per Telcordia TR-332, Method I Case 1
Extremely small footprint: 0.896” x 2.30” (2.06 in2),
38% smaller than conventional quarter-bricks
UL60950 recognized in US and Canada and
DEMKO certified per IEC/EN60950
Designed to meet Class B conducted emissions per
FCC and EN55022 when used with external filter
All materials meet UL94, V-0 flammability rating
Description
The 20A SemiQ™ Family of DC-DC converters provide a high efficiency single output in a size that is only 60% of
industry-standard quarter bricks, while preserving the same pinout and functionality.
The 20A SQM48 Series converters of the SemiQ™ Family provide thermal performance in high temperature
environments that exceeds most competitors' 20-25 A quarter-bricks. This is accomplished through the use of
patent pending circuit, packaging and processing techniques to achieve ultra-high efficiency, excellent thermal
management, and a very low body profile.
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 advanced electronic circuits and
thermal design, results in a product with extremely high reliability.
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.
With a standard pinout and trim equations, the SQM48 Series 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 savings. The device is also available in a surface mount package.
In both cases the designer can expect reliability improvement over other available converters because of the
SQM48 Series’ optimized thermal efficiency.
MCD10208 Rev. 1.0, 08-Jul-10
Page 1 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Electrical Specifications (common for all versions)
Conditions: TA=25 ºC, 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
Continuous
0
80
85
VDC
°C
Operating Ambient Temperature
Storage Temperature
Input Characteristics
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
-40
-55
125
°C
36
48
75
VDC
Non-latching
100 ms
33
31
34
32
35
33
VDC
VDC
VDC
Turn-off Threshold
Input Voltage Transient
Isolation Characteristics
I/O Isolation
100
2000
10
VDC
pF
Isolation Capacitance
Isolation Resistance
160
415
MΩ
Feature Characteristics
Switching Frequency
kHz
%
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
Output Voltage Trim Range1
%
Remote Sense Compensation1
Output Over-Voltage Protection
%
Non-latching (3.3 – 1.5 V)
Non-latching (1.2 V)
117
124
122
132
100
3
127
140
%
%
Auto-Restart Period
Applies to all protection features
See Figs. F, G and H
ms
ms
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off (logic low)
Converter On (logic high)
ON/OFF Control (Negative Logic)
Converter Off (logic high)
Converter On (logic low)
-20
2.4
0.8
20
VDC
VDC
2.4
-20
20
VDC
VDC
0.8
Additional Notes:
1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim from all
sources should not exceed 10% of VOUT(NOM), in order to insure specified operation of overvoltage protection circuitry.
MCD10208 Rev. 1.0, 08-Jul-10
Page 2 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Operations
of 0.8 V. An external voltage source (±20 V
maximum) may be connected directly to the ON/OFF
input, in which case it must be capable of sourcing or
sinking up to 1 mA depending on the signal polarity.
See the Start-up Information section for system timing
waveforms associated with use of the ON/OFF pin.
Input and Output Impedance
These power converters have been designed to be
stable with no external capacitors when used in low
inductance input and output circuits.
Remote Sense (Pins 5 and 7)
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 addition of a 33 µF electrolytic capacitor with an
ESR < 1 across the input helps ensure stability of
the converter. In many applications, the user has to
use decoupling capacitance at the load. The power
converter will exhibit stable operation 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 converter 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
Vin (+)
ON/OFF
Vin (-)
Vout (+)
Converter
100
SENSE (+)
Additionally, see the EMC section of this data sheet
for discussion of other external components which
may be required for control of conducted emissions
(Top View)
Rload
TRIM
SENSE (-)
Vin
10
Vout (+)
ON/OFF (Pin 2)
Rw
The ON/OFF pin is used to turn the power converter
on or off remotely via a system signal. There are two
remote control options available, positive logic and
negative logic and both are referenced to Vin(-). A
typical connection is shown in Fig. A.
Fig. B: Remote sense circuit configuration.
If remote sensing is not utilized, 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 data sheet
value.
TM
Family
Q
Because the sense leads carry minimal current, large
traces on the end-user board are not required.
However, sense traces should be run side by side and
located close to a ground plane to minimize system
noise and insure optimum performance.
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
Rload
Vin
SENSE (-)
Vout (-)
When using the remote sense function, the
converter’s output overvoltage 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.
CONTROL
INPUT
Fig. A: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF
pin is at a logic high and turns off when at a logic low.
The converter is on when the ON/OFF pin is left
open. See table, page 2 for logic high/low definitions.
When utilizing the remote sense feature, care must be
taken not to exceed the maximum allowable output
power capability of the converter, equal to the product
of the nominal output voltage and the allowable output
current for the given conditions.
The negative logic version turns on when the pin is at
a logic low and turns off when the pin is at a 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 using remote sense, the output voltage at the
converter 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
The ON/OFF pin is internally pulled-up to 5V through
a resistor. A properly debounced 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 0.2mA at a low level voltage
MCD10208 Rev. 1.0, 08-Jul-10
Page 3 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
current (originally obtained from the derating curves)
511
R
TDECR
TDECR
10.22
15
[k] (3.3 – 1.5V)
[k] (1.2V)
by the same percentage to ensure the converter’s
actual output power remains at or below the
maximum allowable output power.
Δ
700
R
Δ
Output Voltage Adjust /TRIM (Pin 6)
where,
RTDECR Required value of trim-down resistor [k]
and Δ is defined above.
The output voltage can be adjusted up 10% or down
20% for Vout ≥ 1.5V, and ±10% for Vout = 1.2V
relative to the rated output voltage by the addition of
an externally connected resistor. For output voltage
3.3V, trim up to 10% is guaranteed only at Vin ≥ 40V,
and it is marginal (8% to 10%) at Vin = 36V
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 1.2V output).
The TRIM pin should be left open if trimming is not
being used. To minimize noise pickup, a 0.1µF
capacitor is connected internally between the TRIM
and SENSE(-) pins.
Converters with output voltages 1.2V is available with
alternative trim feature to provide the customers with
the flexibility of second sourcing. For these
converters, the last character in the part number is
“T”. The trim equations of “T” version of converters
and more information can be found in Application
Note 103.
To increase the output voltage, refer to Fig. C. A trim
resistor, RT-INCR, should be connected between the
TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of:
5.11(100 Δ)VONOM 626
TM
R
TINCR
10.22
[k],
Family
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
1.225Δ
(Top View)
for 3.3 – 1.5V.
Rload
Vin
84.6
RT-DECR
SENSE (-)
Vout (-)
R
TINCR
7.2
[k] (1.2V)
Δ
where,
RTINCR Required value of trim-up resistor k]
VONOM Nominal value of output voltage [V]
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 protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converter’s output pins and its
sense pins does not exceed 10% of VOUT(NOM), or:
(VO-REQ VO-NOM)
Δ
X 100 [%]
VO-NOM
VOREQ Desired (trimmed) output voltage [V].
TM
Family
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
[V]
[VOUT() VOUT()][VSENSE() VSENSE()] VO - NOMX10%
(Top View)
R T-INCR
This equation is applicable for any condition of output
sensing and/or output trim.
Rload
Vin
SENSE (-)
Vout (-)
Protection Features
Input Undervoltage Lockout
Fig. C: Configuration for increasing output voltage.
Input undervoltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined voltage.
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.
The input voltage must be typically 34 V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage drops
typically below 32 V. This feature is beneficial in
preventing deep discharging of batteries used in
telecom applications.
To decrease the output voltage (Fig. D), a trim
resistor, RT-DECR, should be connected between the
TRIM (Pin 6) and SENSE(-) (Pin 5), with a value of:
MCD10208 Rev. 1.0, 08-Jul-10
Page 4 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Output Protections
To comply with safety agencies requirements, an
input line fuse must be used external to the converter.
The Table below provides the recommended fuse
rating for use with this family of products.
All output circuit protection features are non-latching
and operate in a “hiccup” mode. After an output
protection event occurs, the converter will be turned
off, and held off for approximately 100 ms after
which, the protection circuit will reset and the
converter will attempt to restart. If the fault is still
present, the converter will repeat the above action.
Once the fault is removed, the converter will start
normally.
Output Voltage
Fuse Rating
3.3V
2.5 -1.8V
1.5 - 1.2V
4A
3A
2A
All SQM converters are UL approved for maximum
fuse rating of 15 A. To protect a group of converters
with a single fuse, the rating can be increased from
the recommended values above.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent or
short-circuit conditions. Upon sensing an overcurrent
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 characteristics of board mounted component dc-
dc converters exist. However, Power-One tests its
converters to several system level standards, primary
of which is the more stringent EN55022, Information
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.
technology
equipment
-
Radio
disturbance
characteristics - Limits and methods of measurement.
Effective internal LC differential filter significantly
reduces input reflected ripple current (Fig. x.9), and
improves EMC.
Once the output current is brought back into its
specified range, the converter automatically exits the
hiccup mode and continues normal operation.
With the addition of a simple external filter, all
versions of the SQM48 Series converters pass the
requirements of Class B conducted emissions per
EN55022 and FCC requirements. Please contact
Power-One Applications Engineering 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 reference, 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
Over-Temperature Protection (OTP)
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.
The converter will shut down under an over-
temperature condition to protect itself from
overheating caused by operation outside the thermal
derating curves, or operation in abnormal conditions
such as system fan failure. After the converter has
cooled to a safe operating temperature, it will
automatically restart.
The figures are numbered as Fig. x.y, where x
Safety Requirements
indicates the different output voltages, and
y
associates with specific plots (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.
The converters meet North American and
International safety regulatory requirements per
UL60950 and EN60950. Basic Insulation is provided
between input and output.
MCD10208 Rev. 1.0, 08-Jul-10
Page 5 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
The following pages contain specific plots or
waveforms associated with the converter. Additional
comments for specific data are provided below.
(i) The output current at which any FET junction
temperature does not exceed a maximum specified
temperature (120 °C) as indicated by the thermo-
graphic image, or
Test Conditions
(ii) The nominal rating of the converter (20 A on 3.3 –
1.2 V).
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 copper, were used to
provide traces for connectivity to the converter.
During normal operation, derating curves with
maximum FET temperature less or equal to 120 °C
should not be exceeded. Temperature on the PCB at
thermocouple location shown in Fig. E should not
exceed 120 °C in order to operate inside the derating
curves.
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 purposes.
Efficiency
Efficiency vs. load current plot is shown in Fig. x.2 for
ambient temperature of 25 ºC, airflow rate of 300 LFM
(1.5 m/s), vertical converter mounting, and input
voltages of 36 V, 48 V and 72 V.
All measurements requiring airflow were made in the
vertical and horizontal wind tunnel using Infrared (IR)
thermography and thermocouples for thermometry.
Ensuring components on the converter do not
exceed their ratings is important to maintaining high
reliability. If one anticipates operating the converter
at or close to the maximum loads specified in the
derating curves, it is prudent to check actual
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.
operating
temperatures
in
the
application.
Thermographic imaging is preferable; if this capability
is not available, then thermocouples may be used. It
is recommended the use of AWG #40 gauge
thermocouples to ensure measurement accuracy.
Careful routing of the thermocouple leads will further
minimize measurement error. Refer to Fig. E for
optimum measuring thermocouple locations.
Ripple and Noise
Fig. x.7 shows the output voltage ripple waveform,
measured 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 F ceramic capacitor.
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.
Fig. E: Locations of the thermocouples for thermal testing.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Fig. x.1 for through-hole version.
Ambient temperature 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.
For each set of conditions, the maximum load current
was defined as the lowest of:
MCD10208 Rev. 1.0, 08-Jul-10
Page 6 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
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 F.
ON/OFF
STATE
OFF
ON
Time
Comments
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 (converter turn-on delay).
t1
t2
t3
VOUT
Converter VOUT reaches 100% of nominal value.
t
t0
t1 t2
t3
For this example, the total converter start-up time (t3- t1) is
typically 3 ms.
Fig. F: Start-up scenario #1.
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via
ON/OFF pin. See Figure G.
VIN
Time
t0
t1
Comments
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled
(converter enabled).
ON/OFF
STATE
t2
t3
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
OFF
ON
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 enabled via ON/OFF pin. See Figure H.
Time
t0
Comments
t
t0
t1 t2
t3
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.
Fig. G: Start-up scenario #2.
t1
VIN
t2
ON/OFF pin is externally re-enabled.
If (t2- t1) ≤ 100 ms, external action of
ON/OFF pin is locked out by start-up inhibit
timer.
100 ms
ON/OFF
STATE
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 G.
End of converter turn-on delay.
OFF
ON
t3
t4
t5
VOUT
Converter VOUT reaches 100% of nominal value.
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. H: Start-up scenario #3.
MCD10208 Rev. 1.0, 08-Jul-10
Page 7 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Electrical Specifications: SQM48T/S20033 (3.3 Volt Out)
Conditions: TA=25 ºC, 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
3.267
3.250
3.300
3.333
VDC
±2
±2
±5
±5
3.350
mV
mV
VDC
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
30
50
20,000
20
27.5
44
mVPK-PK
μF
ADC
ADC
A
Plus full load (resistive)
0
21
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
Arms
Dynamic Response
Load Change 25% of Iout Max, di/dt = 0.1A/μs Co = 1 μF ceramic
80
mV
di/dt = 5A/μs Co = 450 μF POS + 1 μF ceramic
140
100
mV
µs
Settling Time to 1%
Efficiency
100% Load
50% Load
90
91
%
%
Additional Notes: 2. -40 ºC to 85 ºC.
25
20
0.95
0.90
0.85
0.80
0.75
0.70
0.65
15
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)
10
72 V
48 V
36 V
5
30 LFM (0.15 m/s)
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
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.
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
MCD10208 Rev. 1.0, 08-Jul-10
Page 8 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20033 (3.3 Volt Out)
Fig. 3.3V.3: Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal
(5V/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
(resistive) plus 10,000 F 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.5: Output voltage response to load current
step-change (5A – 10A – 5A ) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5A/div.). Current slew rate: 0.1 A/s. Co = 1 F
ceramic. Time scale: 0.2 ms/div.
Fig. 3.3V.6: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 5 A/s. Co = 450 F
tantalum + 1 F ceramic. Time scale: 0.2 ms/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 9 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20033 (3.3 Volt Out)
iS
iC
10 H
source
inductance
TM
33 F
ESR <1
electrolytic
capacitor
1 F
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Vout
Vsource
Fig. 3.3V.8: Test setup for measuring input reflected
ripple currents, ic and is.
Fig. 3.3V.7: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with Co = 10 F
tantalum + 1 uF ceramic and Vin = 48 V. Time scale:
1 s/div.
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 s/div.
Fig. 3.3V.10: Input reflected ripple current, is (10
mA/div.), measured through 10 H at the source at full
rated load current and Vin = 48 V. Refer to Fig. 3.3V.8
for test setup. Time scale: 1 s/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 10 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20033 (3.3 Volt 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.,
20ms/div.) into a 10 m short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 1ms/div.) is an
expansion of the on-time portion of the top trace.
Fig. 3.3V.11: Output voltage vs. load current showing
current limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
MCD10208 Rev. 1.0, 08-Jul-10
Page 11 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Electrical Specifications: SQM48T/S20025 (2.5 Volt Out)
Conditions: TA=25 ºC, 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
-40 ºC to 85 ºC
2.475
2.462
2.500
2.525
VDC
±2
±2
±5
±5
2.538
mV
mV
VDC
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
35
50
20,000
20
27.5
44
mVPK-PK
μF
ADC
ADC
A
Plus full load (resistive)
0
21
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
Arms
Dynamic Response
Load Change 25% of Iout Max, di/dt = 0.1A/μS Co = 1 μF ceramic
80
mV
di/dt = 5A/μS Co = 450 μF POS + 1 μF ceramic
140
100
mV
µs
Settling Time to 1%
Efficiency
100% Load
50% Load
88.5
90
%
%
Additional Notes: 2. -40 ºC to 85 ºC.
25
20
0.95
0.90
0.85
0.80
0.75
0.70
0.65
15
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)
10
72 V
48 V
36 V
5
30 LFM (0.15 m/s)
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
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.
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.
MCD10208 Rev. 1.0, 08-Jul-10
Page 12 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20025 (2.5 Volt Out)
Fig. 2.5V.4: Turn-on transient at full rated load current
(resistive) plus 10,000 F 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.3: Turn-on transient at full rated load current
(resistive) 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.6: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 5 A/s. Co = 450 F
tantalum + 1 F ceramic. Time scale: 0.2 ms/div.
Fig. 2.5V.5: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 0.1 A/s. Co = 1 F
ceramic. Time scale: 0.2 ms/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 13 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20025 (2.5 Volt Out)
iS
iC
10 H
source
inductance
TM
33 F
ESR <1
electrolytic
capacitor
1 F
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Vout
Vsource
Fig. 2.5V.8: Test setup 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 F
tantalum + 1uF ceramic and Vin = 48 V. Time scale:
1 s/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 s/div.
Fig. 2.5V.10: Input reflected ripple current, is (10
mA/div.), measured through 10 H at the source at full
rated load current and Vin = 48 V. Refer to Fig. 2.5V.8
for test setup. Time scale: 1 s/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 14 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20025 (2.5 Volt 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 m short circuit during restart, at Vin
= 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
expansion of the on-time portion of the top trace.
Fig. 2.5V.11: Output voltage vs. load current showing
current limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
MCD10208 Rev. 1.0, 08-Jul-10
Page 15 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Electrical Specifications: SQM48T/S20020 (2.0 Volt Out)
Conditions: TA=25 ºC, 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
25 MHz bandwidth
1.3
ADC
mADC
mADC
mAPK-PK
dB
3
32
6
120 Hz
TBD
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
Over Line
-40 ºC to 85 ºC
1.98
2.000
2.02
VDC
±2
±2
±5
±5
2.030
mV
mV
VDC
Over Load
Output Voltage Range
Output Ripple and Noise - 25 MHz
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
1.970
30
50
20,000
20
27.5
44
mVPK-PK
μF
ADC
ADC
A
Plus full load (resistive)
0
21
Non-latching
Non-latching. Short=10 mꢀ.
Non-latching
24
30
6.7
Arms
Dynamic Response
Load Change 25% of Iout Max, di/dt = 0.1A/μS Co = 1 μF ceramic
80
mV
di/dt = 5 A/μS Co = 450 μF POS + 1 μF ceramic
140
100
mV
µs
Settling Time to 1%
Efficiency
100% Load
50% Load
87
88.5
%
%
Additional Notes: 2. -40 ºC to 85 ºC.
25
20
0.95
0.90
0.85
0.80
0.75
0.70
0.65
15
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)
10
72 V
48 V
36 V
5
30 LFM (0.15 m/s)
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
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.
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.
MCD10208 Rev. 1.0, 08-Jul-10
Page 16 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20020 (2.0 Volt Out)
Fig. 2.0V.4: Turn-on transient at full rated load current
(resistive) plus 10,000 F 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.3: Turn-on transient at full rated load current
(resistive) 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.6: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 5 A/s. Co = 450 F
tantalum + 1 F ceramic. Time scale: 0.2 ms/div.
Fig. 2.0V.5: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5A/div.). Current slew rate: 0.1 A/s. Co = 1 F
ceramic. Time scale: 0.2 ms/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 17 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20020 (2.0 Volt Out)
iS
iC
10 H
source
inductance
TM
33 F
ESR <1
electrolytic
capacitor
1 F
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Vout
Vsource
Fig. 2.0V.8: Test setup for measuring input reflected
ripple currents, ic and is.
Fig. 2.0V.7: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with Co = 10 F
tantalum + 1 uF ceramic and Vin = 48 V. Time scale:
1 s/div.
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 s/div.
Fig. 2.0V.10: Input reflected ripple current, is (10
mA/div.), measured through 10 H at the source at full
rated load current and Vin = 48 V. Refer to Fig. 2.0V.8
for test setup. Time scale: 1 s/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 18 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20020 (2.0 Volt 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 m short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
expansion of the on-time portion of the top trace.
Fig. 2.0V.11: Output voltage vs. load current showing
current limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
MCD10208 Rev. 1.0, 08-Jul-10
Page 19 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Electrical Specifications: SQM48T/S20018 (1.8 Volt Out)
Conditions: TA=25 ºC, 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 = 48V, converter disabled
Vin = 48V, converter enabled
25 MHz bandwidth
1.2
ADC
mADC
mADC
mAPK-PK
dB
3
30
6
120 Hz
TBD
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
Over Line
-40 ºC to 85 ºC
1.782
1.773
1.800
1.818
VDC
±2
±2
±4
±5
1.827
mV
mV
VDC
Over Load
Output Voltage Range
Output Ripple and Noise - 25 MHz
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
30
50
20,000
20
27.5
44
mVPK-PK
μF
ADC
ADC
A
Plus full load (resistive)
0
21
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
Arms
Dynamic Response
Load Change 25% of Iout Max, di/dt = 0.1A/μs Co = 1 μF ceramic
80
mV
di/dt = 5A/μs Co = 450 μF POS + 1 μF ceramic
140
100
mV
µs
Settling Time to 1%
Efficiency
100% Load
50% Load
86
88
%
%
Additional Notes: 2. -40 ºC to 85 ºC.
25
20
0.95
0.90
0.85
0.80
0.75
0.70
0.65
15
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)
10
72 V
48 V
36 V
5
30 LFM (0.15 m/s)
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
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.
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.
MCD10208 Rev. 1.0, 08-Jul-10
Page 20 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20018 (1.8 Volt Out)
Fig. 1.8V.4: Turn-on transient at full rated load current
(resistive) plus 10,000 F 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.3: Turn-on transient at full rated load current
(resistive) 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 (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 5 A/s. Co = 450 F
tantalum + 1 F ceramic. Time scale: 0.2 ms/div.
Fig. 1.8V.5: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 0.1A/s. Co = 1 F
ceramic. Time scale: 0.2 ms/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 21 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20018 (1.8 Volt Out)
iS
iC
10 H
source
inductance
TM
33 F
ESR <1
electrolytic
capacitor
1 F
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Vout
Vsource
Fig. 1.8V.7: Output voltage ripple (20mV/div.) at full
rated load current into a resistive load with Co = 10 F
tantalum + 1 uF ceramic and Vin = 48 V. Time scale:
1 s/div.
Fig. 1.8V.8: Test setup for measuring input reflected
ripple currents, ic and is.
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 s/div.
Fig. 1.8V.10: Input reflected ripple current, is
(10 mA/div.), measured through 10 H at the source at
full rated load current and Vin = 48 V. Refer to Fig.
1.8V.8 for test setup. Time scale: 1 s/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 22 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20018 (1.8 Volt 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 m short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
expansion of the on-time portion of the top trace.
Fig. 1.8V.11: Output voltage vs. load current showing
current limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
MCD10208 Rev. 1.0, 08-Jul-10
Page 23 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Electrical Specifications: SQM48T/S20015 (1.5 Volt Out)
Conditions: TA=25 ºC, Airflow=300 LFM (1.5 m/s), Vin=48 VDC, Vout=1.5 VDC, unless otherwise specified.
Parameter
Input Characteristics
Notes
Min
Typ
Max
Units
20 ADC, 1.5 VDC Out @ 36 VDC
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
In
1.0
ADC
mADC
mADC
mAPK-PK
dB
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25 MHz bandwidth
3
27
6
120 Hz
TBD
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
Over Line
-40 ºC to 85 ºC
1.485
1.477
1.500
1.515
VDC
±2
±2
±4
±4
1.523
mV
mV
VDC
Over Load
Output Voltage Range
Output Ripple and Noise - 25 MHz
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
30
50
20,000
20
27.5
44
mVPK-PK
μF
ADC
ADC
A
Plus full load (resistive)
0
21
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
Arms
Dynamic Response
Load Change 25% of Iout Max, di/dt = 0.1A/μs Co = 1 μF ceramic
80
mV
di/dt = 5A/μs Co = 450 μF POS + 1 μF ceramic
140
100
mV
µs
Settling Time to 1%
Efficiency
100% Load
50% Load
84.5
86.5
%
%
Additional Notes: 2. -40ºC to 85ºC.
25
20
0.95
0.90
0.85
0.80
0.75
0.70
0.65
15
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)
10
72 V
48 V
36 V
5
30 LFM (0.15 m/s)
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
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.
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.
MCD10208 Rev. 1.0, 08-Jul-10
Page 24 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20015 (1.5 Volt Out)
Fig. 1.5V.3: Turn-on transient at full rated load current
(resistive) 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.4: Turn-on transient at full rated load current
(resistive) plus 10,000 F 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.5: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 0.1 A/s. Co = 1 F
ceramic. Time scale: 0.2 ms/div.
Fig. 1.5V.6: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 5 A/s. Co = 450 F
tantalum + 1 F ceramic. Time scale: 0.2 ms/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 25 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20015 (1.5 Volt Out)
iS
iC
10 H
source
inductance
TM
33 F
ESR <1
electrolytic
capacitor
1 F
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Vout
Vsource
Fig. 1.5V.7: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with Co = 10 F
tantalum + 1 uF ceramic and Vin = 48 V. Time scale:
1 s/div.
Fig. 1.5V.8: Test setup for measuring input reflected
ripple currents, ic and is.
Fig. 1.5V.10: Input reflected ripple current, is
(10 mA/div.), measured through 10 H at the source at
full rated load current and Vin = 48 V. Refer to Fig
1.5V.8 for test setup. Time scale: 1 s/div.
Fig. 1.5V.9: Input reflected ripple current, ic (100 A/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 s/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 26 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20015 (1.5 Volt Out)
2.0
1.5
1.0
0.5
0
0
5
10
15
20
25
30
Iout [Adc]
Fig. 1.5V.11: Output voltage vs. load current showing
current limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
Fig. 1.5V.12: Load current (top trace, 20 A/div.,
20 ms/div.) into a 10 m short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
expansion of the on-time portion of the top trace.
MCD10208 Rev. 1.0, 08-Jul-10
Page 27 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Electrical Specifications: SQM48T/S20012 (1.2 Volt Out)
Conditions: TA=25 ºC, 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
25 MHz bandwidth
0.85
ADC
mADC
mADC
mAPK-PK
dB
3
24
6
120 Hz
TBD
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
Over Line
-40 ºC to 85 ºC
1.188
1.182
1.200
1.212
VDC
±1
±1
±3
±3
1.218
mV
mV
VDC
Over Load
Output Voltage Range
Output Ripple and Noise - 25 MHz
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
30
50
20,000
20
27.5
44
mVPK-PK
μF
ADC
ADC
A
Plus full load (resistive)
0
21
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
24
30
6.7
Arms
Dynamic Response
Load Change 25% of Iout Max, di/dt = 0.1A/μs Co = 1 μF ceramic
80
mV
di/dt = 5A/μs Co = 450 μF POS + 1 μF ceramic
140
100
mV
µs
Settling Time to 1%
Efficiency
100% Load
50% Load
82.5
84.5
%
%
Additional Notes: 2. -40 ºC to 85 ºC.
25
20
0.95
0.90
0.85
0.80
0.75
0.70
0.65
15
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)
10
72 V
48 V
36 V
5
30 LFM (0.15 m/s)
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
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.
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.
MCD10208 Rev. 1.0, 08-Jul-10
Page 28 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20012 (1.2 Volt Out)
Fig. 1.2V.4: Turn-on transient at full rated load current
(resistive) plus 10,000 F 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.3: Turn-on transient at full rated load current
(resistive) 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.6: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 5 A/s. Co = 450 F
tantalum + 1 F ceramic. Time scale: 0.2 ms/div.
Fig. 1.2V.5: Output voltage response to load current
step-change (5A – 10A – 5A) at Vin = 48 V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current
(5 A/div.). Current slew rate: 0.1A/s. Co = 1 F
ceramic. Time scale: 0.2 ms/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 29 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20012 (1.2 Volt Out)
iS
iC
10 H
source
inductance
TM
33 F
ESR <1
electrolytic
capacitor
1 F
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Vout
Vsource
Fig. 1.2V.7: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with Co = 10 F
tantalum + 1 uF ceramic and Vin = 48 V. Time scale:
1 s/div.
Fig. 1.2V.8: Test setup for measuring input reflected
ripple currents, ic and is
Fig. 1.2V.9: Input reflected ripple current, ic
(100mA/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 s/div.
Fig. 1.2V.10: Input reflected ripple current, is
(10 mA/div.), measured through 10 H at the source at
full rated load current and Vin = 48 V. Refer to Fig.
1.2V.8 for test setup. Time scale: 1 s/div.
MCD10208 Rev. 1.0, 08-Jul-10
Page 30 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
SQM48T/S20012 (1.2 Volt Out)
1.5
1.0
0.5
0
30
0
5
10
15
20
25
Iout [Adc]
Fig. 1.2V.11: Output voltage vs. load current showing
current limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
Fig. 1.2V.16: Load current (top trace, 20 A/div., 50
ms/div.) into a 10 m short circuit during restart, at Vin
= 48 V. Bottom trace (20 A/div., 5 ms/div.) is an
expansion of the on-time portion of the top trace.
MCD10208 Rev. 1.0, 08-Jul-10
Page 31 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Physical Information
SQM48S Platform Notes
All dimensions are in inches [mm]
Connector Material: Copper
1
2
3
8
7
6
5
4
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]
TOP VIEW
SIDE VIEW
Pad/Pin Connections
Pad/Pin #
Function
1
2
3
4
5
6
7
8
Vin (+)
SQM48S Pinout (Surface Mount)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
1
2
3
8
7
6
5
4
TOP VIEW
SIDE VIEW
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]
HT
CL
PL
Pin
Height
Option
(Max. Height) (Min. Clearance)
Pin Length
+0.000 [+0.00]
-0.038 [- 0.97]
+0.016 [+0.41]
-0.000 [- 0.00]
Option
±0.005 [±0.13]
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
A
B
C
D
E
0.325 [8.26]
0.358 [9.09]
0.522 [13.26]
0.422 [10.72]
0.304 [7.72]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
0.09 [0.237]
MCD10208 Rev. 1.0, 08-Jul-10
Page 32 of 33
www.power-one.com
SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
Converter Part Numbering Ordering Information
Rated
Load
Current
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage
ON/OFF
Logic
Maximum
Height [HT]
Pin
Length [PL]
Special
Features
RoHS
SQM
48
S
20
018
-
N
B
A
0
No Suffix
RoHS
lead-solder-
exemption
compliant
0 STD
012 1.2V
015 1.5V
018 1.8V
020 2.0V
025 2.5V
033 3.3V
N
1/8th
Brick
Format
Negative
S
Surface
Mount
T
Alternative
Trim
Option
(For 1.2V)
SMT
S 0.295”
36-75 V
20A
SMT
0 0.00”
P
Positive
G RoHS
compliant
for all six
substances
Rated
Load
Current
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage
ON/OFF
Logic
Maximum
Height [HT]
Pin
Length [PL]
Special
Features
RoHS
SQM
48
T
20
018
-
N
B
A
0
No Suffix
RoHS
lead-solder-
exemption
compliant
0 STD
Through hole
A 0.325”
B 0.358”
C 0.522”
D 0.422”
E 0.304”
012 1.2V
015 1.5V
018 1.8V
020 2.0V
025 2.5V
033 3.3V
Through hole
A 0.188”
B 0.145”
C 0.110”
N
1/8th
Brick
Format
Negative
T
Through-
hole
T
Alternative
Trim
Option
(For 1.2V)
36-75 V
20A
P
Positive
G RoHS
compliant
for all six
substances
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”, a through the board pin length of 0.188”, and RoHS lead-solder-exemption compliancy.
Model numbers highlighted in yellow or shaded are not recommended for new designs.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written
consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
MCD10208 Rev. 1.0, 08-Jul-10
Page 33 of 33
www.power-one.com
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