SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Features
RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 30 A
Industry-standard quarter-brick pinout
Outputs available: 3.3, 2.5, 1.8, 1.5, and 1.2 VDC
On-board input differential LC-filter
Start-up into pre-biased load
No minimum load required
Weight: 0.72 oz [20.6 g]
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed-frequency operation
Fully protected
Remote output sense
Positive or negative logic ON/OFF option
Latching and non-latching protection available
Output voltage trim range: +10%/−20% with
industry-standard trim equations (except 1.2 Vout)
High reliability: MTBF = 15.75 million hours,
calculated per Telcordia TR-332, Method
I
Case 1
UL60950 recognized in US and Canada and 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
Applications
Telecommunications
Data communications
Wireless communications
Servers, workstations
Benefits
High efficiency – no heat sink required
Higher current capability at elevated temperatures
than competitors’ 30 A quarter-bricks
Industry standard 1/8
th
brick footprint: 0.896” x
2.30” (2.06 in
2
), 38% smaller than conventional
quarter-bricks
Description
The high temperature 30A SQE48 Series of DC-DC converters provides a high efficiency single output, in a 1/8
th
brick package that is only 62% the size of the industry-standard quarter-brick. Specifically designed for operation
in systems that have limited airflow and increased ambient temperatures, the SQE48T30 converters utilize the
same pinout and functionality of the industry-standard quarter-bricks.
The 30 A SQE48 Series converters provide thermal performance in high temperature environments that exceeds
most competitors' 30A quarter-bricks. This performance is accomplished through the use of patented/patent-
pending circuits, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal
management, and a low-body profile.
Low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling
for both upstream and 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 SQE48T30 converters provide any standard output voltage from 3.3 V down
to 1.2 V that 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 standard pinout and trim equations, the SQE48 Series converters are perfect drop-in replacements for
existing 30 A quarter-brick designs. Inclusion of this converter in a new design can result in significant board space
and cost savings. The designer can expect reliability improvement over other available converters because of the
SQE48 Series’ optimized thermal efficiency.
ZD-01961 Rev. 2.0, 05-Feb-10
www.power-one.com
Page 1 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Electrical Specifications
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µF, unless otherwise specified.
Parameter
Absolute Maximum Ratings
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
Notes
Min
0
-40
-55
2250
Typ
Max
80
85
125
Units
VDC
°C
°C
VDC
Isolation Characteristics
I/O Isolation
Isolation Capacitance
Isolation Resistance
10
440
Industry-std. equations (3.3 - 1.5 V)
Use trim equation on Page 6 (1.2 V)
1
200
pF
MΩ
kHz
+10
+10
+10
%
%
%
%
%
°C
ADC
µs
30
mADC
ms
ms
0.8
20
20
0.8
VDC
VDC
VDC
VDC
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
1
Remote Sense Compensation
-20
-10
117
122
122
128
125
1
50
10
200
3
-20
2.4
2.4
-20
Percent of V
OUT
(
NOM
)
Latching or Non-latching (3.3 - 1.8 V)
Latching or Non-latching (1.5 - 1.2 V)
Non-latching
Peak amplitude
Peak duration
Converter Off;
external voltage 5 VDC
Applies to all protection features
See Figs. E, F, and G
Output Overvoltage Protection
Overtemperature Shutdown (PCB)
Peak Back-drive Output Current
(Sinking current from external source)
during startup into pre-biased output
Back-drive Output Current (Sinking Current
from external source)
Auto-Restart Period
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)
130
140
Additional Notes:
1
Vout can be increased up to 10% via the sense leads or 10% via the trim function. However, the total output voltage trim from all sources
should not exceed 10% of V
OUT
(
NOM
), in order to ensure specified operation of overvoltage protection circuitry.
ZD-01961 Rev. 2.0, 05-Feb-10
www.power-one.com
Page 2 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Electrical Specifications (continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µF, unless otherwise specified.
Parameter
Input Characteristics
Operating Input Voltage Range
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
Maximum Input Current
100 ms
Notes
Min
36
33
31
Typ
48
34
32
Max
75
35
33
100
3.1
2.4
1.7
1.5
1.2
Units
VDC
VDC
VDC
VDC
ADC
ADC
ADC
ADC
ADC
mA
mA
mA
mA
mA
mA
mA
PK-PK
mA
PK-PK
mA
PK-PK
mA
PK-PK
mA
PK-PK
dB
dB
dB
dB
dB
30 ADC Out @ 36 VDC In
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
Input Stand-by Current
Input No Load Current (0 load on the output)
Vin = 48V, converter disabled
Vin = 48V, converter enabled
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
2
42
34
30
28
27
8
6
6
6
6
91
60
70
65
65
Input Reflected-Ripple Current,
i
s
Vin = 48V, 25 MHz bandwidth
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
Input Voltage Ripple Rejection
120 Hz
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
ZD-01961 Rev. 2.0, 05-Feb-10
www.power-one.com
Page 3 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Electrical Specifications (continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µF, unless otherwise specified.
Parameter
Output Characteristics
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Output Voltage Set Point (no load)
Output Regulation Over Line
Over Line
Over Load
2
Notes
Plus full load (resistive)
Min
Typ
Max
30,000
Units
µF
ADC
ADC
A
Arms
%Vout
mV
mV
%Vout
mV
PK-PK
mV
PK-PK
mV
PK-PK
mV
PK-PK
mV
PK-PK
0
Non-latching
Non-latching, Short = 10 mΩ
Non-latching
-1
±2
±2
2
30
36.5
6
42
46
8
+1
±5
±5
+1.5
40
35
30
25
20
75
60
50
45
40
31.5
Over line, load and temperature
Output Ripple and Noise – 25 MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
Output Voltage Range
-1.5
Dynamic Response
Load Change 10A-20A-10A
di/dt = 0.1 A/μs
di/dt = 5 A/μs
Settling Time to 1% of Vout
Co = 1 µF ceramic (Fig. 3.3V.9)
Co = 470 µF POS + 1 µF ceramic
30
3
150
15
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
50% Load
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
Additional Notes:
2
Operating ambient temperature range of -40 ºC to 85 ºC for converter.
3
See waveforms for dynamic response and settling time for different output voltages.
mV
mV
µs
%
%
%
%
%
%
%
%
%
%
Efficiency
100% Load
90.5
89.0
86.5
85.0
83.0
92.0
90.5
88.5
87.0
85.0
ZD-01961 Rev. 2.0, 05-Feb-10
www.power-one.com
Page 4 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Operations
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.
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
Ω
across the input helps to 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 30,000 µF on
3.3 to 1.2 V outputs.
Additionally, see the EMC section of this data sheet
for discussion of other external components which
may be required for control of conducted emissions.
ON/OFF (Pin 2)
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 and
negative logic, with both referenced to Vin(-). A
typical connection is shown in Fig. A.
SQE48 Converter
(Top View)
Vin
ON/OFF
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 Startup Information
section for system timing waveforms associated with
use of the ON/OFF pin.
Remote Sense (Pins 5 and 7)
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).
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
100
Rw
SENSE (+)
Vin
ON/OFF
TRIM
SENSE (-)
10
Rload
Vin (-)
Vout (-)
Rw
Fig. B: Remote sense circuit configuration.
CAUTION
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.
Vin (+)
Vout (+)
SENSE (+)
TRIM
SENSE (-)
Rload
Vin (-)
CONTROL
INPUT
Vout (-)
Fig. A: Circuit configuration for ON/OFF function.
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 ensure optimum performance.
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.
When utilizing the remote sense feature, care must
be taken not to exceed the maximum allowable
output power capability of the converter, which is
equal to the product of the nominal output voltage
and the allowable output current for the given
conditions.
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
Page 5 of 29
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 the Electrical Specifications for logic
high/low definitions.
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.
The ON/OFF pin is internally pulled up to 5 V
through a resistor. A properly de-bounced
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 voltage of
0.8 V. An external voltage
ZD-01961 Rev. 2.0, 05-Feb-10
www.power-one.com
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