The SemiQ Series of dc-dc converters provides a high-
efficiency single output in a size that is only 60% of industry-
standard quarter-bricks, while preserving the same pinout and
functionality.
In high temperature environments, for output voltages ranging
from 3.3 V to 1.0 V, the thermal performance of SemiQ
converters exceeds that of most competitors' 20-25 A quarter-
bricks. This performance 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
RoHS lead-free solder and lead-solder-exempted products are
airflow shadowing, thus enhancing cooling for downstream
available
devices. The use of 100% automation for assembly, coupled with
Delivers up to 15A (50W)
advanced electronic circuits and thermal design, results in a
Industry-standard quarter-brick pinout
product with extremely high reliability.
Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0, 1.8, 1.5, 1.2,
Operating from a 36-75 V input, the SQ48 Series converters
and 1.0 V
provide any standard output voltage from 12 V down to 1.0 V.
Available in through-hole and SMT packages
Outputs can be trimmed from 20% to +10% of the nominal
Low profile: 0.258 (6.55 mm) output voltage ( 10% for output voltages 1.2 V and 1.0 V), thus
providing outstanding design flexibility.
Low weight: 0.53 oz (15 g)
On-board input differential LC-filter
With a standard pinout and trim equations, the SQ48 Series
Startup into pre-biased output converters are perfect drop-in replacements for existing quarter-
brick designs. Inclusion of this converter in new designs can
No minimum load required
result in significant board space and cost savings. In both cases
Meets Basic Insulation requirements
the designer can expect reliability improvement over other
Withstands 100 V input transient for 100 ms
available converters because of the SQ48 Series optimized
Fixed-frequency operation
thermal efficiency.
Fully protected
Remote output sense
Positive or negative logic ON/OFF option
Telecommunications
Output voltage trim range: +10%/20% with industry-standard
Data Communications
trim equations (except 1.2 V and 1.0 V outputs with trim range
Wireless Communications
10%)
Servers
Output voltage trim range: +10%/20% with industry-standard
trim equations (except 1.2 V and 1.0 V outputs with trim range
10%)
High efficiency no heat sink required
nd
Safety according to IEC/EN 60950-1 2 Edition and UL/CSA
For output voltages ranging from 3.3 to 1.0 V, 40% higher
nd
current capability at elevated temperatures than most
60950-1 2 Edition
competitors' 20-25A quarter-bricks
Designed to meet Class B conducted emissions per FCC and
2
EN55022 when used with external filter
Extremely small footprint: 0.896 x 2.30 (2.06 in ), 40%
All materials meet UL94, V-0 flammability rating smaller than conventional quarter-bricks
North America
+1-866.513.2839
Asia-Pacific
+86.755.29885888
Europe, Middle East
+353 61 225 977
tech.support@psbel.com
belpowersolutions.com
2015 Bel Power Solutions, inc. BCD.00637_AA
Conditions: T = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 F, unless otherwise specified.
A
PARAMETER Notes MIN TYP MAX UNITS
Absolute Maximum Ratings
Input Voltage Continuous 0 80 VDC
Operating Ambient Temperature -40 85 C
Storage Temperature -55 125 C
Input Characteristics
Operating Input Voltage Range
36 48 75 VDC
Input Undervoltage Lockout
Non-latching
Turn-on Threshold
33 34 35 VDC
Turn-off Threshold
31 32 33 VDC
Input Voltage Transient
100 ms 100 VDC
Isolation Characteristics
I/O Isolation 2000 VDC
Isolation Capacitance 1.0 - 3.3 V 160 pF
5.0 - 6.0 V 260 pF
8.0 - 12 V 230 pF
Isolation Resistance 10 M
Feature Characteristics
Switching Frequency 415 kHz
Industry-std. equations (1.5 - 12V)
-20 +10 %
1
Output Voltage Trim Range
Use trim equation on Page 4 (1.0 -1.2 V)
-10 +10 %
1
Remote Sense Compensation Percent of VOUT(NOM) +10 %
Output Overvoltage Protection Non-latching ( 1.5 12 V) 117 122 127 %
Non-latching (1.0 -1.2 V) 124 132 140 %
Auto-Restart Period Applies to all protection features 100 ms
Turn-On Time See Figures F, G and H 4 ms
ON/OFF Control (Positive Logic)
Converter Off (logic low) -20 0.8 VDC
Converter On (logic high) 2.4 20 VDC
ON/OFF Control (Negative Logic)
Converter Off (logic high) 2.4 20 VDC
Converter On (logic low) -20 0.8 VDC
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 V (NOM), in order to ensure specified operation of overvoltage protection circuitry.
OUT
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 F electrolytic capacitor with an ESR < 1 across the input
866.513.2839
tech.support@psbel.com
belpowersolutions.com
2015 Bel Power Solutions, inc. BCD.00637_AA