QM48 Series - 45A
Data Sheet
The QmaXTM Series of high current single output DC/DC
converters from di/dt sets new standards for thermal per-
formance and power density in the quarter brick package.
The 45A QM48 converters of the QmaXTM Series provide
thermal performance in high temperature environments that
is comparable to or exceeds the industry’s leading 50A half
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.
The QM48T45 converters have a power density of up to
145 W/in3, more than twice that of competitors’ 50A half
bricks. Over 2 square inches of board space can be saved
for every slot in which a 50A half brick is replaced with a
QM48T45 converter from di/dt.
QM48T45 Converters
Features
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Delivers up to 45 A (150 W)
Industry-standard quarter brick pinout
Higher current capability at 70ºC than most com-
petitors’ 50 A half bricks
Low body profile and the preclusion of heatsinks minimize
impedance to system airflow, thus enhancing cooling for
downstream devices. The use of 100% automation for as-
sembly, coupled with di/dt’s advanced electric and thermal
design, results in a product with extremely high reliability.
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On-board input differential LC-filter
Outputs available: 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 V
High efficiency – no heatsink required
Start up into pre-biased output
Operating from a 36-75 V input, the QmaXTM Series con-
verters provide any standard output voltage from 3.3 V down
to 1.0 V. Outputs can be trimmed from –20% to +10% of the
nominal output voltage (±10% for output voltages 1.2 V and
1.0 V), thus providing outstanding design flexibility.
No minimum load required
Lowest profile in industry: 0.31” [7.9 mm]
Lowest weight in industry: 1.1 oz [31.5 g] typical
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed frequency operation
Fully protected
Remote output sense
Applications
Output voltage trim range: +10%/−20% with Industry-
standard trim equations (except 1.2 V and 1.0 V out-
puts with trim range ±10%)
High reliability: MTBF of 2.6 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)
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Telecommunications
Data communications
Wireless
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Servers
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Meets conducted emissions requirements of FCC
Class B and EN 55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
QM48T45 Family DS Ver 3 03-27-03
USA Toll Free 866 WOW-didt
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