QM48T45 Family DC-DC Converter Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 45 A Output
Features
• RoHS lead-free solder and lead-solder-exempted
products are available
• Delivers up to 45 A (150 W)
• Industry-standard quarter-brick pinout
• On-board input differential LC-filter
• Outputs available: 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 V
• Start-up into pre-biased load
• No minimum load required
• Low profile: 0.31” [7.9 mm]
• Low weight: 1.1 oz [31.5 g]
Applications
• Meets Basic Insulation requirements of EN60950
• Withstands 100 V input transient for 100 ms
• Fixed-frequency operation
• Remote output sense
• Fully protected with automatic recovery
• Positive or negative logic ON/OFF option
• Telecommunications
• Data communications
• Wireless communications
• Servers, workstations
• Output voltage trim range: +10%/−20% with
industry-standard trim equations (except 1.2 V and
1.0 V outputs with trim range ±10%)
Benefits
• High efficiency – no heat sink required
• High reliability: MTBF = 2.6 million hours, calculated
per Telcordia TR-332, Method I Case 1
• Higher current capability at 70 ºC than most
competitors’ 50 A half-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 QmaXTM Series of high current single output dc-dc converters set new standards for thermal performance and
power density in the quarter-brick package.
The 45 A QM48 converters of the QmaXTM Series provide outstanding thermal performance in high temperature
environments that is comparable to or exceeds the industry’s leading 50 A half-bricks. This performance is
accomplished through the use of patented/patent-pending circuit, packaging, and processing techniques to
achieve ultra-high efficiency, excellent thermal management, and a very low-body profile.
The 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 QmaXTM Series converters 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.
MCD10073 Rev. 1.0
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