QD48 Dual Quarter Brick Family
DC-DC Converter Data Sheet
The new QD48 Family of dual output, 48 V input, DC-DC
converters from Power-One offers unprecedented per-
formance in a quarter brick package by providing two in-
dependently regulated high current outputs. This is ac-
complished by the use of patent pending circuit and pack-
aging techniques to achieve ultra-high efficiency, excellent
thermal performance and a very low body profile.
In telecommunications applications the QD48 converters
provide up to 15 A per channel simultaneously - 30 A total -
with thermal performance far exceeding existing dual quarter
bricks and comparable to dual half bricks.
QD48T Converter
Features
Unique to quarter bricks, the QD48 converters utilize inde-
pendent power trains and control functions for each output,
allowing very tight output voltage regulation and very low
channel interference. In some applications they can be used
to replace two single-output quarter bricks.
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RoHS lead-free solder and lead-solder-exempted
products are available
Two independently regulated outputs in any combina-
tion of voltages from 1.2 V to 5.0 V
Low body profile and the preclusion of heat sinks minimize
airflow shadowing, thus enhancing cooling for downstream
devices. The use of 100% surface-mount technologies for
assembly, coupled with Power-One’s advanced electric and
thermal circuitry and packaging, result in a product with ex-
tremely high reliability.
Simultaneously delivers 15 A per output from 1.2 V to
3.3 V; 10 A for 5 V output
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Minimal cross-channel interference
Can replace two single-output quarter bricks
High efficiency – no heatsink required
High reliability
The QD48 family provides any combination of standard volt-
ages from 5.0 V to 1.2 V in an industry standard seven-pin
package. Outputs can be trimmed from –10% to +10% of the
nominal output voltage, thus providing outstanding design
flexibility.
On-board differential input LC- filter
Start-up into pre-biased outputs
No minimum load required on either output
Available in through-hole and SM packages
Industry-standard pinout
The QD48 family is designed to be a drop-in replacement for
existing dual designs, and utilizes a common trim function for
both outputs. The converters are also available in a surface
mount package.
Industry-standard footprint: 1.45” x 2.30”
Low profile: 0.26” [6.6 mm]
Low weight: 1 oz [28 g] typical)
Inclusion of this new converter in new designs can result in a
significant reliability improvement over other available duals
because of its optimized thermal efficiency.
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Positive or negative logic ON/OFF referenced to input
Fixed-frequency operation
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Applications
Both outputs trimmed via common external trim resis-
tor, range: +10%/-10% of VNOM for both outputs
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Telecommunications
Data communications
Wireless
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UL 60950 recognized in US and Canada and DEMKO
certified per IEC/EN 60950
Meets FCC Class B and IEC/EN 55022 Class B con-
ducted requirements with external filter
Servers
MAY 08, 2003 revised to NOV 20, 2006
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