LQN D12 Models
Non-Isolated, Single Output, 12Vin, 0.8-5Vo u t
45-50 Amp, ¼-Brick, DC/DC Converters
FEATURES
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3-phase buck regulators for new
distributed 12V power architectures
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12V input (10.2-13.8V range)
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0.8/1/1.2/1.5/1.8/2/2.5/3.3/5Vo u t
Typical unit
@45-50A
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Non-isolated, fixed-frequency,
synchronous-rectifier topology
PRODUCT OVERVIEW
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¼-brick size, through hole or SMT
The LQN D12 Series of non-isolated quarter bricks
high efficiency (95% for 5Vo u t models), low noise
(20mVp-p typ.), tight line/load regulation ( 0.25%
max.), quick step response (70µsec), stable no-load
operation, and no output reverse conduction.
The fully functional LQN's feature input over/
undervoltage lockout, output overvoltage and
overcurrent detection, continuous short-circuit
protection, overtemperature protection, an output-
voltage trim function, a remote on/off control pin,
and sense pin. High efficiency enables the LQN
D12s to deliver rated output currents of 50 Amps
at high ambient temperatures and minimal
air flow.
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1% setpoint accuracy
are ideal building blocks for emerging, on-board
power-distribution schemes in which isolated 12V
buses deliver power to any number of non-isolated,
step-down buck regulators. LQN D12 DC/DCs
accept a 12V input (10.2V to 13.8V input range) and
convert it, with the highest efficiency in the smallest
space, to a 0.8, 1, 1.2, 1.5, 1.8, 2, 2.5, 3.3 or 5 Volt
output fully rated at 45-50 Amps.
LQN D12s are ideal POLPPs (point-of-use/load
power processors) and they typically require no ex-
ternal components. They occupy the standard quarter
brick board space (1.45" x 2.3") and come in either
through-hole packages or surface-mount packages
with a profile of only 0.4" (0.5" including heatsink).
The LQNs best-in-class power density is
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Efficiencies to 93.5% @ 45 Amps
Noise as low as 20mVp-p
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Stable no-load operation
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On/Off control, trim & sense functions
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Output overvoltage protection
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Input Over/Undervoltage lockout
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Thermal shutdown
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Designed to meet UL/IEC/EN60950-1
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EMC compliant
If your new system boards call for multiple
supply voltages, check out the economics of
on-board 12V distributed power. If you don't need
to pay for multiple isolation barriers, MPS's non-
isolated LQN D12 brick's will save you money.
achieved with a fully synchronous, fixed-frequency,
3-phase buck topology that delivers extremely
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Typical topology is shown.
➀ Only one phase of three shown.
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
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