UNR SERIES
www.murata-ps.com
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Features
As supply voltages trend lower and load currents increase, centralized power
becomes more impractical. The tight accuracy, low noise and quick transient
response demanded by today’s low-voltage CPU’s, ASIC’s and DSP’s make power
processing at the "point of use" the only viable solution. As voltages decrease much
below 3.3V, the task of designing your own circuit to efficiently derive low-voltage
power from higher-voltage buses (5V, 12V, 48V, etc.) becomes significantly more
challenging.
When you are designing power-hungry 2.5V partitions or boards, consider
Murata Power Solutions’ new UNR-2.5/12-D5. This non-isolated, 5V-to-2.5V DC/
DC delivers a full 12 Amps at an impressive 87% efficiency. Packaged in a 1" x 2" x
0.44" metal case, the converter exploits synchronous rectification, planar magnetics
and 100% automatic SMT assembly to bring you an incomparable 30 Watts of 2.5V
power.
The UNR-2.5/12-D5 delivers full power over the –40 to +50°C temperature
range without heat sinking or forced-air cooling. It is fully line (±0.1%) and load
(±0.5%) regulated and features low noise (40mVp-p) and quick (30µsec) transient
response. The unit offers remote on/off control, and it can withstand a sustained
output short circuit with full recovery to rated accuracy.
Designing your own 2.5V step-down buck regulator may be practical for lowpower applications. When you need 12 Amps, the task becomes significantly more
time consuming. Consider that the high efficiency, ease-of-use, and overall cost
effectiveness of Murata Power Solutions’ new 2.5V UNR Series make the quick
solution the best solution.
OBSOLETE PRODUCT
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Low cost!
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+4.75V to +5.5V input
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+2.5V (±25mV), 12 Amp output
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200kHz, synchronous-rectifier topology
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High efficiency, 87%
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Low output noise, 40mVp-p
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Quick transient response, 30µsec
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–40 to +50°C operation with no derating
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Highly reliable, 100% SMT construction
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Remote on/off control
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Output short-circuit protection
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1" x 2" metal package; EMC compliant
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IEC950/EN60950/UL1950 pending
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Modifications and customs for OEM’s
Last time buy: 3 March 2014
Click here for more information.
+VIN
+VOUT
INPUT
RETURN
OUTPUT
RETURN
LOGIC
GROUND
OVERCURRENT
DETECTION
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
Signals applied to the On/Off Control are referenced to Logic Ground
which is internally connected to Input/Output Return. The Logic
Ground pin is not designed to carry heavy current. Do not install units
with the Return pins open or connected via high-impedance runs.
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
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