unr-3.3-12-d5 Murata Manufacturing Co., Ltd, unr-3.3-12-d5 Datasheet - Page 3

• Manufacturer Part Number: unr-3.3-12-d5
• Description: Single Output, Non-isolated, 5v-to-2.5v 12 Amp, Dc/dc Converters
• Manufacturer: Murata Manufacturing Co., Ltd

www.murata-ps.com
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.
Features
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Low cost!
+4.75V to +5.5V input
+3.3V (±33mV), 12 Amp output
200kHz, synchronous-rectifier topology
High efficiency, 90%
Low output noise, 40mVp-p
Quick transient response, 30µsec
–40 to +50°C operation with no derating
Highly reliable, 100% SMT construction
Remote on/off control
Output short-circuit protection
1" x 2" metal package; EMC compliant
IEC950/EN60950/UL1950 pending
Modifications and customs for OEM’st
CONTROL
GROUND
RETURN
ON/OFF
LOGIC
INPUT
+V
IN
VOLTAGE
BOOST
the shortcomings of both traditional centralized power architectures and the recently
introduced 3.3V outputs on AC/DC converters become more apparent. The solution
is to locally derive 3.3V power from buses of higher voltage (5V, 12V, 48V, etc.).
"Point-of-use" power processing is the only way to guarantee the tight accuracy, low
noise, and quick transient response required by these new devices.
Power Solutions’ new UNR-3.3/12-D5. These non-isolated, 5V-to-3.3V DC/DC’s
deliver up to 12 Amps. Packaged in 1" x 2" x 0.44" metal cases, these converters
use synchronous rectification, planar magnetics, and 100% automatic SMT assem-
bly to bring you the most cost-effective 3.3V power.
–40 to +50°C without heat sinking or forced-air cooling. It is fully line (±0.1% max.)
and load (±0.5% max.) regulated and features a TTL-compatible on/off control.
These devices can withstand a sustained output short circuit and automatically
recover to rated accuracy.
power applications. When you need 12 Amps, the task becomes significantly more
challenging and time consuming. It’s time to consider the high efficiency, ease-of-
use, and overall cost effectiveness of Murata Power Solutions' UNR Series. Safety
agency approvals and full EMI characterizations are currently in progress.
+V
As 3.3V CPU’s, DSP’s and PLD’s proliferate and low-voltage currents increase,
If you are designing power-hungry 3.3V partitions or boards, consider Murata
The 90% efficient UNR-3.3/12-D5 delivers its full 40W output power from
Designing your own 3.3V step-down buck regulator may be practical for low-
CC
CONTROLLER
Figure 2. Simplified Schematic
PWM
3
Single Output, Non-Isolated, 5V-to-2.5V
OVERCURRENT
DETECTION
REFERENCE &
ERROR AMP
Technical enquiries email: [e-mail], tel:
12 Amp, DC/DC Converters
UNR SERIES
+V
OUTPUT
RETURN
V
TRIM
UNR30-40W.B01 Page 3 of 4
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