UNR-1.8/2-D12SM データシートの表示（PDF） - Murata Power Solutions
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UNR-1.8/2-D12SM Datasheet PDF : 8 Pages
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www.murata-ps.com
UNR Series
Single Output, Non-Isolated, 1.8/2.5/3.3VOUT 3.6-10W DC/DC Converters
FEATURES
Low cost! High reliability!
1" x 1" through-hole package or 1.01" x 1.01"
SMT package
Gull-wing leads; Standard reflow
Complete; No external components
Outputs: 1.8V/2A, 2.5V/2A, 3.3V/3A
Inputs: 4.75-5.5V, 10.8-13.6V
Guaranteed efficiencies to 87%
Output noise as low as 40mVp-p
Transient response as quick as 20µsec
–40 to +70°C operation with no derating
On/off control; EMC compliant
IEC950/EN60950/UL1950 approvals
Modifications and customs for OEM's
OBSOLETE PRODUCT
PRODUCT OVERVIEW Last time buy: 3 March 2014
Click here for more information. Murata Power Solutions' 3.6-10W UNR Series
consists of non-isolated, 5V-to-1.8V (2A), 5V-to-
UNR Series makes this power processing at the
concluding point of use a practical reality today.
2.5V (2A), 5V-to-3.3V (3A), and 12V-to-3.3V (3A)
DC/DC converters in miniature surface-mount
and through-hole packages. The "gull-wing" SMT
packages (with metal shells and non-conductive
plastic baseplates) weigh a mere 17 grams and
can withstand lead temperatures up to +230°C.
They are compatible with virtually all contemporary
pick-and-place and solder-reflow processes.
These versatile DC/DC's are fully line and load
regulated. They feature user-optional on/off control
(for power-sequencing requirements), output cur-
rent limiting, and short-circuit protection (foldback
technique with auto-recovery). Additionally, the
12V-to-3.3V models offer input undervoltage
lockout (at 9.6V). Their impressive guaranteed
efficiencies enable all models to deliver their fully
The true benefits of distributed power will
rated output power from –40 to +65/70°C (ambi-
ultimately be realized only when every low-voltage, ent) without heat sinking or forced-air cooling.
high-current CPLD, ASIC, DSP, etc. has its own
"power plant" right next to it. With isolated DC/
DC converters inevitably residing at the edges of
boards in proximity with backplanes and power
buses, the "on-board" proliferation of distributed
power will continue with more cost-effective,
non-isolated devices. The low-cost, easy-to-use
(no external components required), highly reliable
If you've already considered and rejected the
use of inefficient, step-down, linear regulators,
take a look at one of these new switching buck
regulators. Their high efficiency, ease-of-use, long-
term reliability, and overall cost effectiveness will
impress you. Safety agency approvals are currently
in progress.
(100% fully automated SMT construction) 3.6-10W
+VIN
INPUT
RETURN
LOGIC
GROUND
ON/OFF
CONTROL
➀
UNDERVOLTAGE
SHUTDOWN
For full details go to
www.murata-ps.com/rohs
+VOUT
➁
OUTPUT
RETURN
CURRENT LIMITING
& S.C. SHUTDOWN
PWM
CONTROLLER
REFERENCE &
ERROR AMP
Figure 1. Simplified Schematic
Typical topology is shown.
➀ "D5" models do not have input undervoltage shutdown.
➁ "D5" models employ a more traditional buck-regulator design
in which this FET is replaced with a power Schottky diode.
www.murata-ps.com/support
MDC_UNR 3.6-10W.C01 Page 1 of 8
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