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UNR Series
Single Output, Non-Isolated, 1.8/2.5/3.3V OUT 3.6-10W DC/DC Converters
OBSOLETE PRODUCT
PRODUCT OVERVIEW
Last time buy: 3 March 2014
Click here for more information. reality today.
Murata Power Solutions' 3.6-10W UNR Series UNR Series makes this power processing at the
consists of non-isolated, 5V-to-1.8V (2A), 5V-to- concluding point of use a practical
FEATURES
?
? Low cost! High reliability!
1"
? ? x 1" through-hole package or 1.01" x 1.01"
SMT package
?
?
?
?
?
?
? Gull-wing leads; Standard re?ow
? Complete; No external components
? Outputs: 1.8V/2A, 2.5V/2A, 3.3V/3A
? Inputs: 4.75-5.5V, 10.8-13.6V
? Guaranteed ef?ciencies 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
? Modi?cations and customs for OEM's
+V IN
INPUT
RETURN
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-re?ow processes.
The true bene?ts of distributed power will
ultimately be realized only when every low-voltage,
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
(100% fully automated SMT construction) 3.6-10W
?
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
ef?ciencies enable all models to deliver their fully
rated output power from –40 to +65/70°C (ambi-
ent) without heat sinking or forced-air cooling.
If you've already considered and rejected the
use of inef?cient, step-down, linear regulators,
take a look at one of these new switching buck
regulators. Their high ef?ciency, ease-of-use, long-
term reliability, and overall cost effectiveness will
impress you. Safety agency approvals are currently
in progress.
+V OUT
OUTPUT
RETURN
?
LOGIC
GROUND
CURRENT LIMITING
UNDERVOLTAGE
SHUTDOWN
& S.C. SHUTDOWN
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
? "D5" models do not have input undervoltage shutdown.
? "D5" models employ a more traditional buck-regulator design
Figure 1. Simpli?ed Schematic
in which this FET is replaced with a power Schottky diode.
　
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_UNR 3.6-10W.C01 Page 1 of 8
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