UNR D3 SERIES
www.murata-ps.com
Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT
8 and 10 Amp DC/DC Converters
OBSOLETE PRODUCT
Last time buy: 3 March 2014
Click here for more information.
If your DSP and CPLD core logic are demanding more 1.5V, 1.8V or 2.5V
Features
current from your 3.3V system, don’t pay to derive more isolated power from your
intermediate dc bus. Murata Power Solutions’ new, 3.3V-input, UNR "D3" models
derive 10 Amps
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3.0-3.6V input range; Non-isolated
1.5V, 1.8V or 2.5V output @ 10A
2" x 1" through-hole or SMT package
Gull-wing leads for SMT package
Full synchronous-rectifier topology
300kHz switching; Planar magnetics
High efficiency, to 89%
of low-voltage current right from your 3.3V supply. These non-isolated power
converters exploit full synchronous rectification, planar magnetics, and 100% auto-
mated assembly to deliver high efficiencies (to 89%), low noise (typically 80mVp-p),
and low costs. Housed in 1" x 2" shielded metal cases, UNR D3’s offer standard
through-hole ("T" models) or SMT ("SM" models) packaging.
The new "gull-wing" SMT packages (with metal shells and non-conductive
plastic baseplates) weigh less than 40 grams and can withstand peak lead tem-
peratures up to +300°C.
These versatile DC/DC’s are fully line ( 0.1% max.) and load ( 0.5% max.)
regulated. They feature quick transient response (25µsec), user-optional on/off
control (for power sequencing), and output overcurrent detection and shutdown
("hiccup" technique with auto-recovery). Their impressive guaranteed efficiencies
enable them to deliver fully rated output power from –40 to +50/55°C (ambient)
without supplemental cooling.
If your high current requirements have made the use of inefficient linear regula-
tors impractical, take a look at one of Murata Power Solutions’ new switching buck
regulators. Their high efficiency, ease-of-use, long-term reliability, and overall cost
effectiveness will impress you. Safety agency approvals and EMC characterizations
are currently in progress.
Low noise, 80mVp-p
Quick transient response, 25µsec
VOUT user-trimmable from 1.28V to 3V
–40 to +50/55°C ambient operation with
no derating
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Remote on/off control; Output
overcurrent detection
IEC950/EN60950/UL1950 pending
EMC compliant
+VIN
+VOUT
INPUT
RETURN
OUTPUT
RETURN
LOGIC
GROUND
VOLTAGE
BOOST
OVERCURRENT
DETECTION
+VCC
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
VOUT
TRIM
Figure 1. Simplified Schematic
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
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