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 logic are demanding more 1.5V, 1.8V or 2.5V
If your DSP and CPLD corehere for more information.
Features
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3.0-3.6V input range; Non-isolated
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1.5V, 1.8V or 2.5V output @ 10A
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2" x 1" through-hole or SMT package
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Gull-wing leads for SMT package
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Full synchronous-rectifier topology
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300kHz switching; Planar magnetics
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High efficiency, to 89%
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Low noise, 80mVp-p
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Quick transient response, 25µsec
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VOUT user-trimmable from 1.28V to 3V
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–40 to +50/55°C ambient operation with
no derating
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Remote on/off control; Output
overcurrent detection
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IEC950/EN60950/UL1950 pending
EMC compliant
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
of low-voltage current right from your 3.3V supply. These non-isolated power
converters exploit full synchronous rectification, planar magnetics, and 100% automated 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 temperatures 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 regulators 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.
+VIN
+VOUT
INPUT
RETURN
LOGIC
GROUND
OUTPUT
RETURN
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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