®
®
INNOVATION and EXCELLENCE
Single Output
UNR D3 Series
Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT
8 and 10 Amp DC/DC Converters
Features
■
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
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Full synchronous-rectifier topology
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300kHz switching; Planar magnetics
■
High efficiency, to 89%
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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
■
Remote on/off control; Output
overcurrent detection
■
IEC950/EN60950/UL1950 pending
■
EMC compliant
If your DSP and CPLD core logic are demanding more 1.5V, 1.8V or 2.5V
current from your 3.3V system, don’t pay to derive more isolated power from your
intermediate dc bus. DATEL’s 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 DATEL’s 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
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • Email: sales@datel.com • Internet: www.datel.com
