PRELIMINARY
廬
廬
INNOVATION and EXCELLENCE
Single Output
UNR D3 Series
Non-Isolated, 3.3V-to-2.5V or 1.8V
10A DC/DC鈥檚 in Standard or SMT Packaging
Features
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3.0-3.6V input range
Non-isolated, 2.5V or 1.8V output @ 10A
2" x 1" through-hole or SMT package
Gull-wing leads/standard re鏗俹w for SMT
Full synchronous-recti鏗乪r topology
300kHz switching; Planar magnetics
High ef鏗乧iency, to 89%
Low noise, 80mVp-p
Quick transient response, 25碌sec
V
OUT
user-trimmable from 1.28V to 3V
鈥?0 to +50/55擄C ambient operation with
no derating
Remote on/off control; Output
overcurrent detection
IEC950/EN60950/UL1950 pending
EMC compliant
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If your DSP and CPLD core logic are demanding more 2.5V or 1.8V current from
your 3.3V system, don鈥檛 pay to derive more isolated power from your intermediate
dc bus. DATEL鈥檚 new, 3.3V-input, UNR "D3" models derive 10A of 2.5V or 1.8V
current right from your 3.3V supply. These non-isolated power converters exploit
full synchronous recti鏗乧ation, planar magnetics, and 100% automated assembly to
deliver high ef鏗乧iencies (to 89%), low noise (typically 80mVp-p), and low costs.
Housed in 1" x 2" shielded metal cases, UNR D3鈥檚 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 temperatures
up to +235擄C. They are compatible with most contemporary pick-and-place and
solder-re鏗俹w processes.
These versatile DC/DC鈥檚 are fully line (鹵0.1% max.) and load (鹵0.5% max.)
regulated. They feature quick transient response (25碌sec), user-optional on/off
control (for power sequencing), and output overcurrent detection and shutdown
("hiccup" technique with auto-recovery). Their impressive guaranteed ef鏗乧iencies
enable them to deliver fully rated output power from 鈥?0 to +50/55擄C (ambient)
without supplemental cooling.
If your high current requirements have made the use of inef鏗乧ient linear regula-
tors impractical, take a look at one of DATEL鈥檚 new switching buck regulators. Their
high ef鏗乧iency, ease-of-use, long-term reliability, and overall cost effectiveness will
impress you. Safety agency approvals and EMC characterizations are currently in
progress.
+V
IN
+V
OUT
INPUT
RETURN
OUTPUT
RETURN
LOGIC
GROUND
VOLTAGE
BOOST
+V
CC
OVERCURRENT
DETECTION
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
V
OUT
TRIM
Figure 1. Simpli鏗乪d Schematic
DATEL, Inc., Mans鏗乪ld, MA 02048 (USA)
鈥?/div>
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
鈥?/div>
Email: sales@datel.com
鈥?/div>
Internet: www.datel.com
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