UNR-1.8/2-D5SM 데이터 시트보기 (PDF) - DATEL Data Acquisition products

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UNR-1.8/2-D5SM

Surface-Mount, Non-Isolated 1.8/2.5/3.3V, 3.6-10W DC/DC Converters

DATEL Data Acquisition products  

®

®

INNOVATION and EXCELLENCE

Single Output

UNR SM Series

Surface-Mount, Non-Isolated

1.8/2.5/3.3V, 3.6-10W DC/DC Converters

Features

n Low cost! High reliability!

n 1" x 1" x 0.47", SMT package

n Gull-wing leads; Standard reflow

n Complete; No external components

n Outputs: 1.8V/2A, 2.5V/2A, 3.3V/3A

n Inputs: 4.75-5.5V, 10.4-13.6V

n Guaranteed efficiencies to 87%

n Output noise as low as 30mVp-p

n Transient response as quick as 20µsec

n –40 to +70°C operation with no derating

n On/off control; EMC compliant

n IEC950/EN60950/UL1950 pending

n Modifications and customs for OEM's

DATEL's new 3.6-10W UNR SM Series consists of non-isolated, 5V-to-1.8V (2A),

5V-to-2.5V (2A), 5V-to-3.3V (3A), and 12V-to-3.3V (3A) DC/DC converters in

miniature, 1" x 1" surface-mount packages. The "gull-wing" packages (with metal

shells and non-conductive plastic baseplates) weigh a mere 17 grams and can

withstand temperatures up to +235°C. They are compatible with virtually all contem-

porary pick-and-place and solder-reflow processes.

The true benefits 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 distrib-

uted power will continue with more cost-effective, non-isolated devices. The low-cost,

easy-to-use (no external components required), highly reliable (100% fully auto-

mated SMT construction) 3.6-10W UNR SM Series makes this power processing at

the concluding point of use a practical reality today.

These versatile DC/DC's are fully line and load regulated. They feature user-

optional on/off control (for power-sequencing requirements), output current limiting,

and short-circuit protection (foldback technique with auto-recovery). Additionally, the

12V-to-3.3V model offers input undervoltage lockout (at 9.6V). Their impressive

guaranteed efficiencies enable all models to deliver their fully rated output power from

–40 to +70°C (ambient) without heat sinking or forced-air cooling.

If you've already considered and rejected the use of inefficient, step-down, linear

regulators, take a look at one of these new switching buck regulators. Their high

efficiency, ease-of-use, long-term reliability, and overall cost effectiveness will

impress you. Safety agency approvals are currently in progress.

+VIN

+VOUT

Á

INPUT

RETURN

À

OUTPUT

RETURN

LOGIC

GROUND

ON/OFF

CONTROL

UNDERVOLTAGE

SHUTDOWN

PWM

CONTROLLER

CURRENT LIMITING

& S.C. SHUTDOWN

REFERENCE &

ERROR AMP

Figure 1. Simplified Schematic

À "D5" models do not have input undervoltage shutdown.

Á "D5" models employ a more traditional buck-regulator design

in which this FET is replaced with a power Schottky diode.

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

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