EC3201S

1A, 1.5MHz, Synchronous

Step Down DC/DC Converter

E-CMOS Corp. (www.ecmos.com.tw)

5E12N-Rev. F001

1/9

..

General Description

EC3201S is a high efficiency step down DC/DC converter operated with current mode and constant frequency.

The internal switch and synchronous rectifier are integrated for high efficiency. External Schottky diodes are not

required. The supply current is only 110µA during operation and drops to less than 1µA in shutdown. EC3201S

can supply 1A of load current from 2.5V to 5.5V supply voltage.

The switching frequency is set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. It

can run 100% duty cycle for low dropout application. The output voltage of EC3201S is adjustable from the FB

pin. EC3201S is RoHS compliant and Lead (Pb) Free.

Features



1A output current



Current mode operation



High efficiency up to 95%



Shutdown current < 1µA



2.5V to 5.5V supply voltage



Over temperature protection



Constant frequency operation



Full duty ratio, 0

– 100% in dropout



RoHS Compliant and Lead (Pb) Free

Applications



Cellular phones



PDAs and smart phones



MP3 players



Digital still cameras



Slim-type DVD



Wireless and DSL card



Microprocessors and DSP core supplies



Portable instruments

Pin Assignments

1

2

3

5

4

FB

SW

GND

EN

Vin

Top View

TSOT23-5L

GND

EN

SW

Top View

TDFN 2x2-6L

NC

Vin

FB

1

2

3

6

5

4