Revision 12/4/2008

Preliminary and all contents are subject to change without prior notice

© Seaward Electronics Inc., 2004. • www.seawardinc.com.cn • Page 1

1.5A CMOS Ultra LDO Voltage

Regulator with EN

SE5220

Description

The SE5220 series of fixed output ultra low

dropout linear regulators are designed for portable

battery powered applications, which require low

power consumption and low dropout voltage.

Each device contains a bandgap voltage reference,

an error amplifier, a PMOS power transistor, and

resistors for setting output voltage, and current limit

and temperature limit protection circuits.

The SE5220 has been designed to be used

with low cost capacitors and requires a minimum

output capacitor of 1.0μF. Standard voltage versions

are 3.3V, 3.0V, and adjustable output from 1.25V to

4.5V.

Features

Typical 100mV Dropout Voltage at 500mA.

Fast Enable Turn-On Time of 20μs (Typ.)

Excellent Line and Load Regulation.

High Accuracy Output Voltage of 2%.

Ultra-Low Ground Current at 50μA (Typ.)

Disable Current Less than 0.2μA (Typ.)

Thermal and Over-Current Protection.

Standard SOP-8 Package.

Pin Configuration

Application

USB removable devices

MPEG4 devices

Wireless LAN’s

Hand-Held Instrumentation.

Portable DVD players

Digital camera

Block Diagram