Revision 12/5/2008

Preliminary and all contents are subject to change without prior notice.

© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 1

500mA CMOS LDO Voltage Regulator

(Preliminary)

SE5218

Description

The SE5218 series of fixed output low dropout

linear regulators are designed for portable battery

powered applications, which require low noise

environment, fast enable response time, 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 SE5218 has been designed to be used with

low cost capacitors and requires a minimum output

capacitor of 1.0μF. Standard voltage versions are

1.5, 1.8, 2.5, 2.8, 3.0, and 3.3V.

Pin Configuration

Features

Typical 175mV Dropout Voltage at 150mA.

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

Excellent Line and Load Regulation.

High Accuracy Output Voltage of 2%.

Ultra-Low Ground Current at 65μA (Typ.)

Disable Current Less than 0.3μA (Typ.)

Thermal Protection.

Standard SOT-23-5L Packages.

Applications

USB removable devices

MPEG4 devices

Wireless LAN’s

Hand-Held Instrumentation.

Portable DVD players

Digital camera

Application Diagram