Revision 9/4/2008

Preliminary and all contents are subject to change without prior notice

© Seaward Electronics Inc., 2007. • www.seawardinc.com • Page 1

Dual 200mA CMOS

LDO Voltage Regulator

(Preliminary)

SE5221

Description

SE5221 is a dual-channel low dropout

regulator supplying up to 200mA at each channel.

The output voltages are selectable between

2.8V/3.3V for Channel-1 and 1.3V/1.8V for

Channel-2 with 3% accuracy.

The SE5221 uses internal PMOS transistors

as the pass devices to regulate the output voltages.

The IC consumes 120μA supply current when both

channels are turned on, and is nearly independent

of load currents and dropout conditions. The EN1

and EN2 pins allows for individual channel controls.

When both outputs are shut down simultaneously,

the chip will be turned off and consumes nearly zero

operating current which is suitable for battery-power

devices. Other features include a current limiting,

and over temperature protection.

Features

Typical 256mV Dropout Voltage at 200mA

Up to 200mA Output Current (Each Channel)

Low Ground Current at 120uA (Typ.)

Dual Shutdown Pins to Control Each Output

Current Limiting and Thermal Protection

Two LDOs in SOT-23-6L Package

100% Lead (Pb)-Free

Pin Configuration

Application

Cellular Phones.

Laptop, Notebook, and Palmtop Computers.

Battery-Powered Equipments.

Hand-held Equipments.

Wireless LAN Devices.

Application Diagram

EN1

EN2

GND

VIN

VOUT1

VOUT2

2.2uF

2.2uF

2.2uF

Chip enable

Chip enable

1

6

2

3

4

5

Ordering Information

SE5221 _ _ L G

Pin (1=>6):

L: SOT23-6L