Revision 9/26/2012

Preliminary and all contents are subject to change without prior notice

© Seaward Electronics Inc., 2006. • www.seawardinc.com.cn • Page 1

Low Power Low Noise LDO

CMOS Voltage Regulator

SE5509

Description

The SE5509 series of fixed output low dropout

linear regulators are designed for portable battery

powered applications, which require low power

consumption, low noise environment, 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 SE5509 has been designed to be used

with low cost capacitors and requires a minimum

output capacitor of 1.0μF. The output voltages

range from 1.3V to 4.4V in 100mV increments.

Standard voltage versions are 1.5, 1.8, 2.5, 2.8, 3.0,

and 3.3V.

Features



Typical 200mV 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 20μA (Typ.)



Disable Current Less than 0.1μA (Typ.)



Over Current and thermal Protection.



No Reverse Current.



Standard SOT-23-5L and TSOP-5 Package.

Pin Configuration

5

1

2

3

4

SOT-23-5L / TSOP-5

(Top View)

VIN

VOUT

BYPASS

GND

ENABLE

Application



USB removable devices



MPEG4 devices



Wireless LAN’s



Hand-Held Instrumentation.



Portable DVD players



Digital camera

Block Diagram

Ordering Information

SE5509

_ _ _

Pin (1=>5):

Package:

L: SOT-23-5L / TSOP-5