© 2002 Microchip Technology Inc.

DS21379B-page 1

TC1268

Features

• Very Low Dropout Voltage

• 500mA Output Current

• High Output Voltage Accuracy

• Standard or Custom Output Voltages

• Over Current and Over Temperature Protection

• SHDN Input for Active Power Management

• ERROR Output to Detect Low Battery

•5

µsec (typical) Wake-up Time from SHDN

Applications

• RAMBUS Memory Module

• Battery-Operated Systems

• Portable Computers

• Medical Instruments

• Instrumentation

• Cellular/GSM/PHS Phones

• Linear Post-Regulator for SMPS

• Pagers

• Digital Cameras

Device Selection Table

*Other output voltages and package options are available.

Please contact Microchip Technology Inc. for details.

Package Type

General Description

The TC1268 is a fixed output, fast turn-on, high

accuracy

(typically

±0.5%)

CMOS

low

dropout

regulator. Designed specifically for battery-operated

systems, the TC1268’s CMOS construction eliminates

wasted ground current, significantly extending battery

life. Total supply current is typically 80

µA at full load (20

to 60 times lower than in bipolar regulators).

TC1268’s key features include ultra low noise, very low

dropout voltage (typically 350mV at full load), and

fast response to step changes in load. The TC1268

also has a fast wake-up response time (5

µsec typically)

when

released

from

shutdown.

The

TC1268

incorporates both over temperature and over current

protection. The TC1268 is stable with an output

capacitor of only 1

µF and has a maximum output

current of 500mA.

Typical Application

Part Number

Output*

Voltage

(V)

Package

Junction

Temp. Range

TC1268-2.5VOA

2.5

8-Pin SOIC -40°C to +125°C

1

2

3

4

8

7

6

5

TC1268

NC

SHDN

8-Pin SOIC

GND

NC

BYPASS

ERROR

TC1268

1

µF

GND

SHDN

SHDN

+

500mA Fixed Output, Fast Response CMOS LDO with Shutdown