 2002-2012 Microchip Technology Inc.

DS21362C-page 1

TC1173

Features

• Extremely Low Supply Current for Longer Battery Life

• Very Low Dropout Voltage

• 300mA Output Current

• Standard or Custom Output Voltages

• ERROR Output Can Be Used as a Low Battery

Detector or Processor Reset Generator

• Power Saving Shutdown Mode

• Bypass Input for Ultra Quiet Operation

• Over Current and Over Temperature Protection

• Space-Saving MSOP Package Option

Applications

• Battery Operated Systems

• Portable Computers

• Medical Instruments

• Instrumentation

• Cellular/GSM/PHS Phones

• Linear Post-Regulators for SMPS

• Pagers

Device Selection Table

NOTE: xx indicates output voltages

Available Output Voltages: 2.5, 2.8, 3.0, 3.3, 5.0.

Other output voltages are available. Please contact Microchip

Technology Inc. for details.

General Description

The TC1173 is a precision output (typically ±0.5%)

CMOS low dropout regulator. Total supply current is

typically 50

A at full load (20 to 60 times lower than in

bipolar regulators).

TC1173 key features include ultra low noise operation

(plus optional Bypass input); very low dropout voltage

(typically 240mV at full load) and internal feed-forward

compensation for fast response to step changes in

load. An error output (ERROR) is asserted when the

TC1173 is out-of-regulation (due to a low input voltage

or excessive output current). ERROR can be set as a

low battery warning or as a processor RESET signal

(with the addition of an external RC network). Supply

current is reduced to 0.05

ERROR fall to zero when the shutdown input is low.

The TC1173 incorporates both over temperature and

over current protection. The TC1173 is stable with an

output capacitor of only 1

F and has a maximum

output current of 300mA.

Typical Application

Package Type

Part Number

Package

Junction

Temp. Range

TC1173-xxVOA

8-Pin SOIC

-40°C to +125°C

TC1173-xxVUA

8-Pin MSOP

-40°C to +125°C

TC1173

1

2

3

45

6

7

8

470pF

(Optional)

Shutdown Control

(from Power Control Logic)

C1

1

μF

GND

NC

Bypass

NC

SHDN

+

ERROR

R3

1M

ERROR

8-Pin SOIC

1

2

3

4

5

6

7

8

NC

GND

NC

Bypass

TC1173VOA

8-Pin MSOP

1

2

3

4

5

6

7

8

NC

GND

NC

Bypass

SHDN

TC1173VUA

ERROR

SHDN

ERROR

300mA CMOS LDO with Shutdown ERROR Output and Bypass