TC1073 datasheet(2/20 Pages) MICROCHIP

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TC1072/TC1073

DS21354B-page 2

General Description

The TC1072 and TC1073 are high accuracy (typically

±0.5%) CMOS upgrades for older (bipolar) low dropout

regulators. Designed specifically for battery-operated

systems, the devices’ CMOS construction eliminates

wasted ground current, significantly extending battery

life. Total supply current is typically 50

µA at full load (20

to 60 times lower than in bipolar regulators).

The devices’ key features include ultra low noise

operation (plus optional Bypass input); very low

dropout voltage (typically 85mV, TC1072 and 180mV,

TC1073 at full load) and fast response to step changes

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

devices are out-of-regulation (due to a low input

voltage or excessive output current). ERROR can be

used as a low battery warning or as a processor

RESET signal (with the addition of an external RC

network). Supply current is reduced to 0.5

µA(max) and

both VOUT and ERROR are disabled when the

shutdown input is low. The devices incorporate both

over-temperature and over-current protection.

The TC1072 and TC1073 are stable with an output

capacitor of only 1

µF and have a maximum output

current of 50mA, and 100mA respectively. For higher

output current versions, please see the TC1185,

TC1186, TC1187 (IOUT = 150mA) and TC1107, TC1108

and TC1173 (IOUT = 300mA) data sheets.

Typical Application

TC1072

TC1073

VOUT

GND

µF

VIN

VOUT

SHDN

Shutdown Control

(from Power Control Logic)

ERROR

Bypass

CBYPASS

470pF

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