TC1186 datasheet(2/18 Pages) MICROCHIP

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TC1054/TC1055/TC1186

DS21350B-page 2

General Description

The TC1054, TC1055 and TC1186 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, very low dropout voltage – typically 85mV

(TC1054); 180mV (TC1055); and 270mV (TC1186) 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 canbeusedas 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 TC1054, TC1055 and TC1186 are stable with an

output capacitor of only 1

µF and have a maximum

output

current

50mA,

100mA

and

150mA,

respectively. For higher output current regulators,

please see the TC1173 (IOUT = 300mA) data sheet.

Typical Application

TC1054

TC1055

TC1186

VOUT

GND

µF

VIN

VOUT

SHDN

Shutdown Control

(from Power Control Logic)

ERROR

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