©2001 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev. 1.0.0

Features

• Low Quiescent Current

• Low Dropout Voltage

• Low Temperature Coefficient

• Tight Line and Load Regulation

• Guaranteed 100mA Output Current

• Internal Short Current & Thermal Limit

• Error Signals of Output Dropout (8 pin Versions Only)

• External Shut-down ( 8 pin Versions Only)

Description

The KA78RLOO is an adjustable micro power voltage

regulator suitable for use in battery-powered systems. This

regulator has various functions such as alarm which warns of

a low output voltage, often due to falling batteries on the

input, the external shutdown which enables the regulator to

be switched on and off, current and temperature limiting.

Internal Block Diagram

OUT(1)

PROGRAM

(2)

SHUTDOWN(3)

GROUND(4)

ERROR(5)

TAP(6)

FEEDBACK(7)

INPUT(8)

C1

+

++

+

FROM

EXTERNAL

INPUT

+

++

+

1.25V

REFERENCE

-

--

-

+

++

+

+

++

+

OFFSE

T

-

--

-

+

++

+

ERROR

AMPLIFIER

ERROR

COMPARATO

R

TO

EXTERNAL

INPUT

SCP

ERROR

COMPARATOR

KA78RL00

Adjustable Micro Power Voltage Regulator

8-SOP

1