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a

Tri-Mode: +3.3 V, +5 V, Adjustable

Micropower Linear Voltage Regulators

ADM663A/ADM666A*

FEATURES

Tri-Mode Operation

3.3 V, 5 V Fixed or +1.3 V to +16 V Adjustable

Low Power CMOS: 9

µA max Quiescent Current

High Current 100 mA Output

Low Dropout Voltage

Upgrade for ADM663/ADM666

“Small” 0.1

µF Output Capacitor (0805 Style)

+2 V to +16.5 V Operating Range

Low Battery Detector ADM666A

No Overshoot on Power-Up

Thermal Shutdown

APPLICATIONS

Handheld Instruments

LCD Display Systems

Pagers

Battery Operated Equipment

GENERAL DESCRIPTION

The ADM663A/ADM666A are precision linear voltage regula-

tors featuring a maximum quiescent current of 9

µA. They can

be used to give a fixed +3.3 V or +5 V output with no additional

external components or can be adjusted from 1.3 V to 16 V

using two external resistors. Fixed or adjustable operation is au-

rent makes these devices especially suitable for battery powered

systems. The input voltage range is 2 V to 16.5 V, and an out-

put current up to 100 mA is provided. Current limiting may be

set using a single external resistor. For additional safety, an

internal thermal shutdown circuit monitors the internal die

temperature.

The ADM666A features additional low battery monitoring cir-

cuitry to detect for low battery voltages.

The ADM663A/ADM666A are pin compatible enhancements

for the ADM663/ADM666. Improvements include an addi-

tional 3.3 V output range, higher output current, and operation

with a small output capacitor.

The ADM663A/ADM666A are available in an 8-pin DIP and

narrow surface mount (SOIC) packages.

*Patent pending.

FUNCTIONAL BLOCK DIAGRAMS

50mV

V

IN

ADM663A

SHDN

GND

V

TC

V

SET

V

OUT1

V

OUT2

SENSE

C2

1.3V

0.5V

C1

A2

A1

C3

D

E

C

O

D

E

R

V

0.9V

R2

R1

R3

50mV

V

IN

ADM666A

SHDN

GND

LBO

V

SET

V

OUT

SENSE

C2

1.3V

0.5V

C1

C4

A1

C3

D

E

C

O

D

E

R

V

1.3 V

LBI

R2

R1

R3