ADM663A/ADM666A

REV. 0

–3–

PIN FUNCTION DESCRIPTION

Mnemonic

Function

Voltage Regulator Output(s).

Voltage Regulator Input.

SENSE

Current Limit Sense Input. (Referenced to

GND

Ground Pin. Must be connected to 0 V.

LBI

Low Battery Detect Input. Compared with 1.3 V.

LBO

Low Battery Detect Output. Open Drain Output.

SHDN

Digital Input. May be used to disable the device

so that the power consumption is minimized.

Voltage Setting Input. Connect to GND for

connect to external resistive divider for

adjustable output.

Temperature-Proportional Voltage for negative

TC Output.

PIN CONFIGURATIONS

DIP & SOIC

SENSE

V

OUT2

V

OUT1

GND

V

IN

V

TC

V

SET

SHDN

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

ADM663A

DIP & SOIC

SENSE

V

OUT

LBI

GND

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

ADM666A

V

IN

LBO

V

SET

SHDN

ORDERING GUIDE

Temperature

Package

Model

Range

Option

ADM663AAN

–40

°C to +85°C

N-8

ADM663AAR

–40

°C to +85°C

R-8

ADM666AAN

–40

°C to +85°C

N-8

ADM666AAR

–40

°C to +85°C

R-8

TERMINOLOGY

Dropout Voltage:

The input/output voltage differential at

which the regulator no longer maintains regulation against fur-

ther reductions in input voltage. It is measured when the output

decreases 100 mV from its nominal value. The nominal value is

Line Regulation:

The change in output voltage as a result of

a change in the input voltage. It is specified as a percentage

change in output voltage for an input voltage change.

Line Reg

=

∆V

OUT

(100)

∆V

IN

Load Regulation:

The change in output voltage for a change

in output current.

Load Reg (

Ω) = ∆

∆I

OUT

Quiescent Current:

The input bias current which flows when

the regulator output is unloaded or when the regulator is in

shutdown.

Sense Input Threshold:

Current limit sense voltage. This

occurs.

Input-Output Saturation Resistance (ADM663A):

This is a

measure of the internal MOS transistor effective resistance in se-

at low currents may be calculated by multiplying the load cur-

rent by the saturation resistance.

Thermal Limiting: This feature monitors the internal die tem-

perature and disables the output when an internal temperature

of 125

°C is reached.

Maximum Power Dissipation:

The maximum total device

dissipation for which the regulator will continue to operate

within specifications.