AIC1594

1A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1594-P1 03/23/00

ANALOG INTEGRATIONS CORPORATION

www.analog.com.tw

4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.

TEL: (8863)577-2500 FAX:(8863)577-2510

4

TO-220-5, TO-263-5

PIN 1: IN

Supply

voltage

input

for

the

IC

switching regulator. A suitable input

bypass capacitor must be present at

this pin to minimize voltage transients

and to supply the switching currents

needed by the regulator.

PIN 2:OUT

Internal switch. The voltage at this pin

approximately –0.5V, with a duty cycle

PIN 3: GND

Ground requires a short, low noise

connection

to

ensure

good

load

regulation.

PIN 4: FB

Feedback input for fixed-output or

adjustable-output version. Connect di-

rectly to output for fixed operation

version or to a resistor divider for ad-

justable operation versions.

PIN 5: SHDN

Allows the switching regulator circuit

to be shutdown using logic level sig-

nals thus dropping the total input sup-

ply current to approximately 80

µA.

Drive it high to disable the reference ,

control

circuitry

,

and

internal

switches .Drive low or connect to

GND for normal operation.

SO8, DIP8

PIN 1, 2: IN

Supply voltage input for the IC switch-

ing regulator. A suitable input bypass

capacitor must be present at this pin to

minimize voltage transients and to

supply the switching currents needed

by the regulator.

PIN 3, 4: OUT Internal switch. The voltage at this pin

proximately –0.5V, with a duty cycle of

PIN 5, 6: GNDGround requires a short, low noise

connection to ensure good load regu-

lation.

PIN 7:

FB Feedback input for fixed-output or ad-

justable-output version. Connect di-

rectly to output for fixed operation ver-

sion or to a resistor divider for adjusta-

ble operation versions.

PIN 8:

SHDN

Allows the switching regulator cir-

cuit to be shutdown using logic level

signals thus dropping the total input

supply current to approximately 80

µA.

Drive it high to disable the reference ,

control

circuitry

,

and

internal

switches .Drive low or connect to GND

for normal operation.