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ISL8010

Monolithic 600mA Step-Down Regulator with Low Quiescent Current

Intersil 

ISL8010

Pin Descriptions

PIN NUMBER

1

2

3

4

PIN NAME

SGND

PGND

LX

VIN

5

VDD

6

SYNC

7

EN

8

PG

9

VO

10

FB

Block Diagram

PIN FUNCTION

Negative supply for the controller stage

Negative supply for the power stage

Inductor drive pin; high current digital output with average voltage equal to the regulator output voltage

Positive supply for the power stage

Power supply for the controller stage

SYNC input pin; when connected to HI, regulator runs at forced PWM mode; when connected to Low, auto

PFM/PWM mode; when connected to external sync signal, at external PWM frequency up to 12MHz

Enable

Power-Good open drain output

Output voltage sense

Voltage feedback input; connected to an external resistor divider between VO and SGND for variable

output

100Ω

VDD

0.1µF

VO

C4 124K

470pF

FB 5M

10pF

-

+

100K

SYNC

EN

10µF

SYNC

EN

CLOCK

SOFT-

START

5V

+

–

BANDGAP

REFERENCE

SGND

PWM

COMPEN-

SATION

RAMP

GENERA-

TOR

UNDER-

VOLTAGE

LOCKOUT

POWER

GOOD

INDUCTOR SHORT

+

-

CURRENT

SENSE

+

-

PWM

COMPARATOR

PFM

ON-TIME

CONTROL

CONTROL

LOGIC

P-DRIVER

VIN

LX 1.8µH

+

-

PWM

COMPARATOR

TEMPERATURE

SENSE

N-DRIVER

10µF

+

-

SYNCHRONOUS

RECTIFIER

PGND

PG

1.8V

0 TO 600mA

100K

PG

3

FN6191.0

September 27, 2005

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