ISL6121

FN9004 Rev 2.00

Page 2 of 11

November 12, 2004

Simplified Block Diagram

GND

VIN

VIN

EN

FAULT

OUT

OUT

OUT

Q-PUMP

CURRENT AND TEMP.

POR

MONITORING, GATE AND

OUTPUT CONTROL

LOGIC

LOGIC

Pin Descriptions

PIN #

SYMBOL

FUNCTION

DESCRIPTION

1

GND

IC GND Reference

2, 3

VIN

Chip Bias, Controlled

Supply Input, Undervoltage

Lock-Out

VIN provides chip bias voltage. At VIN < 2.5V chip functionality is disabled, FAULT latch

is cleared and floating. OUT is pulled and held low.

4

ENABLE /

ENABLE

Enable / Enable Not Input

Enables chip when VIN and ENABLE > 2.5V or ENABLE < 0.6V

5

FAULT

Over Current Fault Indicator Overcurrent fault indicator. FAULT is disabled for 12ms after turn-on. This output is pulled

low to GND after the current limit time-out period has expired and stays latched until

ENABLE is deasserted.

6, 7, 8

VOUT

Controlled Supply Output

Voltage output, connect to load to protect. Upon an overcurrent condition VOUT is current

limited to 2A. Current limit response time is within 200

S. This output will remain in current

limit for approximately 12ms before being latched off.