AP1521

White LED Step-Up Converter

Anachip Corp.

www.anachip.com.tw

Rev. 0.1 Apr. 27, 2004

2/8

Block Diagram

1MHz

Oscillator

RAMP

Generator

Σ

-

+

V

REF

1.25V

V

3

FB

R

C

C

C

310mV

Comparator

A2

R

S

Q

A1

1

Driver

SW

Q1

2 GND

4

SHDN

Shutdown

Absolute Maximum Ratings

Symbol

Parameter

Rating

Unit

VIN Pin Voltage

10

V

SW Voltage

36

V

Feedback Pin Voltage

10

V

SHDN Pin Voltage

10

V

Maximum Junction Temperature

125

Lead Temperature

300

Operating Temperature Range

-40 to +85

Storage Temperature Range

-40 to +125

Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical

damage. These values must therefore not be exceeded under any condition.