AP1602

Step-Up DC/DC Converter

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev. 0.1 Apr. 14, 2004

1/7

Features

-A Guaranteed Start-Up from less than 0.9 V.

-High Efficiency.

-Low Quiescent Current.

-Less Number of External Components needed.

-Low Ripple and Low Noise.

-Space Saving Packages: SOT89-5

Applications

-Pagers.

-Cameras.

-Wireless Microphones.

-Pocket Organizers.

-Battery Backup Suppliers.

-Portable Instruments.

General Description

The AP1602 is a high efficiency step-up DC/DC

converter for applications using 1 to 2 NiMH battery

cells. Only three external components are required

to deliver a fixed output voltage of 3.3V. The

AP1602 starts up from less than 0.9V input with

1mA load. Pulse Frequency Modulation scheme

brings optimized performance for applications with

light output loading and low input voltages. The

output ripple and noise are lower compared with the

circuits operating in PSM mode.

The PFM control circuit operating in 100KHz (max.)

switching

rate

results

in

smaller

passive

components. The space saving SOT89-5 packages

make the AP1602 an ideal choice of DC/DC

converter for space conscious applications, like

pagers,

electronic

cameras,

and

wireless

microphones.

Pin Assignments

1

2

3

74

5

LX

GND

OUT

REF

AP1602A

SHDN

1

2

3

74

5

OUT

GND

LX

FB

SOT89-5L

AP1602B

REF

Pin Descriptions

Pin No.

Pin

Name

A

B

Description

REF

1

3

1.2V Reference Voltage. Bypass

with a 0.1µF capacitor.

OUT

5

4

Power Output. OUT provides

bootstrap power to the IC.

LX

4

5

N-Channel and P-Channel Power

MOSFET Drain

GND

2

2

Ground

SHDN

3

-

Shutdown

Input.

Drive

high

for shutdown mode. Connect to

OUT for normal operation.

FB

-

1

Feedback pin

Ordering Information

Package

AP1602 X X X X

Packing

Blank : Tube

A

: Taping

Y: SOT89-5L

Lead Free

Blank : Normal

L : Lead Free Package

Version

A: A version

B: B version