AP1609

PWM/PFM Dual Mode 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.1.2 Mar.25, 2005

1/8

Features

- Input Voltage Range: 2.5~6V

- Output Voltage Range: 3.0~17V（±2.5%）

- PWM/PFM Switching Control

- Oscillator Frequency: 300KHz（±20%）

- High Efficiency: 91%（Typ .）

- Built-in internal N-Channel MOS

- Pb-Free Package: SOP-8L/TSSOP-8L

Applications

- Electronic Information Organizers

- Palmtops

- Cellular and portable phones

- Portable Audio Systems

- Various Multi-function Power Supplies

General Descriptions

The AP1609 is high efficient step-up DC/DC

converter. Large output current is possible having

a built in internal N channel MOSFET, and using an

external coil and diode.

Output voltage is programmable with 1.23V of

standard voltage supply internal, and using

externally connected components, output voltage

（

FB） can be set up at will.

With a 300KHz switching frequency, the size of the

external components can be reduced. Control

switches from PFM to PWM during light loads with

the AP1609（PWM/PFM switchable）and the series

is highly efficient from light loads to large output

currents.

During stand-by time （CE pin “Low”）, current

consumption is reduced to 1µA.

Pin Assignment

1

2

3

4

8

7

6

5

CE

LX

FB

AP1609

LX

GND

GND

PGND

Vcc

SOP-8L

1

3

2

4

8

6

7

5

GND

Vcc

Vcc

CE

LX

PGND

PGND

FB

AP1609

TSSOP-8L

Pin Descriptions

Pin No.

Pin

Name SOP TSSOP

Description

FB

3

5

Feedback pin

CE

1

4

Chip Enable:

H: Enable

L: Disable

Vcc

2

2、3

IC signal power supply pin

PGND

4

6、7

Power MOSFET GND

LX

5、68

Switch

Pin.

Connect

external

inductor/diode

here. Minimize trace area

at this pin to reduce EMI.

GND 7、8

1

GND Pin