AP1624

PWM/PFM Dual Mode Step-up DC/DC Controller

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.1.1 Dec.23, 2004

1/7

Features

- Input Voltage Range: 0.9~6V

- PWM/PFM Switching Control

- High Efficiency: 90%

- Oscillator Frequency: 300kHz（±15%）

- Pb-Free Package: SOT23-5

Applications

- Electronic Information Organizers

- Palmtops

- Cellular and portable phones

- Portable Audio Systems

- Various Multi-function Power Supplies

General Descriptions

The AP1624 is multi-functional step-up DC/DC

controllers. Large output current is possible using

an externally connected N channel MOSFET, coil,

and diode.

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 AP1624（PFM/PWM 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 3µA.

Pin Assignment

1

3

2

5

4

FB

V

CC

EXT

CE

GND

SOT23-5

(TOP VIEW)

Pin Descriptions

Pin

No.

Pin

Name

Function

1

FB

Feedback pin

2

IC Power Supply pin

3

CE

Chip Enable:

H: Enable

L: Disable

4

GND

GND pin

5

EXT

External N-MOSFET Connection