AP2002

Synchronous PWM 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. 0.2 Apr 14, 2004

1/7

Features

- Single or Dual Supply Application

- 0.8V + 1.0% Voltage Reference.

- Fast transient response.

- Synchronous operation for high efficiency (95%)

- On-chip power good, OVP protect.

- Small size with minimum external components

- Soft Start and enable functions

- Industrial temperature range

- Under Voltage Lockout function

- SOP-14L package

Applications

- Microprocessor core supply

- Low cost synchronous applications

- Voltage Regulator Modules (VRM)

- DDR termination supplies

- Networking power supplies

- Sequenced power supplies

General Description

The AP2002 is a low-cost, full featured, and

synchronous voltage-mode controller designed for

use in single ended power supply applications

where efficiency is of primary concern.

This

synchronous operation allows the elimination of

heat sinks in many applications. The AP2002 is

ideal for implementing DC/DC converters that is

needed for the power advanced microprocessors in

low cost

systems,

or

in

distributed

power

applications where efficiency is important. Internal

level-shift, high-side drive circuitry, and preset

shoot-thru control, allows the use of inexpensive

N-channel power switches.

AP2002 features include temperature compensated

voltage reference, an internal 200Khz virtual

frequency

oscillator,

under

voltage

lockout

protection, soft-start function and current sense

comparator circuitry.

Power good signaling,

shutdown, and over voltage protection are also

provided by AP2002.

Pin Assignment

SOP-14L

1

(Top View)

VCC

PWRGD

OVP

OCSET

PHASE

DRVH

PGND

DRVL

BSTL

BSTH

SENSE

COMP

GND

SS/SHDN

AP2002

2

3

4

5

6

7

8

9

10

11

12

13

14

Ordering Information

AP2002 X X X

Package

Packing

S: SOP-14L

Blank : Tube

A : Taping

Lead Free

Blank : Normal

L : Lead Free Package

Pin Descriptions

Name

Description

VCC

Chip supply voltage

PWRGD

Logic high indicates correct output

voltage (open drain output)

OVP

Over voltage protection

OCSET

Sets the converter over-current trip

point

PHASE

Input from the phase node between

the MOSFETs

DRVH

High side driver output

PGND

Power ground

DRVL

Low side driver output

BSTL

Bootstrap, low side driver

BSTH

Bootstrap, high side driver

SENSE

Voltage sense input

COMP

Compensation pin

SS/ SHDN

Soft start, a capacitor to ground sets

the slow start time

GND

Signal ground