AP2011

Synchronous PWM with VFC Controller

Anachip Corp

www.anachip.com.tw

Rev. 1.1 Apr 1, 2005

1/9

Features

- Single 10V to 40V Supply Application

- 1.25V + 2.0% Voltage Reference

- Virtual Frequency Control

- Fast Transient Response.

- Synchronous Operation for High Efficiency

- Current Limit Function.

- Small Size with Minimum External Components

- Soft Start and Shutdown Functions

- Industrial Temperature Range

- Under Voltage Lockout Function

- SOP-14L Pb-Free Package

Applications

- Microprocessor Core Supply

- Low Cost Synchronous Applications

- Voltage Regulator Modules (VRM)

- Networking Power Supplies

- Sequenced Power Supplies

- Telecommunication Power Supplies.

Pin Assignments

SOP-14L

1

(Top View)

PVCC

OCSET

PHASE

PDRV

PGND

CAP

FB

AP2011

2

3

4

5

6

7

8

9

10

11

12

13

14

VCC

PGATE

VIN

NGATE

VREF

SGND

SS/SHDN

Ordering Information

AP2011 X X

Package

Packing

S: SOP-14L

Blank : Tube

A : Taping

General Description

The

AP2011

is

a

low-cost,

full

featured,

synchronous voltage-mode controller designed for

use in single ended power supply applications

where

efficiency

is

of

primary

concern.

Synchronous operation allows for the elimination of

heat sinks in many applications. The AP2011 is

ideal for implementing DC/DC converters needed to

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 1P+1N-channel power

switches.

AP2011’s features include temperature ompensated

to reduce external component count,

an internal virtual

frequency 200KHz oscillator, under-voltage lockout

protection, soft-start, shutdown function and current

sense comparator circuitry.

Virtual Frequency Control is a trademark of

PWRTEK, LLC.

Pin Descriptions

Pin Name

Pin

No.

Description

PGATE

1

Level shift-gate driver

VCC

2

Internal regulator voltage

PVCC

3

Power VCC

PDRV

4

PMOS Gat driver

PGND

5

Power Ground

NGATE

6

Low side driver output (N

MOSFET)

VIN

7

Chip supply voltage

CAP

8

Charge pump pin

SS/ SHDN

9

Soft start, a capacitor to

ground sets the slow start

time/set low for shutdown

function.

FB

10

Feedback input

OCSET

11

Sets the converter

over-current trip point

SGND

12

Signal Ground

PHASE

13

Input from the phase node

between the MOSFETs

VREF

14

Reference voltage