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