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www.fairchildsemi.com

FAN5232

Adjustable PWM Buck Controller for LCD PCs

Features

鈥?Three outputs: Adjustable Buck, 3.3V-Always,

5V-Always

鈥?Adjustable synchronous switcher, 5V 鈥?80% Vin

鈥?1% internal reference precision

鈥?Current mode with voltage feed-forward

鈥?Precision current limit option

鈥?Charge pump works at all loads

鈥?No shoot-through current

鈥?Independent shutdown pins for ACPI

鈥?Power Good, input UVLO, output OV

鈥?5.6V to 24V input voltage range

Description

The FAN5232 is a high ef鏗乧iency and high precision DC/DC

controller for PCs. It has a synchronous switcher whose

output can be adjusted from 5V up to 80% of Vin. It also has

two linear regulators for standby, 3.3V and 5V. The PWM

utilizes both input and output voltage feedback in a

current-mode control, allowing for fast and stable loop

response over a wide range of input and output variations.

Synchronous switching provides best ef鏗乧iency over a wide

range of loads. Current sense based on MOSFET R

DS,on

gives maximum ef鏗乧iency, while also permitting use of an

optional sense resistor for high precision.

The FAN5232 is available in a 14 pin TSSOP package.

Applications

鈥?LCD PCs

鈥?Notebook PCs and PDAs

鈥?Hand-held portable instruments

Block Diagram

Vin = 16鈥?2V

1

3.3V-Always

5V-Always

2

3

FAN5232

4

SDWN

SDNADJ

PWRGD

5

6

7

14

13

12

11

10

9

8

+

12V @ 8A

REV. 1.1.1 10/7/02

next

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