FAN5232

www.fairchildsemi.com

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

www.fairchildsemi.com

FAN5232
Adjustable PWM Buck Controller for LCD PCs

Features
Three outputs: Adjustable Buck, 3.3V-Always, 5V-Always Adjustable synchronous switcher, 5V 80% Vin 1% internal reference precision Current mode with voltage feed-forward Precision current limit option Charge pump works at all loads No shoot-through current Independent shutdown pins for ACPI Power Good, input UVLO, output OV 5.6V to 24V input voltage range

Description
The FAN5232 is a high efficiency 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 efficiency over a wide range of loads. Current sense based on MOSFET RDS,on gives maximum efficiency, while also permitting use of an optional sense resistor for high precision. The FAN5232 is available in a 14 pin TSSOP package.

Applications
LCD PCs Notebook PCs and PDAs Hand-held portable instruments

Block Diagram
Vin 16 22V

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