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FAN5232

Fairchild Semiconductor
Part Number FAN5232
Manufacturer Fairchild Semiconductor
Description Adjustable PWM Buck Controller
Published Mar 30, 2005
Detailed Description www.fairchildsemi.com FAN5232 Adjustable PWM Buck Controller for LCD PCs Features • Three outputs: Adjustable Buck, 3....
Datasheet PDF File FAN5232 PDF File

FAN5232
FAN5232

Overview
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 FAN5232 PRODUCT SPECIFICATION Pin Assignments VBATT 3V_ALWAYS 5V_ALWAYS AGND SDWN SDNADJ PWRGD 1 2 3 4 5 6 7 14 13 12 11 10 9 8 CPUMP HSD ISNS SW LSD PGND VFB Pin Description Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name VBATT 3V_ALWAYS 5V_ALWAYS AGND SDWN SDNADJ PWRGD VFBSW PGND LSD SW ISNS HSD CPUMP Pin Function Description Battery Voltage.
Battery voltage sensor.
3.
3V-ALWAYS Linear Regulator.
Total load current on pins 2 and 3 together must not exceed 50mA.
5V-ALWAYS Linear Regulator.
Total load current on pins 2 and 3 together must not exceed 50mA.
Analog Ground.
IC Shutdown.
Puts entire chip into shutdown.
OFF=0.
O...


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