FAN5233

www.fairchildsemi.com

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

www.fairchildsemi.com

FAN5233
System Electronics Regulator for Mobile PCs

Features
5.4V to 24V input voltage range Five regulated outputs: 5V 5A (PWM) 3.3V 5A (PWM) 5V 50mA Always On (Linear) 12V/Adjustable 120mA Boost (PWM) 96% efficiency Hysteretic mode for light loads PWM mode for normal loads Main regulators switch out of phase 300kHz fixed frequency switching RDS(ON) current sense over-current Reduced BOM; Max. efficiency Optional current sense resistor for precision over-current detect Power Good signal for all voltages Input under-voltage lock-out (UVLO) Thermal shutdown ACPI compliant 24-pin TSSOP

Description
The FAN5233 is a high efficiency and high precision multiple-output voltage regulator for notebook PC and other similar battery-powered applications. It integrates three pulse-width modulated (PWM) switching regulator controllers and one linear regulator to convert 5.4V-to-24V notebook battery power into the voltage used by the circuitry that surrounds the microprocessor in these systems. The two primary PWM controllers in the FAN5233 use synchronous-mode rectification to provide 3.3V and 5V at over 5A each. They switch out-of-phase to minimize input ripple-current. Utilization of both input and output voltage feedback in a current-mode control allows for fast and stable loop response over a wide range of input and output variations. PWM control in normal operation and hysteretic control under light load provides efficiency of greater than 95% over a wide range of input and output variations. The third PWM controller generates 12V at 120mA. A proprietary technology is used for sensing of output current using
the RDS(ON) of the external MOSFETs, eliminating external current sense resistors which saves board space and reduces BOM cost. One integrated linear regulator provides stand-by ALWAYS-ON power at 5V for light (50mA) loads. Additional FAN5233 features include over-voltage, undervoltage, and over-current monitors and thermal shutdown protection. A single Power-Good signal is issued when soft start is completed and all outputs are within 10% of their settings.

Applications
Notebook PCs Web tablets Battery-powered instruments

REV. 1.0.6 1/22/02