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FAN5233

Fairchild Semiconductor
Part Number FAN5233
Manufacturer Fairchild Semiconductor
Description System Electronics Regulator
Published Mar 30, 2005
Detailed Description www.fairchildsemi.com FAN5233 System Electronics Regulator for Mobile PCs Features • • • • • • • • • • • • • • • • • •...
Datasheet PDF File FAN5233 PDF File

FAN5233
FAN5233

Overview
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 mo...


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