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FAN5230

Fairchild Semiconductor
Part Number FAN5230
Manufacturer Fairchild Semiconductor
Description System Electronics Regulator
Published Mar 30, 2005
Detailed Description www.fairchildsemi.com FAN5230 System Electronics Regulator for Mobile PCs Features • • • • • • • • • • • • • • • • • •...
Datasheet PDF File FAN5230 PDF File

FAN5230
FAN5230

Overview
www.
fairchildsemi.
com FAN5230 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) 3.
3V @ 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 QSOP 2nd source by Intersil (IPM6220) Description The FAN5230 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 two linear regulators 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 FAN5230 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 accurate [± 1%] 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.
Two integrated linear regulators provide stand-by ALWAYSON power at 3.
3V and 5V for light (50mA...


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