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FAN5230 Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – System Electronics Regulator for Mobile PCs | |||
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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% efï¬ciency
⢠Hysteretic mode for light loads
⢠PWM mode for normal loads
⢠Main regulators switch out of phase
⢠300kHz ï¬xed frequency switching
⢠RDS(ON) current sense over-current
⢠Reduced BOM; Max. efï¬ciency
⢠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)
Applications
⢠Notebook PCs
⢠Web tablets
⢠Battery-powered instruments
Description
The FAN5230 is a high efï¬ciency 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 rectiï¬cation 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 efï¬ciency of greater than
95% over a wide range of input and output variations. The
third PWM controller generates 12V at 120mA. A propri-
etary technology is used for accurate [± 1%] sensing of out-
put 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 ALWAYS-
ON power at 3.3V and 5V for light (50mA) loads. Additional
FAN5230 features include over-voltage, under-voltage, and
over-current monitors and thermal shutdow protection.
A single Power-Good signal is issued when soft start is
completed and all outputs are within ± 10% of their settings.
REV. 2.8.5 10/17/01
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