www.fairchildsemi.com
REV. 2.8.5 10/17/01
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)
Applications
• Notebook PCs
• Web tablets
• Battery-powered instruments
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 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.
FAN5230
System Electronics Regulator for Mobile PCs
