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FAN5233 Datasheet

  • FAN5233

  • System Electronics Regulator for Mobile PCs

  • 15頁

  • FAIRCHILD

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FAN5233
System Electronics Regulator for Mobile PCs
Features
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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% ef鏗乧iency
Hysteretic mode for light loads
PWM mode for normal loads
Main regulators switch out of phase
300kHz 鏗亁ed frequency switching
RDS(ON) current sense over-current
Reduced BOM; Max. ef鏗乧iency
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 ef鏗乧iency 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 recti鏗乧ation 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 ef鏗乧iency 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 sensing of output current using
the RDS(ON) of the external MOSFETs, eliminating exter-
nal 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, under-
voltage, 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 鹵10% of their
settings.
Applications
鈥?Notebook PCs
鈥?Web tablets
鈥?Battery-powered instruments
REV. 1.0.6 1/22/02

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