FAN5231 datasheet(1/17 Pages) FAIRCHILD

Part #	FAN5231

Description	Precision Dual PWM Controller And Linear Regulator for Notebook CPUs

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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REV. 1.1.1 8/15/01

Features

• Provides 3 Regulated Voltages

– Microprocessor core (SpeedStep™-enabled)

– Microprocessor I/O

– Microprocessor Clock Generator

• High Efﬁciency Over Wide Load Range

• Not Dissipative Current-Sense Scheme

– Uses MOSFET’s R DS(ON)

– Optional Current-Sense Resistor for Precision

Overcurrent

• Adaptive Dead Time Drivers for N-Channel MOSFETs

• Operates from +5V, +3.3V and Battery (5.6-24V) Inputs

• Precision Core Voltage Control:

– Remote “Kelvin” Sensing

– Summing Current-Mode Control

– On-Chip Mode-Compensated “Droop” for Optimum

Transient Response and Lower Processor Power

Dissipation

• TTL-Compatible 5-Bit Digital Output Voltage Selection

– Wide Range - 0.925VDC to 1.3VDC in 25mV Steps,

and from 1.3VDC to 2.0VDC in 50mV Steps

– Programmable “On-the-Fly” VID code change with

customer programmable slew rate and 100ms settling

time

• Power-Good Output Voltage Monitor

• No negative Core and I/O voltage on turn-off

• Over-Voltage, Under-Voltage and Over-Current Fault

Monitors

• 300kHz Fixed Switching Frequency

• Thermal Shut-Down

Applications

• Converters for Mobile Dual-Mode CPUs

• Web Tablets

• Internet Appliances

FAN5231

Precision Dual PWM Controller And Linear

Regulator for Notebook CPUs

Figure 1. Simplified Power System Diagram

+VIN

VOUT1

VOUT2

VOUT3

FAN5231

CORE

I/ O

PWM 2

LI NEAR

CONTROLLER

REGULATOR

PWM 1

CONTROLLER

CPU CLK

+VIN

3.3V

VI D CODE

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