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www.fairchildsemi.com

FAN5231

Precision Dual PWM Controller And Linear

Regulator for Notebook CPUs

Features

鈥?Provides 3 Regulated Voltages

鈥?Microprocessor core (SpeedStep鈩?enabled)

鈥?Microprocessor I/O

鈥?Microprocessor Clock Generator

鈥?High Ef鏗乧iency Over Wide Load Range

鈥?Not Dissipative Current-Sense Scheme

鈥?Uses MOSFET鈥檚 R

DS(ON)

鈥?Optional Current-Sense Resistor for Precision

Overcurrent

鈥?Adaptive Dead Time Drivers for N-Channel MOSFETs

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

鈥?Precision Core Voltage Control:

鈥?Remote 鈥淜elvin鈥?Sensing

鈥?Summing Current-Mode Control

鈥?On-Chip Mode-Compensated 鈥淒roop鈥?for Optimum

Transient Response and Lower Processor Power

Dissipation

鈥?TTL-Compatible 5-Bit Digital Output Voltage Selection

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

and from 1.3VDC to 2.0VDC in 50mV Steps

鈥?Programmable 鈥淥n-the-Fly鈥?VID code change with

customer programmable slew rate and 100ms settling

time

鈥?Power-Good Output Voltage Monitor

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

鈥?Over-Voltage, Under-Voltage and Over-Current Fault

Monitors

鈥?300kHz Fixed Switching Frequency

鈥?Thermal Shut-Down

Applications

鈥?Converters for Mobile Dual-Mode CPUs

鈥?Web Tablets

鈥?Internet Appliances

+V

IN

PWM 2

V

OUT2

I/ O

CONTROLLER

PWM 1

CONTROLLER

V

OUT1

CORE

+V

IN

3.3V

V

OUT3

CPU CLK

LI NEAR

REGULATOR

VI D CODE

FAN5231

Figure 1. Simplified Power System Diagram

REV. 1.1.1 8/15/01

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