Description

The FAN5231 is a highly integrated power controller, which provides a complete power management solution for mobile CPUs. The IC integrates two PWM controllers and a linear regulator as well as monitoring and protection circuitry into a single 28-lead plastic SSOP package. The two PWM controllers regulate the microprocessor core and I/O voltages with synchronous-rectified buck converters, while the linear regulator powers the CPU clock.

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 RDS(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