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FAN5231

Fairchild Semiconductor
Part Number FAN5231
Manufacturer Fairchild Semiconductor
Description Precision Dual PWM Controller And Linear Regulator
Published Mar 30, 2005
Detailed Description www.fairchildsemi.com FAN5231 Precision Dual PWM Controller And Linear Regulator for Notebook CPUs Features • Provides ...
Datasheet PDF File FAN5231 PDF File

FAN5231
FAN5231


Overview
www.
fairchildsemi.
com FAN5231 Precision Dual PWM Controller And Linear Regulator for Notebook CPUs 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 +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 FAN5231 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.
The FAN5231 includes 5-bit digital-to-analog converter (DAC) that adjusts the core PWM output voltage...


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