ISL62881C Datasheet, PDF (5/37 Pages) Intersil Corporation – Single-Phase PWM Regulator for IMVP-6.5™ Mobile CPUs and GPUs

ISL62881C, ISL62881D
Table of Contents
Related Literature . . . . . . . . . . . . . . . . . . . . . . 1
Load Line Regulation . . . . . . . . . . . . . . . . . . . . 1
Pin Function Description . . . . . . . . . . . . . . . . . 2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 4
Absolute Maximum Ratings . . . . . . . . . . . . . . . 6
Thermal Information . . . . . . . . . . . . . . . . . . . . 6
Recommended Operating Conditions . . . . . . . . 6
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . 6
Gate Driver Timing Diagram. . . . . . . . . . . . . . . 9
Simplified Application Circuits . . . . . . . . . . . . . 9
Theory of Operation . . . . . . . . . . . . . . . . . . . . 12
Multiphase R3™ Modulator .............................. 12
Diode Emulation and Period Stretching.............. 13
Start-up Timing ............................................. 13
Voltage Regulation and Load Line
Implementation ........................................... 14
Differential Sensing ........................................ 16
CCM Switching Frequency ............................... 16
Modes of Operation ........................................16
Dynamic Operation......................................... 16
Protections .................................................... 17
Current Monitor ............................................. 17
Adaptive Body Diode Conduction
Time Reduction ............................................ 18
Overshoot Reduction Function.......................... 18
Key Component Selection . . . . . . . . . . . . . . . . 18
R_BIAS ........................................................... 18
Inductor DCR Current-Sensing Network ............ 18
Resistor Current-Sensing Network .................. 20
Overcurrent Protection ................................... 21
Load Line Slope............................................. 21
Current Monitor............................................. 21
Compensator ................................................ 22
Optional Slew Rate Compensation Circuit
for 1-Tick VID Transition ............................... 24
Voltage Regulator Thermal Throttling ............... 24
Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . 25
CPU Application Reference Design
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . 29
GPU Application Reference Design
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . 30
Typical Performance . . . . . . . . . . . . . . . . . . . . 32
Revision History . . . . . . . . . . . . . . . . . . . . . . . 35
Products. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Package Outline Drawing
L28.4x4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Package Outline Drawing
L32.5x5E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5
FN7596.0
March 8, 2010