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PDF ISL62881C Data sheet ( Hoja de datos )
| Número de pieza | ISL62881C | |
| Descripción | Single-Phase PWM Regulator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Single-Phase PWM Regulator for IMVP-6.5™ Mobile
CPUs and GPUs
ISL62881C, ISL62881D
The ISL62881C provides a complete solution for
microprocessor and graphic processor core power supply
with it’s integrated gate drive. Based on Intersil’s Robust
Ripple regulator (R3™) technology, the PWM modulator
compared to traditional modulators, has faster transient
settling time, variable switching frequency during load
transients and has improved light load efficiency with its
ability to automatically change switching frequency.
Fully compliant with IMVP6.5™, the ISL62881C is easily
configurable as a CPU or graphics VCORE controllers by
offering: responds to DPRSLPVR signals by
entering/exiting diode emulations mode; reports
regulator output current via the IMON pin; senses
current by using a discrete resistor or the inductor;
over-temperature thermal compensation of DCR, using a
single NTC thermistor; differential sensing to accurately
monitor and adjust processor die voltage; minimizes
body diode conduction loss in diode emulation mode with
it’s adaptive body diode conduction time.
Need to aggressively reduce the output capacitor? The
overshoot reduction function is user-selectable and can
be disabled for those concerned about increased system
thermal stress.
Maintaining all the ISL62881C functions, the ISL62881D
offers VR_TT# function for thermal throttling control. It
also offers the split LGATE function to further improve
light load efficiency.
Features
• Precision Core Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- Enhanced Load Line Accuracy
• Supports Multiple Current Sensing Methods
- Lossless Inductor DCR Current Sensing
- Precision Resistor Current Sensing
• Current Monitor
• Differential Remote Voltage Sensing
• Integrated Gate Driver
• Split LGATE Driver to Increase Light-Load Efficiency
(For ISL62881D)
• Adaptive Body Diode Conduction Time Reduction
• User-selectable Overshoot Reduction Function
• Small Footprint 28 Ld 4x4 or 32 Ld 5x5 TQFN
Package
Applications
• Notebook Core Voltage Regulator
• Notebook GPU Voltage Regulator
Related Literature
• See AN1552 for Evaluation Board Application Note
“ISL62881CCPUEVAL2Z User Guide”
• See AN1553 for Evaluation Board Application Note
“ISL62881CGPUEVAL2Z User Guide”
Load Line Regulation
0.91
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
0
VIN = 19V
VIN = 12V
VIN = 8V
2 4 6 8 10 12 14 16 18 20 22
IOUT (A)
March 8, 2010
FN7596.0
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
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
RBIAS ........................................................... 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
5 Page 
ISL62881C, ISL62881D
Simplified Application Circuits (Continued)
V+5 V+5 VIN
RBIAS
VDD VCCP VIN
RBIAS
OC
VR_TT#
PGOOD
CLK_EN#
VID<0:6>
DPRSLPVR
VR_ON
NTC
VR_TT#
PGOOD
CLK_EN#
VIDS
DPRSLPVR
VR_ON
VW
ISL62881D
RFSET
BOOT
UGATE
RDROOP
COMP
FB
PHASE
LGATEB
LGATEA
VSSP
VSEN
ISUM+
VIN
L
RSUM
RSEN
VO
VCCSENSE
VSSSENSE
RIMON
IMON
RTN
IMON
ISUM-
VSS
CN
RI
FIGURE 4. ISL62881D TYPICAL APPLICATION CIRCUIT USING RESISTOR SENSING
11 FN7596.0
March 8, 2010
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISL62881C.PDF ] | |
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