Single-Phase PWM Regulator for IMVP-6.5™ Mobile
CPUs and GPUs
ISL62881C, ISL62881D
The ISL62881C provides a complete solution for
Features
• Precision Core Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- Enhanced Load Line Accuracy
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.
• Supports Multiple Current Sensing Methods
- Lossless Inductor DCR Current Sensing
- Precision Resistor Current Sensing
• Current Monitor
Fully compliant with IMVP6.5™, the ISL62881C is easily
• Differential Remote Voltage Sensing
• Integrated Gate Driver
configurable as a CPU or graphics V
offering: responds to DPRSLPVR signals by
controllers by
CORE
• Split LGATE Driver to Increase Light-Load Efficiency
(For ISL62881D)
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.
• 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
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.
• Notebook GPU Voltage Regulator
Related Literature
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.
• 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
V
= 19V
IN
V
= 12V
IN
V
= 8V
IN
0
2
4
6
8
10 12 14 16 18 20 22
(A)
I
OUT
March 8, 2010
FN7596.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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