DATASHEET
ISL62881C, ISL62881D
Single-Phase PWM Regulator for IMVP-6.5™ Mobile CPUs and GPUs
FN7596
Rev 0.00
March 8, 2010
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)
FN7596 Rev 0.00
March 8, 2010
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