ISL62883C Datasheet, PDF (1/43 Pages) Intersil Corporation – Multiphase PWM Regulator for IMVP-6.5™ Mobile CPUs and GPUs

Multiphase PWM Regulator for IMVP-6.5™ Mobile
CPUs and GPUs
ISL62883C
The ISL62883C is a multiphase PWM buck regulator for
miroprocessor or graphics processor core power supply.
The multiphase buck converter uses interleaved phase to
reduce the total output voltage ripple with each phase
carrying a portion of the total load current, providing
better system performance, superior thermal
management, lower component cost, reduced power
dissipation, and smaller implementation area. The
ISL62883C uses two integrated gate drivers and an
external gate driver to provide a complete solution. The
PWM modulator is based on Intersil's Robust Ripple
Regulator (R³) technology™. Compared with traditional
modulators, the R³â„¢ modulator commands variable
switching frequency during load transients, achieving
faster transient response. With the same modulator, the
switching frequency is reduced at light load, increasing
the regulator efficiency.
The ISL62883C can be configured as CPU or graphics
Vcore controller and is fully compliant with IMVP-6.5™
specifications. It responds to PSI# and DPRSLPVR signals
by adding or dropping PWM3 and Phase 2 respectively,
adjusting overcurrent protection threshold accordingly,
and entering/exiting diode emulation mode. It reports
the regulator output current through the IMON pin. It
senses the current by using either discrete resistor or
inductor DCR whose variation over temperature can be
thermally compensated by a single NTC thermistor. It
uses differential remote voltage sensing to accurately
regulate the processor die voltage. The adaptive body
diode conduction time reduction function minimizes
the body diode conduction loss in diode emulation
mode. User-selectable overshoot reduction function
offers an option to aggressively reduce the output
capacitors as well as the option to disable it for users
concerned about increased system thermal stress. In
2-Phase configuration, the ISL62883C offers the FB2
function to optimize 1-Phase performance.
Features
• Programmable 1, 2- or 3-Phase CPU or GPU Mode of
Operation
• Precision Multiphase Core Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- Enhanced Load Line Accuracy
• Microprocessor Voltage Identification Input
- 7-Bit VID Input, 0V to 1.500V in 12.5mV Steps
- Supports VID Changes On-The-Fly
• Supports Multiple Current Sensing Methods
- Lossless Inductor DCR Current Sensing
- Precision Resistor Current Sensing
• Supports PSI# and DPRSLPVR modes
• Superior Noise Immunity and Transient Response
• Current Monitor and Thermal Monitor
• Differential Remote Voltage Sensing
• High Efficiency Across Entire Load Range
• Two Integrated Gate Drivers
• Excellent Dynamic Current Balance
• FB2 Function Optimizes 1-Phase Mode Performance
• Adaptive Body Diode Conduction Time Reduction
• User-selectable Overshoot Reduction Function
• Small Footprint 40 Ld 5x5 TQFN Packages
• Pb-Free (RoHS Compliant)
Applications*(see page 42)
• Notebook Core Voltage Regulator
• Notebook GPU Voltage Regulator
Related Literature*(see page 42)
• See AN1460 for ISL62883/ISL62883C Evaluation
Board Application Note “ISL62883EVAL2Z User
Guide”
Load Line Regulation
1.10
1.08
1.06
V_IN = 8V
1.04
V_IN = 12V
1.02
V_IN = 19V
1.00
0.98
0.96
0.94
0.92
0
5 10 15 20 25 30 35 40 45 50 55 60 65
I_OUT (A)
March 18, 2010
FN7557.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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