DATA SHORT
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ISL95820
Green Hybrid Digital
Four Phase PWM Controller for Intel VR12.5™ CPUs
The ISL95820 Pulse Width Modulation (PWM) controller IC
provides a complete low-cost solution for Intel VR12.5™
compliant microprocessor core power supplies. It provides the
control and protection for a Voltage Regulator (VR). The VR
incorporates 3 integrated drivers and can operate in 4-, 3-, 2-
or 1-phase configurations. The VR uses a serial control bus to
communicate with the CPU and achieve lower cost and smaller
board area.
The VR utilizes Intersil’s Robust Ripple Regulator R3
Technology™. The R3™ modulator has many advantages
compared to traditional modulators, including faster transient
response, variable switching frequency in response to load
transients, and improved light load efficiency due to diode
emulation mode with load-dependent low switching frequency.
The ISL95820 has several other key features. It supports
either DCR current sensing with a single NTC thermistor for
DCR temperature compensation, or more precise resistor
current sensing if desired; remote voltage sense;
programmable V
BOOT
voltage, I
MAX,
voltage transition slew
rate and switching frequency; adjustable overcurrent
protection; and Power-Good signal.
FN8318
Rev 1.00
October 15, 2013
Features
• Serial data bus
• SMBus/PMBus/I
2
C interface with SVID conflict free
• Configurable 4-, 3-, 2- or 1-phase for the output using three
integrated gate drivers
•
Green Hybrid Digital
R3™ modulator
- Excellent transient response
- Phase shedding with power state selection
- Diode emulation in single-phase for high light-load
efficiency
• 0.5% system accuracy over-temperature
• Supports multiple current sensing methods
- Lossless inductor DCR current sensing
- Precision resistor current sensing
• Differential remote voltage sensing
• Programmable V
BOOT
voltage at start-up
• Resistor programmable I
MAX
, load line, diode emulation,
slope compensation, and switching frequency
• Adaptive body diode conduction time reduction
Applications
• Intel VR12.5 desktop computers
V
IN
PHASE4
INTERSIL
DRIVER
V
IN
V
CORE
PHASE3
ISL95820
V
IN
PHASE2
V
IN
PHASE1
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT
FN8318 Rev 1.00
October 15, 2013
Page 1 of 2
ISL95820
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Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
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For information regarding Intersil Corporation and its products, see
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FN8318 Rev 1.00
October 15, 2013
Page 2 of 2
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