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The ISL95833 Pulse Width Modulation (PWM) controller IC
provides a complete solution for IMVP-7/VR12™ compliant
microprocessor and graphic processor core power supplies. It
provides the control and protection for two Voltage Regulators
(VRs). The first VR, typically for VCORE, incorporates 1
integrated driver and can operate in 2- or 1-phase
configurations. The second VR, typically for Graphics, is a
single phase regulator incorporating an integrated driver. The
two VRs share a serial control bus to communicate with the
CPU and achieve lower cost and smaller board area compared
with the two-chip approach.
Both VRs utilize Intersil's Robust Ripple Regulator R3
Technology™. The R3 modulator has numerous advantages
compared to traditional modulators, including faster transient
response, variable switching frequency during load transients,
and improved light load efficiency due to its ability to
automatically change switching frequency.
The ISL95833 has several other key features. Both outputs
support either DCR current sensing with a single NTC
thermistor for DCR temperature compensation, or more
precise resistor current sensing if desired. Both outputs come
with remote voltage sense, programmable VBOOT voltage,
IMAX, and switching frequency, adjustable overcurrent
protection and separate Power-Good signals.
Features
• Serial Data Bus
• Dual Outputs:
- Configurable 2- or 1-phase for the 1st Output using one
Integrated Gate Driver
- 1-phase for the 2nd Output using an Integrated Gate
Driver
• R3 Modulator
- Excellent Transient Response
- 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 VBOOT Voltage at Start-up
• Resistor Programmable IMAX, Switching Frequency for Both
Outputs
• Adaptive Body Diode Conduction Time Reduction
Applications
• IMVP-7/VR12 Compliant Computers
