Description
The ISL95836 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, typical for Vcore, incorporates 2 integrated drivers and can operate in 3-, 2- or 1-phase
configurations. The second VR, typical for Graphics, incorporates 1 integrated driver and can operate in 2- or 1-phase
configurations. 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 Intersils 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 ISL95836 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.
Key Features
Serial Data Bus
Dual Outputs:
Configurable 3-, 2- or 1-phase for the 1st Output using two integrated Gate Drivers
Configurable 2- or 1-phase for the 2nd Output using one 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