Dual 3+1 PWM Controller with Current Monitor for IMVP-7/VR12™ CPUs

The ISL95839 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. 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.

Features

• Serial data bus

• Dual outputs:

- Configurable 3-, 2- or 1-phase for the 1st output using two integrated gate drivers

- 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 VBOOTvoltage at start-up

• Resistor programmable IMAX, switching frequency for both outputs

• Output current monitor (IMON and IMONG)

• Adaptive body diode conduction time reduction

Applications

• IMVP-7/VR12 compliant computers