1

Dual 3+1 PWM Controller with Current Monitor for

IMVP-7/VR12™ CPUs

ISL95839

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

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.

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 ISL95839 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

protection and separate Power-Good signals.

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

outputs

• Output current monitor (IMON and IMONG)

• Adaptive body diode conduction time reduction

Applications

• IMVP-7/VR12 compliant computers

FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT

FIGURE 2. LOAD LINE REGULATION

ISL6208B

DRIVER

ISL95839

VR2

Vin

VR1

Vin

Vin

Vin

0.80

0.81

0.82

0.83

0.84

0.85

0.86

0.87

0.88

0.89

0.90

0.91

30

36

42

48

54

60

66

0

6

12

18

24

May 9, 2013

FN8315.0

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) and R3 Technology™ are trademarks owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.