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DATASHEET

To request the full datasheet, please visit www.intersil.com/products/isl95858

3+2 Multiphase PWM Regulator for Intel IMVP8™

Desktop CPUs

ISL95858

Compliant with Intel IMVP8™, the ISL95858 provides a

complete power solution for desktop microprocessors

supporting both the core (IA) and graphics (GT) rails. The

controller provides control and protection for one voltage

regulator (VR), which can be configured for 3-, 2- or 1-phase

operation. The second VR is configurable for 2- or 1-phase

operation. The VRs feature a programmable SVID address to

allow maximum flexibility in supporting desktop processor SKUs.

Both controller outputs share a common serial control bus to

communicate with the CPU and achieve lower cost and smaller

board area compared with a two-chip approach.

Based on Intersil’s robust ripple regulator R3™ technology, the

R3™ modulator has many advantages compared to traditional

modulators. These include faster transient settling time,

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 ISL95858 has several other key features. The controller

features three integrated +12V gate drivers with two drivers on

the VR B output. The controller supports either DCR current

sensing with a single NTC thermistor for DCR temperature

compensation or more precision through resistor current

sensing if desired. Both outputs feature remote voltage sense,

protection and single VR_READY power-good indicator.

Features

• Supports Intel serial data bus interface

- Excellent transient response

- Phase shedding with power state selection

- Diode emulation in single-phase for high light-load

efficiency

• Dual output controller

- Voltage regulator A: 3-, 2-, or 1-phase designs with two

+12V integrated gate drivers

- Voltage regulator B: 2-, or 1-phase designs with one +12V

integrated gate driver

• 0.5% system accuracy over-temperature

• Supports multiple current sensing methods

- Lossless inductor DCR current sensing

- Precision resistor current sensing

• Differential remote voltage sensing

switching frequency for both outputs

• Adaptive body diode conduction time reduction

Applications

• IMVP8™ compliant desktops

FIGURE 1. VR A EFFICIENCY vs LOAD

FIGURE 2. VR B EFFICIENCY vs LOAD

LOAD CURRENT (A)

40

50

60

70

80

90

100

0

10

2030

405060

PS0

PS1

PS2

LOAD CURRENT (A)

40

50

60

70

80

90

100

0

5

10

15

20

25

30

35

PS2/3

PS1

PS0

July 2, 2015

FN8739.1

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.