The ISL6312A four-phase PWM control IC provides a

precision voltage regulation system for advanced

microprocessors. The integration of power MOSFET drivers

into the controller IC marks a departure from the separate

PWM controller and driver configuration of previous

multiphase product families. By reducing the number of

external parts, this integration is optimized for a cost and

space saving power management solution.

One outstanding feature of this controller IC is its

multi-processor compatibility, allowing it to work with both

Intel and AMD microprocessors. Included are programmable

VID codes for Intel VR10, VR11, as-well-as AMD DAC

tables. A unity gain, differential amplifier is provided for

remote voltage sensing, compensating for any potential

difference between remote and local grounds. The output

voltage can also be positively or negatively offset through

the use of a single external resistor.

The ISL6312A also includes advanced control loop features

for optimal transient response to load apply and removal.

One of these features is highly accurate, fully differential,

continuous DCR current sensing for load-line programming

and channel current balance. Active pulse positioning (APP)

modulation is another unique feature, allowing for quicker

initial response to high di/dt load transients.

This controller also allows the user the flexibility to choose

between PHASE detect or LGATE detect adaptive deadtime

schemes. This ability allows the ISL6312A to be used in a

multitude of applications where either scheme is required.

Protection features of this controller IC include a set of

sophisticated overvoltage, undervoltage, and overcurrent

protection. Furthermore, the ISL6312A includes protection

against an open circuit on the remote sensing inputs.

Combined, these features provide advanced protection for

the microprocessor and power system.

Features

• Integrated multiphase power conversion

- 2-phase or 3-phase operation with internal drivers

- 4-phase operation with external PWM driver signal

• Precision core voltage regulation

- Differential remote voltage sensing

- 0.5 system accuracy over-temperature

- Adjustable reference-voltage offset

• Optimal transient response

- Active pulse positioning (APP) modulation

- Adaptive phase alignment (APA)

• Fully differential, continuous DCR current sensing

- Accurate load-line programming

- Precision channel current balancing

• User selectable adaptive deadtime scheme

- PHASE detect or LGATE detect for application flexibility

• Variable gate drive bias: 5V to 12V

• Multi-processor compatible

- Intel VR10 and VR11 modes of operation

- AMD mode of operation

• Microprocessor voltage identification inputs

- 8-bit DAC

- Selectable between intel’s extended VR10, VR11, AMD

5-bit, and AMD 6-bit DAC tables

- Dynamic VID technology

• Overcurrent protection

• Load current indicator

• Multi-tiered overvoltage protection

• Digital soft-start

• Selectable operation frequency up to 1.5MHz per phase

• Pb-free (RoHS compliant)