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)