The ISL6313B two-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

multi-phase 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

multiprocessor compatibility, allowing it to work with both Intel

and AMD microprocessors. Included are programmable VID

codes for Intel VR11 as well as AMD 5-bit and 6-bit DAC tables.

A circuit 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 ISL6313B 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 and Adaptive Phase Alignment (APA) are two

other unique features, allowing for quicker initial response to

high di/dt load transients. With this quicker initial response to

load transients, the number of output bulk capacitors can be

reduced, helping to reduce cost.

Integrated into the ISL6313B are user programmable current

sense resistors, which require only a single external resistor

to set their values. No external current sense resistors are

required. Another unique feature of the ISL6313B is the

addition of a dynamic VID compensation pin that allows

optimizing compensation to be added for well controlled

dynamic VID response.

Protection features of this controller IC include a set of

sophisticated overvoltage, undervoltage, and overcurrent

protection. Furthermore, the ISL6313B 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 Multi-Phase Power Conversion

- 2-Phase or 1-Phase Operation with Internal Drivers

? 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

- Integrated Programmable Current Sense Resistors

- Accurate Load Line Programming

- Precision Channel Current Balancing

? Variable Gate Drive Bias: 5V to 12V

? Multi-Processor Compatible

- Intel VR11 Mode of Operation

- AMD Mode of Operation

? Microprocessor Voltage Identification Inputs

- 8-Bit DAC

- Selectable between Intel VR11, AMD 5-bit, and AMD

6-bit DAC tables

- Dynamic VID Technology

? Dynamic VID Compensation

? Overcurrent Protection

? Multi-tiered Overvoltage Protection

? Digital Soft-Start

? Selectable Operation Frequency up to 1.5MHz Per Phase

? Pb-Free (RoHS Compliant)