ISL6566A

Features:

Integrated Multi-Phase Power Conversion
- 1 or 2-Phase Operation with Internal Drivers
- 3-Phase Operation with External PWM Driver Sign
Precision Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Temperature
- Adjustable Reference-Voltage Offset
Precision Channel Current Sharing
- Uses Loss-Less r_DS(ON)Current Sampling
Accurate Load Line Programming
- Uses Loss-Less Inductor DCR Current Sampling
Variable Gate Drive Bias: 5V to 12V
Microprocessor Voltage Identification Inputs
- Up to a 6-Bit DAC
- Selectable between Intel's VRM9, VRM10, or AMDHammer DAC codes
- Dynamic VID-on-the-fly Technology
Multi-tiered Overvoltage and Overcurrent Protection
Digital Soft-Start
Selectable Operation Frequency up to 1.5MHz Per Phase
Pb-Free Plus Anneal Available (RoHS Compliant)

Pinout






Specifications

Supply Voltage, V_CC. . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +6V
Supply Voltage, PVCC. . . . . . . . . . . . . . . . . . . . . .-0.3V to +15V
Absolute Boot Voltage, V_BOOT. . . . . . .GND - 0.3V to GND + 36V
Phase Voltage, V_PHASE. . . . . . . . GND - 0.3V to 15V (PVCC = 12)
GND - 8V (<400ns, 20J) to 24V (<200ns, V_BOOT-PHASE = 12V)
Upper Gate Voltage, V_UGATE . . . . V_PHASE- 0.3V to V_BOOT+ 0.3V
V_PHASE- 3.5V (<100ns Pulse Width, 2J) to V_BOOT+ 0.3V
Lower Gate Voltage, V_LGATE. . . . . . . GND - 0.3V to PVCC + 0.3V
GND - 5V (<100ns Pulse Width, 2J) to PVCC+ 0.3V
Input, Output, or I/O Voltage . . . . . . . GND - 0.3V to VCC + 0.3V
ESD Classification. . . . . . . . . . . . . . . . . . . . . . .Class I JEDEC STD

Description

The ISL6566A three-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. Outstanding features of this controller IC include programmable VID codes compatible with Intel VRM9, VRM10, as well as AMD Hammer microprocessors. 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. A unique feature of the ISL6566A is the combined use of both DCR and rDS(ON) current sensing. Load line voltage positioning (droop) and overcurrent protection are accomplished through continuous inductor DCR current sensing, while rDS(ON) current sensing is used for accurate channel-current balance. Using both methods of current sampling utilizes the best advantages of each technique. Protection features of this controller IC include a set of sophisticated overvoltage, undervoltage, and overcurrent protection. Overvoltage results in the converter turning the lower MOSFETs ON to clamp the rising output voltage and protect the microprocessor. The overcurrent protection level is set through a single external resistor. Furthermore, the ISL6566A includes protection against an open circuit on the remote sensing inputs. Combined, these features provide advanced protection for the microprocessor and power system.