Description
The ISL6266 and ISL6266A are two-phase buck converter regulators implementing Intel IMVP-6 protocol with embedded gate drivers. Both converters use interleaved channels to double the output voltage ripple frequency and thereby reduce output voltage ripple amplitude with fewer components, lower component cost, reduced power dissipation, and smaller real estate area.
The ISL6266A utilizes the patented R3 Technology, Interfiles Robust Ripple Regulator modulator. Compared with traditional multiphase buck regulators, the R3 Technology has the fastest transient response. This is due to the R3 modulator commanding variable switching frequency during load transient events.
Intel Mobile Voltage Positioning (IMVP) is a smart voltage regulation technology, which effectively reduces power dissipation in Intel Pentium processors. To boost battery life, the ISL6266A supports DPRSLRVR (deeper sleep), DPRSTP#, and PSI# functions, which maximizes efficiency by enabling different modes of operation. Inactive mode (heavy load), the regulator commands the two-phase continuous conduction mode (CCM) operation. When PSI# is asserted in active mode (medium load), the ISL6266A operates in one-phase CCM. When the CPU enters deeper sleep mode, the ISL6266A enables diode emulation to maximize efficiency.
For better system power management, the ISL6266A provides a CPU power monitor output. The analog output at the power monitor pin can be fed into an A/D converter to report instantaneous or average CPU power.
A 7-bit digital-to-analog converter (DAC) allows dynamic adjustment of the core output voltage from 0.300V to 1.500V. Over-temperature, the ISL6266A achieves a 0.5% system accuracy of core output voltage.
A unity-gain differential amplifier is provided for remote CPU die sensing. This allows the voltage on the CPU die to be accurately measured and regulated per Intel IMVP-6+ specifications. Current sensing can be realized using either lossless inductor DCR sensing or discrete resistor sensing. A single NTC thermistor network thermally compensates the gain and the time constant of the DCR variations.
Features
– Precision Two/One-phase CORE Voltage Regulator
– 0.5% System Accuracy Over-Temperature
– Enhanced Load Line Accuracy
– Internal Gate Driver with 2A Driving Capability
– Dynamic Phase Adding/Dropping
– Microprocessor Voltage Identification Input
– 7-Bit VID Input
– 0.300V to 1.500V in 12.5mV Steps
– Support VID Change On-the-Fly
– Multiple Current Sensing Schemes Supported
– Lossless Inductor DCR Current Sensing
– Precision Resistive Current Sensing
– CPU Power Monitor
– Thermal Monitor
– User Programmable Switching Frequency
– Differential Remote CPU Die Voltage Sensing
– Static and Dynamic Current Sharing
– Support All Ceramic Output with Coupled Inductor
(ISL6266)
– Overvoltage, Undervoltage and Overcurrent Protection
– Pb-Free (RoHS Compliant)
