ISL6556B is a 6-bit DAC optimized multi-phase PWM controller with programmable internal temperature compensation for VR10.X application
The ISL6556B is an optimized multi‑phase PWM controller designed for microprocessor core voltage regulation. It drives up to four synchronous‑rectified buck channels in parallel, using interleaved timing to reduce ripple and improve efficiency. The device features a 6‑bit VID input, programmable internal temperature compensation, and a remote‑sense differential amplifier for precise voltage sensing.
The datasheet provides full electrical specifications, pin‑out diagrams, package options (28‑lead SOIC and 32‑lead QFN), ordering information, and typical application circuits. It also outlines protection features such as over‑current, over‑voltage, and threshold enable functions, and confirms RoHS‑compliant, Pb‑free versions are available.
| Supply Voltage (VCC) | 5 V (typical) |
|---|---|
| Input/Output Voltage Range | GND‑0.3 V to VOC + 0.3 V |
| VID Input Range | 0.8375 V to 1.600 V in 12.5 mV steps |
| Number of Phases | Up to 4 phases |
| Oscillator Adjustment Range | 0.08 MHz to 1.5 MHz |
| Offset Pin Voltage | 485 mV–515 mV (ground reference) or 2.91 V–3.09 V (VCC reference) |
The VID input ranges from 0.8375 V to 1.600 V in 12.5 mV steps.
It supports 2, 3, or 4 phase operation.