Overview: DATASHEET ISL9506
Multiphase PWM Controller with Programmable Output Voltage FN6722 Rev 0.00 August 13, 2008 The ISL9506 is a multiphase PWM buck controller for high performance digital processor core. This multiphase buck controller uses interleaved channels to reduce the total output voltage ripple with each channel carrying a portion of total load current. The multiple phase implementation results in better system performance, superior thermal management, lower component cost, reduced power dissipation, and smaller implementation area. The ISL9506 multiphase controller together with ISL6208 external gate drivers provide a complete solution to power the processor core. The PWM modulator of ISL9506 is based on Intersil's Robust Ripple Regulator technology (R3). Compared with the traditional multiphase buck regulator, the R3 modulator commands variable switching frequency during load transients, which achieves faster transient response. With the same modulator, the switching frequency is reduced at light load conditions resulting higher operation efficiency. ISL9506 responds to LP (Low Power) signal by adding or dropping PWM2 and adjusting overcurrent protection accordingly. ISL9506 enables diode emulation and stretches switching period at light load conditions to improve efficiency. The diode emulation feature is programmed by DE_EN (Diode Emulation Enable) and DE_ENN pins.
