The ISL6260B is a multiphase regulator that uses external drivers and can be programmed as 1-, 2-, or 3-phase. When combined with the ISL6208 gate driver, the ISL6260B forms the basis for a portable power supply system to power Intel’s latest CPU aimed a notebook computers, blade servers, and networked storage devices.
Phase-dropping allows the device to be configured to alternate phases (2-phase to 1-phase, or 3-phase to 2-phase). The dynamic phase add-drop feature together with diode emulation mode at light load on the ISL6260B and ISL6262 maximize the efficiency over a wide load range to improve battery life.
The modulator at the heart of this power system is created using Intersil's Robust Ripple Regulator (R3) technology. Compared with traditional multiphase buck regulators, R3-based converters have faster transient response due to the modulator commanding variable switching frequency during load transients. At heavy load operation in the active mode, the regulators command continuous conduction mode (CCM) operation. When the CPU enters deeper sleep mode, the ISL6260B and ISL6262 enable diode emulation to maximize efficiency during the light load.
Key features include 0.5% system accuracy over temperature, enhanced loadline accuracy, 7-bit VID (voltage identification) input, and 0.300 to 1.500 V in 12.5-mV steps. The ISL6260B is available in a 40-lead QFN standard or lead-free package and is priced at $3.80. The ISL6262 is housed in a 48-lead QFN package and is priced at $4.00. More information on both parts is available at www.intersil.com.