Milpitas, Calif.—Intersil bills its ISL6316 as the most accurate multiphase core controller in the industry for maintaining a tighly regulated output voltage versus load current and temperature. The company says it's the only VR10.X and EVRD10.X CPU core controller with tracking over-current protection based on a single, external NTC (negative temperature coefficient) thermistor. An addition to the company's portfolio of PWM controllers, the chip, which drives up to four synchronized buck regulator channels in parallel for Intel-based VRD (voltage regulator down) 10.X and EVRD (enterprise voltage regulator down) 10.X desktop, workstation, and server motherboards, touts a system accuracy of ±0.5 percent over the CPU's voltage range and system life, load, and temperature.
"The current limit threshold of the ISL6316 is the same either at room temperature or at elevated temperatures inside a system chassis," said George Lakkas, senior product marketing manager of the Power Management group. "This offers significant improvements in reliability in mission-critical applications, such as servers, routers, switchers, or storage area network (SAN) and network attached storage (NAS) systems. The system designer can program the ISL6316, for example, to respond to an overload of 130 amps at an (programmable) ambient temperature of +25°C and know that it will have the same current limit threshold of 130 amps at an ambient temperature of +60°C.”
Current- and voltage-monitoring proceeds on several levels. The chip delivers tight phase-to-phase current balance and loadline accuracy by means of differential current sensing, and very precise voltage regulation through differential voltage sensing. Differential current sensing (measuring the current through the current sense element—either the RDS of the lower MOSFET or the resistance of the output inductor) minimizes current measurement inaccuracies due to the printed circuit board layout. The ISL6316 features adjustable precision reference voltage offset for precise loadline programming. The offset pin allows accurate voltage offset settings that are independent of the voltage identification (VID) setting.
If the voltage regulator overheats, the controller will alert the CPU to the condition, and the processor will cut back on its power draw. The ISL6316 can also turn on a system fan signal to cool the CPU, or detect when the CPU overheats and initiate a shutdown signal. The chip is suitable for pairing with the company's ISL6612/12A/13/13A/14/14A and ISL6605/08 FET drivers. Dynamic VID technology allows seamless VID changes.
The ISL6316, available in a 40-lead QFN standard or lead-free package, is priced at $2.55 each in 1k quantities. Additional information is available by clicking here.
Intersil Corp., 1-888-468-3774,