Milpitas, Calif.—Intersil's "all-in-one-VID" four-phase PWM buck controllers claim the industry's fastest response and highest system accuracy for Intel Core 2 Duo, Intel Core 2 Extreme, and AMD AM3 motherboards.
"Intersil's new PWM controllers deliver the industry's highest performance/price ratio for four-phase CPU core regulators," said George Lakkas, senior product marketing manager for the Computing Power products group. Intel VR10/11 and AMD AM2 CPU core solutions using Intersil's advanced controllers meet specs with substantially fewer bulk output capacitors than competitive offerings. Additionally, Intersil offers family variations for many popular computing applications. For example, the ISL6312A enables customers to monitor the CPU load current in real-time for improved reliability, while the ISL6322 is optimized specifically to work with overclocking applications such as performance motherboards using Intel's Core 2 Extreme processor."
These devices use the company's proprietary active pulse positioning (APP) and adaptive phase alignment (APA) modulation schemes to claim the industry's fastest transient response with the fewest output capacitors over competitive designs. APP and APA are pulse-width and pulse-positioning modulation techniques that speed up load transient response and reduce the need for external bulk output capacitors required to supply stored energy to the CPU during abrupt changes in line voltage and load current.
All three devices incorporate a unity-gain differential amplifier for remote voltage sensing that compensates for differences between remote and local grounds. The ISL6312/12A/22 also integrate three MOSFET drivers and a PWM output for a fourth external MOSFET driver. This configuration reportedly provides the industry's most integrated and cost-efficient power management solution for desktops, workstations, servers, industrial PC motherboards, routers, switches and voltage regulator modules.
The ISL6312, ISL6312A and ISL6322 include highly accurate and fully differential continuous DCR (DC resistance) current sensing for load line programming and channel current balance. These features also ensure individual channel current and average over-current protection (OCP). Active pulse positioning (APP) modulation enables rapid initial response to high slew rate (di/dt) load transients. Adaptive phase alignment (APA) enables the fastest possible load transient response when there is a severe load turn-on.
The ISL6312A incorporates an added IOUT pin to the basic ISL6312 architecture for output current measurement. The ISL6322 provides an I2C bus input for adjusting four basic regulator functions, such as the output voltage, over-voltage protection (OVP) level, operating frequency per phase, and MOSFET driver adaptive dead-time control. This family features sophisticated over-voltage, undervoltage, and overcurrent protection. Additionally, the ISL6312/12A/22 include open circuit protection on the remote sensing inputs.
Click here, here, and here for additional product information. The ISL6312, ISL6312A, and ISL6322, in 48-lead, 7-by-7 mm QFN packages, are priced beginning at $6.67 each and range to $7.42 each in 1,000-piece quantities.
A large selection of power products is supported by Intersil's iSim online design tool; click here. Click here for Intersil's Application Design Center.
Intersil, 1-888-INTERSIL, www.intersil.com