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PWM controllers deliver 'fastest' transient response

Posted: 28 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Intersil? ISL6312? ISL6312A? ISL6322? PWM buck controller. PWM controller?

Intersil's PWM buck controllers

Intersil Corp. has introduced a new family of four-phase synchronous pulse width modulation (PWM) buck controllers. These devices promise the fastest transient response with the fewest output capacitors, the company said, and provide the industry's most integrated and cost-efficient computing power management solution.

The ISL6312, ISL6312A and ISL6322 provide a complete, integrated precision voltage regulation system for advanced Intel VR10/11(Intel Core 2 Duo and Intel Core 2 Extreme) and AMD AM2 5/6bit microprocessors, Intersil said. This family features programmable voltage identification (VID) codes for Intel and AMD DAC tables.

According to Intersil, these devices use the company' proprietary active pulse positioning (APP) and adaptive phase alignment (APA) modulation schemes to achieve the industry's fastest transient response with the fewest output capacitors over competitive designs. APP and APA are pulse width and 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 is said to be 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 new PWM controllers deliver the industry's highest performance/price ratio for three- and four-phase CPU core regulators," said George Lakkas, senior product marketing manager for Intersil's 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."

Precision and integration
The ISL6312, ISL6312A and ISL6322 provide advanced control loop features to optimize transient response to load-apply and removal functions. These include highly accurate and fully differential continuous DC resistance current sensing for load line programming and channel current balance. These features also ensure individual channel current and average overcurrent protection. These devices incorporate key features developed by Intersil specifically for these applications, including active pulse positioning modulation, enabling rapid initial response to high slew rate load transients. The ISL6312/12A/22 also include adaptive phase alignment that enables the fastest possible load transient response with capacitor elimination when there is a severe load turn-on, Intersil explained.

The ISL6312A incorporates an added IOUT pin to the basic ISL6312 architecture for output current measurement. The ISL6322 provides an I?C bus input for adjusting four basic regulator functions, such as the output voltage, overvoltage protection level, operating frequency per phase, and MOSFET driver adaptive dead time control. This family promises sophisticated overvoltage, undervoltage and overcurrent protection. Additionally, the ISL6312/12A/22 include open circuit protection on the remote sensing inputs.

The ISL6312, ISL6312A and ISL6322 are available in space-saving, 48-lead, 7-by-7mm QFN packages with prices ranging form $6.67 to $7.42 each in 1,000-piece quantities.

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