Power Electronics

Parallel Controllers Support On-the-fly VID changes

Intersil’s family of pulse-width modulation (PWM) controllers provide microprocessor core voltage regulation by driving four to six synchronous-rectified buck channels in parallel. The ISL6326, ISL6326B and ISL6327 use Intersil’s active pulse positioning (APP) and adaptive phase alignment (APA) modulation scheme to achieve fast transient response with few output capacitors. A unity gain, differential amplifier is provided for remote voltage sensing.

The devices have ±0.5% system accuracy over life, load, line and temperature. They also feature an adjustable precision reference voltage offset.

The ISL6326 and ISL6326B are 4-phase PWM controllers with an 8-bit DAC code for precision dedicated current-sense resistance (DCR). The ISL6326B offers an output current pin that enables continuous power monitoring. The ISL6327 is a 6-phase PWM controller with an 8-bit VID code and differential inductor DCR or resistor current sensing. The ISL6327 also offers an output current pin.

A programmable integrated temperature compensation function is implemented to effectively compensate for the temperature coefficient of the current sense element. The current limit function provides the overcurrent protection for the individual phases.

The threshold-sensitive enable input is available to accurately coordinate the start-up of these devices with any other voltage rail. Dynamic-VID technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting.

The ISL6326 and ISL6326B are available in 40-lead QFNs and are priced at $3.81 and $4.03 respectively. The ISL6327 is available now in a 48-lead QFN and is priced at $4.58. All pricing is in 1000-unit quantities.

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