Power Electronics

Step-Down Controller for Notebook CPUs

Maxim Integrated Products introduces the MAX8720 step-down controller, featuring dynamically adjustable output, ultrafast transient response, high dc accuracy, and the high efficiency required for leading-edge CPU-core power supplies. Maxim's proprietary Quick-PWM, constant on-time, pulse-width modulation (PWM) control scheme handles wide-input/output voltage ratios with ease. The Quick-PWM control scheme also provides 100 ns "instant-on" response to load transients, while maintaining a constant switching frequency.

The MAX8720's output voltage is dynamically adjusted through the 6-bit DAC over a 0.275-V to 1.850-V range in 25-mV steps. Independent, 4-level logic inputs set the suspend voltage (S0-S1). The internal DAC is synchronized to the slew-rate clock for improved operation under the aggressive power management of newer chipsets and operating systems that can make incomplete mode transitions.

The MAX8720 is available in a 28-pin QSOP or 36-pin TQFN package, and is screened for the extended temperature range (-40°C to 85°C).

For more information, visit www.maxim-ic.com.

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