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Dual power-supply controller for notebooks

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article image Minimises input ripple current from the lowest input voltages up to 26V.

MAXIM Integrated Products, represented in Australia by Arrow Electronics , has released the MAX8717, a dual step-down, interleaved, fixed-frequency, switch-mode power-supply (SMPS) controller. It has synchronous rectification and is intended for main (5V/3.3V) and I/O power generation in battery-powered systems and notebook computers.

The MAX8717's fixed-frequency operation with optimal interleaving minimises input ripple current from the lowest input voltages up to 26V and reduces input capacitance requirements. An accurate output current limit is achieved using a sense resistor. Alternatively, power dissipation can be reduced using lossless inductor current sensing. Independent on/off controls and power good signals allow flexible power sequencing. Soft start reduces inrush current, while soft stop gradually ramps the output voltage down, preventing negative voltage dips. The MAX8717 is available in a 28-pin TQFN package and is screened for the extended temperature range from -40ºC to 85ºC. A preassembled MAX8717 evaluation kit is available with recommended external components to reduce design time.

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