High-Efficiency, Dual Power-Supply Controller for Notebook Computers
SUNNYVALE, CA-February 22, 2005-Maxim Integrated Products
(NASDAQ: MXIM) introduces the MAX8717, a dual step-down, interleaved, fixed-frequency, switch-mode power-supply (SMPS) controller. Featuring synchronous rectification, the MAX8717 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 minimizes input ripple current from the lowest input voltages up to 26V, and reduces input capacitance requirements. 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, thereby preventing negative voltage dips.
The MAX8717 is available in a 28-pin TQFN package, and is screened for the extended temperature range (-40°C to +85°C). Prices start at $3.85 (1000-up, FOB USA). A preassembled MAX8717 evaluation kit is available with recommended external components to reduce design time.
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