MAX8717E Dual Power-Supply Controllers for Notebook Computers
Description:
The MAX8716 / MAX8717 / MAX8757 are dual, stepdown,interleaved, fixed-frequency, switch-mode power-supply (SMPS) controllers with synchronous rectification.
They are intended for main (5V/3.3V) and I/Opower generation in battery-powered systems.
Fixed-frequency operation with optimal interleaving minimizes input ripple current from the lowest input voltages up to the 26V maximum input. Optimal 40/60 interleaving allows the input voltage to go down to 8.3V before duty-cycle overlap occurs, compared to 180°out-of-phase regulators where the duty-cycle overlap occurs when the input drops below 10V.
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.
A low-noise mode maintains high light-load efficiency while keeping the switching frequency out of the audible range.
The MAX8716 is available in a 24-pin thin QFN package,and the MAX8717/MAX8757 are available in a 28-pin thin QFN package.
Features:
- Fixed 200kHz, 300kHz, or 500kHz Switching Frequency
- No Current-Sense Resistor Required
- 40/60 Optimal Interleaving
- Reduced Input-Capacitor Requirement
- 3.3V and 5V fixed or 1.0V to 5.5V Adjustable Outputs (Dual Mode?)
- 4V to 26V Input Range
- Independently Selectable PWM, Skip, and Low-Noise Mode Operation
- Soft-Start and Soft-Stop
- 2V Precision Reference with 0.75% Accuracy
- Independent Power-Good Outputs
Application:
- 2 to 4 Li+ Cell Battery-Powered Devices
- Notebook and Subnotebook Computers
- PDAs and Mobile Communicators
- Main or I/O Power Supplies
Package included:
- 1 x MAX8717E Dual Power-Supply Controllers for Notebook Computers
