MAX8680
Overview
The MAX8680 highly efficient complete power-supply solution is designed for digital still cameras (DSCs) and digital video cameras (DVCs). The device integrates seven on-chip power MOSFET DC-DC converters with up to 95% efficiency to power all critical power supplies in DSC systems.
- Step-up synchronous-rectified DC-DC converter (SU). The MAX8680 is bootstrapped from VSU. * *
- MAIN synchronous-rectified step-down DC-DC converter (M) for DSP I/O supply voltage. DDRZ synchronous-rectified step-down DC-DC converter (Z) for DSP DDR supply voltage. Low-voltage (down to 1V) synchronous-rectified step-down DC-DC converter (SD) for DSP core supply voltage. High-voltage, step-up DC-DC converter with current regulation and PWM dimming control (LEDBST) for white LEDs (WLED). High-voltage step-up DC-DC converter (CCDBST) for CCD imagers or positive LCD bias supplies. Transformerless inverting DC-DC converter (CCDINV) for CCD imagers or negative LCD bias supplies. Features
- 95% Efficient Synchronous-Rectified DC-DC Converters
- 90% Efficient Boost-Buck Operation
- 85% Efficient DC-DC Converters for CCD, LCD, WLED, and/or OLED
- Internal Compensation on All Channels
- True Shutdown on All Step-Up Converters
- Overload Protection
- Soft-Start for Controlled Startup Current
- Dropout Operation (100% Duty Cycle) on StepDown Converters
