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MAX8680 業(yè)內(nèi)尺寸最小的7通道DSC電源方案

2008-10-27 09:14www.elecfans.co 本站我要評論（0）我要收藏

MAX8680 業(yè)內(nèi)尺寸最小的7通道DSC電源方案

MAX8680概述

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. Each converter also features True Shutdown™, as well as internal compensation to minimize external component count. The seven DC-DC converter outputs are:

  • 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.

    The MAX8680 has an independent/simultaneous power-on sequence of the CCDBST and CCDINV converters. For a preset power-on sequence of CCDBST before CCDINV, contact the factory.

    The MAX8680 operates with 1-cell lithium-ion (Li+) battery, two-AA cell, or dual-battery designs and is available in a 5mm x 5mm, 40-pin thin QFN package. The MAX8680 operates over the -40°C to +85°C extended temperature range.

    • MAX8680關(guān)鍵特性

    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 Step-Down Converters
  		• Regulated Current Output for Up to 6 White LEDs
  		• PWM Dimming of WLED Current
  		• Adjustable LED Overvoltage Protection Up to 27V
  		• Transformerless Inverting Converter for CCD
  		• 2MHz Switching Frequency for Low-Voltage Channels
  		• ±2.5% Switching Frequency Accuracy
  		• 1µA Shutdown Supply Current
  		• Power-On Voltage Tracking for Core and Main Outputs
  		• All Internal Power MOSFETs
  		• Active-Low SDOK Power-OK Indicator

    MAX8680應(yīng)用/使用

    DSC和DVC
  		•  GPS導(dǎo)航系統(tǒng)
  		•  PDAs and Portable Media Players

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