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MAX8680 業(yè)內(nèi)尺寸最小的7通道DSC電源方案

        
欄目：公司新聞發(fā)布時(shí)間：2008-10-27訪問量：1735次

      

      

        
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.
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    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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