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发布者:微桥 发布时间:2011/7/9 阅读:6175次    关键字: EMH7020 EMH7021 DC-DC ESMT
EMH7020-500mA PWM Synchronous Boost Converter


 
General Description
    The EMH7020 is a high efficiency, synchronous fixed frequency, current-mode step-up DC/DC converter. During shutdown mode, the output is completely isolated from the input without drawing any battery current. The fixed 500KHz switching frequency obtains maximum efficiency up to 96% and uses only a few external components. With 180Ω loading, the minimum start-up voltage can be as low as 0.93V, provided by a one or two-cell alkaline or one-cell Li-Lon battery. The features of EMH7020 include current limit, low battery comparator, open-drain power good output, short circuit, and thermal shutdown protection. The EMH7020 is also available in 3X3mm TDFN-10 package.
 
Applications
  Mobile Phone
  Digital Still Cameras
  Portable applications
  MP3 Players
  GPS Receivers
 
Features
  Up to 96% efficiency
  Reference voltage: 0.5V
  Output to input disconnect at shutdown mode
  500mA current delivery
  Switch current limit protection
  500KHz fixed switching frequency
  Thermal shutdown protection
  0.5V Low-battery comparator
  Min-start up voltage: 0.93V
  Low quiescent current: 50uA (Tpy.)
  Low shutdown current < 1uA
  TDFN 3x3mm 10 pins package
 
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