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MAX1577Y - 1.2A White LED Regulating Charge Pump

General Description

The MAX1577Y/MAX1577Z charge pumps drive white LEDs, including camera strobes, with regulated current up to 1.2A (guaranteed to 800mA).

The very low openloop output resistance allows high flash brightness, even from a low battery input voltage.

Key Features

  • Up to 1.2A Output Drive Capability (800mA Guaranteed).
  • Up to 92% PLED / PBATT Efficiency for Movie Mode.
  • Flexible Brightness Control Two-Bit Logic for 100%, 33%, 20%, and Off PWM for 20% to 100%.
  • 3% Current Regulation Over Line and Temperature.
  • Current or Voltage Regulation for Flash and Backlighting (MAX1577Y).
  • Current Regulation for Flash (MAX1577Z).
  • Low Ripple and EMI.
  • 2.7V to 5.5V Supply Voltage Range.
  • Soft-Sta.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-3461; Rev 0; 11/04 ILABLE N KIT AVA IO T A U L A EV www.DataSheet4U.com 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights General Description The MAX1577Y/MAX1577Z charge pumps drive white LEDs, including camera strobes, with regulated current up to 1.2A (guaranteed to 800mA). The very low openloop output resistance allows high flash brightness, even from a low battery input voltage. The adaptive 1x/2x regulating charge-pump operation provides high efficiency (up to 92%) while in movie mode or backlighting. Fast (1MHz) switching allows the use of tiny external components. The MAX1577Y/MAX1577Z use an external resistor to set the full-scale LED current.