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MAX1912 - 1.5x/2x High-Efficiency White LED Charge Pumps

General Description

The MAX1910/MAX1912 power LEDs with a regulated output voltage or current (up to 120mA) from an unregulated input supply (2.7V to 5.3V).

These are complete DC-DC converters requiring only four small ceramic capacitors and no inductors.

Key Features

  • High-Efficiency 1.5x/2x Charge Pumps.
  • Low Input Ripple with 750kHz Operation.
  • 200mV Current-Sense Threshold Reduces Power Loss.
  • Current- or Voltage-Regulated Charge Pump.
  • Up to 120mA Output Current.
  • No Inductors Required.
  • Small Ceramic Capacitors.
  • Regulated ±5% LED Current.
  • Load Disconnected in Shutdown.
  • 1µA Shutdown Current.
  • Small 10-Pin µMAX Package MAX1910/MAX1912.

📥 Download Datasheet

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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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19-2290; Rev 2; 3/04 1.5x/2x High-Efficiency White LED Charge Pumps General Description The MAX1910/MAX1912 power LEDs with a regulated output voltage or current (up to 120mA) from an unregulated input supply (2.7V to 5.3V). These are complete DC-DC converters requiring only four small ceramic capacitors and no inductors. Input ripple is minimized by a unique regulation scheme that maintains a fixed 750kHz switching frequency over a wide load range. Also included are logic-level shutdown and soft-start to reduce input current surges at startup. The MAX1910 has two automatically selected operating modes: 1.5x and 2x. 1.5x mode improves efficiency at higher input voltages, while 2x mode maintains regulation at lower input voltages. The MAX1912 operates only in 1.5x mode.