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AIC1841

High Efficiency 1.5x PWM Charge Pump For 4 White LEDs Backlighting

FEATURES
  • 1MHz Switching Frequency
  • 2.7V to 5.5V Input Voltage Range
  • Low Shutdown Current: ≦1μA
  • Regulated 20mA Full-Scale Output Current
  • 32-Position Linear Scale with Digital Control
  • High Accuracy Brightness Matching
  • 33% Less Input Current Than Doubler Charge Pump
  • No Inductors Required
  • Build-in Soft-Start
  • Current Limit and Over Temperature Protection
  • 12-Pin (AIC1841) and 16-Pin (AIC1842) QFN Package
APPLICATIONS
  • Cellular Phones
  • PDAs
  • Digital Still Cameras
  • Handheld Devices
  • White LED Backlighting
DESCRIPTION
The AIC1841 and AIC1842 provide 4 and 6 LED current source outputs with regulated constant current for uniform intensity. The AIC1841/2 is the low noise, constant frequency charge pump DC/DC converter that uses 1.5X conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. Low external parts counts (two 1uF flying capacitors and two small bypass capacitors at VIN, and OUT) make the AIC1841/2 ideal for small, battery-powered applications.
EN/SET interface is used to enable, disable and set the LED current for a 32 level logic scale LED brightness control. Built-in current limiting, with thermal shutdown provide protection to the AIC1841/2 against fault conditions. Automatic soft-start circuitry prevents excessive inrush current during start-up. 1MHz high switching frequency is enable to use tiny external components.
The AIC1841 is available in a 12-pin thin QFN package, and the AIC1842 is available in a space-saving 16-pin QFN package.
TYPICAL APPLICATION


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