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AIC3643

Built-in OVP White LED Step-Up Converter

FEATURES
  • Built-In Open Circuit Protection
  • Over Voltage Protection
  • Efficiency Up to 83% at VIN=4.2V, 3LEDs, ILED=20mA
  • 1.2MHz Fixed Switching Frequency
  • Drives Up to 5LEDs in series
  • 2.5V to 5.5V Input Voltage
  • Low Supply Current: 150μA
  • Matches LED Current
  • Requires Tiny Inductor and Capacitors
  • TSOT23-6 and SOT23-6 Packages
APPLICATIONS
  • Cellular Phones
  • PDAs
  • DSCs
  • Handheld Devices
  • White LED Display Backlighting
DESCRIPTION
AIC3643 is a current-mode pulse-widthmodulation(PWM), step-up DC/DC converter designed to drive white LEDs with a constant current to provide backlight in hand-held devices. Series connection of LEDs provides identical LED currents resulting in uniform brightness. This configuration eliminates the need of ballast
resistors. The built-in open load protection prevents the damage resulting from an open circuit condition. Also low 100mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.
AIC3643 is a step-up PWM converter, which includes an internal N-channel MOSFET switch for high efficiency. The high switching frequency, 1.2MHz, allows the use of tiny external components.
AIC3643 is available in a space-saving TSOT23-6 and SOT23-6 packages.
TYPICAL APPLICATION


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