DESCRIPTION

AIC1648 is a fixed frequency step-up DC/DC converter designed to drive white LEDs with a constant current to provide backlight in handheld 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. Low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.

FEATURES

• Built-In Open Circuit Protection

• Over Voltage Protection

• Efficiency Up to 84 at VIN=4.2V, 3LEDs, ILED=20mA

• 1.2MHz Fixed Switching Frequency

• Drives Up to 5LEDs in series

• Low Supply Current: 70µA

• Matches LED Current

• Requires Tiny Inductor and Capacitors

• Tiny SOT-23-6 Package

APPLICATIONS

• Cellular Phones

• PDAs

• DSCs

• Handheld Devices

• White LED Display Backlighting