AIC3643 Datasheet PDF | Analog Integrations

Analog Integrations AIC3643

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. This configuration eliminates the need of ballast resistors. The built-in open load protection prevents the damage resulting from an open circuit condition.

Part No.	AIC3643
Datasheet	AIC3643 Download
Manufacturer	Analog Integrations
Description	Built-in OVP White LED Step-Up Converter
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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 TSOT-23-6, and SOT-23-6 Packages

DESCRIPTION

Series connection of LEDs provides identical LED currents resulting in uniform brightness. 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 SOT-23-6 packages.

APPLICATIONS

Cellular Phones PDAs DSCs Handheld Devices White LED Display Backlighting TYPICAL APPLICATION CIRCUIT 3.0~4.2V C1 1μF L 6.8μH VIN SW D1 C2 3.3μF Efficiency (%) 90 85 VIN=4.2V VIN=3.6V 80 SHDN...