AIC1648
Built-in OVP White LED Step-Up Converter
- 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: 70uA
- 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
- 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.
AIC1648 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.
AIC1648 is available in a space-saving TSOT23-6, and SOT23-6 packages.
- TYPICAL APPLICATION
