AIC1648中文资料Built-in OVP White LED Step-Up Converter数据手册AIC规格书

描述 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.

特性 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

应用 Application

• Cellular Phones
• PDAs
• DSCs
• Handheld Devices
• White LED Display Backlighting