S2C Controlled, Serial LED Boost Driver

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Manufacturer Skyworks


Description :

The AHK1421 is a highly integrated, high efficiency LED backlight solution for portable appliances including mobile phones, smartphones, PDAs, PNDs etc. The device operates from a single-cell Li-ion or polymer battery in the voltage range from 2.7V to 5.5V. An integrated boost (step-up) converter provides up to 28V output for driving up to 6 series LEDs. In conjunction with an external current setting ballast resistor, the AHK1421 uses a single wire, S2C digital interface to adjust the output current and therefore brightness, in 32 linear steps. The boost switching frequency operates at 1MHz to allow optimum efficiency and the smallest external L/C filtering components. Integrated protection features protects against, open circuit LEDs, short circuits and over temperature conditions. The AHK1421 is available in a Pb-free TSOT23-6 package.

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    • Input Voltage Range: 2.7 to 5.5V
    • Drives up to 6 Series LEDs at 31mA
    • Integrated Boost Converter
    • 1MHz Switching Frequency
    • Up to 86% Efficiency
    • Internal Compensation
    • 32 Steps S2Cwire Single Wire Interface
    • Shutdown Current < 4μA
    • Integrated Protection Features
    • Over-Voltage Protection for Open-LED Faults
    • Over Temperature Protection
    • TSOT23-6 package

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Features Similar products
Control scheme Simple Serial Control  

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Switching frequency (kHz) 1000  
Max Input Voltage (V) 2.7 to 5.5  
Typ. Active Current (µA) 170  
Output Capacitor Type 2.2 μF / 50 V, Ceramic Capacitor  
Output Current (mA) 20  
Operating Temperature (°C) -40 to +85  
Package TSOT23-6