Serial LED Driver with Filtered PWM and 32 Step S²C Dimming Control

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Manufacturer Skyworks


Description :

The AAT1401 is a step-up single channel LED driver with an input voltage range of 2.7V to 5.5V. The wide input voltage range, small solution size, advanced dimming features and high efficiency is suitable for LED backlight solutions for single cell Li-ion based equipment. A precision, high voltage current sink maintains the maximum LED current set by an external resistor from 10 to 31mA. The high switching frequency supports ultra small, low cost filtering components. Two dimming controls are available; 32 dimming steps using the S²Cwire™ interface, and filtered PWM control. The frequency range of the PWM dimming extends up to 100 kHz eliminating audible noise and suitable for CABC (Content Adaptive Brightness Control) applications. The device includes over-temperature protection and programmable over-voltage protection and recovers automatically when the faults are removed. The AAT1401 is available in a 10-pin wafer-level chip scale package (WLCSP) and is rated over the -40°C to +85°C temperature range.

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    • Input Voltage Range: 2.7 to 5.5V
    • Drives up to 28V with 6 Series LEDs at 31mA
    • 1MHz Switching Frequency Allows Small External Components
    • Up to 85% Efficiency
    • Dimming Control Options:
    • 32 Steps S2Cwire Single Wire Interface
    • Filtered PWM
    • Low Operating Current at 2.3mA
    • Shutdown Current < 1μA
    • Over-Voltage Protection for Open-LED Faults
    • Over Temperature Protection
    • Ultra Small, Low Profile 10-pin 1.55 x 1.15mm WLCSP Package

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Control scheme Current Mode Control  

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Switching frequency (kHz) 1000  
Max Input Voltage (V) 2.7 to 5.5  
Output Voltage (V) 28  
Typ. Active Current (µA) 430  
Output Capacitor Type 0.1 μF / 50 V, MLC Capacitor  
Output Current (mA) 31  
Operating Temperature (°C) -40 to +85  
Package WLCSP-10