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

The AAT1401, AAT1402, AAT1403 and AAT1410 are step-up single channel LED driver with an input voltage range of 2.7V to 5.5V. Parts of the AAT14xx family can drive up to 10 LEDs in a single string. 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 that can be set from 10 to 31mA by a single external resistor. The high switching frequency supports ultra small, low-cost filter components. Two dimming controls are available; 32 dimming steps using the S2Cwire™ interface, and filtered or direct PWM control (dependent on part number). The frequency range of the PWM dimming extends up to 100 kHz and eliminates audible noise and is suitable for CABC (Content Adaptive Brightness Control) applications.