AHK1421 S2C Controlled, Serial LED Boost Driver

The AHK1421 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 AHK1421 is available in a 10-pin wafer-level chip scale package (WLCSP) and is rated over the -40°C to +85°C temperature range.

技术特性

Input Voltage Range: 2.7 to 5.5V
Drives up to 37V with 8 Series LEDs at 31mA
1MHz Switching Frequency Allows Small External Components
Up to 83% Efficiency with 10μH Inductor
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

订购信息 Ordering Information

AHK1421

应用领域 APPLICATION

White LED backlight
Feature phones
Smartphones
PDAs
PMP
PNDs
Portable DVD Players

AHK1421 典型应用

应用技术支持与电子电路设计开发资源下载	版本信息	大小
AHK1421 数据资料DataSheet下载:pdf	Rev.V2	2 页