Aaustriamicrosystems AS3676 LED照明管理方案

Aaustriamicrosystems公司的 AS3676 是高度集成的CMOS功率和照明管理单元,适嗯移动手机或其它以一节锂离子电池或3节NiMH 电池供电的设备.它集成了一个用于白背景光LED的升压DC/DC转换器,一个大功率电荷泵,一个ADC,13个电流沉,LED功能测试,一个两线串行接口和控制逻辑.本文介绍了AS3676主要特性, 应用方框图, 模拟LDO方框图, 升压DC/DC转换器方框图, 环境光传感器内部电路图以及LED功能测试电路图, 自动控制LED内部电路图和外接元件列表.
 
AS3676 Flexible Lighting Management (CP, DCDC, 13 Current Sinks,ADC, LED Test, LDO, DLS and Ambient Light sensing)
The AS3676 is a highly-integrated CMOS Power and Lighting Management Unit for mobile telephones, and other 1-cell Li+ or 3-cell NiMH powered devices.
The AS3676 incorporates one Step Up DC/DC Converter for white backlight LEDs, one high-power Charge Pump, one Analog-to-Digital Converter, 13 current sinks, LED in-circuit function test, a two wire serial interface, and control logic all onto a single device. It supports ambient light sensor processing and a Dynamic Luminance Scaling (DLS) input. Output voltages and output currents are fully programmable.
The AS3676 is part of the austriamicrosystems AS3675, AS3687/87XM and AS3689 lighting management unit family. It is software compatible to AS3687/87XM and AS3689 and pin and software compatible to AS3675.
AS3676主要特性:
High-Efficiency Step Up DC/DC Converter
- Up to 26V/50mA for White LEDs
- Programmable Output Voltage with External Resistors and Serial Interface
- Over voltage Protection
High-Efficiency High-Power Charge Pump
- 1:1, 1:1.5, and 1:2 Mode
- Automatic Up Switching (can be disabled and 1:2 mode can be blocked)
- Output Current up to 400mA/500mA pulsed
- Efficiency up to 95%
- Very Low effective Resistance (2.5Ω typ. in 1:1.5)
- Only 4 External Capacitors Required:
2 x 1μF Flying Capacitors, 2 x 2.2μF Input/Output Capacitors
- Supports LCD White Backlight LEDs, or RGB LEDs
13 Current Sinks
- All 13 current sinks fully Pro...