圣邦微电子　SGM3134 四通道低压差恒流型白光LED驱动_White_LED

圣邦微电子　SGM3134 四通道低压差恒流型白光LED驱动

2010/1/6 10:44:47

产品简介：

产品指标输入电压范围(V) 2.5 to 5.5 静态电流(μA) 190 关断电流(μA) 1 输出电压纹波(mVp-p ) 效率(%) 开关频率(kHz) SHDN高电平(V) 2.5 SHDN低电平(V) 0.7 Vout启动时间(ms) 封装形式 SOT-23-6L

产品分类：

嵌入式系统

品牌：

产品介绍

产品描述

The SGM3134 low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. It is optimized for low power keypad and portable backlighting applications.

The SGM3134 uses an internal resistor to set the bias current for four LEDs, which are matched to ±5%. The SGM3134's advantages over ballast resistors include much lower bias variation with supply voltage variation, significantly lower dropout voltage, and in some applications, significantly improved efficiency.

The SGM3134 requires only a 40mV dropout voltage at a 20mA load on each output to match the LED brightness.

The SGM3134 is available in Green SOT-23-6L package. It operates over an ambient temperature range of -40℃ to +85℃.

产品特性

Ÿ Support up to 4 LEDs

Ÿ Low 40mV Dropout at 20mA

Ÿ Less than ±5% LED Current Matching