圣邦微电子 SGM3138 6通道白光LED驱动器
供稿：圣邦微电子有限公司
发布时间：2010-01-06
产品简介：
产品指标 输入电压范围(V) 2.7 to 5.5 静态电流(μA) 210 关断电流(μA) 0.1 输出电压纹波(mVp-p ) 效率(%) 85 开关频率(kHz) 1000 SHDN高电平(V) 1.2 SHDN低电平(V) 0.6 Vout启动时间(ms) 0.235 封装形式 TQFN3×3-16L
产品介绍：
| 产品描述 |
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The SGM3138 is a high performance white LED driver. It integrates current sources and automatic mode selection charge pump. The part maintains the high efficiency by utilizing a 1×/1.5× fractional charge pump and low dropout current sources. The small equivalent 1× mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of 1× mode and optimize the efficiency of Li-ion battery in white LED applications. The SGM3138 supports up to 6 white LEDs and regulates a constant current which the initial value can be set by an internal resistor. The part implements a 4-bit DAC for brightness control. Users can easily configure the LED current from 1.25mA to 20mA by a serial pulse. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN/SET pin. There are totally 16 steps of current could be set by users. The operating voltage range is 2.7V to 5.5V. Internal soft start circuitry effectively reduces the in-rush current while both start-up and mode transition. The SGM3138 is available in Green TQFN3×3 |
| 产品特性 |
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Ÿ Ÿ Drives up to 6 LEDs at 20mA Each Ÿ One Single Wire Interface Ÿ < 如需了解更多信息,请访问(圣邦微电子有限公司)官网 http://www.sg-micro.com
关键词：6-Channel,Charge,Pump,White,LED,Driver,with,Low,Dropout,Current,Source
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