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LM2794BLX Constant Current LED Driver PWM，Switched Capacitor backlight 325KHz ~ 675KHz 2.7V ~ 5.5V 3.8V BLP14EHB 42AM Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
| 恒流 Constant Current | 是 YES |
| 恒压 Constant Voltage | |
| 拓扑 Topology | PWM，切换式电容器（充电泵） PWM, Switched Capacitor (Charge Pump) |
| 输出数 Number of Outputs | 4 |
| 内部驱动器 Internal Driver | 是 YES |
| 初级类型 Type - Primary | 背光 Backlight |
| 次级类型 Type - Secondary | 白色 LED White LED |
| 频率 Frequency | 325KHz ~ 675KHz |
| 电源电压 Voltage - Supply | 2.7V ~ 5.5V |
| 输出电压 Voltage - Output | 3.8V |
| Description & Applications | FEATURES • Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control • Regulated current sources with ±0.5% matching between any two outputs • High efficiency 3/2 boost function • Drives one, two, three or four white LEDs • 2.7V to 5.5V Input Voltage • Up to 80mA output current • Analog brightness control • Active-low or high shutdown input (’94/95) • Very small solution size and no inductor • 2.3µA (typ.) shutdown current • 325kHz switching frequency (min.) • Constant Frequency generates predictable noise spectrum • Standard Micro SMD-14 package: 2.08mmX2.403mmX0.845mm High • Thin Micro SMD-14 package: 2.08mmX2.403mm X0.600mm High Applications • White LED Display Backlights • White LED Keypad Backlights • 1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones |
| 描述与应用 | 特点 •电流调节开关电容LED电源与模拟和PWM亮度控制 •稳压电流源匹配±0.5％任何两个输出之间 •高效率升压功能3/2 •驱动一个，两个，三个或四个白光LED •2.7V至5.5V的输入电压 •高达80mA的输出电流 •模拟亮度控制 •主动高或低关断输入（94/95） •非常小的解决方案尺寸和无电感器 •2.3μA（典型值）的关断电流 •325kHz开关频率（分钟） •恒频产生可预见的噪声频谱 •标准微SMD-14封装：2.08mmX2.403mmX0.845mm高 •薄微型SMD-14封装：2.08mmX2.403mm X0.600mm高 应用 •白光LED显示器背光 •白光LED键盘背光 •1节锂离子电池供电设备，包括掌上电脑，手持电脑，蜂窝电话 |
