• - 交流-直流(AC-DC)控制器和稳压器
• - 直流-直流(DC-DC)控制器、转换器和稳压器
• - 电压和电流管理
• - 通讯IC
• - 驱动器
• - 热管理

• - 时钟及数据分配
• - 标准逻辑

• - 放大器和比较器
• - 模拟开关
• - 数字电位计
• - 接口
• - EMI和RFI滤波器

• - EEPROM存储器
• - 非易失性只读存储器(NVRAM)
• - SRAM存储器

说明

The TPS61043 is a high frequency boost converter with constant current output that drives white LEDs or similar. The LED current is set with the external sense resistor (R_S) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor R_S to 252 mV (typ). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100 Hz to 50 kHz to the control pin (CTRL). To allow higher flexibility, the device can be configured where the brightness can be controlled by an analog signal as well, as described in the application information section. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground.

特性

• Current Source with 18 V Overvoltage Protection
• Powers Up to 4 LEDs in Series
• Input Voltage Range . . 1.8 V to 6.0 V
• Internal 30 V Switch
• Up to 85% Efficiency
• Precise Brightness Control Using PWM Signal or Analog Signal
• Switching Frequency . . Up to 1 MHz
• Internal Power MOSFET Switch . . 400 mA
• Operates With Small Output Capacitors Down to 100 nF
• Disconnects LEDs During Shutdown
• No Load Quiescent Current . . 38 µA Typ
• Shutdown Current . . 0.1 µA Typ
• Available in a Small 3 mm × 3 mm QFN Package
• APPLICATIONS
  • White LED Supply for Display Backlight/Sidelight in
    • PDA, Pocket PC, Smart Phones
    • Handheld Devices
    • Cellular Phones