TPS61043 概述

The TPS61043 is a high frequency boost converter with constant current output that drives white LEDs or similar.

To allow higher flexibility, the TPS61043 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 TPS61043 and disconnects the LEDs from ground.

TPS61043 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

TPS61043 应用

• White LED Supply for Display Backlight/Sidelight in
  • PDA, Pocket PC, Smart Phones
  • Handheld Devices
  • Cellular Phones