TPS61042 概述

The TPS61042 is a high frequency boost converter with constant current output that drives white LEDs or similar.

To allow higher flexibility, the TPS61042 can be configured where the brightness can be controlled by an analog signal as well. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the TPS61042 and disconnects the LEDs from ground.

TPS61042 特性

• Current Source With Overvoltage Protection
• Input Voltage Range . . 1.8 V to 6 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 . . 500 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

TPS61042 应用

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