TPS61042

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS61042 SLVS441D – DECEMBER 2002 – REVISED DECEMBER 2014 TPS61042 Constant Current LED Driver 1 Features 1 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 2 Applications White LED Supply for Backlight/Sidelight Displays – PDA, Pocket PC, Smart Phones – Handheld Devices – Cellular Phones 3 Description The TPS61042 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 (RS) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor RS 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 cu...