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( File format: PDF, 717 KB )
Constant Current LED Driver (Rev. C)
Texas Instruments

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. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground. For maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the device in case of a high impedance output (e.g. faulty LED).
Features
Current Source With Overvoltage ProtectionInput Voltage Range . . 1.8 V to 6 VInternal 30 V Switch Up to 85% EfficiencyPrecise Brightness Control Using PWM Signal or Analog SignalSwitching Frequency . . Up to 1 MHzInternal Power MOSFET Switch . . 500 mAOperates With Small Output Capacitors Down to 100 nFDisconnects LEDs During ShutdownNo Load Quiescent Current . . 38 ?A TypShutdown Current . . 0.1 ?A TypAvailable in a Small 3 mm 3 mm QFN PackageAPPLICATIONSWhite LED Supply for Backlight/Sidelight Displays PDA, Pocket PC, Smart PhonesHandheld DevicesCellular Phones

Related Datasheets
Part Number Description Category
? ?TPS61040 Low Power DC/DC Boost Converter in SOT-23 Package (Rev. D) ICs, Interface
? ?TPS61041 Low Power DC/DC Boost Converter in SOT-23 Package (Rev. D) ICs, Interface
? ?TPS61043 TPS61043: Constant Current LED Driver (Rev. A) ICs, Interface
? ?TPS61045 TPS61045, Digitally Adjustable LCD Boost Converter (Rev. A) ICs, Interface
? ?TPS61160 White LED Driver With Digital and PWM Brightness Control in 2mm x 2mm QFN Pkg ICs, Interface
? ?TPS61161 White LED Driver With Digital and PWM Brightness Control in 2mm x 2mm QFN Pkg ICs, Interface
? ?TPS61165 High Brightness White LED Driver in 2mm x 2mm QFN Package ICs, Interface



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