30-V, 500-mA Switch Boost Converter in QFN-8 for White LED Applications

30-V, 500-mA Switch Boost Converter in QFN-8 for White LED Applications - TPS61042

Recommended alternative parts

  • TPS61046  -  For applications requiring smaller package or True Disconnection


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 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).


  • 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

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Parametrics Compare all products in Backlight LED Driver

Channels (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switching Frequency (Max) (kHz)
LED Current Per Channel (mA)
LED (#)
Shutdown Current (Typ) (uA)
Peak Efficiency (%)
LED Configuration
Operating Temperature Range (C)
TPS61042 TPS61043
1    1   
1.8    1.8   
6    6   
1.8    1.8   
28    16.9   
1000    1000   
Inductive    Inductive   
50    50   
6    4   
Boost    Boost   
0.1    0.1   
85    85   
Series    Series   
Load Disconnect During Shutdown    Load Disconnect During Shutdown   
Catalog    Catalog   
-40 to 85    -40 to 85   
8SON    8SON