The TPS61043 is a high frequency boost converter
tion with constant current output that drives white LEDs or
· Powers Up to 4 LEDs in Series similar. The LED current is set with the external
· Input Voltage Range . . 1.8 V to 6.0 V sense resistor (RS) and is directly regulated by the
· Internal 30 V Switch feedback pin (FB) that regulates the voltage across
the sense resistor RS to 252 mV (typ). To control LED
· Up to 85% Efficiency brightness, the LED current can be pulsed by apply-
· Precise Brightness Control Using PWM Signal ing a PWM (pulse width modulated) signal with a
or Analog Signal frequency range of 100 Hz to 50 kHz to the control
· Switching Frequency . . Up to 1 MHz pin (CTRL). To allow higher flexibility, the device can
· Internal Power MOSFET Switch . . 400 mA be configured where the brightness can be controlled
· Otop1e0ra0tnesF With Small Output Capacitors Down baleypapklaaicngaetaiocnnuarlroiengnfotssrmigthanrtaoiolungahsstehwceetiloLl,nE.aDsTsoddeuasrivcnorgiibdsehdpuotidnsosiwtbhnlee,
· Disconnects LEDs During Shutdown the control pin (CTRL) disables the device and
· No Load Quiescent Current . . 38 μA Typ disconnects the LEDs from ground. For maximum
· Shutdown Current . . 0.1 μA Typ safety during operation, the output has integrated
· Available in a Small 3 mm ′ 3 mm QFN overvoltage protection that prevents damage to the device by limiting the output voltage to typically 18 V
Package in case of a high impedance output (e.g. faulty LED).
The TPS61042 device provides a solution for applications
where higher LED currents or more than four
· White LED Supply for Display LEDs in series need to be powered.