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TPS61042-TPS61042DRBR-TPS61042DRBR G4-TPS61042DRBRG4-TPS61042DRBT
30-V, 500-mA Switch Boost Converter in QFN-8 for White LED Applications
VIN
CTRL
OVP
GND
4.7 μHΩ
Vin
1.8 V to 6 V
LED†
100 nF
Cin
4.7μFProduct
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TPS61042SLVS441D –DECEMBER 2002–REVISED DECEMBER 2014
TPS61042 Constant Current LED Driver Features 3 DescriptionThe TPS61042isa high frequency boost converter Current Source With Overvoltage Protection with constant current output that drives white LEDsor• Input Voltage Range: 1.8Vto6V similar. The LED currentis set with the external• Internal30V Switch sense resistor (RS) andis directly regulated by the
feedback pin (FB) that regulates the voltage across• Upto 85% Efficiency the sense resistor RSto 252 mV (typ). To control LED• Precise Brightness Control Using PWM Signalor brightness, the LED current can be pulsed byAnalog Signal applyinga PWM (pulse width modulated) signal with• Switching Frequency: Upto1 MHz a frequency rangeof 100 Hzto 50 kHzto the control
pin (CTRL). To allow higher flexibility, the device can• Internal Power MOSFET Switch: 500 mA configured where the brightness canbe controlled• Operates With Small Output Capacitors Downto by an analog signal as well, as describedin the100 nF application information section. To avoid possible• Disconnects LEDs During Shutdown leakage currents through the 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• Availableina Small3 mm×3 mm QFN Package overvoltage protection that prevents damageto the
devicein caseofa high impedance output (e.g. faulty
2 Applications LED). White LED Supply for Backlight/Sidelight Displays
Device Information(1) PDA, Pocket PC, Smart Phones– Handheld Devices Cellular Phones (1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Applicationof1µF and larger, reducethe LED current
