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TPS61042

Features: Current Source With Overvoltage ProtectionInput Voltage Range . . 1.8 V to 6.0 VInternal 30 V SwitchUp to 85% EfficiencyPrecise Brightness Control Using PWM Signal or Analog SignalSwitching Frequency . . Up to 1 MHzInternal Power MOSFET Switch . . 500 mAOperates With Small Output Capacit...

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SeekIC No. : 004527054 Detail

TPS61042: Features: Current Source With Overvoltage ProtectionInput Voltage Range . . 1.8 V to 6.0 VInternal 30 V SwitchUp to 85% EfficiencyPrecise Brightness Control Using PWM Signal or Analog SignalSwitchin...

TPS61042 Data Sheet

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Part Number:
TPS61042
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

Current Source With Overvoltage Protection
Input Voltage Range . . 1.8 V to 6.0 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


Application

White LED Supply for Backlight/Sidelight Displays
   -- PDA, Pocket PC, Smart Phones
   -- Handheld Devices
   -- Cellular Phones


Specifications

  TPS61042
Supply Voltages, v(VIN) (2) -0.3 V to 7 V
Voltages, V(Rs) , V(CTRL), V(FB) -0.3 V to VIN + 0.3 V
Voltages, V(SW), V(LED) (2) 30 V
Voltage, V(OVP) 30 V
Continuous power dissipation See Dissipation Rating Table
Operating junction temperature range -40°C to 150°C
Storage temperature range, TSTG -65°C to 150°C
Lead temperature (soldering, 10 sec) 260°C



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 of TPS61042 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 TPS61042 and disconnects the LEDs from ground. For maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the TPS61042 in case of a high impedance output (e.g. faulty LED).




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