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LM3519 - High Frequency Boost White LED Driver

General Description

The LM3519 drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices.

The LED current is internally set to 20mA.

The series connection allows the LED current to be identical for uniform brightness and minimizes the number of traces to the LEDs.

Key Features

  • 1.
  • 2 Drives 2 to 4 LEDs at 20mA.
  • Up to 30kHz PWM Dimming Control Capability.
  • >80% Peak Efficiency.
  • Up to 8MHz Switching Frequency.
  • Small External Components: 1µH - 3.3µH(typ.2.2μH) Inductor and 1µF Output Capacitor.
  • True Shutdown Isolation.
  • Over-Voltage Protection.
  • Wide Input Voltage Range: 2.7V to 5.5V.
  • Small Footprint SOT-23 Package.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LM3519 www.ti.com SNVS394B – AUGUST 2005 – REVISED MAY 2013 LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness Control Check for Samples: LM3519 FEATURES 1 •2 Drives 2 to 4 LEDs at 20mA • Up to 30kHz PWM Dimming Control Capability • >80% Peak Efficiency • Up to 8MHz Switching Frequency • Small External Components: 1µH - 3.3µH(typ.2.2μH) Inductor and 1µF Output Capacitor • True Shutdown Isolation • Over-Voltage Protection • Wide Input Voltage Range: 2.7V to 5.5V • Small Footprint SOT-23 Package APPLICATIONS • LCD, White LED Backlighting on Mobile Phones • Digital Still Cameras and PDAs • General Purpose LED Lighting in Handheld Devices DESCRIPTION The LM3519 drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices.