Led Driver, 1 Output, Boost, Buck, Flyback, SEPIC, 4.5V-60V in, 1MHz switch, QFN-36

LT3955EUHE#PBF - Led Driver, 1 Output, Boost, Buck, Flyback, SEPIC, 4.5V-60V in, 1MHz switch, QFN-36

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Product Information

Boost, Buck, Buck-Boost, Flyback, SEPIC
MSL 1 - Unlimited
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Product Overview

The LT3955EUHE#PBF is a DC/DC Converter designed to operate as a constant-current source and constant-voltage regulator. It features an internal low-side N-channel MOSFET rated for 80V/3.5A. The LT3955 is ideally suited for driving high current LEDs, but also has features to make it suitable for charging batteries and super-capacitors. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback pin serves as the input for several LED protection features and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size. The PWM input can be configured to self-oscillate at fixed frequency with duty ratio programmable from 4 to 96%. When driven by an external signal, the PWM input provides LED dimming ratios of up to 3000:1.
  • Programmable PWM dimming signal generator
  • Constant current (±3%) and constant-voltage (±2%) regulation
  • Accurate analogue dimming
  • Output short-circuit protected boost
  • Open LED protection and reporting
  • Programmable VIN UVLO with hysteresis
  • C/10 Indication for battery chargers
  • 0 to 80V Rail-to-rail current sense range


LED Lighting, Consumer Electronics

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