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IS31LT3954A - CONSTANT-CURRENT 3-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER

Datasheet Summary

Description

The IS31LT3954A is a DC-to-DC switching converter that integrates an N-channel MOSFET to operate in a buck configuration.

The device can operate from a wide input voltage between 4.5V and 38V and provides a constant current of up to 3A for driving a single LED or multiple series connected LEDs.

Features

  • Wide input voltage supply from 4.5V to 38V - Withstand 40V load dump.
  • True average output current control.
  • 3A maximum output over operating temperature range.
  • Cycle-by-cycle current limit.
  • Integrated high-side MOSFET switch.
  • Dimming via direct logic input or power supply voltage.
  • Internal control loop compensation.
  • Under-voltage lockout (UVLO) and thermal shutdown protection.
  • 2μA low power shutdown.
  • Spread spectrum to optimize EMI.
  • Robust f.

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Datasheet Details

Part number IS31LT3954A
Manufacturer Lumissil
File Size 818.14 KB
Description CONSTANT-CURRENT 3-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER
Datasheet download datasheet IS31LT3954A Datasheet
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Full PDF Text Transcription

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IS31LT3954A CONSTANT-CURRENT 3-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER WITH OUTPUT FAULT REPORTING September 2021 GENERAL DESCRIPTION The IS31LT3954A is a DC-to-DC switching converter that integrates an N-channel MOSFET to operate in a buck configuration. The device can operate from a wide input voltage between 4.5V and 38V and provides a constant current of up to 3A for driving a single LED or multiple series connected LEDs. The external resistor, RISET, is used to set a constant LED output current, while allowing the output voltage to be automatically adjusted for a variety of LED configurations. The IS31LT3954A operates in a fixed frequency mode during switching.
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