Overview

Features and Benefits

  • 128:1 Internal Exponential PWM Dimming
  • Two-Pin Multiplying Analog Dimming
  • Internal Spread Spectrum Frequency Modulation
  • 20,000:1 External PWM Dimming at 100Hz
  • Rail-to-Rail LED Current Sensing: 0V to 120V
  • ±2% LED Current Regulation
  • ±2% Output Voltage Regulation
  • LED Short/Open Protection and Indication
  • Wide Input Voltage Range (5V to 100V)
  • PMOS Switch Driver for PWM and Output Disconnect
  • Constant-Voltage and Constant-Current Regulation
  • Adjustable Switching Frequency Up to 2MHz
  • Programmable VIN UVLO with Hysteresis
  • Side Solderable 20-Lead 3mm × 4mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LT8356-1 is a DC/DC controller designed to drive high current LEDs. 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 makes it possible for the converter to operate as a constant-voltage source. The LT8356-1 can implement boost, boost-to-battery, buck-mode, SEPIC, and flyback LED drivers.

The LT8356-1 senses output current at the high or low side of the load. The product of CTRL and IADJ inputs provides analog programming of the output current. The PWM input and PWMTG high side PMOS driver provides precision time-based LED dimming capability. When driven by an external digital signal, the PWM input provides LED dimming ratios of up to 20,000:1 at 100Hz. When driven by a constant voltage, the PWM input selects from one of 128 internally generated, precision, exponentially spaced dimming ratios ranging from 0.78% up to 100%.

APPLICATIONS

  • High Voltage LED Applications
  • Automotive Head Lamps/Running Lamps
  • Accurate Current Limited Voltage Regulator

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Tools & Simulations

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LTspice

Models for the following parts are available in LTspice:

LT8356-1

Design Resources

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.