LT3964
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LT3964

Dual 36V Synchronous 1.6A Buck LED Driver with I2C

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Part Details
Part Models 4
1ku List Price
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Features
  • Wide Input Voltage Range: 4V to 36V
  • Two Independent 1.6A/40V Synchronous Bucks
  • I2C Interface for Internal True Color PWM Dimming (8192:1), Analog Dimming and Fault Reporting
  • 1000:1 External True Color PWM Dimming and 10:1 External Analog Dimming
  • PMOS Switch Driver for PWM and Output Disconnect
  • ±3% Constant Current Regulation
  • Adjustable Frequency: 200kHz to 2MHz
  • Frequency Synchronization with Clock Output
  • Programmable OPENLED Protection with Reporting
  • Short-Circuit Protection with Reporting
  • Programmable Undervoltage Lockout with Hysteresis
  • Internal Compensation
  • 9 Unique Device Addresses for I2C
  • Available in 5mm × 6mm 36-Lead QFN Package
Additional Details
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The LT3964 is a dual synchronous step-down DC/DC converter with I2C interface designed to operate as a constant-current and constant-voltage source and is ideal for driving LEDs. The fixed frequency and peak current mode topology result in stable operation over a wide range of supply and output voltages. The ground referred voltage FB pin serves as the input for several LED protection features, and also allows the converter to operate as a constant-voltage source. The maximum output current is set by an external resistor, and the output current amplifier has a rail-to-rail common mode range. LT3964 uses an I2C interface to communicate with a microcontroller to read LED faults, write PWM and analog dimming registers and set fault masking. The I2C PWM input provides LED dimming ratios up to 8192:1. The I2C programmable CTRL register sets the gain of the external CTRL pin, and maximum current sense threshold, providing additional analog dimming capability.

Applications

  • General Purpose, Industrial, Medical and  Automotive Lighting
  • Constant-Current, Constant-Voltage Source
Part Models 4
1ku List Price
price unavailable

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

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Obsolete

LT3964HUHE#TRPBF

Obsolete

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PRODUCTION

LT3964IUHE#TRPBF

Obsolete

Jan 10, 2022

- 21_0152

Obsolescence of LT3964

LT3964HUHE#PBF

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LT3964HUHE#TRPBF

Obsolete

LT3964IUHE#PBF

PRODUCTION

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Filter by Model

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Reset Filters

Part Models

Product Lifecycle

PCN

Apr 11, 2019

- 19_0067

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Notification of Wafer Fab Location Change for 0.35 BCD Process

LT3964HUHE#PBF

Obsolete

LT3964HUHE#TRPBF

Obsolete

LT3964IUHE#PBF

PRODUCTION

LT3964IUHE#TRPBF

Obsolete

Jan 10, 2022

- 21_0152

arrow down

Obsolescence of LT3964

LT3964HUHE#PBF

Obsolete

LT3964HUHE#TRPBF

Obsolete

LT3964IUHE#PBF

PRODUCTION

LT3964IUHE#TRPBF

Obsolete

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2424A

LT3964 Demo Board | VIN = 5V to 36V driving two separate LED strings (1ALED/~3.6VLED) at 2MHz

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DC2424A

LT3964 Demo Board | VIN = 5V to 36V driving two separate LED strings (1ALED/~3.6VLED) at 2MHz

LT3964 Demo Board | VIN = 5V to 36V driving two separate LED strings (1ALED/~3.6VLED) at 2MHz

Product Detail

The DC2424A is a 36V synchronous dual LED driver with I2C featuring the LT3964. It drives two separate LEDs (or channels of LEDs) at 1A when VIN is between 5V and 36V. DC2424A runs at 2MHz switching frequency. Its two channels can drive separate LED strings which can have different currents, voltages, or dimming ratios. It can be controlled with I2C communications or it can be run in non-I2C mode with proper ADDR pin settings. It is protected against both open and short LED conditions and reports the faults. In I2C mode, faults can be enabled or disabled. Up to 9 different DC2424As can be placed on the same I2C bus with unique addresses. A graphical user interface (GUI) is available through QuikEval when connected to a DC2026C Linduino® One demo circuit.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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