LT3964 - Dual 36V Synchronous 1.6A Buck LED Driver with I2C
Datasheet Documentation


Typical Application

LT3964 Typical Application
LT3964 Typical Application


The LT®3964 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.


5x6 QFN-36

LT3964 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
LT3964EUHE#TRPBF QFN 36 E $6.49 $4.56
LT3964HUHE#PBF QFN 36 H $7.43 $5.20
LT3964IUHE#TRPBF QFN 36 I $7.13 $5.01
LT3964IUHE#PBF QFN 36 I $7.07 $4.95
LT3964HUHE#TRPBF QFN 36 H $7.49 $5.26
LT3964EUHE#PBF QFN 36 E $6.43 $4.50
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2424A LT3964 Demo Board | VIN = 5V to 36V driving two separate LED strings (1ALED/~3.6VLED) at 2MHz Contact Factory