LT3964 Series

Dual 36V Synchronous 1.6A Buck LED Driver with I2C

Catalog

Dual 36V Synchronous 1.6A Buck LED Driver with I2C

Part	Voltage - Output [Min]	Voltage - Output [Max]	Outputs and Type	Utilized IC / Part	Supplied Contents	Current - Output / Channel [custom]	Voltage - Input [Max]	Voltage - Input [Min]	Features	Grade	Type	Current - Output / Channel	Topology	Number of Outputs	Mounting Type	Package / Case	Voltage - Supply (Min) [Min]	Supplier Device Package	Frequency	Internal Switch(s)	Dimming	Voltage - Supply (Max) [Max]	Applications	Operating Temperature [Min]	Operating Temperature [Max]
Analog Devices EVAL-LT3964-1-AZ	2.5 V	7.7 V	2 Non-Isolated Outputs	LT3964-1	Board(s)	1 A	36 V	9 VDC	Dimmable
Analog Devices LT3964IUHE#PBF										Automotive	DC DC Controller	1.6 A	Step-Down (Buck)	2	Surface Mount	36-WFQFN Exposed Pad	4 V	36-QFN (5x6)	2 MHz		I2C PWM	36 V	General Purpose Industrial Medical	-40 °C	125 ¯C

Catalog

Dual 36V Synchronous 1.6A Buck LED Driver with I2C

Key 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

Description

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.ApplicationsGeneral Purpose, Industrial, Medical and Automotive LightingConstant-Current, Constant-Voltage Source