Analog Devices Inc. LT3964-1 Synchronous 2A Buck LED Driver

Analog Devices Inc. LT3964-1 Synchronous 2A Buck LED Driver is a dual synchronous step-down DC-DC converter with an I²C interface. The interface is 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 Light light-emitting diode (LED) protection features and allows the converter to operate as a constant-voltage source. An external resistor sets the maximum output current, and the output current amplifier has a rail-to-rail common mode range. The Analog Devices Inc. LT3964-1 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.