The LT3964-1 is a dual synchronous step-down DC/ DC converter with an 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 Light Emitting Diode (LED) protection features, and 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. LT3964-1 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. APPLICATIONS * General Purpose, Industrial, Medical and Automotive Lighting * Constant-Current, Constant-Voltage Source * Wide Input Voltage Range: 4V to 36V * Two Independent 2A/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 * P-Channel Metal-Oxide Semiconductor (PMOS) Switch Driver for Pulse-Width Modulators (PWM) and Output Disconnect * ±3% Constant Current Regulation