60V, 3A Synchronous Step-Down LED Driver with Silent Switcher

The LT8376 is a monolithic, synchronous, step-down DC/DC converter that utilizes fixed-frequency, peak current control and provides PWM dimming for a string of LEDs. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. An output voltage limit can be set with a resistor divider to the FB pin.

The switching frequency is programmable from 200kHz to 2MHz by an external resistor at the RT pin or by an external clock at the SYNC/SPRD pin. With the optional spread spectrum frequency modulation enabled, the frequency varies from 100% to 125% to reduce EMI. The LT8376 also includes a driver for an external, high side PMOS for PWM dimming and an internal PWM signal generator for analog control of PWM dimming when an external signal is not available.

Additional features include an LED current monitor, an accurate EN/UVLO pin threshold, open-drain fault reporting for open-circuit and short-circuit load conditions, and thermal shutdown. The LT8376 utilizes the proprietary Silent Switcher technology for very low EMI.

APPLICATIONS

* Automotive Lighting

* Industrial and General Purpose Lighting

* ±1.5% LED Current Regulation

* ±2% Output Voltage Regulation

* 5000:1 PWM Dimming at 100Hz

* 128:1 Internal PWM Dimming

* Spread-Spectrum Frequency Modulation

* Silent Switcher® Architecture for Low EMI

* 3.6V to 60V Input Voltage Range

* 0V to 60V LED String Voltage