LT3754

• Product introduction

LT3754

16-channel x 50mA LED driver

peculiarity

• LEDs up to 45V x 50mA, 16-channel LEDsdrive
• Wide input range: 6V to 40V
• ±2.8% LED Current Matching Accuracy at 20mA (±0.7% typical)
• Up to 3000 : 1 True Color PWM^TMDimming range
• LED current can be programmed with a single resistor (10mA to 50mA)
• Even in PV_IN> V_OUTstill maintains a regulated effect on the LED current
• The output is suitable for LED V_Ffor optimal efficiency
• Provides fault marking and protection against open LED strings
• For V_OUTShort-circuited LED pin protection
• Higher LED currents can be provided by parallel channels
• Programmable LED current derating vs. temperature
• Accurate undervoltage lockout threshold with programmable hysteresis
• Programmable Frequency (100kHz to 1MHz)
• Can be synchronized to an external clock

description

LT^®The 3754 is a 16-channel LED driver with a step-up DC/DC controller capable of driving LEDs up to 45V. Each channel contains an accurate current sink with ±2.8% LED current matching accuracy. Each channel follows a master programmable current to deliver 10mA to 50mA of LED current per string of LEDs. Higher LED currents can be provided by paralleling channels. The output voltage is suitable for LED V_Ffor optimal efficiency, and an open-LED fault will not affect the operation of the connected LED strings.

The LT3754 offers a PWM dimming range of up to 3000:1 and an analog dimming range of up to 25:1. The operating frequency can be set with a single resistor (from 100kHz up to 1MHz) or synchronized to an external clock.

Other features of the device include programmable maximum V_OUT(for open-LED protection), a fault flag (responsible for indicating open-LED), programmable LED current derating vs. temperature, micropower shutdown mode, and internal soft-start function. The LT3754 is available in a thermally enhanced 5mm x 5mm 32-pin QFN package.

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• Back lighting for cars, laptops, and TV monitors