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The LT3762EUFD is a synchronous DC/DC controller, suitable for use as a constant current source and constant voltage regulator. It adopts a programmable internal PWM dimming signal generator and a synchronous gate driver. The following are its core features and parameters:

3000:1 external PWM dimming

250:1 internal PWM dimming

Wide VIN operating range: 2.5V to 38.5V

Synchronous boost output voltage up to 60V

Spread spectrum modulation suitable for lower EMI

PMOS switch driver suitable for PWM and output disconnection functions

Constant current (±3.5%) regulation

Constant pressure (±2%) regulation

Rail-to-rail LED current sensing: 0V to 60V

Programmable VIN undervoltage lock

Simulated dimming is carried out through two control pins

Operating frequency: 100 KHZ to 1MHz

Implement programmable LED open-circuit protection using OPENLED markers

Short-circuit protection and SHORTLED marking

Drive the LED in boost, SEPIC, buck mode or boost/buck mode configuration

28-pin QFN (4mm × 5mm) bare pad package

The LT3762EUFD is suitable for driving high-current leds with high efficiency and low power loss. Rail-to-rail switch current sensing supports both synchronous boost topology and asynchronous topology (such as SEPIC). The voltage feedback pin serves as the input for multiple LED protection functions while allowing the converter to operate as a constant voltage source.

In addition The LT3762EUFD also includes an integrated DC/DC converter to efficiently generate a regulated 7.5V power supply for the N-channel MOSFET gate driver. The PWM pin controls the PWMTG to drive the P-channel MOSFET, thereby achieving a high PWM dimming range (3000:1) and providing LED overcurrent protection and short-circuit protection boost capabilities.

Typical applications

Industrial and automotive lighting

Precise current-limiting voltage regulator

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