LT3956EUHE#PBF

LT3956 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator. It is ideally suited for driving high current LEDs. It features an internal low side N-channel power MOSFET rated for 84V at 3.3A and driven from an internal regulated 7.15V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100KHz to 1MHz to optimize efficiency, performance or external component size. It senses output current at the high side of the LED string. It is used in application such as high power LED, battery charger, accurate current limited voltage regulator etc.

• Wide input voltage range is 4.5V to 80V
• 3000:1 true colour PWM™ dimming
• Output voltage upto 80V, internal 3.3A/84V switch
• Constant-current and constant-voltage regulation
• 250mV high side current sense, open LED protection
• Drives LEDs in boost, buck mode, buck-boost mode
• Programmable undervoltage lockout with hysteresis, constant-voltage loop status pin
• PWM disconnect switch driver, CTRL pin adjusts high side current sense threshold
• Low shutdown current is 1µA max, programmable soft-start
• Operating temperature is -40°C to 125°C, package style is 36-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party