LED driver controller with 100V output ceiling
The LT3756IUD#PBF: Its 100V output rating means it can power a long series string of LEDs — think a dozen or more white LEDs in series — from a single boost or flyback stage, without needing a separate current-balancing circuit for each LED. The controller supports four topologies — boost, buck, SEPIC, and flyback — so the same IC can be dropped into a constant-current LED driver whether the input rail is above or below the LED string voltage. The 100kHz to 1MHz switching frequency range lets you trade off inductor size against switching losses: lower frequency for efficiency, higher for a compact footprint.
Analog and PWM dimming — two ways to set brightness
The LT3756IUD#PBF supports both analog and PWM dimming. Analog dimming adjusts the LED current continuously by varying a control voltage — useful for smooth, flicker-free brightness changes. PWM dimming switches the LED string on and off at a frequency above visible flicker, which preserves colour temperature across the dimming range, making it the preferred method for architectural or display backlighting. The controller itself does not include an internal switch — it drives an external MOSFET. This lets you scale the output power by choosing a FET with the right Rds(on) and current rating for your LED load, rather than being limited by an integrated switch.
Wide supply range and industrial temperature grade
Supply voltage spans 6V to 100V, so the controller can run from a 12V or 24V industrial rail, an automotive battery (with transients), or a 48V telecom bus. Housed in a 16-lead WFQFN with exposed pad (3x3 mm), the package keeps the board footprint small.