With its wide input voltage range of 4V to 36V (transients up to 40V), the LT3475 regulates a broad array of power sources, from 2-cell Li-Ion batteries and 5V logic rails to unregulated wall transformers and automotive power systems. Its switching frequency can be set with a single resistor from 200kHz to 2MHz, enabling the use of tiny inductors and ceramic capacitors. Delivered in a thermally enhanced TSSOP-20 package, it offers a very compact solution for driving high current LEDs.
The LT3475 utilizes a high side sense, enabling a grounded LED cathode connection, eliminating the requirement for an LED return wire in most applications. It also has an integrated boost diode for each channel, further reducing the solution footprint and cost. Additional features include both open LED and short circuit protection.
Available from stock in a thermally enhanced 20-lead TSSOP package, the LT3475EFE is priced starting at $3.50 each in 1,000-piece quantities. An I Grade version, the LT3475IFE is also available from stock, with 1,000-piece pricing starting at $4.20 each.