A 500mA (IOUT), 36V step-down switching regulator has been released by Linear Technology. The device features an integrated LDO packaged in a 3mm x 3mm QFN or MSOP-12E.
The LT3645 operates from a VIN range of 3.6V to 36V with transient protection to 55V, making it ideal for load dump and cold-crank conditions found in automotive applications. Its internal 0.75A internal switch can deliver up to 500mA of continuous output current to voltages as low as 0.8V. The device uses a constant switching frequency of 750kHz to minimise noise while optimising efficiency. In addition to the primary switcher channel, the integrated LDO can be used for an additional low noise output of up to 200mA of continuous current at voltages as low as 0.8V. The device offers a compact, thermally efficient dual output solution.
