Buck boost charge pump works over MP-grade temperature range

The MP-grade device has an operating junction temperature range of -55 to 150°C. It uses switched capacitor fractional conversion to maintain regulation over a wide range of input voltage from 2.7 to 38V and produces a regulated output of 3.3V, 5V or adjustable. Internal circuitry automatically selects a conversion ratio of 2:1, 1:1 or 1:2 to optimise efficiency as input voltage and load conditions vary. Low operating current (18µA with no load, 4µA in shutdown) and low external device count (three small ceramic capacitors and no inductors) make the LTC3245 suited to low power, space constrained automotive applications such as ECU/CAN transceiver supplies, industrial housekeeping supplies and efficient low power 12 to 5V conversion. The device has pin selectable Burst Mode operation, enabling the user to trade off low output ripple for better efficiency and lower quiescent current. Other features include low external parts count with ceramic capacitor stability, soft start circuitry to prevent excessive current flow during start up, as well as short circuit and thermal protection.