250 mA Wide VIN Range Buck-Boost Charge Pump With Low Noise Now Offered in High Reliability, MP-Grade Temperature Range

摘要

Linear Technology Corp. has announced a high reliability MP-grade, wider temperature range version of the LTC3245, a versatile 250 mA high voltage buck-boost charge pump. The MP grade has an operating junction temperature range of-55°C to 150°C. The LTC3245 uses switched capacitor fractional conver- sion to maintain regulation over a wide range of input voltage from 2.7 V to 38 V and produces a regulated output of 3.3 V, 5 V or adjustable (2.5 V to 5 V). Internal circuitry automatically selects a conversion ratio of 2:1,1:1 or 1:2 to optimize efficiency as input voltage and load conditions vary. Low operating current (18 uA with no load, 4 uA in shutdown) and low external device count (three small ceramic capacitors and no inductors) make the LTC3245 well suited for low power, space constrained automotive/applications such as ECU/CAN transceiver supplies, industrial housekeeping supplies and efficient low power 12 V to 5 V conversion.