Hi-rel, low power charge pump targets automotive, industrial applications

August 26, 2013 // By Christoph Hammerschmidt
Linear Technology has a high reliability MP-grade, wider temperature range version of its LTC3245, a 250mA high voltage buck-boost charge pump. The MP grade has an operating junction temperature range of -55°C to +150°C.

Low operating current and low external device count (three capacitors, no inductors) suit the LTC3245 for low power, space constrained automotive applications such as ECU/CAN transceiver supplies, industrial housekeeping supplies and efficient low power 12V to 5V conversion.The LTC3245 uses switched capacitor fractional conversion to maintain regulation over a wide range of input voltage from 2.7V to 38V and produces a regulated output of 3.3V, 5V or adjustable (2.5V to 5V). 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.

The LTC3245's constant frequency architecture with reduced switching edge rates provides lower conducted and radiated noise compared to conventional switching regu­lators. The device has pin selectable Burst Mode operation, enabling you 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 startup, plus short circuit and thermal protection.

The LTC3245 MP grade is available in a 12-lead MSOP package with a backside thermal pad.

Linear Technology;  www.linear.com/product/LTC3245