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

　　MILPITAS, CA – August 20, 2013 – Linear Technology Corporation introduces new high reliability MP grade, extended temperature range versions of the LTC3245, a general purpose 250mA high voltage buck-boost charge pump. The MP grade features an operating junction temperature range of -55°C to +150°C. The LTC3245 uses switched capacitor fractional conversion to maintain regulation over a wide input voltage range of 2.7V to 38V and produces a regulated output of 3.3V, 5V or adjustable (2.5V to 5V). Internal circuitry automatically selects a 2:1, 1:1 or 1:2 conversion ratio to optimize efficiency over varying input voltage and load conditions. Low operating current (18μA at no load, 4μA in shutdown) and low external parts count (3 small ceramic capacitors, no inductor) make the LTC3245 ideal for low power and space constrained automotive applications such as ECU/CAN transceiver power, industrial housekeeping supplies, and efficient low power 12V to 5V conversion.

　　The LTC3245's unique constant frequency architecture features lower switching edge change rates, resulting in lower conducted and radiated noise than traditional switching regulators. The device offers pin-selectable Burst Mode® operation, allowing the user to trade slightly higher output ripple for higher efficiency and lower quiescent current. Other features include few external components and stability with ceramic capacitors, soft-start circuitry to prevent excessive current at startup, and short-circuit and overtemperature protection.

　　The LTC3245 MP-grade device is available in a compact 12-lead MSOP package with a backside thermal pad. Pricing starts at $7.55 each in 1,000-piece quantities and is available from stock. For more information, visit www.linear.com.cn/product/LTC3245.

　　Photo caption: Low noise high voltage buck-boost charge pump MP grade version

　　Performance Summary: LTC3245 - MP Grade

　　VIN range is 2.7V to 38V

　　Operating junction temperature range: -55°C to +150°C (MP grade only)

　　IQ = 18μA when operating; 4μA when shut down

　　12V to 5V conversion efficiency = 81%

　　Multi-mode operation with automatic mode switching (2:1, 1:1, 1:2)

　　Low noise, constant frequency operation

　　IOUT = 250mA (max)

　　Pin-selectable Burst Mode operation

　　VOUT: Fixed 3.3V, 5V or adjustable

　　Overheat and short circuit protection

　　Thermally enhanced 12-pin MSOP package

　　About Linear Technology Corporation

　　Linear Technology Corporation, a member of the S&P 500 Index, has been designing, manufacturing and selling a wide range of high-performance analog integrated circuits for major global companies for more than 30 years. Linear Technology's products provide an indispensable bridge between the analog world and digital electronics, with applications in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology manufactures power management, data conversion, signal conditioning, RF and interface ICs, µModuleÒ subsystems, and wireless sensor network products. For more information, please visit www.linear.com.cn.