Controller operates across a -55 to +150°C temperature range

18th March 2015

Siobhan O'Gorman

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Datasheet

The LTC4412, a PowerPath controller developed by Linear Technology, is now available in high reliability and military temperature grade versions. The device permits low-loss ORing of multiple input DC power sources. Its 20mV forward voltage is at least 10 times lower than that of a Schottky diode. As a result, the device increases efficiency by an order of magnitude, due to much lower power loss and less self-heating in systems requiring automatic switching or load sharing between power sources.

The controller is guaranteed to meet performance specifications over a wide range of user conditions including an operating junction temperature range up to -55 to +150°C across an operating voltage range of 2.5-28V.

The LTC4412 also provides reverse battery and MOSFET protection circuitry in a compact SOT package. The device offers a digital control input and an open-drain status output pin to simplify interfacing to a MCU. Applications include systems that typically take power from multiple input sources, including high current PowerPath switches, UPSs, backup battery systems, logic-controlled power switches and automotive and industrial systems.

Multiple LTC4412 devices can be used to enable switchover between multiple batteries or charging of multiple batteries from a single charger. The controller’s status pin (STAT) can be used to control a second P-channel MOSFET power switch so that both Schottky diodes are eliminated from the diode-OR circuit. The device’s low 11µA quiescent current is independent of the load current.

The LTC4412 is offered in a low-profile SOT-23 package. E and I grades feature an operating junction temperature range of -40 to +85°C, while high reliability H grades operate from -40 to +150°C, and military MP grades feature a temperature range of -55 to +150°C. The H grade and MP grade devices are available now, priced at $1.85 and $3.65 respectively, and sold in 1,000-piece quantities.