LTC4357HMS8#PBF

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PMIC - OR Controllers, Ideal Diodes

The LTC4357HMS8#PBF is a dual-channel OR controller and ideal diode device from Linear Technology. It is used to drive, control and protect a variety of applications from portable electronics to industrial equipment. Its main features include high-efficiency bidirectional ORing, reverse current blocking, true galvanic isolation between logic and power, and adjustable current sharing circuit. These features make the LTC4357HMS8#PBF an ideal choice for power device ORing applications.

Application Field

The LTC4357HMS8#PBF is a multi-purpose OR controller and ideal diode with many applications. It is widely used in remote power systems, such as solar and wind energy systems, to protect DC power sources from over-voltage, under-voltage, shorts and overloads. It can also be used in battery chargers, UPS systems, and DC-DC converters to provide protection from connected batteries. It can also be used in automotive and commercial power systems to protect power devices from an over-voltage condition caused by a sudden increase in voltage.

Other applications include military/avionics/aerospace systems, industrial instrumentation, automated meter reading, and more.

Working Principle

The LTC4357HMS8#PBF is a bi-directional OR controller, which means it can sink or source current. It uses two MOSFETs to provide bi-directional ORing, and can be configured in either a high-side or low-side configuration. The LTC4357HMS8#PBF also includes a true galvanic isolation feature, which keeps the logic signals electrically isolated from the power side. This isolation allows for an improved load transient performance and better noise immunity.

The device is also equipped with an adjustable current-sharing circuit, which allows for reduced power dissipation when connected to multiple power supplies. This feature also eliminates current hogging, which can cause a power device to get hotter than the other connected devices. The current-sharing circuit can be programmed via an external resistor, and is designed to operate up to 80V.

The LTC4357HMS8#PBF is also designed with a low-power standby mode, which reduces the device\'s power consumption when not in use. This makes it suitable for applications that require a lower power consumption while still ensuring reliable operation. The device has an integrated 10A reverse current blocking capability, which prevents current spikes during transitions.

The LTC4357HMS8#PBF also has a built-in temperature monitoring system, which allows for temperature data logging for accurate diagnostics. The device is protected against over-voltage, over-temperature, and ESD damage and can operate in temperatures from -40°C to +125°C.

Conclusion

The LTC4357HMS8#PBF OR controller and ideal diode provide reliable and efficient power management for a variety of applications including remote power systems, instrumentation, automotive, and avionics. Its features include bi-directional ORing, true galvanic isolation, an adjustable current-sharing circuit, reverse current blocking, and an integrated temperature monitoring system. With these features, the LTC4357HMS8#PBF is an ideal choice for a variety of power device ORing applications.

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