Ensures continuous power supply even if there is a problem with the main power supply

Analog Devices announced the development of the LTC4091, a lithium-ion battery backup management system.

This product is intended for 3.45V to 4.45V power supply rails that require continuous power during prolonged main power failures. The LTC4091 features a 36V monolithic buck converter with adaptive output control to power the system load and enable high-efficiency battery charging from the buck output.

When external power is available, the device can provide up to 2.5A of total output current and up to 1.5A of charge current for a single-cell 4.1V or 4.2V Li-ion battery. If the primary input source fails and can no longer power the load, the LTC4091 provides up to 4A to the system output load from the backup Li-ion battery via an internal ideal diode, or unlimited current if an external ideal diode transistor is used.

To protect sensitive downstream loads, the maximum output load voltage is 4.45 V. The device's PowerPathTM control feature provides seamless, uninterrupted transition between input power and backup power during a power fail event and provides reverse blocking even during input shorts.

These products are typically used in applications such as fleet and asset tracking, automotive GPS data loggers and telematics systems, security systems, communications and industrial backup systems.

The LTC4901 includes an absolute maximum input overvoltage protection of 60 V, ensuring the IC can withstand high input voltage transients. The LTC4091's battery charger provides two pin-selectable charge voltages optimized for Li-Ion battery backup applications.