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Electrical equipment and electronic components

Dual-input prioritizer provides low quiescent current backup

By Analog Devices incorporates Linear Technology on 15th September 2017

Product Details Supplier Info More products

Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC4418, a dual input power prioritizer for 2.5V to 40V systems. To enable portability, preserve memory during brownouts, and ensure a graceful shutdown on power loss, electronic systems employ batteries and capacitors for backup power. The LTC4418 normally powers the load from the higher priority main supply such as a wall adapter or main battery, switching to the backup supply—typically a battery or large value capacitor—during primary brownout or power loss conditions. With up to 40V operating capability, the LTC4418 accommodates a wide range of power sources such as wall adapters, USB ports, supercapacitors, and multicell lead-acid, Li-Ion, or NiMH batteries. A low 26µA operating quiescent current and a shutdown mode make the LTC4418 ideal for portable battery-operated systems.

Unlike diode-based solutions, the LTC4418 does not require the backup supply voltage to be lower than the main voltage. External back-to-back P-channel MOSFET switches multiplex from the primary to the backup input when the primary goes out of the valid voltage window setup with adjustable and precise undervoltage and overvoltage thresholds. Carefully designed break-before-make fast switch control blocks reverse and cross conduction currents while minimizing output voltage droop. An external capacitor sets the time that a supply needs to stay within its voltage window before being considered valid. Reversed input voltages up to −42V are blocked, protecting the load.

More than two supplies are prioritized by cascading any combination of LTC4418 and the triple-supply LTC4417. Specified over the 0°C to 70°C commercial and −40°C to 85°C industrial temperature ranges, the LTC4418 is offered in a 20-lead 4mm x 4mm QFN package. 1,000-piece pricing starts at $2.45 each.

Analog Devices

Analog Devices, Inc. operates at the centre of the modern digital economy, converting real-world phenomena into actionable insight with its comprehensive suite of analogue and mixed signal, power management, radio frequency (RF), and digital and sensor technologies. ADI serves 125,000 customers worldwide with more than 75,000 products in the industrial, communications, automotive, and consumer markets. ADI is headquartered in Wilmington, MA, USA.

Visit our website 01932 358530

Analog Devices, Inc. operates at the centre of the modern digital economy, converting real-world phenomena into actionable insight with its comprehensive suite of analogue and mixed signal, power management, radio frequency (RF), and digital and sensor technologies. ADI serves 125,000 customers worldwide with more than 75,000 products in the industrial, communications, automotive, and consumer markets. ADI is headquartered in Wilmington, MA, USA. Visit http://www.analog.com.

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