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News
Dual Input Prioritizer Provides Low Quiescent Current Backup Supply Switchover Solution
2017-09-14 | ReturnUnlike 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. Device samples and evaluation circuit boards are available online or through your local Analog Devices sales office. For more information, visit www.linear.com/product/LTC4418.
Summary of Features: LTC4418
• Connects Highest Priority Valid Supply to Output
o 1.5% Accurate Undervoltage & Overvoltage Validation
o Adjustable Input Validation Time
• Wide Operating Range: 2.5V to 40V
o –42V Reverse Input Protection
o 60V Tolerant Inputs
• Low 26μA Operating Current
• Blocks Reverse & Cross Conduction Currents
• Cascadable for Additional Input Supplies
• Adjustable Undervoltage & Overvoltage Hysteresis
• 20-Lead 4mm × 4mm QFN Package
Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.
Source:http://www.linear.com/