LTC4419

LTC4419 18V Dual Input Micropower PowerPath Prioritizer FEATURES DESCRIPTION nn Selects Highest Priority Valid Supply from Two Inputs nn Wide 1.8V to 18V Operating Range nn Internal Dual 2Ω, 0.5A Switches nn Low 3.6µA Operating Current nn Low 320nA V2 Current When V1 Connected to OUT nn Blocks Reverse and Cross Conduction Currents nn Reverse Supply Protection to –15V nn V2 Freshness Seal/Ship Mode nn ±1.5% Accurate Adjustable Switchover Threshold nn Two Auxiliary ±2.3% Accurate Voltage Comparators nn Overcurrent and Thermal Protection nn Thermally Enhanced 10-Pin 3mm × 3mm DFN and 12-Lead Exposed Pad MSOP Packages APPLICATIONS nn Low Power Battery Backup nn Portable Equipment nn Point-of-Sale (POS) Equipment The LTC®4419 is a dual input monolithic PowerPath™ prioritizer with low operating current, that provides backup switchover for keeping critical circuitry alive during brown out and power loss conditions. Unlike diode-OR products, little current is drawn from the inactive supply even if its voltage is greater than the active supply. Internal 2Ω, current limited PMOS switches provide power path selection from a primary input (V1) or a backup input (V2) to the output. An adjustable voltage monitor set via an external resistive divider provides flexibility in setting the V1 to V2 switchover threshold. When primary input V1 drops, the ADJ monitor input causes OUT to be switched to V2. Fast non-overlap switchover circuitry prevents both reverse and cross conduction while mi...