LTC4420
18V Dual Input Micropower
PowerPath Prioritizer with
Backup Supply Monitoring
FEATURES DESCRIPTION Selects Highest Priority Valid Supply from Two
Inputs
n Wide 1.8V to 18V Operating Range
n Internal Dual 2О©, 0.5A Switches
n Low 3.6ВµA Operating Current
n Low 320nA V2 Current When V1 Connected to OUT
n Blocks Reverse and Cross Conduction Currents
n Reverse Supply Protection to –15V
n Built-In V2 Test with Optional V2 Disconnect
n V2 Freshness Seal/Ship Mode
n В±1.5% Accurate Adjustable Switchover Threshold
n В±2.3% Accurate V2 Monitor and Comparator
n Overcurrent and Thermal Protectio Thermally Enhanced 12-Pin 3mm Г— 3mm DFN and 12-Lead Exposed Pad MSOP Packages The LTCВ®4420 is a dual input monolithic PowerPathв„ў
prioritizer, with low operating current, that provides
backup switchover for keeping critical circuitry alive during brownout 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. n APPLICATIONS Low Power Battery Backup Portable Equipment
n Point-of-Sale (POS) Equipment
n Internal 2О©, current limited PMOS switches provide …