LTC4419CMSE#PBF, PowerPath Prioritiser, Dual Input, Monolithic, 1.8 to 18 V, 0 to 70 Deg C, MSOP-EP-12

LTC®4419 is a dual input monolithic PowerPath™ 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. Internal 2ohm, currently 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. Application includes low-power battery backup, portable equipment, and point-of-sale (POS) equipment.

• Selects highest priority valid supply from two inputs
• Blocks reverse and cross conduction currents
• V2 freshness seal/ship mode
• Overcurrent and thermal protection
• Operating voltage range from 1.8 to 18V (TA = 25°C, V1 = 3.6V)
• Typical switch resistance is 2ohm (V1 = V2 = 5V, IOUT = -100mA, TA = 25°C)
• Typical ADJ threshold is 1.047V (ADJ falling, TA = 25°C)
• Typical output current limit is 1.1A (V1, V2 = 8.4V, TA = 25°C)
• 12-lead plastic exposed pad MSOP package
• Temperature rating range from 0°C to 70°C