LTC4419CDD#PBF

The LTC4419CDD#PBF is an 18V dual input micropower PowerPath prioritizer in 10 pin DFN package. This monolithic PowerPath prioritizer with low operating current provides back-up switchover for keeping critical circuitry alive during brown out and power loss conditions. Unlike diode-OR products, little current is drawn from inactive supply even if its voltage is greater than active supply. Internal dual 2ohm, 0.5A current limited PMOS switches provide power path selection from a primary input (V1) or a backup input (V2) to output. An adjustable voltage monitor set via an external resistive divider provides flexibility in setting V1 to V2 switchover threshold. When primary input V1 drops, the ADJ monitor input causes OUT to be switched to V2. The LTC4419 has two auxiliary ±2.3% accurate comparators with open-drain outputs that provide flexible voltage monitoring. The V2ON output indicates if V2 is powering OUT. Freshness seal mode prevents V2 battery discharge during storage or shipment.

• Selects highest priority valid supply from two inputs
• Wide 1.8V to 18V operating range
• Low 3.6µA operating current and low 320nA V2 current when V1 connected to OUT
• Overcurrent and thermal protection
• Output current limit of 1.1A at V1, V2 = 8.4V
• Reverse supply protection to -15V
• V2 freshness seal/ship mode
• ±1.5% accurate adjustable switchover threshold
• Fast non-overlap switchover circuitry prevents both reverse and cross conduction
• Operating temperature range from 0°C to 70°C