LTC4420CDD#PBF

LINEAR TECHNOLOGY  LTC4420CDD#PBF  Special Function IC, Power Path Prioritizer, 1.8 V to 18 V in, DFN-12 新

The is an 18V dual input micropower PowerPath prioritizer with back-up supply monitoring in 12 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. Two adjustable voltage monitors set via external resistive dividers provide flexibility in setting V1 to V2 switchover and V2 undervoltage thresholds. V1 is monitored continuously while V2 supply monitoring includes controllable low duty cycle UV monitoring. When primary input V1 drops, the ADJ monitor causes OUT to be switched to V2. When V2 drops, it is disconnected from OUT if active-low V2DIS is low.

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Selects highest priority valid supply from two inputs

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Wide 1.8V to 18V operating range and output current limit of 1.1A at V1, V2 = 8.4V

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Low 3.6µA operating current and low 320nA V2 current when V1 connected to OUT

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Overcurrent and thermal protection

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Fast non-overlap switchover circuitry prevents reverse and cross conduction

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Reverse supply protection to -15V

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V2 freshness seal/ship mode

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±1.5% accurate adjustable switchover threshold

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Freshness seal mode prevents V2 battery discharge during storage or shipment

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Operating temperature range from 0°C to 70°C