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LTC3388-3 Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LTC3388-3 Datasheet(HTML) 1 Page - Linear Integrated Systems |
1 / 20 page LTC4419 1 4419f For more information www.linear.com/LTC4419 Typical applicaTion FeaTures DescripTion 18V Dual Input Micropower PowerPath Prioritizer The LTC®4419 is a dual input monolithic PowerPath™ prioritizerwithlowoperatingcurrent,thatprovidesbackup 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. Internal2Ω,currentlimitedPMOSswitchesprovidepower 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 minimizing output droop. The LTC4419 has two auxiliary 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. applicaTions n Selects Highest Priority Valid Supply from Two Inputs n Wide 1.8V to 18V Operating Range n Internal Dual 2Ω, 0.5A Switches n Low 3.6µA 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 V2 Freshness Seal/Ship Mode n ±1.5% Accurate Adjustable Switchover Threshold n Two Auxiliary ±2.3% Accurate Voltage Comparators n Overcurrent and Thermal Protection n Thermally Enhanced 10-Pin 3mm × 3mm DFN and 12-Lead Exposed Pad MSOP Packages n Low Power Battery Backup n Portable Equipment n Point-of-Sale (POS) Equipment L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. + 1M 1M V2ON 1M 5V WALL ADAPTER 237k C1 10µF 121k 4.02M 7.4V Li-Ion 280k V1 OUT OUT V1UV V2UV CMPOUT1 CMPOUT2 V2ON ADJ CMP1 CMP2 4419 TA01a SWITCHOVER THRESHOLD: V1 < 4V (V1 FALLING) GND LTC4419 V2 V2UV THRESHOLD: V2 < 6V (V2 FALLING) V1UV THRESHOLD: V1 < 4.4V (V1 FALLING) Typical Switchover Waveforms SWITCHOVER THRESHOLD COUT = 10µF ILOAD = 100mA OUT 50µs/DIV V2 2V/DIV V1 2V/DIV 4419 TA01b |
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