LTC4419 - 18V Dual Input Micropower PowerPath Prioritizer


  • Selects Highest Priority Valid Supply from Two Inputs
  • Wide 1.8V to 18V Operating Range
  • Internal Dual 2Ω, 0.5A Switches
  • Low 3.6µA Operating Current
  • Low 320nA V2 Current When V1 Connected to OUT
  • Blocks Reverse and Cross Conduction Currents
  • Reverse Supply Protection to –15V
  • V2 Freshness Seal/Ship Mode
  • ±1.5% Accurate Adjustable Switchover Threshold
  • Two Auxiliary ±2.3% Accurate Voltage Comparators
  • Overcurrent and Thermal Protection
  • Thermally Enhanced 10-Pin 3mm × 3mm DFN and 12-Lead Exposed Pad MSOP Packages

Typical Application

LTC4419 Typical Application
LTC4419 Typical Application


The LTC®4419 is a dual input monolithic PowerPath™ prioritizer with low operating current, that provides backup 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.

Internal 2Ω, current 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. 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. 


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4419CDD#PBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4419CDD#TRPBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4419CMSE#PBF MS-12E MSE C 05-08-1666 Yes
LTC4419CMSE#TRPBF MS-12E MSE C 05-08-1666 Yes
LTC4419IDD#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4419IDD#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4419IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LTC4419IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes

LTC4419 Package Drawing
LTC4419 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC4419CDD#PBF 3x3 DFN-10 C $3.93 $2.75 Yes
LTC4419CDD#TRPBF 3x3 DFN-10 C $3.99 $2.81 Yes
LTC4419CMSE#PBF MS-12E C $3.93 $2.75 Yes
LTC4419CMSE#TRPBF MS-12E C $3.99 $2.81 Yes
LTC4419IDD#PBF 3x3 DFN-10 I $4.52 $3.16 Yes
LTC4419IDD#TRPBF 3x3 DFN-10 I $4.58 $3.22 Yes
LTC4419IMSE#PBF MS-12E I $4.52 $3.16 Yes
LTC4419IMSE#TRPBF MS-12E I $4.58 $3.22 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2160A LTC4419CDD Demo Board | 18V Dual Input Micropower PowerPath Prioritizer $75.00
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  • Low Power Battery Backup
  • Portable Equipment
  • Point-of-Sale (POS) Equipment

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