LTC4419

RECOMMENDED FOR NEW DESIGNS

18V Dual Input Micropower PowerPath Prioritizer

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Part Models
8
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Part Details

  • 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
LTC4419
18V Dual Input Micropower PowerPath Prioritizer
LTC4419 - Typical Application Image 1 LTC4419 - Typical Application Image 2 LTC4419 - Package Image 1 LTC4419 - Package Image 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Low Voltage Hot Swap Controllers 1
LTC4231
RECOMMENDED FOR NEW DESIGNS Micropower Hot Swap Controller
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC4419
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

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schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC2160A

LTC4419CDD Demo Board | 18V Dual Input Micropower PowerPath Prioritizer

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Product Details

Demonstration circuit 2160A uses the LTC4419 to provide backup switchover, keeping the output load powered during brown out or power loss conditions. Priority is assigned by supply connection to the V1 and V2 inputs. The power source connected to V1 has a higher priority and is monitored by undervoltage switchover threshold comparator CADJ (pin ADJ). If V1 exceeds 1.55V and ADJ is above 1.097V for 64ms, V1 is considered valid, and the LTC4419 connects V1 to the load. If V1 drops below 1.52V, or ADJ drops below 1.047V, V1 is considered invalid, and the LTC4419 powers the load from V2. The DC2160A is populated to provide switchover when V1 drops below 10.19V ±0.33V. The upper limit for V1 is the maximum operating voltage, 18V; however, the recommended V1 voltage is 12V. The resistive divider (R1-R2) of the first auxiliary comparator CMP1 is adjusted to trigger the comparator when VCMP1_TOP’s voltage is in the 9.92V to 10.74V range. Practically, any voltage from the operating range can be selected for V2, however, 5V is recommended to have a standard voltage level.


 
DC2160A
LTC4419CDD Demo Board | 18V Dual Input Micropower PowerPath Prioritizer
DC2160A Demo Board DC2160A Demo Board DC2160A Demo Board DC2160A Demo Board DC2160A - Schematic

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