LTC4420

RECOMMENDED FOR NEW DESIGNS

18V Dual Input Micropower PowerPath Prioritizer with Backup Supply Monitoring

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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
  • Built-In V2 Test with Optional V2 Disconnect
  • V2 Freshness Seal/Ship Mode
  • ±1.5% Accurate Adjustable Switchover Threshold
  • ±2.3% Accurate V2 Monitor and Comparator
  • Overcurrent and Thermal Protection
  • Thermally Enhanced 12-Pin 3mm × 3mm DFN and 12-Lead Exposed Pad MSOP Packages
LTC4420
18V Dual Input Micropower PowerPath Prioritizer with Backup Supply Monitoring
LTC4420 - Typical Application Image 1 LTC4420 - Typical Application Image 2 LTC4420 - Package Image 1 LTC4420 - 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:

  • LTC4420
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

eval board
schematic 1
DC2208A

LTC4420CDD Demo Board | 18V Dual Input Micropower PowerPath Prioritizer with Backup Supply Monitoring

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Product Details

Demonstration circuit DC2208A uses the LTC4420 to provide backup switchover, keeping the output load powered during brownout or power loss conditions. Priority is assigned by supply connection to the V1 and V2 inputs. The power source connected to the V1 input has a higher priority, and it is monitored continuously by adjustable comparator (ADJ) with the proper threshold arranged by an external resistive divider. If the input voltage V1 exceeds 1.55V (1.8V worst case) and the ADJ pin is above 1.097V for at least 64ms after V1 has powered up, and then stays above 1.047V, V1 is considered valid, and the LTC4420 connects V1 to load (OUT pin). If V1 drops below 1.52V, or the ADJ pin voltage is lower than 1.047V, V1 is considered invalid, and LTC4420 switches V2 to load, if the V2DIS pin voltage is above 0.9V. If the V2DIS pin voltage is below 0.2V, V2 to load connection is activated only if V2UV is >0.387V.


 
DC2208A
LTC4420CDD Demo Board | 18V Dual Input Micropower PowerPath Prioritizer with Backup Supply Monitoring
DC2208A - Schematic

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