LTC4425
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LTC4425

Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor

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LTspice LTC4425 - Power Management Download 1.51 KB
Part Models 8
1ku List Price Starting From $2.72
Features
  • 50mΩ Ideal Diode from VIN to VOUT
  • Smart Charge Current Profile Limits Inrush Current
  • Internal Cell Balancer (No External Resistors)
  • Programmable Output Voltage (LDO Mode)
  • Programmable VIN to VOUT Current Limit
  • Continuous Monitoring of VIN to VOUT Current via PROG Pin
  • Low Quiescent Current: 20μA
  • VIN Power Fail, PGOOD Indicator
  • 2.45V/2.7V Cell Protection Shunts (4.9V/5.4V SuperCap Max Top-Off Voltage)
  • 3A Peak Current Limit, Thermal Limiting
  • Tiny Application Circuit, 3mm × 3mm × 0.75mm DFN and 12-Lead MSOP Packages
Additional Details
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The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply. The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low average power applications. The LTC4425 charges the output capacitors to an externally programmed output voltage in LDO mode at a constant charge current, or to VIN in normal mode with a smart charge current profile to limit the inrush current until the VIN to VOUT differential is less than 250mV. In addition the LTC4425 can be set to clamp the output voltage to 4.9V or 5.4V.

Charge current (VOUT current limit) is programmed by connecting a resistor between PROG and GND. The voltage on the PROG pin represents the current fl owing from VIN to VOUT for current monitoring. An internal active balancing circuit maintains equal voltages across each supercapacitor and clamps the peak voltage across each cell to a pin-selectable maximum value. The LTC4425 operates at a very low 20μA quiescent current (shutdown current <3μA) and is available in a low profile 12-pin 3mm × 3mm DFN or a 12-lead MSOP package.

Applications

  • High Peak Power Battery/USB Powered Equipment
  • Industrial PDAs
  • Portable Instruments/Monitoring Equipment
  • Power Meters, SuperCap Backup Circuits
  • PC Card/USB Modems
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file View Data Sheet
Documentation View All Documentation
LTspice LTC4425 - Power Management Download 1.51 KB
Part Models 8
1ku List Price Starting From $2.72
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LTC4425

Documentation

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Data Sheet

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UPDATED 02/16/2016
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LTC4425: Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor Data Sheet

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UPDATED 02/13/2013
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LTC4425: 電流制限付き理想ダイオードとV/I モニタを備えたリニア・スーパーキャパシタ・チャージャ データシート

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User Guide

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UPDATED 05/05/2010
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DC1589A - Demo Boards redirect icon

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Reliability Data

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UPDATED 03/26/2018
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R540 Reliability Data redirect icon

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Design Note

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UPDATED 09/06/2022
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Design Note 485: Complete Energy Utilization Improves Run Time of a Supercap Ride-Through Application by 40% redirect icon

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UPDATED 01/01/2012
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Supercapacitor Charger and Ideal Diode for Power Supply Ride-Through Systems redirect icon

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Documentation

Technical Documents 5
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Data Sheet 1

LTC4425: Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor Data Sheet

Reliability Data 1

R540 Reliability Data

User Guide 1

DC1589A - Demo Boards

Design Note 1

Design Note 485: Complete Energy Utilization Improves Run Time of a Supercap Ride-Through Application by 40%

Technical Articles 1

Supercapacitor Charger and Ideal Diode for Power Supply Ride-Through Systems

Video

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Video

2017-09-18

LTC4425 2A Linear Supercapacitor Charger with Ideal Diode

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC4425EDD#PBF 12-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC4425EDD#TRPBF 12-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC4425EMSE#PBF 12-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC4425EMSE#TRPBF 12-Lead MSOP w/ EP external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC4425IDD#PBF 12-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC4425IDD#TRPBF 12-Lead DFN (3mm x 3mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
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  • Reliablity Data external-link
LTC4425IMSE#PBF 12-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC4425IMSE#TRPBF 12-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link

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PCN

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC4425EMSE#PBF

PRODUCTION

LTC4425EMSE#TRPBF

PRODUCTION

LTC4425IMSE#PBF

PRODUCTION

LTC4425IMSE#TRPBF

PRODUCTION

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PCN22_0244_Form

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Material_Report

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Qualification Results Summary

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Delta Qualification Matrix

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Feb 4, 2020

- 20_0129

Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LTC4425EMSE#PBF

PRODUCTION

LTC4425EMSE#TRPBF

PRODUCTION

LTC4425IMSE#PBF

PRODUCTION

LTC4425IMSE#TRPBF

PRODUCTION

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PCN20_0129_Form

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Material_Report

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Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

arrow down

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC4425EMSE#PBF

PRODUCTION

LTC4425EMSE#TRPBF

PRODUCTION

LTC4425IMSE#PBF

PRODUCTION

LTC4425IMSE#TRPBF

PRODUCTION

pdf

PCN22_0244_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download
Feb 4, 2020

- 20_0129

arrow down

Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LTC4425EMSE#PBF

PRODUCTION

LTC4425EMSE#TRPBF

PRODUCTION

LTC4425IMSE#PBF

PRODUCTION

LTC4425IMSE#TRPBF

PRODUCTION

pdf

PCN20_0129_Form

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xls

Material_Report

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Evaluation Kits 1

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DC1589A

LTC4425EDD Demo Board | Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor

Evaluation Kits1

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DC1589A

LTC4425EDD Demo Board | Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LTC4425 - Power Management Download

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