MAX38889
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MAX38889

2.5V–5.5V, 3A Reversible Buck/Boost Regulator for Backup Power Applications

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Continua™ Family of Backup Power Regulators Using Super Capacitor or Capacitor Bank

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
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1ku List Price Starting From $2.89
Features
  • 2.5V to 5.5V System Output Voltage Range
  • 0.5V to 5.5V Supercapacitor Voltage Range
  • ±1% Threshold Accuracy
  • 2.5% Hysteresis between Backup and Charging
  • 1A to 3A Peak Inductor Current Limit
    • Peak Inductor Current Is Pin-Programmable over 1A to 3A through External Resistor
  • 94% Peak Efficiency, Charging or Discharging Mode
  • 4µA Quiescent Current in Ready State
    • After Supercapacitor Is Charged, Draws only 4µA of Quiescent Current
  • Ready and Backup State Outputs
    • RDY and BKB Flags Provide Real-Time Status to System
  • 3mm x 3mm, 16-Pin TQFN Package
Additional Details
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Applications

  • Aftermarket Automotive Tracking
  • Handheld Industrial Equipment
  • Industrial Sensor and Actuators
  • Portable Devices/Computers with Removable Battery
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file View Data Sheet (Rev.1)
Documentation View All Documentation
Part Models 2
1ku List Price Starting From $2.89
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MAX38889

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Data Sheet

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UPDATED 05/07/2021
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MAX38889: 2.5V–5.5V, 3A Reversible Buck/Boost Regulator for Backup Power Applications Data Sheet (Rev.1)

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UPDATED 09/20/2021
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Voltage balancing techniques for series super capacitor connection for MAX38886/8/9 redirect icon

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Documentation

Documentation

Book & eBook 1

Power You Can Trust: Achieving Efficient Battery-Powered Solutions

Rarely Asked Question Page 1

How to Design a Simple, Uninterruptible Power Supply with Supercapacitors

Webcast 1

Design Efficient Power Solutions for Battery-powered Applications

Video

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Video

2022-10-04

03:53

Next Generation Power Supply Backup with MAX38889

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Video

2022-10-04

07:53

Introduction to the MAX38889 2.5V – 5.5V, 3A Reversible Buck/Boost Regulator for Backup Power Applications

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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
MAX38889AATE+ 16-LFCSP-3X3X0.75 external-link
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MAX38889AATE+T 16-LFCSP-3X3X0.75 external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
Software & Part Ecosystem

Software & Part Ecosystem

Parts Product Life Cycle Description

Internal Power Switch Boost Regulators2
MAX38888
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PRODUCTION

2.5V–5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications

MAX38886
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Cart

PRODUCTION

2.5V to 5.0V, 0.5A/2.5A, Charge/Discharge Regulator for Supercapacitor Backup Applications

Evaluation Kit

Evaluation Kits 2

MAX38889AEVKIT

Evaluation Kit for the MAX38889

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MAX38889AEVKIT

Evaluation Kit for the MAX38889

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MAX38889AEVKIT
Evaluation Kit for the MAX38889

Features and Benefits

  • 2.5V to 5.5V System Output Voltage Range
  • 0.5V to 5.5V Supercapacitor Voltage Range
  • 3A Peak Charging and Backup Inductor Currents
  • Resistor-Adjustable VSYS, VCAP Voltages
  • Resistor-Adjustable Charging and Backup Currents
  • Proven Two-Layer, 2oz Copper PCB Layout
  • Demonstrates Compact Solution Size
  • Fully Assembled and Tested
Buy Now View Details

Product Detail

The MAX38889A evaluation kit (EV kit) evaluates the MAX38889 supercapacitor backup regulator, which is designed to transfer power between a supercapacitor and a system supply rail. When the main battery is present and above the minimum system voltage for charging, the MAX38889 charges the supercapacitor with an average current of 1.5A.

Once the supercapacitor is charged, the circuit draws only 4µA of current while it maintains the supercapacitor in its ready state. When the main battery is removed, the MAX38889 draws power from the supercapacitor and regulates the system voltage to the set backup voltage with a programmed maximum peak inductor current of 3A. The MAX38889 is externally programmable for maximum supercapacitor voltage, system backup voltage, peak charging, and peak backup inductor currents.

Applications

  • Aftermarket Automotive Tracking
  • Handheld Industrial Equipment
  • Industrial Sensor and Actuators
  • Portable Devices/Computers with Removable Battery

Resources

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MAX38889AEVKIT BOM Download

39.52K

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MAX38889AEVKIT Design Files Download

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MAXESSENTIAL02EP

Essential Analog Efficient Power Toolkit for the MAXM38643 / MAX38640 / MAX77839 / MAXM17225 / MAX17227A / MAX38889 / MAX38902C / MAX38913 / MAX77827

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MAXESSENTIAL02EP

Essential Analog Efficient Power Toolkit for the MAXM38643 / MAX38640 / MAX77839 / MAXM17225 / MAX17227A / MAX38889 / MAX38902C / MAX38913 / MAX77827

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Download

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Print
MAXESSENTIAL02EP
Essential Analog Efficient Power Toolkit for the MAXM38643 / MAX38640 / MAX77839 / MAXM17225 / MAX17227A / MAX38889 / MAX38902C / MAX38913 / MAX77827

Features and Benefits

  • Enables Immediate Testing of Nine Different Power Solutions
  • Includes nanoPower Buck and Boost Converters and Modules, Buck/Boost Converter, LDOs, and Continua Supercapacitor Backup Power Controller
  • Boards Designed to Accept 0.100” (2.54mm) Header Pin Strips for Mounting on Breadboards
  • Through Holes Accept Test Points for Connecting to Benchtop Equipment
Buy Now View Details

Product Detail

The MAXESSENTIAL02EP Essential Analog Efficient Power toolkit delivers products on ready-to-use boards for immediate testing and prototyping. The Essential Analog Efficient Power toolkit features products from the Buck, Boost, Buck-Boost, LDO, and Continua™ product categories. The selection also features nanoPower switching converter and module options.

Evaluation Kits2

MAX38889AEVKIT

Evaluation Kit for the MAX38889

MAXESSENTIAL02EP

Essential Analog Efficient Power Toolkit for the MAXM38643 / MAX38640 / MAX77839 / MAXM17225 / MAX17227A / MAX38889 / MAX38902C / MAX38913 / MAX77827
Tools & Simulations

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