MAX38888
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MAX38888

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

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

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1ku List Price Starting From $3.91
Features
  • 2.5V to 5V System Output Voltage
  • 0.8V to 4.5V Cap Voltage Range
  • Up to 2.5A Peak Inductor Discharge Current
  • Programmable Voltage and Current Thresholds
  • ±2% Threshold Accuracy
  • Up to 95% Efficiency, Charge or Discharge
  • 2.5µA Ready Quiescent Current
  • Small Solution Size
    • 3mm x 3mm x 0.75mm TDFN Package
Additional Details
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The MAX38888 is a storage capacitor or capacitor bank backup regulator designed to efficiently transfer power between a storage element and a system supply rail in reversible buck and boost operations using the same inductor.

When the main supply is present and above the minimum system supply voltage, the regulator operates in buck mode and charges the storage element at up to 500mA peak inductor current. Once the storage element is charged, the circuit draws only 2.5µA of current while it maintains the super capacitor or other storage element in its ready state. When the main supply is removed, the regulator operates in boost mode and prevents the system from dropping below the minimum operating voltage, discharging the storage element at up to 2.5A peak inductor current.

The MAX38888 is externally programmable for minimum and maximum voltage of the storage element, such as super capacitor, minimum system voltage, and maximum charge and discharge currents. The internal DC/DC converter requires only a 1µH inductor.

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Applications

  • Handheld Industrial Equipment
  • Portable Computers
  • Portable Devices with a Removable Battery
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Part Models 2
1ku List Price Starting From $3.91
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MAX38888

Documentation

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Data Sheet

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UPDATED 11/18/2020
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MAX38888: 2.5V–5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications Data Sheet (Rev.5)

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Design Note

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UPDATED 09/21/2020
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Using the MAX38888 for Setting Variable Super Capacitor Voltage Discharge Thresholds in Backup Power Applications redirect icon

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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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UPDATED 05/04/2021
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Configure the Charge and Discharge Current Separately in MAX38888 redirect icon

Technical Articles

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UPDATED 01/07/2021
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MAX38888 - Configuring the Backup Voltage Within 5% of the Minimum Charging Voltage redirect icon

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Documentation

Technical Documents 5
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Data Sheet 1

MAX38888: 2.5V–5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications Data Sheet (Rev.5)

Design Note 3

Using the MAX38888 for Setting Variable Super Capacitor Voltage Discharge Thresholds in Backup Power Applications
Voltage balancing techniques for series super capacitor connection for MAX38886/8/9
Configure the Charge and Discharge Current Separately in MAX38888

Technical Articles 1

MAX38888 - Configuring the Backup Voltage Within 5% of the Minimum Charging Voltage

Book & eBook 1

Power You Can Trust: Achieving Efficient Battery-Powered Solutions

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2022-10-04

11:06

Introduction to the MAX38888 Super Cap Regulator

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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.

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Software & Part Ecosystem

Evaluation Kits 1

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MAX38888EVKIT

Evaluation Kit for the MAX38888

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MAX38888EVKIT

Evaluation Kit for the MAX38888

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MAX38888EVKIT
Evaluation Kit for the MAX38888

Features and Benefits

  • 2.99V to 3.36V System Output Voltage Range
  • 1.42V to 2.71V Super Cap Voltage Range
  • 2.5A Peak Discharge Current
  • Resistor Adjustable Voltage and Current Thresholds
  • Proven 2-Layer 2oz Copper PCB Layout
  • Demonstrates Compact Solution Size
  • Fully Assemble and Tested
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Product Detail

The MAX38888 evaluation kit (EV kit) evaluates the MAX38888 IC. The MAX38888 is a super cap backup regulator designed to transfer power between a super cap and a system supply rail. When the main battery is present and above the minimum system supply voltage, the regulator charges the super cap at up to a 500mA rate. Once the super cap is charged, the circuit draws only 2.5μA of current while it maintains the super cap in its ready state. When the main battery is removed, the regulator prevents the system from dropping below the minimum operating voltage, discharging the super cap at up to a 2.5A rate. The MAX38888 is externally programmable for minimum and maximum super cap voltage, minimum system voltage, and maximum charge and discharge currents. The internal DC/DC converter requires only a 1μH inductor.

Applications

  • Handheld Industrial Equipment
  • Portable Computers
  • Portable Devices with a Removable Battery

Resources

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MAX38888EVKIT BOM Download

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MAX38888EVKIT ODB File - Design Files Download

2.94 M

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MAX38888EVKIT

Evaluation Kit for the MAX38888

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