MAX38889

RECOMMENDED FOR NEW DESIGNS

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

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

Data Sheet (Rev. 1)
Product Selection Table
Part Models
2
1ku List Price
Starting From $2.89
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Part Details

  • 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
MAX38889
2.5V–5.5V, 3A Reversible Buck/Boost Regulator for Backup Power Applications
MAX38889 Functional Diagram MAX38889 Simplified Application Diagram MAX38889 Application Circuit MAX38889 Pin Configuration
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Documentation

Data Sheet 1

Design Note 1

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Hardware Ecosystem

Parts Product Life Cycle Description
Internal Power Switch Boost Regulators 2
MAX38888
PRODUCTION 2.5V–5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications
MAX38886
PRODUCTION 2.5V to 5.0V, 0.5A/2.5A, Charge/Discharge Regulator for Supercapacitor Backup Applications
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Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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Evaluation Kits

MAX38889AEVKIT

Evaluation Kit for the MAX38889

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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

Product Details

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

MAXESSENTIAL02EP

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

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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

Product Details

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.
MAX38889AEVKIT
Evaluation Kit for the MAX38889
MAXESSENTIAL02EP
Essential Analog Efficient Power Toolkit for the MAXM38643 / MAX38640 / MAX77839 / MAXM17225 / MAX17227A / MAX38889 / MAX38902C / MAX38913 / MAX77827

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