MAX38888

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

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


Please check latest availability status for a specific part variant.

Description

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.

MAX38888: Typical Operating Circuit MAX38888: Typical Operating Circuit Enlarge+

Key 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

Applications/Uses

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

See parametric specs for Battery Chargers (72)


Part NumberLithium Ion CellsCharging VIN
(V)
Charge Rate Set byMax. ICHG
(A)
Charge TerminationCharge RegulationDesign ToolsOper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX38888 15.5Preset0.28Max. VoltageSwitchmodeEE-Sim-40 to +125
TDFN-CU/14
$3.13 @1k

See parametric specs for Step-Up Switching Regulators (101)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypeICC
(mA)
DC-DC OutputsOper. Freq.
(kHz)
Package/Pins
minmaxminmaxmaxtyp
MAX38888 0.84.52.552.5ResistorInternal0.03512000
See Data Sheet

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX38888EVKIT: Evaluation Kit for the MAX38888

Additional Resources

Super Capacitor Calculator (XLSM)


Tools & Models

  • EE-Sim: Design & Simulate MAX38888
  • Request Reliability Report for: MAX38888 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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