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

Family of Backup Power Regulators Using Supercapacitor or Capacitor Bank

Product Details

The MAX38886 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 supercapacitor 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 MAX38886 is externally programmable for minimum and maximum voltage of the storage element, such as supercapacitor, minimum system voltage, and maximum charge and discharge currents. The internal DC-DC converter requires only a 1µH inductor.

Key Features

  • 2.5V to 5V System Output Voltage
  • Up to 4.5V Capacitor 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
Parametric specs for Battery Chargers
Charging VIN (V) (max) 5.5
Max. ICHG (A) 2.5
Cell Chemistry Supercapacitor
Charger (V) 0.8 to 5
Oper. Temp. (°C) -40 to +125
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 4.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 2.5
Switch Type Internal
Output Adjust. Method Resistor
ICC (mA) (typ) 0.035
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k
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Simplified Block Diagram

MAX38886: Typical Application Circuit MAX38886:Typical Application Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX38886 evaluation kit (EV kit) evaluates the MAX38886 IC. The MAX38886 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 3µA 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 peak inductor current. Multiple MAX38886 ICs can be connected in parallel for higher current applications. The MAX38886 is externally programmable for mini- mum and maximum super cap voltage, minimum system voltage, and maximum charge and discharge currents. The internal DC-DC converter requires only a 1µH inductor and a 22µF capacitor.

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Features

  • 2.99V to 3.36V System Output Voltage Range
  • 0.5V 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
  • Compact Solution Size
  • Fully Assembled and Tested

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Tools & Models

EE-Sim: Design & Simulate MAX38886

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 5.5
Max. ICHG (A) 2.5
Cell Chemistry Supercapacitor
Charger (V) 0.8 to 5
Oper. Temp. (°C) -40 to +125
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 4.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 2.5
Switch Type Internal
Output Adjust. Method Resistor
ICC (mA) (typ) 0.035
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k

Key Features

  • 2.5V to 5V System Output Voltage
  • Up to 4.5V Capacitor 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

Description

The MAX38886 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 supercapacitor 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 MAX38886 is externally programmable for minimum and maximum voltage of the storage element, such as supercapacitor, minimum system voltage, and maximum charge and discharge currents. The internal DC-DC converter requires only a 1µH inductor.

Simplified Block Diagram

MAX38886: Typical Application Circuit MAX38886:Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal