MAX38886
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
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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
| 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 |
| 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 |
Technical Docs
| Data Sheet | 2.5V to 5.0V, 0.5A/2.5A, Charge/Discharge Regulator for Supercapacitor Backup Applications | Sep 25, 2020 |
Click any title below to view the detail page where available.
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.
View DetailsFeatures
- 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
 | Tools & Models EE-Sim: Design & Simulate MAX38886 | Create Design |
Support & Training
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Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
Parameters
| 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 |
| 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.
Technical Docs
| Data Sheet | 2.5V to 5.0V, 0.5A/2.5A, Charge/Discharge Regulator for Supercapacitor Backup Applications | Sep 25, 2020 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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