ALD810019SCLI

Overview

The ALD810019SCLI is a quad Supercapacitor Auto Balancing (SAB™) MOSFET array manufactured by Advanced Linear Devices, Inc. It utilizes production-proven EPAD® technology to address voltage and leakage-current balancing for up to four supercapacitors connected in series. The device features precision factory-trimmed gate threshold voltages with a typical value of 1.90V at an output current of 1µA. It operates within a commercial temperature range of 0°C to +70°C and is housed in a 16-pin SOIC package.

Feature Summary

• Precision factory trimming ensures accurate operating voltage and current characteristics for each individual SAB MOSFET device.
• Automatically regulates and balances leakage currents across series-connected supercapacitors without external control circuitry.
• Exponential relationship between input voltage and output current allows effective variable resistance behavior for precise balancing.
• Near-zero additional leakage currents are generated when the device is below its rated voltage threshold.

Applications

• Series-connected supercapacitor cell leakage balancing
• Energy harvesting systems requiring voltage regulation
• Long-term backup battery configurations with supercapacitor outputs
• Zero-power voltage dividers at selected reference voltages

Procurement Notes

Verify that the ordering suffix 'L' corresponds to lead-free (RoHS) compliance as specified in the manufacturer's documentation. Confirm the specific package type matches the required pin configuration for your PCB layout. Ensure the operating environment remains within the designated commercial temperature range for this specific part number variant.

Selection Notes

Select the ALD810019SCLI when balancing applications require handling up to four series-connected supercapacitors within a single integrated circuit. This component is suitable for designs where minimizing additional leakage currents is critical. Verify that the maximum drain-source voltage rating aligns with the stack voltage requirements of the target application.

Part Context

This component belongs to the ALD8100xx family of Supercapacitor Auto Balancing MOSFETs. It shares core functionality with the dual-channel ALD910019 but provides four independent balancing channels. The 'SCLI' designation indicates a 16-pin SOIC package with industrial temperature capabilities, though this specific model is rated for commercial temperatures.

Replacement Considerations

The ALD810019SAL serves as a direct package alternative offering the same electrical characteristics in an 8-pin SOIC format. Designers must verify pin compatibility and thermal dissipation limits when substituting between the 16-pin and 8-pin packages.

FAQ

How does the device handle voltage balancing?

The device acts as a voltage-dependent resistor. As the voltage across a supercapacitor rises, the internal resistance decreases exponentially, drawing more current to balance the voltage against other cells in the series stack.

What is the significance of the 1.90V threshold voltage?

The 1.90V gate threshold voltage represents the point where the output current is typically 1µA. This characteristic defines the baseline operating point for the automatic balancing function.

Can this device be used for parallel supercapacitor balancing?

Yes, the datasheet indicates that the SAB MOSFETs can balance series and/or parallel-connected supercapacitors.