ALD810021SCLI

Special Purpose Overview

The ALD810021SCLI is a quad Supercapacitor Auto Balancing (SAB) MOSFET array from Advanced Linear Devices, designed for balancing up to four series-connected supercapacitors. It utilizes EPAD technology with a precision gate threshold voltage of 2.10V at 1µA drain-source current. The device operates within a supply voltage range of 0V to +15V and features an operating temperature range of -40°C to +85°C. Output currents vary exponentially from 0.0001µA to 10000µA based on input voltage, enabling precise leakage current regulation.

Special Purpose Feature Summary

• Automatically regulates and balances leakage currents across series-connected supercapacitors
• Precision factory trimmed gate threshold voltage ensures accurate voltage limiting
• Exponential output current response provides effective variable resistance control
• Near zero additional leakage currents minimize power dissipation

Special Purpose Applications

• Series-connected supercapacitor cell leakage balancing
• Energy harvesting systems
• Long term backup battery with supercapacitor outputs
• Zero-power voltage divider at selected voltages

Special Purpose Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature rating (-40°C to +85°C). Confirm the 'CL' package designation corresponds to the 16-pin SOIC format. Ensure compatibility with the required maximum supply voltage of 15V and check that the static discharge protection measures are adequate for handling this ESD sensitive component during assembly.

Special Purpose Selection Notes

Select the ALD810021 variant when balancing four supercapacitors in series; use the ALD910021 for two-cell stacks. Verify that the maximum desired operating voltage aligns with the device's exponential current characteristics. Ensure the application environment falls within the specified commercial or industrial temperature ranges to maintain precision performance.

Special Purpose Part Context

This component belongs to the ALD8100xx family of SAB MOSFET arrays. It is manufactured using Advanced Linear Devices' proprietary EPAD technology. The device integrates multiple matched MOSFETs into a single package to provide scalable solutions for supercapacitor balancing without requiring external discrete components.

Special Purpose Replacement Considerations

The ALD810021SCL serves as the commercial grade equivalent with a 0°C to +70°C operating range. The ALD910021SCLI is the dual-channel alternative suitable for balancing two supercapacitors instead of four.

Special Purpose FAQ

How does the ALD810021SCLI regulate supercapacitor voltage?

It acts as a voltage-dependent resistor where the output current increases exponentially as the input voltage rises above the 2.10V threshold, shunting excess charge to prevent over-voltage.

What is the maximum supply voltage for this device?

The absolute maximum rating for the V+ to V- voltage is 15.0V.

Does the device consume significant power when balancing low-voltage cells?

No, when the input voltage is below approximately 1.90V, the output current drops to negligible levels (e.g., 0.01µA), resulting in essentially zero power dissipation.