ALD910022SAL

Special Purpose Overview

The ALD910022SAL is a dual-channel Supercapacitor Auto Balancing (SAB) MOSFET array manufactured by Advanced Linear Devices Inc. It utilizes EPAD technology to automatically regulate and balance leakage currents in series-connected supercapacitors, preventing over-voltages. The device features a precision factory-trimmed gate threshold voltage of 2.20V at an output current of 1µA. Its effective resistance varies exponentially with the input voltage, allowing for precise balancing without external control circuitry.

Special Purpose Feature Summary

• Automatically regulates and balances leakage currents across series-connected supercapacitors
• Features precision factory-trimmed gate threshold voltage characteristics
• Provides near-zero additional leakage currents when below rated voltages
• Offers fast response time with active operation across varying cell voltages

Special Purpose Applications

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

Special Purpose Procurement Notes

Verify the specific suffix 'L' indicates lead-free RoHS compliance as per manufacturer ordering information. Confirm the operating temperature range matches application requirements; the SAL package supports commercial temperatures from 0°C to +70°C, while the SALI variant covers industrial ranges. Ensure static control procedures are followed due to ESD sensitivity.

Special Purpose Selection Notes

Select the ALD910022SAL for applications requiring automatic balancing of up to two series-connected supercapacitors. This dual-channel configuration is suitable for lower-capacity stacks compared to the quad-channel ALD810022. Consider the exponential current-voltage relationship for precise balancing needs. Verify that the maximum drain-source voltage rating of 10.6V aligns with individual supercapacitor limits.

Special Purpose Part Context

This component belongs to the SAB MOSFET family designed specifically for supercapacitor management. It addresses the common issue of voltage imbalance caused by leakage current variations in series stacks. The device integrates precision analog characteristics into a standard SOIC-8 package, simplifying design implementation for energy storage systems.

Special Purpose Replacement Considerations

The ALD810022SAL serves as a functional substitute for balancing up to four supercapacitors instead of two. Both devices share identical core balancing technologies and electrical characteristics within their respective channel counts. Ensure pin compatibility and thermal ratings match the target PCB layout when substituting.

Special Purpose FAQ

How does the ALD910022SAL determine the balancing current?

The device uses its precision gate threshold voltage characteristic. When connected across a supercapacitor, the input voltage determines the output current exponentially, automatically adjusting the bypass current to maintain voltage balance.

What is the significance of the 2.20V gate threshold voltage?

At 2.20V input, the device conducts exactly 1µA. This specific point allows designers to set the maximum desired leakage current limit for the supercapacitor stack based on the capacitor's voltage rating.

Can this device be used for parallel supercapacitor balancing?

Yes, the datasheet indicates it can balance series and/or parallel-connected supercapacitors, though its primary design focus is managing voltage disparities in series stacks.