ALD910021SALI

Special Purpose Overview

The ALD910021SALI is a dual-channel Supercapacitor Auto Balancing (SAB) MOSFET array manufactured by Advanced Linear Devices. It utilizes EPAD technology to balance voltage and leakage current in series-connected supercapacitors. The device features a precision gate threshold voltage of 2.10V at an output current of 1µA, with drain-source breakdown voltage rated at 10.6V. It operates within a temperature range of -40°C to +85°C and is housed in an 8-pin SOIC package.

Special Purpose Feature Summary

• Automatically regulates and balances leakage currents across series-connected supercapacitors
• Precision factory trimmed gate threshold voltage for accurate balancing
• Exponential relationship between input voltage and output current for effective variable resistance
• Near zero additional leakage currents when connected across supercapacitors

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 ordering suffix 'I' confirms the industrial temperature range (-40°C to +85°C). Confirm the 'L' suffix indicates lead-free compliance. Ensure the 8-pin SOIC package matches the design requirements. Check for ESD sensitivity precautions during handling.

Special Purpose Selection Notes

Select this component for applications requiring automatic balancing of up to two series-connected supercapacitors. Consider the exponential current-voltage characteristic for precise control. Verify that the maximum operating voltage and power dissipation limits suit the system environment.

Special Purpose Part Context

This part belongs to the ALD9100xx family of SAB MOSFETs designed for supercapacitor balancing. It complements the quad-channel ALD810021 variant. Both utilize production-proven EPAD technology to address voltage and leakage-current balancing challenges in series capacitor stacks.

Special Purpose Replacement Considerations

ALD910021SAL is the commercial temperature version of this component.

Special Purpose FAQ

How does the ALD910021SALI achieve supercapacitor balancing?

It acts as an effective variable resistor connected across each supercapacitor. The resistance varies exponentially with the input voltage, automatically regulating leakage currents to prevent over-voltages.

What is the significance of the 2.10V gate threshold voltage?

At 2.10V input, the device conducts exactly 1µA. This reference point allows for predictable current scaling; for instance, a 100mV increase significantly raises the output current, enabling precise balancing control.