ALD910020SALI

Special Purpose Overview

The ALD910020SALI is a dual-channel Supercapacitor Auto Balancing (SAB™) MOSFET array manufactured by Advanced Linear Devices Inc. It utilizes production-proven eEPAD® technology to address voltage and leakage-current balancing for supercapacitors connected in series. The device features precision factory-trimmed gate threshold voltages, with a typical value of 2.00V at an output current of 1µA. It operates within a supply voltage range up to 15.0V and supports drain-source breakdown voltages of 10.6V. The component is housed in an 8-pin SOIC package and is rated for industrial operating temperatures ranging from -40°C to +85°C.

Special Purpose Feature Summary

• Precision factory trimmed gate threshold voltage ensures accurate automatic regulation and balancing of leakage currents across series-connected supercapacitors.
• Exponential relationship between input voltage and output current allows the device to act as a variable resistor that minimizes power dissipation when cell voltage is below the threshold.
• Near-zero additional leakage currents are generated, maintaining balance without introducing significant parasitic effects to the supercapacitor stack.
• Always active operation provides fast response time to prevent over-voltages across individual supercapacitor cells.

Special Purpose Applications

• Series-connected supercapacitor cell leakage balancing
• Energy harvesting systems requiring voltage stabilization
• Long term backup battery configurations with supercapacitor outputs

Special Purpose Procurement Notes

Verify the ordering suffix 'I' confirms the industrial temperature range specification (-40°C to +85°C). Confirm the 'L' suffix indicates lead-free compliance per RoHS standards. Ensure the package type matches the required 8-pin SOIC footprint for the specific PCB layout design constraints.

Special Purpose Selection Notes

Select this component for applications requiring the balancing of two series-connected supercapacitors. The dual-channel architecture simplifies circuit design compared to discrete solutions. Consider the exponential current characteristic for efficient power management in energy storage systems where minimizing standby leakage is critical.

Special Purpose Part Context

This part belongs to the ALD9100xx family of SAB™ MOSFETs, designed specifically for supercapacitor balancing. It complements the quad-channel ALD8100xx series, offering a compact solution for lower-cell-count stacks. The technology leverages CMOS analog integration to replace complex external balancing circuits.

Special Purpose Replacement Considerations

ALD910020SAL serves as the commercial grade equivalent with a 0°C to +70°C operating range.

Special Purpose FAQ

How does the ALD910020SALI handle supercapacitor voltage imbalance?

It automatically regulates leakage currents by acting as a voltage-dependent resistor. As the voltage across a supercapacitor rises, the device's on-resistance decreases exponentially, shunting excess current to balance the stack.

What is the significance of the 2.00V gate threshold voltage?

The 2.00V threshold (at 1µA) defines the reference voltage for balancing. When the supercapacitor voltage reaches this level, the device begins conducting significantly to prevent further voltage rise, ensuring each cell stays within safe limits.