ALD810018SCLI

Overview

The ALD810018SCLI is a quad Supercapacitor Auto Balancing (SAB) MOSFET array manufactured by Advanced Linear Devices. It integrates four N-channel enhancement-mode MOSFETs in a 16-pin SOIC package with an industrial temperature range of -40°C to +85°C. The device features a precision gate threshold voltage of 1.80V at 1µA drain-source current and a maximum drain-source breakdown voltage of 10.6V. It supports a continuous operating current of 80mA and a power dissipation of 500mW, designed for balancing up to four series-connected supercapacitors.

Feature Summary

• Integrates four SAB MOSFETs for simultaneous leakage-current balancing of multiple series-connected supercapacitors
• Features precision factory-trimmed gate threshold voltages that create an effective variable resistor exponentially dependent on input voltage
• Utilizes production-proven ePAD technology for enhanced thermal performance and reliability
• Provides near-zero additional leakage currents when connected across supercapacitor stacks

Applications

• Series-connected supercapacitor cell leakage balancing
• Energy harvesting systems
• Long-term backup battery configurations with supercapacitor outputs
• Zero-power voltage dividers at selected voltages
• Scaled supercapacitor stacks and arrays

Procurement Notes

Verify the specific ordering suffix 'L' indicates lead-free compliance and 'I' confirms the industrial temperature range (-40°C to +85°C). Confirm the 16-pin SOIC package type matches the design requirements. Ensure static control procedures are followed during handling due to ESD sensitivity. Cross-reference the datasheet version to ensure alignment with current specifications.

Selection Notes

Select this component for applications requiring automatic balancing of up to four series-connected supercapacitors within a single package. The industrial temperature rating makes it suitable for harsh environments. Consider the exponential current-voltage characteristic for precise balancing without external components. Verify that the 10.6V breakdown voltage aligns with the maximum cell voltage limits of the target supercapacitor stack.

Part Context

This part belongs to the ALD8100xx family of Supercapacitor Auto Balancing MOSFET arrays. It shares core functionality with the dual-channel ALD910018 but provides four independent balancing channels. The device is designed to address voltage and leakage-current balancing issues inherent in series-connected supercapacitor stacks, preventing over-voltages through passive, self-regulating mechanisms.

Replacement Considerations

ALD810018SCL: Commercial temperature grade variant (0°C to +70°C).

FAQ

How does the ALD810018SCLI balance supercapacitor voltages?

It acts as a voltage-dependent variable resistor. As the voltage across a supercapacitor increases, the MOSFET's output current increases exponentially, shunting excess charge and preventing over-voltage.

What is the significance of the 1.80V gate threshold voltage?

At 1.80V input, the device conducts 1µA. This reference point allows designers to predict the balancing current based on the supercapacitor's voltage, enabling precise configuration of the balancing circuit.

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 on series stacks.