ALD910018SAL

Special Purpose Overview

The ALD910018SAL is a dual-channel N-Channel Supercapacitor Auto Balancing (SAB) MOSFET array manufactured by Advanced Linear Devices, Inc. It utilizes EPAD technology to address voltage and leakage-current balancing for supercapacitors connected in series. The device operates within a Drain-Source Breakdown Voltage of 10.6V and supports an Operating Current up to 80mA. It is housed in an 8-SOIC surface-mount package with a commercial operating temperature range of 0°C to +70°C.

Special Purpose Feature Summary

• Precision factory-trimmed gate threshold voltage enables automatic regulation and balancing of leakage currents across series-connected supercapacitors.
• Exponential output current characteristic allows effective charge-balancing while minimizing additional leakage currents and power dissipation.
• Built with production-proven EPAD technology designed to prevent over-voltages in stacked supercapacitor configurations.

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 'L' indicates lead-free RoHS compliance as defined in the ordering information. Confirm the operating temperature range matches the application requirements, noting that the SAL suffix corresponds to the commercial range of 0°C to +70°C. Cross-reference the datasheet version and manufacturer documentation to ensure alignment with current product specifications.

Special Purpose Selection Notes

Select this component for applications requiring passive balancing of two series-connected supercapacitors without external control circuitry. Consider the exponential current response relative to input voltage when determining suitability for specific energy storage stacks. Ensure the maximum drain-source voltage rating aligns with the system's peak voltage limits.

Special Purpose Part Context

This part belongs to the ALD9100xx family of dual SAB MOSFET arrays, distinct from the quad-channel ALD8100xx series. Both families share similar operational principles but differ in channel count and specific precision electrical characteristics tailored for different stack sizes.

Special Purpose Replacement Considerations

The ALD910018SALI serves as the industrial temperature variant (-40°C to +85°C). Verify functional equivalence before substitution, noting that ordering suffixes may denote environmental ratings rather than electrical differences.

Special Purpose FAQ

How does the ALD910018SAL balance supercapacitor voltages?

It acts as a voltage-dependent variable resistor connected across each supercapacitor. As the voltage across a capacitor rises, the device's on-resistance decreases exponentially, shunting excess current to balance the voltage with other cells in the stack.

What is the typical gate threshold voltage for this device?

The typical gate threshold voltage (Vt) is 1.80V, measured at VGS = VDS with an IDS(ON) of 1µA.

Does the device consume significant power when supercapacitor voltage is low?

No. When the input voltage is below approximately 1.60V, the output current drops significantly (e.g., to 0.01µA), resulting in essentially zero power dissipation.