ALD810017SCLI

Overview

The ALD810017SCLI is a quad Supercapacitor Auto Balancing (SAB™) MOSFET array designed for voltage and leakage-current balancing of series-connected supercapacitors. It operates within an industrial temperature range of -40°C to +85°C and utilizes a 16-pin SOIC package with an exposed pad. The device features four N-channel MOSFETs with a precision gate threshold voltage of 1.70V at 1µA drain-source current. Maximum ratings include a V+ to V- voltage of 15.0V, a Drain-Source breakdown voltage of 10.6V, and an operating current limit of 80mA.

Feature Summary

• Precision factory-trimmed gate threshold voltage enables automatic regulation and balancing of leakage currents across supercapacitor stacks.
• Exponential output current characteristic provides effective variable resistance that balances cell voltages without additional external components.
• Near-zero power dissipation occurs when input voltage falls below the rated threshold, minimizing heat generation in low-voltage states.
• Integrated EPAD® technology supports scalable balancing for larger supercapacitor arrays and series/parallel configurations.

Applications

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

Procurement Notes

Verify the specific 'I' suffix indicates the industrial temperature grade (-40°C to +85°C) rather than the commercial variant. Confirm RoHS compliance status as the 'L' suffix denotes lead-free construction. Ensure ESD protection procedures are implemented during handling due to device sensitivity. Cross-reference pinout requirements against the 16-SOIC schematic diagram before finalizing board layout.

Selection Notes

Select this component when balancing up to four supercapacitors in series using a single integrated circuit solution. The fixed 1.70V threshold voltage suits applications where precise voltage limiting is required without external trimming. Consider the exponential current response for efficient passive balancing compared to active resistor networks. Evaluate the 16-pin package constraints against available PCB real estate for dense designs.

Part Context

This part belongs to the ALD8100xx family of SAB™ MOSFET arrays manufactured by Advanced Linear Devices Inc. It serves as the industrial-grade version of the ALD810017SCL, distinguished primarily by its extended operating temperature range. The device integrates specialized MOSFET architecture optimized for ultracapacitor management rather than general-purpose switching.

Replacement Considerations

The ALD810017SCL is the commercial-grade equivalent offering identical electrical characteristics but limited to a 0°C to +70°C operating range. Verify thermal requirements before substituting; the SCLI variant is necessary for environments below 0°C.

FAQ

How does the ALD810017SCLI balance supercapacitor voltages?

It acts as a voltage-dependent variable resistor. As the voltage across a connected supercapacitor rises above the 1.70V threshold, the internal MOSFET conducts exponentially more current, shunting excess charge to equalize voltage across the stack.

What is the maximum supply voltage for this device?

The absolute maximum rating for the V+ to V- voltage is 15.0V. The Drain-Source breakdown voltage is specified at 10.6V.

Does the device consume significant power when balancing is not needed?

No. When the input voltage is approximately 0.3V below the rated threshold (e.g., below 1.40V), the output current drops to negligible levels (0.001 µA or less), resulting in near-zero power dissipation.