ALD910019SALI

Special Purpose Overview

The ALD910019SALI is a dual-channel N-Channel Supercapacitor Auto Balancing (SAB™) MOSFET array manufactured by Advanced Linear Devices, Inc. It utilizes EPAD® technology to balance voltage and leakage current in series-connected supercapacitors. The device operates within an industrial temperature range of -40°C to +85°C and features a precision gate threshold voltage (Vt) of 1.90V at IDS(ON) = 1µA. Key electrical parameters include a Drain-Source Breakdown Voltage (BVDSX) of 10.6V, maximum operating current of 80mA, and power dissipation of 500mW. It is housed in an 8-pin SOIC package.

Special Purpose Feature Summary

• Precision factory-trimmed gate threshold voltage for accurate balancing
• Exponential output current response to input voltage changes
• Near-zero additional leakage currents below rated voltages
• Always active with fast response time for continuous regulation

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 'I' suffix confirms the industrial temperature range (-40°C to +85°C). Confirm the 'L' suffix indicates lead-free (RoHS) compliance. Ensure the SALI designation matches the required 8-pin SOIC package configuration for your specific PCB layout requirements.

Special Purpose Selection Notes

Select this component when balancing two series-connected supercapacitors requiring precise voltage regulation. The dual-channel architecture simplifies circuit design compared to discrete solutions. Consider the exponential current-voltage characteristic for applications demanding minimal power dissipation at lower voltages.

Special Purpose Part Context

This part belongs to the ALD9100xx family of SAB™ MOSFETs, designed specifically for supercapacitor balancing. It complements the quad-channel ALD810019 variant. The family addresses over-voltage protection and leakage-current balancing challenges inherent in series-connected energy storage stacks.

Special Purpose Replacement Considerations

ALD910019SAL (Commercial temperature range)

Special Purpose FAQ

How does the ALD910019SALI handle voltage imbalance?

It acts as a variable resistor connected across each supercapacitor. As voltage rises, on-resistance decreases exponentially, shunting excess current to balance the stack.

What is the significance of the 1.90V threshold voltage?

At VIN = 1.90V, the output current is precisely 1µA. This reference point allows designers to set the maximum operating voltage for the supercapacitors.

Does the device consume significant power at low voltages?

No. When VIN is below 1.70V, the output current drops significantly (e.g., 0.01µA at 1.50V), resulting in near-zero power dissipation.