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Product Attributes

Introduction

ALD810016/ALD910016 are members of the ALD8100xx (quad-channel) and ALD9100xx (dual-channel) Supercapacitor Auto Balance MOSFET (SAB MOSFET) family. SAB MOSFETs are fabricated using production-proven EPAD technology and are designed to address voltage and leakage current balancing of series-connected supercapacitors. Supercapacitors, also known as ultracapacitors or electric double-layer capacitors, can achieve leakage current balancing in series connections and prevent overvoltage by connecting one or more devices across each supercapacitor cell.

Each SAB MOSFET has a precise gate threshold voltage in Vt mode, defined as 1.60V when the gate-drain-source terminals (VGS = VDS) are connected together and the drain-source current IDS(ON) = 1μA. Different input voltages VIN produce output current IOUT = IDS(ON) characteristics, forming an effective variable resistance whose value varies exponentially with VIN. When this VIN is connected across each series-connected supercapacitor, the voltage and current of each supercapacitor can be controlled within its rated limits.

The voltage-dependent on-resistance characteristics of the ALD810016/ALD910016 effectively control excessive voltage rise across supercapacitors. In a series-connected supercapacitor string, when the voltage of one supercapacitor rises, the voltages of the others decrease, with the supercapacitor exhibiting the highest leakage current having the lowest voltage. The SAB MOSFETs connected across these supercapacitors exhibit complementary inverse current levels, generating virtually no additional leakage current beyond that produced by the supercapacitors themselves.

Features

• Simple and cost-effective to use
• Factory-precision trimmed
• Automatic leakage current regulation and balancing
• Effective supercapacitor charge balancing
• Single IC package balances up to 4 supercapacitors
• Balances 2-cell, 3-cell, and 4-cell series-connected supercapacitors
• Scalable to larger supercapacitor banks and arrays
• Near-zero additional leakage current
• Zero leakage current at 0.3V below rated voltage
• Balances series and/or parallel connected supercapacitors
• Leakage current is an exponential function of cell voltage
• Active current range from < 0.3 nA to > 1000 μA
• Always active with fast response time
• Minimized leakage current and power consumption

Applications

• Series supercapacitor cell leakage current balancing
• Energy harvesting
• Long-term backup battery with supercapacitor output
• Zero-power voltage divider at selected voltage
• Matched current mirrors and current sources
• Zero-power mode maximum voltage limiter
• Scalable supercapacitor banks and arrays