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SABMB910021 Datasheet(PDF) 2 Page - Advanced Linear Devices |
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SABMB910021 Datasheet(HTML) 2 Page - Advanced Linear Devices |
2 / 4 page SABMB16/SABMB810025/SABMB910025 Advanced Linear Devices, Inc. 2 of 4 SABMB8100XX/SABMB9100XX The ALD8100XX/ALD9100XX SAB MOSFET family offers the user a selection of different threshold voltages for various supercapacitor nominal voltage values and desired leakage balancing characteristics. Each SAB MOSFET generally requires connecting its V+ pin to the most positive voltage and its V- and IC pins to the most negative voltage within the package. Note that each Drain pin has an internal reverse biased diode to its Source pin, and each Gate pin has an internal reverse biased diode to V-. All other pins must have voltages within V+ and V- voltage limits within the same package unit. Standard ESD protection facilities and handling procedures for static sensitive devices must also be used while installing the ALD8100XX or ALD9100XX units. Once installed, the connection configuration will protect the ALD8100XX/ALD9100XX units from ESD damage. When connected to a supercapacitor stack, the ALD8100XX/ ALD9100XX is further protected from virtually any ESD damage due to the large capacitance of the supercapacitors, which sinks any ESD charge and thereby reduces any of the terminal voltages to minimal harmless values. SABMB16 PRINTED CIRCUIT BOARDS The SABMB16 Printed Circuit Board is supplied as a blank PCB board, made with RoHS compliant FR4 material, ready for mounting of up to two 8-lead ALD9100XX units or one 16-lead ALD8100XX unit. It is also supplied and available with a 6 digit suffix, which denotes the specific ALD9100XX or ALD8100XX component mounted and tested on the PCB. All that is required for the user to perform is mount the PCB and wire the appropriate connections from the SABMB16 board to the respective supercapacitor nodes. Each SABMB16 Printed Circuit Board has two 8-lead SOIC footprints for up to two ALD9100XX units. It also has a 16-lead SOIC footprint for an ALD8100XX which is parallel connected to the two ALD9100XX footprints (See schematic diagram). Each SABMB16 PCB has terminals labeled V+, A, B, C, D, E and V-. Each of these terminals has two wiring holes for easier connection of the same terminal node to two external connection points. V+ is directly connected to terminal A, which must be connected to the most positive voltage for the individual SABMB16 PCB board. V- is directly connected to terminal E, which must be connected to the most negative voltage present for the same SABMB16 board. All other terminals, namely B, C and D, must have voltages between V+ and V- for the board. When cascade or daisy-chain connected, each SABMB16 board is self-contained and rated for 15.0V maximum. When two supercapacitors are installed to be balanced by SAB MOSFETs, a single ALD9100XX unit can be mounted on either one of two 8-lead SOIC footprints on the SABMB16. The user then needs to connect the unused circuit traces to the appropriate terminals so that V+ and V- remain the most positive voltage and the most negative voltage for that SABMB16 board, respectively. For example, if only one ALD9100XX is used for the upper SOIC footprint, terminal C can be connected to terminal E, or V-. One convenient way to make this connection on board is to install R2 with a value equal to 0 Ω or use an external wire. Any number of SABMB16 boards can be daisy-chain connected in series. For example, three SABMB16 boards, each with an ALD810025SCLI installed, can be connected in series to a 30V power supply, provided care is taken to insure that each SABMB16 board V- is connected to the V+ of the next SABMB16 board in series, such that each board would not have internal voltages from V+ to V- exceeding 10V (30V/3 = 10V). The ALD8100XX/ALD9100XX is rated for reverse bias diode currents of up to 80 mA maximum for each SAB MOSFET on board. Any reverse bias condition as a result of changing supercapacitor voltages, especially during fast supercapacitor discharge, could lead to some internal nodes temporally reverse biased with surge current in excess of this limit. The SABMB16 board has additional optional TO277 footprints for mounting external schottky rectifiers (power diodes) to clamp such current transients. The user is advised to determine the various power and current limits, including temperature and heat dissipation considerations, when selecting a suitable component for such purpose. The appropriate level of derating and margin allowance must also be added to assure long term reliability of the PCB board. SUPERCAPACITORS Supercapacitors are typically rated with a nominal recommended working voltage established for long life at their maximum rated operating temperature. Excessive supercapacitor voltages that exceed its rated voltage for a prolonged time period will result in reduced operating life and eventual rupture and catastrophic failure. To prevent such an occurrence, a means of automatically adjusting (charge-balancing) and monitoring the maximum voltage is required in most applications having two or more supercapacitors connected in series, due to their different internal leakage currents that vary from one supercapacitor to another. The supercapacitor leakage current itself is a variable function of its many parameters such as aging, initial leakage current at zero input voltage, the material and the construction of the supercapacitor. Its leakage is also a function of the charging voltage, the charging current, operating temperature range and the rate of change of many of these parameters. Supercapacitor balancing must accommodate these changing conditions. ENERGY HARVESTING APPLICATIONS Supercapacitors offer an important benefit for energy harvesting applications from a low energy source, buffering and storing such energy to drive a higher power load. For energy harvesting applications, supercapacitor leakage currents are a critical factor, as the average energy harvesting input charge must exceed the average supercapacitor internal leakage currents in order for any net energy to be harvested and saved. Often, the input energy is variable, meaning that its input voltage and current magnitude are not constant and may be dependent upon a whole set of other parameters such as the source energy availability, energy sensor conversion efficiency, etc. SAB MOSFETs used for charge balancing, due to their high input threshold voltages, would be completely turned off, consuming zero drain current while the supercapacitor is being charged, SUPERCAPACITOR AUTO BALANCING PCB |
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