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ALD810022 Datasheet(PDF) 2 Page - Advanced Linear Devices |
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ALD810022 Datasheet(HTML) 2 Page - Advanced Linear Devices |
2 / 6 page ALD810022/ALD910022 Advanced Linear Devices, Inc. 2 of 6 SCHEMATIC DIAGRAM OF A TYPICAL CONNECTION FOR A TWO-SUPERCAP STACK 1-8 DENOTES PACKAGE PIN NUMBERS C1-C2 DENOTES SUPERCAPACITORS M1 M2 2 3, 8 4 1, 5 6 7 ALD9100XX C1 C2 + + V+ ≤ +15.0V V1 IDS(ON) ≤ 80mA SCHEMATIC DIAGRAM OF A TYPICAL CONNECTION FOR A FOUR-SUPERCAP STACK 1-16 DENOTES PACKAGE PIN NUMBERS C1-C4 DENOTES SUPERCAPACITORS V+ ≤ +15.0V 1, 5, 8, 16 2, 12 3 4 6 7 9 10 11 13 14 15 ALD8100XX C4 + + C3 + C2 + C1 M1 M2 M3 M4 V1 V2 V3 IDS(ON) ≤ 80mA GENERAL DESCRIPTION (CONT.) The voltage dependent characteristic of the ALD810022/ ALD910022 on-resistance is effective in controlling excessive volt- age rise across a supercapacitor when connected across it. In se- ries-connected supercapacitor stacks, when one supercapacitor voltage rises, the voltage of the other supercapacitors drops, with the ones that have the highest leakage currents having the lowest supercapacitor voltages. The SAB MOSFETs connected across these supercapacitors would exhibit complementary opposing cur- rent levels, resulting in little additional leakage currents other than those caused by the supercapacitors themselves. For technical assistance, please contact ALD technical support at techsupport@aldinc.com. APPLYING THE ALD810022/ALD910022: 1) Select a maximum supercapacitor leakage current limit for any supercapacitor used in the stack. This is the same as output cur- rent, IOUT = IDS(ON), of the ALD810022/ALD910022. Test that each supercapacitor leakage current meets this maximum current limit before use in the stack. 2) Determine whether the input voltage VIN (VGS = VDS) at that IOUT is acceptable for the intended application. This voltage is the same voltage as the maximum desired operating voltage of the supercapacitor. For example, with the ALD810022, IOUT = 1000µA corresponds to VIN = 2.72V. 3) Determine that the operating voltage margin, due to various tolerances and/or temperature effects, is adequate for the intended operating environment of the supercapacitor. |
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