The MCP73831T-2ACI\/OT from Microchip Technology is a miniature single-cell Li-Ion\/Li-Polymer charge management controller in a 5-lead SOT-23 package. It features an integrated pass transistor, current sensing, and reverse discharge protection with a fixed 4.2 V regulation voltage and +\/-0.75% accuracy. The device supports programmable charge current up to 500 mA.<\/p>\n
| Regulation Voltage<\/td>\n | 4.2 V<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||||||||
| Voltage Accuracy<\/td>\n | +\/-0.75%<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||||||||
| Max Charge Current<\/td>\n | 500 mA (programmable)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||||||||
| \u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n | 3.75 V to 6 V<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||||||||
| Battery Type<\/td>\n | Single-cell Li-Ion\/Li-Polymer<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||||||||
| Charge Status Output<\/td>\n | Tri-state (drives LED directly)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||||||||
| Thermal Regulation<\/td>\n | Yes (on-chip)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||||||||
| \u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n | -40\u00b0C to 85\u00b0C<\/td>\n<\/tr>\n<\/table>\n\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\nProduct Overview The MCP73831T-2ACI\/OT from Microchip Technology is a miniature single-cell Li-Ion\/Li-Polymer charge management controller in a 5-lead SOT-23 package. It features an integrated pass transistor, current sensing, and reverse discharge protection with a fixed 4.2 V regulation voltage and +\/-0.75% accuracy. The device supports programmable charge current up to 500 mA. Key Specifications Regulation […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,29],"tags":[],"chip_brand":[134],"class_list":["post-3191","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-microchip"],"acf":{"brief_explanation":"500 mA single-cell Li-Ion charger, 4.2 V fixed, SOT-23-5, integrated pass transistor","date_code":"","package_case":"SOT-23-5 (3.10 x 1.80 x 1.45 mm)","in_stock":11200,"datasheet":"https:\/\/ww1.microchip.com\/downloads\/en\/DeviceDoc\/MCP73831-Family-Data-Sheet-DS20001984.pdf","price":"$0.58 @ 1ku","product_introduction":"The MCP73831T-2ACI\/OT is a miniature linear charge management controller from Microchip Technology, specifically designed for single-cell Li-Ion and Li-Polymer batteries in space-constrained applications. The -2ACI variant provides a fixed 4.2 V regulation voltage with +\/-0.75% accuracy, making it compatible with standard 4.2 V Li-Ion cells. The device integrates the pass transistor and current sensing element, requiring only two external components: a programming resistor for charge current and a decoupling capacitor. The charge current is programmable up to 500 mA via a single resistor on the PROG pin. A tri-state status output can directly drive an LED to indicate charge in progress, charge complete, or high-impedance state. On-chip thermal regulation automatically reduces the charge current when the junction temperature exceeds the thermal regulation threshold, preventing thermal runaway in high-power or high-ambient-temperature conditions.","working_principle":"The MCP73831T-2ACI\/OT operates through four charge phases: (1) The preconditioning phase applies a reduced current (typically 10% of the programmed value) when the battery voltage is below the preconditioning threshold, safely recovering deeply discharged cells. (2) The constant-current (CC) phase delivers the full programmed charge current set by the PROG resistor, during which the battery voltage rises steadily. (3) The constant-voltage (CV) phase maintains the output at 4.2 V with +\/-0.75% accuracy while the charge current tapers off as the cell approaches full charge. (4) The charge termination phase ends charging when the current drops below the end-of-charge ratio (selectable by the -A variant). The on-chip thermal regulation loop monitors junction temperature and reduces the charge current if the die exceeds approximately 115\u00b0C, ensuring safe operation under all conditions. Reverse discharge protection prevents battery drain back through the input when the input supply is removed.","pin_description":"
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