1304 Adafruit

MCP73831 Miniature Single Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controller Features: Description: Linear Charge Management Controller: The MCP73831 is a highly advanced linear charge management controller for use in space-limited, cost - Integrated Pass Transistor sensitive applications. The MCP73831 is available in - Integrated Current Sense an 8-Lead, 2 mm x 3 mm DFN package or a 5-Lead, - Reverse Discharge Protection SOT23 package. Along with its small physical size, the High Accuracy Preset Voltage Regulation: + 0.75% low number of external components required makes Four Voltage Regulation Options: the MCP73831 ideally suited for portable applications. - 4.20V, 4.35V, 4.40V, 4.50V For applications charging from a USB port, the MCP73831 adheres to all the specifications governing Programmable Charge Current the USB power bus. Selectable Preconditioning The MCP73831 employs a constant-current/constant- Selectable End-of-Charge Control voltage charge algorithm with selectable precondition- Charge Status Output ing and charge termination. The constant voltage regu- Automatic Power-Down lation is fixed with four available options: 4.20V, 4.35V, Thermal Regulation 4.40V, or 4.50V, to accommodate new, emerging bat- Temperature Range: -40C to +85C tery charging requirements. The constant current value is set with one external resistor. The MCP73831 limits Packaging: the charge current based on die temperature during - 8-Lead, 2 mm x 3 mm DFN high power or high ambient conditions. This thermal - 5-Lead, SOT23 regulation optimizes the charge cycle time while maintaining device reliability. Applications: Several options are available for the preconditioning Lithium-Ion/Lithium-Polymer Battery Chargers threshold, preconditioning current value, charge termi- nation value, and automatic recharge threshold. The Personal Data Assistants preconditioning value and charge termination value are Cellular Telephones set as a ratio, or percentage, of the programmed con- Digital Cameras stant current value. Preconditioning can be disabled. MP3 Players Refer to Section 1.0 Electrical Characteristics for Bluetooth Headsets available options and the Product Identification System for standard options. USB Chargers The MCP73831 is fully specified over the ambient Typical Application temperature range of -40C to +85C. 500 mA Li-Ion Battery Charger Package Types V IN 4 3 V V DD BAT + Single 4.7 F 8-Lead DFN 4.7 F Li-Ion - Cell (2 mm x 3 mm) SOT23-5 5 PROG V 8 PROG DD 1 STAT 1 5 PROG 470 2k V 2 7 2 NC V DD SS 1 2 V STAT SS V 3 4 V V 3 6 BAT DD BAT V SS MCP73831 V 4 5 STAT BAT 2005 Microchip Technology Inc. DS21984A-page 1MCP73831 Functional Block Diagram V DD 6 A DIRECTION CONTROL V BAT G=0.001 6 A 0.5 A PROG CA + REFERENCE - GENERATOR 43.6 k V (1.22V) 361 k 3.9 k REF + - 89 k PRECONDITION 182.3 k 111 k + 15 k STAT - TERMINATION + - 7k CHARGE VA + - 190 k 111 k + SHDN - 0.5 A DIRECTION + CONTROL - V BAT 477 k + UVLO - 255 k 100 k V SS DS21984A-page 2 2005 Microchip Technology Inc.