MCP73871 Stand-Alone System Load Sharing and Li-Ion/Li-Polymer Battery Charge Management Controller Features Applications Integrated System Load Sharing and Battery GPSs/Navigators Charge Management PDAs and Smart Phones - Simultaneously Power the System and Portable Media Players and MP3 Players Charge the Li-Ion Battery Digital Cameras - Voltage Proportional Current Control (VPCC) Bluetooth Headsets ensures system load has priority over Li-Ion Portable Medical Devices battery charge current Charge Cradles/Docking Stations - Low-Loss Power-Path Management with Toys Ideal Diode Operation Complete Linear Charge Management Controller Description - Integrated Pass Transistors The MCP73871 device is a fully integrated linear - Integrated Current Sense solution for system load sharing and Li-Ion/Li-Polymer - Integrated Reverse Discharge Protection battery charge management with AC-DC wall adapter - Selectable Input Power Sources: USB Port or and USB port power sources selection. It is also AC-DC Wall Adapter capable of autonomous power source selection between input and battery. Along with its small physical Preset High Accuracy Charge Voltage Options: size, the low number of required external components - 4.10V, 4.20V, 4.35V or 4.40V makes the device ideally suited for portable - 0.5% Regulation Tolerance applications. Constant Current/Constant Voltage (CC/CV) The MCP73871 device automatically obtains power for Operation with Thermal Regulation the system load from a single-cell Li-Ion battery or an Maximum 1.8A Total Input Current Control input power source (AC-DC wall adapter or USB port). Resistor Programmable Fast Charge Current The MCP73871 device specifically adheres to the Control: 50 mA to 1A current drawn limits governed by the USB specification. Resistor Programmable Termination Set Point With an AC-DC wall adapter providing power to the Selectable USB Input Current Control system, an external resistor sets the magnitude of 1A maximum charge current while supporting up to 1.8A - Absolute Maximum: 100 mA (L)/500 mA (H) total current for system load and battery charge Automatic Recharge current. Automatic End-of-Charge Control The MCP73871 device employs a constant Safety Timer With Timer Enable/Disable Control current/constant voltage (CC/CV) charge algorithm 0.1C Preconditioning for Deeply Depleted Cells with selectable charge termination point. To Battery Cell Temperature Monitor accommodate new and emerging battery charging Undervoltage Lockout (UVLO) requirements, the constant voltage regulation is fixed with four available options: 4.10V, 4.20V, 4.35V or Low Battery Status Indicator (LBO) 4.40V. The MCP73871 device also limits the charge Power Good Status Indicator (PG) current based on the die temperature during high Charge Status and Fault Condition Indicators power or high ambient conditions. This thermal Numerous Selectable Options Available for a regulation optimizes the charge cycle time while Variety of Applications: maintaining device reliability. - Refer to Section 1.0 Electrical The MCP73871 device includes a low battery indicator, Characteristics for Selectable Options a power good indicator and two charge status - Refer to the Product Identification System indicators that allow for outputs with LEDs or for Standard Options communication with host microcontrollers. The Temperature Range: -40C to +85C MCP73871 device is fully specified over the ambient Packaging: 20-Lead QFN (4 mm x 4 mm) temperature range of -40C to +85C. 2008-2019 Microchip Technology Inc. DS20002090E-page 1MCP73871 Package Types MCP73871 20-Lead QFN* 20 19 18 17 16 OUT 1 V 15 BAT VPCC 2 V 14 BAT EP SEL 3 13 PROG1 21 4 PROG2 12 PROG3 THERM 5 V 11 SS 67 8 10 9 * Includes Exposed Thermal Pad (EP) see Table 3-1. Typical Application Circuit MCP73871 Typical Application AC-DC Adapter or USB Port 18, 19 1, 20 System IN OUT Load 10 F 4.7 F 2 VPCC 14, 15, 16 V BAT 470 6 4.7 F PG NTC 470 THERM 5 7 STAT2 10 k 470 8 Single-Cell STAT1 PROG1 R PROG1 Li-Ion Battery 13 LBO 3 SEL Hi Low R 4 12 PROG3 PROG3 PROG2 Hi Low 9 TE Hi Low 17 V 10, 11, EP SS CE Hi Low DS20002090E-page 2 2008-2019 Microchip Technology Inc. PG OUT STAT2 IN STAT1/LBO IN TE CE V V SS BAT SENSE