MCP73837/8 Advanced Stand-Alone Li-Ion/Li-Polymer Battery Charge Management Controller with Autonomous AC Adapter or USB Port Source Selection Features Applications Highly Accurate Preset Voltage Regulation: Smart Phones and Personal Data Assistants 0.5% (PDA) Available Voltage Regulation Options: Portable Media Players (PMP) - 4.20V, 4.35V, 4.4V or 4.5V Ultra Mobile Devices (UMD) Complete Linear Charge Management Controller: Digital Cameras - Autonomous Power Source Selection MP3 Players - Integrated Pass Transistors Bluetooth Headsets - Integrated Current Sense Handheld Medical Devices - Integrated Reverse Discharge Protection AC/USB Dual Source Li-Ion Battery Chargers Constant Current (CC)/Constant Voltage (CV) Description Operation with Thermal Regulation The MCP73837 and MCP73838 devices are fully Selectable USB Port Charge Current: integrated linear Li-Ion/Li-Polymer battery chargers - Low: 1 Unit Load with autonomous power source selection. Along with its - High: 5 Unit Loads small physical size, the low number of external Programmable AC Adapter Charge Current: components required makes the MCP73837/8 ideally - 15 mA 1000 mA suitable for portable applications. Two-Charge Status Outputs The MCP73837/8 automatically selects the USB port or Power-Good Monitor: MCP73837 AC adapter as the power source for the system. For the Timer Enable: MCP73838 USB port powered systems, the MCP73837/8 Automatic Recharge: specifically adheres to the current limits governed by the USB specification. The host microcontroller can - Selectable Voltage Threshold select from two preset maximum charge current rates Automatic End-of-Charge Control: of 100mA (low-power USB port) or 500mA - Selectable Charge Termination Current Ratio (high-power USB port). With an AC adapter providing - Selectable Safety Timer Period power to the system, an external resistor sets the mag- Preconditioning of Deeply Depleted Cells Can nitude of the system or charge current up to a Be Disabled maximum of 1A. Battery Cell Temperature Monitor The MCP73837/8 employs a constant current/constant UVLO (Undervoltage Lockout) voltage charge algorithm with selectable Automatic Power-Down When Input Power Is preconditioning and charge termination. The constant Removed voltage regulation is fixed with four available options: 4.20V, 4.35V, 4.40V or 4.50V, to accommodate the new Low-Dropout (LDO) Linear Regulator Mode emerging battery charging requirements. The Numerous Selectable Options Available for a MCP73837/8 limits the charge current, based on die Variety of Applications: temperature, during high power or high ambient - Refer to Section 1.0 Electrical Characteris- conditions. This thermal regulation optimizes the tics for Selectable Options charge cycle time while maintaining the reliability of the - Refer to the Product Identification System device . for Standard Options The MCP73837/8 are fully specified over the ambient Temperature Range: -40C to 85C temperature range of -40C to +85C. Packaging: The MCP73837/8 devices are available in either a - 10-Lead 3 mm x 3 mm DFN 3mmx3mm 10-lead DFN package or a 10-lead - 10-Lead MSOP* MSOP package. * Consult the factory for MSOP availability. 2007-2015 Microchip Technology Inc. DS20002071C-page 1MCP73837/8 Package Types MCP73837/8 MCP73837/8 3x3 10-Lead DFN* 10-Lead MSOP V V V V 1 110 10 AC BAT BAT AC V V 2 9 THERM 2 9 USB THERM USB EP STAT1 3 8 PG (TE) 3 8 STAT1 PG (TE) 11 STAT2 4 7 PROG2 STAT2 4 7 PROG2 V V 5 6 PROG1 56 SS PROG1 SS *Includes Exposed Thermal Pad (EP) see Table 3-1. Typical Applications MCP73837 Typical Application 1 10 AC/DC Adapter V V AC BAT Thermistor 4.7 F Single 9 2 Li-Ion USB Port V THERM USB Cell 4.7 F 1k 4.7 F 3 5 V STAT1 SS 1k 4 7 STAT2 PROG2 Hi Low 1k 8 6 PG PROG1 R PROG MCP73838 Typical Application 1 10 AC/DC Adapter V V AC BAT Thermistor 4.7 F 9 2 USB Port V THERM USB Cell 4.7 F 1 K 4.7 F 3 8 STAT1 TE Hi Low 1 K 4 7 STAT2 PROG2 Hi Low 5 6 V PROG1 SS R PROG DS20002071C-page 2 2007-2015 Microchip Technology Inc.