MCP73837/8

• High Accuracy Preset Voltage Regulation: + 0.5%
• Available Voltage Regulation Options: - 4.20V, 4.35V, 4.4V, or 4.5V
• Complete Linear Charge Management Controller: - Autonomous Power Source Selection - Integrated Pass Transistors
- Integrated Current Sense - Integrated Reverse Discharge Protection
• Constant Current (CC) / Constant Voltage (CV) Operation with Thermal Regulation
• Selectable USB-Port Charge Current: - Low: 1 Unit Load / High: 5 Unit Loads
• Programmable AC-Adapter Charge Current: - 15 mA - 1000 mA
• Two Charge Status Outputs
• Power-Good Monitor: MCP73837
• Timer Enable: MCP73838
• Automatic Recharge: - Selectable Voltage Threshold
• Automatic End-of-Charge Control: - Selectable Charge Termination Current Ratio - Selectable Safety Timer Period
• Preconditioning of Deeply Depleted Cells - can be disabled
• Battery Cell Temperature Monitor
• UVLO (Undervoltage Lockout)
• Automatic Power-Down when Input Power is Removed
• Low-Dropout (LDO) Linear Regulator Mode
• Numerous Selectable Options Available for a Variety of Applications: - Refer to Section 1.0 "Electrical Characteristics" for Selectable Options" - Refer to the "Product Identification System" for Standard Options
• Temperature Range: -40°C to 85°C
• Packaging: - 10-Lead 3 mm x 3 mm DFN - 10-Lead MSOP*

VDDN ................................................................................7.0V
All Inputs and Outputs w.r.t. VSS ............... -0.3 to (VDD+0.3)V
Maximum Junction Temperature, TJ ............Internally Limited
Storage temperature .....................................-65°C to +150°C
ESD protection on all pins
Human Body Model (1.5 kW in Series with 100 pF) ...... 4 kV
Machine Model (200 pF, No Series Resistance) .............300V


† Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

The MCP73837 and MCP73838 devices are fully integrated linear Li-Ion / Li-Polymer battery chargers with autonomous power source selection. Along with its small physical size, the low number of external components required makes the MCP73837/8 ideally suitable for portable applications.

The MCP73837/8 automatically selects the USB-Port or AC-Adapter as the power source for the system. For the USB-Port powered systems, the MCP73837/8 specifically adheres to the current limits governed by the USB specification. The host microcontroller can select from two preset maximum charge current rates of 100 mA (low power USB-port) or 500 mA (high power USB-port). With an AC-Adapter providing power to the system, an external resistor sets the magnitude of the system or charge current up to a maximum of 1A. The MCP73837/8 employs a constant current /constant voltage charge algorithm with selectable preconditioning and charge termination. The constant voltage regulation is fixed with four available options: 4.20V, 4.35V, 4.40V, or 4.50V, to accommodated the new emerging battery charging requirements. The MCP73837/8 limits the charge current based on die temperature during high power or high ambient conditions. This thermal regulation optimizes the charge cycle time while maintaining the device reliability.

The MCP73837/8 are fully specified over the ambient temperature range of -40°C to +85°C. The MCP73837/8 devices are available in a 10-Lead, 3 mm x 3 mm, DFN package or in a 10-Lead MSOP package.