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.

*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
*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
- 10-Lead 3 mm x 3 mm DFN
- 10-Lead MSOP*
*Consult Factory for MSOP Package Availability.

*Smart Phones and Personal Data Assistants (PDA)
*Portable Media Players(PMP)
*Ultra Mobile Devices(UMD)
*Digital Cameras
*MP3 Players
*Bluetooth Headsets
*Handheld Medical Devices
*AC/USB Dual Source Li-Ion Battery Chargers

MCP73838, MCP73837-FCI/UN, MCP73837-FJI/UN, MCP73837-NVI/UN,
MCP73837-FCI/MF, MCP73837-FJI/MF, MCP73837-NVI/MF, MCP73838-FCI/UN, MCP73838-FJI/UN, MCP73838-NVI/UN, MCP73838-FCI/MF, MCP73838-FJI/MF, MCP73838-NVI/MF

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