MICROCHIP MCP73838-NVI/UN

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 accommodate 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 reliability of the device. The MCP73837/8 are fully specified over the ambient temperature range of -40°C to +85°C. The MCP73837/8 devices are available in either a 3 mm×3 mm 10-lead DFN package or a 10-lead MSOP package.

• Highly Accurate 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
• Temperature Range: -40°C to 85°C
• Packaging: - 10-Lead 3 mm×3 mm DFN - 10-Lead MSOP

• 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