MCP73812T-420I/OT

The MCP73811/2 devices are linear charge management controllers that are designed for use in space limited and cost sensitive applications. The MCP73811/2 provide specific charge algorithms for single cell Li-Ion or Li-Polymer battery to achieve optimal capacity in the shortest charging time possible. Along with its small physical size, the low number of external components required make the MCP73811/2 ideally suited for portable applications. For applications charging from a USB port, the MCP73811 adheres to all the specifications governing the USB power bus. The MCP73811/2 employ a constant current/constant voltage charge algorithm. The constant voltage regulation is fixed at 4.20V, with a tight regulation tolerance of 1%. For the MCP73811, the constant current value is selected as 85 mA (low power USB port) or 450 mA (high power USB port) with a digital input signal on the PROG input. For the MCP73812, the constant current value is set with one external resistor. The MCP73811/2 limit the charge current based on die temperature during high power or high ambient conditions. This thermal regulation optimizes the charge cycle time while maintaining device reliability. The MCP73811/2 are fully specified over the ambient temperature range of -40°C to +85°C. The MCP73811/2 are available in a 5-Lead, SOT-23 package.

Applications

• Low-Cost Lithium-Ion/Lithium-Polymer Battery Chargers
• Rechargeable Toys
• Electronic Cigarettes
• Bluetooth Headsets
• USB Chargers

Key features

• Complete Linear Charge Management Controller
• Integrated Pass Transistor - Integrated Current Sense - Integrated Reverse Discharge Protection
• Constant Current / Constant Voltage Operation with Thermal Regulation
• High Accuracy Preset Voltage Regulation: + 1%
• Voltage Regulation: 4.20V
• Selectable Charge Current: MCP73811: 85 mA / 450 mA
• Programmable Charge Current: MCP73812: 50 mA - 500 mA
• Minimum External Components Required: MCP73811: 2 Ceramic Capacitors - MCP73812: 2 Ceramic Capacitors and 1 Resistor
• No Preconditioning
• External End-of-Charge Control
• Automatic Power-Down when Input Power Removed
• Active High Charge Enable
• Temperature Range: -40°C to +85°C
• Packaging: 5-Lead SOT-23