Описание
The MCP73838 device is 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 MCP73838 ideally suitable for portable applications. The MCP73838 automatically selects the USB-Port or AC-Adapter as the power source for the system. For the USB-Port powered systems, the MCP73838 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 MCP73838 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 MCP73838 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 MCP73838 are fully specified over the ambient temperature range of -40°C to +85°C. The MCP73838 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 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 x 3 mm DFN
- 10-Lead MSOP
