MCP73811 - Uncategorized Microchip - Free user manual and instructions
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| Product Type | Battery Charge Management Controller |
| Supported Battery Chemistry | Single-Cell Li-Ion / Li-Polymer |
| Package Type | SOT-23-5 |
| Dimensions (typical) | 3.02 mm x 1.74 mm x 1.30 mm |
| Weight | < 0.1 g |
| Input Voltage Range | 3.75 V to 6.0 V |
| Charge Current (programmable) | Up to 500 mA (set by external resistor) |
| Charge Regulation Voltage | 4.2 V ±1% |
| Charge Algorithm | Constant-Current / Constant-Voltage (CC/CV) with preconditioning |
| Automatic Charge Termination | Yes (minimum current detection) |
| Charge Status Output | Open-drain active-low output (STAT) |
| Thermal Regulation | Reduces charge current to limit die temperature to 125°C |
| Safety Features | Overcharge protection, thermal shutdown, reverse battery protection |
| Operating Temperature Range | -40°C to +85°C |
| Quiescent Current (standby) | 0.5 µA typical |
| Maintenance | No maintenance required; it is a solid-state component |
| Spare Parts / Repairability | Not applicable; the device is a non-repairable integrated circuit |
| General Information | Designed for single-cell Li-Ion/Li-Polymer battery charging in space-limited applications |
Frequently Asked Questions - MCP73811 Microchip
What is the MCP73811 used for?
The MCP73811 is a linear charge management controller designed for single-cell Li-Ion/Li-Polymer batteries. It provides constant-current/constant-voltage charging with thermal regulation.
What is the maximum charge current of the MCP73811?
The maximum charge current is 500 mA, set by an external resistor connected to the PROG pin.
Does the MCP73811 have automatic charge termination?
Yes, it automatically terminates charging when the current falls below a threshold (typically 10% of the programmed current), indicating a fully charged battery.
What is the input voltage range for the MCP73811?
The input voltage range is 3.75 V to 6.0 V. A 5V USB supply or similar is typically used.
How does the MCP73811 protect the battery?
It includes overcharge protection (output voltage limited to 4.2V), thermal shutdown, and reverse battery protection. It also features a thermal regulation loop that reduces charge current to prevent overheating.
Can I charge a Li-Polymer battery with the MCP73811?
Yes, the MCP73811 is suitable for both Li-Ion and Li-Polymer single-cell batteries.
What is the package of the MCP73811?
It comes in a SOT-23-5 package, which is very small and suitable for compact designs.
How do I set the charge current?
The charge current is set by connecting a resistor (R_PROG) from the PROG pin to ground. The formula is I_CHARGE = 1000V / R_PROG (approximately). For example, 2kΩ gives 500mA.
What is the standby power consumption?
In standby mode (no battery or charge complete), the quiescent current is typically 0.5 µA, making it ideal for battery-powered applications.
Is the MCP73811 a linear charger?
Yes, it is a linear (LDO) charger, which means it is simple and low-noise but may generate heat at higher currents.
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USER MANUAL MCP73811 Microchip
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Product information
Brand : Microchip
Model : MCP73811
Category : Uncategorized