MCP73842 - Uncategorized Microchip - Free user manual and instructions
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| Product Type | Lithium-Ion Battery Charger Controller |
| Model | MCP73842 |
| Manufacturer | Microchip Technology |
| Package Type | SOIC-8, MSOP-8, or DFN-8 (depending on variant) |
| Dimensions (typical) | 5.0 mm x 4.0 mm x 1.75 mm (SOIC-8) |
| Weight (typical) | 0.08 g |
| Input Voltage Range | 4.5 V to 12 V |
| Output Voltage | Programmable up to 8.4 V (2-cell Li-Ion) |
| Charge Current | Programmable up to 1 A |
| Supported Battery Chemistries | Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Po) |
| Number of Cells | 1 or 2 (selectable) |
| Charge Modes | Constant-Current (CC), Constant-Voltage (CV) |
| Protection Features | Overvoltage, Overcurrent, Thermal Shutdown, Reverse Battery Protection |
| Status Indication | Open-drain charge status output |
| Operating Temperature Range | -40°C to +85°C |
| Power Supply | External DC power source (4.5–12 V) |
| Maintenance | None required; no moving parts |
| Safety Certifications | RoHS compliant, lead-free |
| Spare Parts / Repairability | Not applicable (integrated circuit) |
| General Information | Stand-alone linear charger controller; datasheet available from Microchip |
Frequently Asked Questions - MCP73842 Microchip
What is the MCP73842 used for?
The MCP73842 is a stand-alone linear charge management controller designed for 1- or 2-cell Lithium-Ion or Lithium-Polymer batteries. It manages the charging process with constant-current/constant-voltage (CC/CV) profiles.
What is the input voltage range for the MCP73842?
The recommended input voltage range is 4.5 V to 12 V. It can operate from a USB port or an external DC adapter.
How do I set the charge current?
The charge current is programmed by an external resistor (R_PROG) connected between the PROG pin and ground. Use the formula I_CHARGE = 1000V / R_PROG (where I_CHARGE in mA, R_PROG in kΩ) for currents up to 1 A.
Can the MCP73842 charge 2 cells in series?
Yes, the MCP73842 supports both 1-cell and 2-cell configurations. The cell count is selected via the CELL pin, which sets the regulation voltage to 4.2 V (1 cell) or 8.4 V (2 cells).
Does the MCP73842 include overcharge protection?
Yes, it features built-in overvoltage protection. When the battery voltage reaches the regulation threshold, the charger automatically transitions to constant-voltage mode and eventually terminates charging.
What is the operating temperature range?
The MCP73842 is specified for operation from -40°C to +85°C, making it suitable for a wide range of environments.
Is thermal shutdown included?
Yes, the device has thermal shutdown protection. If the junction temperature exceeds approximately 125°C, the charger is disabled until it cools down.
What indicates the charge status?
The STAT pin is an open-drain output that can be connected to an LED or microcontroller to indicate charge status: on during charging, off when charging is complete, and blinking for faults.
Can I use the MCP73842 with a USB power source?
Yes, as long as the USB supply provides 4.5 V to 5.5 V and sufficient current (at least the programmed charge current plus overhead). It is compliant with USB battery charging requirements.
Where can I find the complete datasheet and application notes?
The official datasheet and application notes are available on the Microchip website (www.microchip.com). Search for MCP73842 to download the manual reference design.
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USER MANUAL MCP73842 Microchip
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Product information
Brand : Microchip
Model : MCP73842
Category : Uncategorized