The MP2637A from Monolithic Power Systems is a highly-integrated, flexible, switch-mode battery charger with system power path management designed for single-cell Li-ion or Li-polymer batteries for use in a wide range of applications.
The MP2637A can operate in both charge mode and boost mode to allow for full system and battery power management.
When the input power is present, the MP2637A operates in charge mode. The MP2637A detects the battery voltage automatically and charges the battery in three phases: trickle current, constant current, and constant voltage. Other features include charge termination and auto-recharge.
The MP2637A also integrates both input current limit and input voltage regulation to manage the input power and meet the system power demand priority.
In the absence of an input source, the MP2637A switches to boost mode through MODE to power the SYS pins from the battery. The OLIM pin programs the output current limit in boost mode.
The MP2637A also allows for output short-circuit protection (SCP) to disconnect the battery completely from the load in the event of a short-circuit fault.
Normal operation resumes once the short-circuit fault is removed. The MP2637A provides full operating status indication to distinguish charge mode from boost mode.
To guarantee safe operation, the MP2637A limits the die temperature to a preset value of 120°C. Other safety features include input over-voltage protection (OVP), battery over-voltage protection (OVP), thermal shutdown, battery temperature monitoring, and a programmable timer to prevent prolonged charging of a dead battery.
A summary of features includes:
- Up to 16V Sustainable Input Voltage
- 5V to 6V Operating Input Voltage Range
- Power Management Function, Integrated Input Current Limit, Input Voltage Regulation
- Up to 2.5A Programmable Charge Current
- Trickle-Charge Function
- Selectable 4.20V/4.055V Charge Voltage with 0.5% Accuracy
- Negative Temperature Coefficient Pin (NTC) for Battery Temperature Monitoring
- Programmable Timer Back-Up Protection
- Thermal Regulation and Thermal Shutdown
- Internal Battery Reverse Leakage Blocking
- Integrated Over-Voltage Protection (OVP) and Over-Current Protection (OCP) for Pass-Through Path
- Reverse Boost Operation Mode for System Power
- Up to 2.4A Programmable Output Current Limit for Boost Mode
- Integrated Short-Circuit Protection (SCP) and Output Over-Voltage Protection (OVP) for Boost Mode
- Available in a QFN-24 (4mmx4mm) Package