Reference Design for MP2690, All-in-one 2.5A Battery Charger with 2.1A Boost Current for Power Bank Applications
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The EV2690-R-00B is the reference design board for MP2690, a highly-integrated, flexible switch-mode battery charge management for a single-cell Li-ion and Li-Polymer battery used in a wide range of applications.
The demo board uses two operating modes—charge mode and boost mode—to allow management of system and battery power based on the state of the input.
When input power is present, the board charges a single-cell battery with a charge current of 2.5A.
In the absence of an input source, the board switches to boost mode through the PB pin to power the SYS pins from the battery with a current of up to 2.1A.
The evaluation board provides 4-LED drivers to achieve the voltage based fuel gauge indication and distinguish charge mode from boost mode.
To guarantee safe operation, the EV2690-R-00B has input-over-voltage protection, battery over-voltage protection, thermal shutdown, battery-temperature monitoring, and a timer to prevent prolonged charging of a dead battery.
- 4.55V-to-6V Operating Input Voltage Range
- Power Management Function Integrated Input-Current-Limit and Input Voltage Regulation
- Up to 2.5A Charge Current
- Selectable 4.45V / 4.35V / 4.2V Charge Voltage with 0.5% Accuracy
- Battery Temperature Monitoring
- 4-LED drivers for battery fuel gauge indication
- Timer Back-Up Protection
- Battery-Reverse-Leakage Blocking
- Reverse-Boost-Operation for Powering System
- Up to 94.5% 5V Boost Mode Efficiency @ 3A with BATT=4.2V
- Up to 2.1A Output Current Limit in Boost Mode
All-in-One, 2.5A Battery Charger w/ 2.1A Boost Current
The MP2690 is a highly integrated, flexible, switch-mode battery charger with system power-path management and is designed for single-cell Li-ion or Li-polymer battery use in a wide range of applications. The IC can operate in both charge mode and boost mode to allow for full system and battery power management. The IC has an integrated IN-to-SYS pass-through path to pass the input voltage to the system. The pass-through path has built-in over-voltage and over-current protection and has a higher priority over the charging path. When the input power is present, the device operates in charge mode. The MP2690 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 MP2690 also integrates both input current limit and input voltage regulation to manage input power and meet the priority of the system power demand. In the absence of an input source, the IC switches to boost mode through PB to power SYS from the battery. In boost mode, OLIM programs the output current limit, and the IC turns off at light load automatically. The IC also uses output short-circuit protection to disconnect the battery from the load completely in the event of a short-circuit fault. The MP2690 resumes normal operation once the short-circuit fault is removed. The 4-LED driver is integrated for voltage-based fuel gauge indication. Together with torch-light con