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600kHz Switching Li-Ion Battery Charger
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The MP26123 is a monolithic DC-DC step-down switching charger for 2- or 3-cell Li-ion battery packs. It has an integrated high-side power MOSFET can output up to a 2A charge current. It also has peak-current–mode control for fast loop response and easy compensation. The MP26123 uses a sense resistor to control a programmable charge current, and accurately regulates the charge current and charge voltage using two control loops. The MP26123 has multiple fault condition protections that include cycle-by-cycle current limiting and thermal shutdown. Other safety features include battery temperature monitoring and protection, charge status indication and programmable timer to cease the charging cycle when timer out. The MP26123 requires a minimal number of readily-available external components. The MP26123 is available in a 4mm x 4mm 16-pin QFN package.
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Features & Benefits
- Charges 2- or 3-Cell Li-Ion Battery Packs
- Wide Operating Input Range
- Programmable Charging Current of up to 2A
- ±0.75% VBATT Accuracy
- 0.2Ω Integrated Power MOSFET
- Up to 90% Efficiency
- Fixed 600kHz Frequency
- Preconditioning for Fully Depleted Batteries
- Charging Status Indicator
- Input Supply Fault Indicator
- Thermal Shutdown
- Cycle-by-Cycle Over-Current Protection
- Battery Temperature Monitor and Protection
EV26123-R-00A Evaluation Kit 2A, 24V Input, 600kHz, Switching Li-Ion Battery Charger Evaluation Board
The EV26123-R-00A is an evaluation board for the MP26123, a high-performance 2-cell or 3-cell Li-ion battery switching charger with a built-in, internal power MOSFET.
The EV26123-R-00A achieves up to 2A of charge current across a wide input supply range. The charge current can be configured by sensing the current through an accurate sense resistor.
The MP26123 regulates the charge current and full-charge voltage using two control loops to achieve a high-accuracy constant current (CC) charge and constant voltage (CV) charge.
Fault protections include timeout control, full battery termination control, thermal protection, battery temperature monitoring, and protection. The board also indicates AC adapter power good, as well as the system’s charge status.