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Off-line li-ion battery charger design example
Description
Now that many portable electrical systems and products use rechargeable batteries as their power supply, the customer has many choices of charging methods, i.e., special power management ICs, MCU controlled, or even simple logic parts. When one considers safe charging, time-efficiency and low cost factors, the MCU controlled charging method can be used as a recharge solution within many application fields.
The Off-Line Li-Ion Battery Charger with the
NXP 8-bit P89LPC916 possesses characteristics of safe charging, time efficiency, and small packaging. Using PWM and ADC, the P89LPC916 accurately controls different charge phases, allowing the battery to become fully charged and preventing overcharging. This solution is suitable for a Li-Ion battery rated 700 mAh to 750 mAh, discharged voltage 3.6 V, and limited voltage 4.2 V.
Block Diagram
Documentation
Products
Below are recommended microcontrollers for use in implementing this design to a system.
Comparison Table
| Product | Pins | On-Chip Flash |
On-Chip RAM |
Comments |
| P89LPC916FDH | 16 | 2KB | 256B | Most Cost Efficient device for this application. |
| P89LPC917FDH | 16 | 2KB | 256B | with 2 PWM |
MCUs
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More Information
Images
Working Prototype
Schematics
- Off-Line Li-Ion Battery Charger Schematics
Example Code
- Off-Line Li-Ion Battery Charger Example Code
Gerber Files
- Off-Line Li-Ion Battery Charger Gerber Files
Bill of Materials
- Off-Line Li-Ion Battery Charger Bill of Materials
Disclaimer
This design example shows possible hardware and software techniques used to implement the design.
It is imperative that the viewer use sound engineering judgment in determining the fitness of this design example for any particular application.
This design example may include information from 3rd parties and/or information which may require further licensing or otherwise.
Additional hardware or software design may be required.
NXP Semiconductors does not support or warrant this information for any purpose other than an informational design example.
