PW7126 + PW80N03×4 3-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 15A, Overcurrent Protection 20A
Product Details PCB Design Suggestions
3S Li-ion Battery Protection Board — Code 10 Product Brief
Overview
This protection board is built around PWCHIP’s proprietary PW7126 protection IC and two PW80N03 MOSFETs. It provides complete overcharge, over-discharge, overcurrent, and short-circuit protection for 3S lithium-ion battery packs (three cells in series, 11.1 V nominal, 12.6 V fully charged). The board supports a continuous discharge current of 7 A, with an overcurrent protection threshold of approximately 10 A.
Specifications
|
Parameter |
Specification |
|
Battery type |
3S (three-cell Li-ion pack, 11.1 V nominal, 12.6 V fully charged) |
|
Continuous discharge current |
7 A |
|
Overcurrent protection current |
~10 A |
|
Protection IC |
PW7126 |
|
MOSFET |
PW80N03 × 2 |
|
MOSFET package |
TO-252 |
|
Cell balancing |
None |
|
Balancing IC |
None |
Main Control IC
PW7126 is a protection IC specifically designed for 3-cell lithium-ion battery packs. It integrates overcharge, over-discharge, overcurrent, and short-circuit protection, and supports high-precision voltage detection.
Key Features
· Two PW80N03 TO-252 high-power MOSFETs deliver 10 A overcurrent protection.
· The TO-252 package offers a large heat-dissipation area, ensuring stable 7 A continuous discharge.
· Only 11 components are required, resulting in an extremely low BOM cost.
· Ideal for medium- to high-power 3S battery pack applications.
· PW7126 provides high-precision voltage detection.
Circuit Schematic
Code 10 schematic
BOM
|
No. |
Reference |
Model / Specification |
Qty |
|
1 |
CVC1 |
0603 1 µF / 25 V |
1 |
|
2 |
CVC2 |
0603 0.1 µF / 25 V |
1 |
|
3 |
CVC3 |
0603 0.1 µF / 16 V |
1 |
|
4 |
RSENSE |
2512 10 mΩ ±1 % |
1 |
|
5 |
RVC1, RVC2, RVC3 |
0603 1 kΩ ±1 % |
3 |
|
6 |
RVIN, RVM |
0603 2.21 kΩ ±1 % |
2 |
|
7 |
U1 |
PW7126 SOP8 |
1 |
|
8 |
U2, U4 |
PW80N03 TO-252 |
2 |
Typical Applications
Power tools, electric vehicle lights, high-power LED lights, electric fans, portable vacuum cleaners.
Wiring Notes
Please wire the battery according to the labels on the schematic. The charge/discharge terminals are P+ and P-.
Documentation and Technical Support
We provide chip samples, technical documentation, and circuit design support. For more solutions or to request documentation, please contact us at support@pwchip.com or reach an authorized distributor at https://www.pwchip.com/page/180.html.
