PW7126 + PW80N03×2 3-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 7A, Overcurrent Protection 10A
Product Details PCB Design Suggestions
3S Li-ion Battery Protection Board — Code 9 Product Introduction
Overview
This protection board adopts Pingxin Micro’s self-developed PW7126 protection IC, paired with four PW4406A MOSFETs. It delivers complete overcharge, over-discharge, overcurrent, and short-circuit protection for 3S (three-cell series Li-ion) battery packs rated at 11.1 V nominal and 12.6 V fully charged. The board supports a continuous discharge current of 6 A, with an overcurrent protection threshold of approximately 7 A. An integrated PW2213 cell-balancing IC effectively extends the service life of the battery pack.
Specifications
|
Parameter |
Specification |
|
Battery Type |
3S (three-cell series Li-ion pack, 11.1 V nominal, 12.6 V fully charged) |
|
Continuous Discharge Current |
6 A |
|
Overcurrent Protection Current |
~7 A |
|
Protection IC |
PW7126 |
|
MOSFET |
PW4406A × 4 |
|
MOSFET Package |
SOP8 |
|
Cell Balancing |
With balancing |
|
Balancing IC |
PW2213 |
Main Control IC Introduction
PW7126 is a protection IC dedicated to 3-cell Li-ion batteries. It integrates overcharge, over-discharge, overcurrent, and short-circuit protection, and supports high-precision voltage detection.
PW2213 is a high-precision cell-balancing IC that effectively eliminates voltage differences among cells, extends battery pack service life, and ensures consistent charge/discharge behavior.
Solution Features
· Four PW4406A MOSFETs in parallel, 7 A overcurrent protection, 6 A continuous discharge
· PW2213 three-cell balancing function automatically equalizes the voltage of all three cells
· Balancing function extends battery pack cycle life by more than 30%
· SOP8-packaged MOSFETs offer a balanced cost-performance ratio
· Ideal for 3S battery pack applications requiring long service life
Circuit Schematic
Circuit Schematic
PCB Physical Image
Dimensions: 58 mm × 33 mm
PCB Physical Image
BOM (Bill of Materials)
|
No. |
Designator |
Model / Specification |
Qty |
|
1 |
C1, C2, C3 |
0603 0.1 µF / 25 V |
3 |
|
2 |
CVC1 |
0603 1 µF / 16 V |
1 |
|
3 |
CVC2, CVC3 |
0603 0.1 µF / 16 V |
2 |
|
4 |
Q1, Q2, Q3 |
PW2302 SOT-23-3L |
3 |
|
5 |
R1, R2, R3, RVC1, RVC2, RVC3 |
0603 1 kΩ ±1% |
6 |
|
6 |
RBAL1, RBAL2, RBAL3 |
2512 620 Ω ±1% |
3 |
|
7 |
RSENSE |
2512 14 mΩ ±1% |
1 |
|
8 |
RVIN, RVM |
0603 2.21 kΩ ±1% |
2 |
|
9 |
U1 |
PW7126 SOP8 |
1 |
|
10 |
U2, U3, U4, U5 |
PW4406A SOP8 |
4 |
|
11 |
U6, U7, U8 |
PW2213 SOT23-6L |
3 |
Typical Applications
Power tools, electric scooters, massage guns, high-power LED lights, and electric garden tools.
Wiring Instructions
Please refer to the circuit schematic for battery connection. The charge/discharge interface is P+ and P-.
Documentation & Technical Support
We provide IC samples, technical documentation, and circuit design support. For more solutions or to request materials, please contact us at support@pwchip.com or reach out to our distributors at https://www.pwchip.com/page/180.html.
