PW7120 + PW4406A×2 2-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 3A, Overcurrent Protection 7A
Product Details PCB Design Suggestions
2S Lithium Battery Protection Board (Code 6) Product Introduction
Overview
This protection board adopts Pingxin Micro’s proprietary PW7120 protection chip, paired with four PW80N03 MOSFETs, to provide complete overcharge, over-discharge, overcurrent, and short-circuit protection for 2S lithium battery packs (two cells in series, 7.4 V nominal, 8.4 V fully charged). It delivers a continuous discharge current of 15 A and an overcurrent protection threshold of approximately 30 A. The integrated PW2213 cell-balancing chip effectively extends the service life of the battery pack.
Specifications
|
Parameter |
Specification |
|
Battery Type |
2S (two-cell series lithium battery pack, 7.4 V, 8.4 V fully charged) |
|
Continuous Discharge Current |
15 A |
|
Overcurrent Protection Current |
Approx. 30 A |
|
Protection IC |
PW7120 |
|
MOSFET |
PW80N03 × 4 |
|
MOSFET Package |
TO252 |
|
Balancing Function |
With balancing |
|
Balancing IC |
PW2213 |
|
Board Dimensions |
48 mm × 20 mm |
Main Control Chip Introduction
PW7120 is a protection IC specially designed for 2-cell lithium batteries. It integrates overcharge, over-discharge, overcurrent, and short-circuit protection, requires minimal external components, and offers low power consumption.
PW2213 is a high-precision battery balancing IC that effectively eliminates voltage differences between the two cells, extends battery pack service life, and ensures charge/discharge consistency.
Solution Features
· Four PW80N03 TO252 high-power MOSFETs, 30 A overcurrent protection, and 15 A continuous discharge capability
· PW2213 balancing function automatically equalizes the voltage of the two cells
· Balancing function extends battery pack cycle life by more than 30%
· TO252 package delivers excellent heat dissipation, supporting long-term high-current discharge without overheating
· Ideal for high-end applications requiring long cycle life and high current
· Compact board size: 48 mm × 20 mm
Circuit Schematic
Circuit Schematic
PCB Photo
PCB Photo
BOM (Bill of Materials)
|
No. |
Reference |
Model / Specification |
Qty |
|
1 |
C1, C2, C3, C4 |
0603 0.1 µF / 25 V |
4 |
|
2 |
Q1, Q2 |
PW2302 SOT23-3 |
2 |
|
3 |
Q3, Q4, Q5, Q6 |
PW80N03 TO252-3L |
4 |
|
4 |
R1, R2 |
0603 330 Ω ±1% |
2 |
|
5 |
R3, R7, R8 |
0603 1 kΩ ±1% |
3 |
|
6 |
R5, R6 |
0603 620 Ω ±1% |
2 |
|
7 |
U1 |
PW7120 SOT23-6 |
1 |
|
8 |
U6, U7 |
PW2213 SOT23-6L |
2 |
Typical Applications
Power tools, electric scooters, massage guns, high-power LED lights, electric garden tools, and car vacuum cleaners.
Wiring Instructions
Please refer to the labels on the circuit schematic for battery connection. The charge/discharge terminals are P+ and P-.
Documentation & Technical Support
We provide chip 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.
