PW7120 + PW8205A8TS×3 2-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 4.5A, Overcurrent Protection 13.5A
Product Details PCB Design Suggestions
2S Lithium Battery Protection Board (Code 5) Product Introduction
Overview
This protection board adopts the PW7120 protection IC independently developed by Pingxin Micro, paired with four PW80N03 MOSFETs. It provides complete overcharge, over-discharge, overcurrent, and short-circuit protection for 2S lithium battery packs (two-cell series, 7.4 V nominal, 8.4 V fully charged). The continuous discharge current is 15 A, and the overcurrent protection threshold is approximately 30 A.
Parameters
|
Parameter |
Specification |
|
Battery Type |
2S (two-cell series Li-ion pack, 7.4 V nominal, 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 |
|
Cell Balancing |
None |
|
Balancing IC |
None |
|
Board Dimensions |
45 mm × 15 mm |
Main Control IC Introduction
The PW7120 is a protection IC specifically designed for 2-cell lithium batteries. It integrates overcharge, over-discharge, overcurrent, and short-circuit protection, requires minimal external components, and features low power consumption.
Solution Features
· Four PW80N03 TO252 high-power MOSFETs provide 30 A overcurrent protection.
· The TO252 package offers a large heat-dissipation area, enabling continuous 15 A discharge without stress.
· Suitable for high-current applications such as power tools and electric vehicles.
· Simple circuit design requiring only nine components.
· Compact board size: 45 mm × 15 mm.
Circuit Schematic
Circuit Schematic
PCB Photo
PCB Photo
BOM List
|
No. |
Designator |
Model / Specification |
Qty |
|
1 |
C1, C2 |
0603 0.1 uF / 16 V |
2 |
|
2 |
Q1, Q2, Q3, Q4 |
PW80N03 TO252-3L |
4 |
|
3 |
R1, R2 |
0603 330 Ω ±1 % |
2 |
|
4 |
R3 |
0603 1 kΩ ±1 % |
1 |
|
5 |
U1 |
PW7120 SOT23-6 |
1 |
Typical Applications
Power tools, electric scooters, electric bicycles, high-power LED lights, and electric garden tools.
Wiring Instructions
Please refer to the circuit diagram for battery connection. 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 out to our distributors at https://www.pwchip.com/page/180.html.
