PW7120 + PW4406A×4 2-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 6A, Overcurrent Protection 14A, with Balancing Circuit
Product Details PCB Design Suggestions
2S Lithium Battery Protection Board (Code 3) — Product Introduction
Overview
This protection board adopts the PW7120 protection IC independently developed by PWCHIP, paired with two PW4406A MOSFETs, to deliver complete overcharge, over-discharge, overcurrent, and short-circuit protection for 2S (two-cell series lithium battery pack, 7.4 V nominal / 8.4 V fully charged) lithium battery packs. It supports a continuous discharge current of 3 A, with an overcurrent protection threshold of approximately 7 A.
Key Specifications
|
Parameter |
Specification |
|
Battery Type |
2S (two-cell series lithium battery pack, 7.4 V / 8.4 V fully charged) |
|
Continuous Discharge Current |
3 A |
|
Overcurrent Protection Current |
Approx. 7 A |
|
Protection IC |
PW7120 |
|
MOSFET |
PW4406A × 2 |
|
MOSFET Package |
SOP8 |
|
Balance Function |
None |
|
Balance IC |
None |
|
Board Dimensions |
36 mm × 10 mm |
Main Control IC Introduction
The PW7120 is a protection IC specially designed for 2-cell lithium batteries. It integrates overcharge, over-discharge, overcurrent, and short-circuit protection, features a simple peripheral circuit, and offers low power consumption.
Solution Features
· Two PW4406A MOSFETs provide 7 A overcurrent protection.
· SOP8 package for easy soldering and simple maintenance.
· Continuous discharge current of 3 A meets everyday consumer electronics requirements.
· Only seven components are required, resulting in an extremely low BOM cost.
· Ultra-compact board size of 36 mm × 10 mm, ideal for compact products.
Circuit Schematic
Circuit Schematic
PCB Physical Photo
PCB Physical Photo
BOM (Bill of Materials)
|
No. |
Designator |
Model / Specification |
Qty |
|
1 |
C1, C2 |
0603 0.1 µF / 16 V |
2 |
|
2 |
R1, R2 |
0603 330 Ω ±1 % |
2 |
|
3 |
R3 |
0603 1 kΩ ±1 % |
1 |
|
4 |
U1 |
PW7120 SOT23-6 |
1 |
|
5 |
U2, U3 |
PW4406A SOP8 |
2 |
Typical Application Scenarios
Portable products, LED flashlights, small fans, USB small home appliances, and motor drives.
Wiring Instructions
Please refer to the circuit diagram for battery connection. The charge/discharge terminals are P+ and P-.
Documentation & Technical Support
We provide chip samples, technical documentation, and circuit design support. To learn more about available solutions or request materials, please contact us at support@pwchip.com or reach out to an agent via https://www.pwchip.com/page/180.html.
