PW7120 + PW80N03×4 2-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 15A, Overcurrent Protection 30A
Product Details PCB Design Suggestions
2S Lithium-Ion Battery Protection Board (Code 2) — Product Introduction
Overview
This protection board is built around the PWCHIP PW7120 protection IC and three parallel PW8205A8TS MOSFETs. It is designed for 2-cell series lithium-ion battery packs (nominal 7.4 V, 8.4 V fully charged) and provides complete overcharge, over-discharge, overcurrent, and short-circuit protection. The board supports a continuous discharge current of 4.5 A and an overcurrent protection threshold of approximately 14 A.
Specifications
|
Parameter |
Specification |
|
Battery Type |
2S (two-cell series Li-ion pack, 7.4 V nominal, 8.4 V fully charged) |
|
Continuous Discharge Current |
4.5 A |
|
Overcurrent Protection Threshold |
Approx. 14 A |
|
Protection IC |
PW7120 |
|
MOSFETs |
PW8205A8TS × 3 |
|
MOSFET Package |
TSSOP8 |
|
Cell Balancing |
No |
|
Balancing IC |
None |
|
Board Dimensions |
40 mm × 13 mm |
Main Control IC Introduction
The PW7120 is a dedicated protection IC for 2-cell lithium battery packs. It integrates overcharge, over-discharge, overcurrent, and short-circuit protection functions. The device requires minimal external components and offers low power consumption, making it well suited for compact battery protection designs.
Key Features
· Three PW8205A8TS MOSFETs in parallel deliver overcurrent protection up to 14 A.
· TSSOP8-packaged MOSFETs provide excellent thermal performance.
· Continuous discharge current of 4.5 A, suitable for medium-power loads.
· Simple circuit design with only eight bill-of-materials line items, reducing production cost.
· Compact form factor: 40 mm × 13 mm.
Circuit Schematic
Circuit Schematic
Actual PCB Photo
PCB Photo
BOM (Bill of Materials)
|
Item |
Reference Designator |
Model / Specification |
Quantity |
|
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, U4 |
PW8205A8TS SOP8 |
3 |
Typical Applications
· Power tools
· LED lighting
· Bluetooth speakers
· Small motor drives
· Portable electronic products
Wiring Instructions
Please refer to the circuit schematic for battery connection. The charge/discharge interface is P+ and P-.
Documentation and 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 an authorized distributor.
Product page: https://www.pwchip.com/page/180.html
