PW7127 + PW4406A×4 3-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 6A, Overcurrent Protection 14A
Product Details PCB Design Suggestions
3S Li-ion Battery Protection Board — Code 13 Product Brief
Overview
This protection board is built around PWCHIP’s proprietary PW7127 protection IC and two PW4406A MOSFETs. It provides complete overcharge, over-discharge, overcurrent, and short-circuit protection for 3S lithium-ion battery packs (three cells in series, 11.1 V nominal, 12.6 V fully charged). The board supports a continuous discharge current of 3 A, with an overcurrent protection threshold of approximately 7 A. It also supports NTC temperature protection for enhanced safety.
Specifications
|
Parameter |
Specification |
|
Battery type |
3S (three-cell Li-ion pack, 11.1 V nominal, 12.6 V fully charged) |
|
Continuous discharge current |
3 A |
|
Overcurrent protection current |
~7 A |
|
Protection IC |
PW7127 |
|
MOSFET |
PW4406A × 2 |
|
MOSFET package |
SOP8 |
|
Cell balancing |
None |
|
NTC temperature protection |
Yes |
|
Balancing IC |
None |
Main Control IC
PW7127 is a protection IC specifically designed for 3-cell lithium-ion battery packs. It integrates overcharge, over-discharge, overcurrent, and short-circuit protection, supports high-precision voltage detection, and includes NTC temperature protection to prevent overheating.
Key Features
· PW7127 with built-in NTC temperature protection prevents battery overheating.
· Two PW4406A SOP8 MOSFETs provide ~7 A overcurrent protection and 3 A continuous discharge.
· SOP8 package is easy to solder and keeps BOM cost low.
· Temperature protection improves overall system safety.
· Ideal for temperature-sensitive 3S battery pack applications.
Circuit Schematic
Code 13 schematic
BOM
|
No. |
Reference |
Model / Specification |
Qty |
|
1 |
C1, C2 |
0603 100 nF / 25 V |
2 |
|
2 |
C3 |
0603 1 µF / 25 V |
1 |
|
3 |
R1, R2, R3 |
0603 1 kΩ ±1 % |
3 |
|
4 |
R4 |
0603 2.2 kΩ ±1 % |
1 |
|
5 |
RNTC |
103AT B=3435 ±1 % |
1 |
|
6 |
U1 |
PW7127 SOP8 |
1 |
|
7 |
U2, U3 |
PW4406A SOP8 |
2 |
Typical Applications
Medical devices, premium Bluetooth speakers, portable products with high safety requirements, energy-storage equipment.
Wiring Notes
Please wire the battery according to the labels on the schematic. 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 an authorized distributor at https://www.pwchip.com/page/180.html.
