PW7126 + PW4406A×4 3-Cell Li-ion Battery Charge-Discharge Protection Board Solution, Continuous 6A, Overcurrent Protection 7A
Product Details PCB Design Suggestions
3S Li-ion Battery Protection Board — Code 14 Product Brief
Overview
This protection board is built around PWCHIP’s proprietary PW7127 protection IC and four 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 6 A, with an overcurrent protection threshold of approximately 14 A. It integrates the PW2213 balancing IC to effectively extend battery pack service life, and 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 |
6 A |
|
Overcurrent protection current |
~14 A |
|
Protection IC |
PW7127 |
|
MOSFET |
PW4406A × 4 |
|
MOSFET package |
SOP8 |
|
Cell balancing |
Yes |
|
NTC temperature protection |
Yes |
|
Balancing IC |
PW2213 |
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.
PW2213 is a high-precision cell balancing IC. It effectively eliminates voltage differences between cells, extends battery pack service life, and ensures consistent charge/discharge performance.
Key Features
· PW7127 with built-in NTC temperature protection prevents battery overheating.
· Four PW4406A SOP8 MOSFETs in parallel deliver ~14 A overcurrent protection and 6 A continuous discharge.
· Three-cell balancing with PW2213 automatically equalizes the voltage of all three cells.
· The combination of temperature protection and cell balancing provides dual assurance for safety and cycle life.
· Ideal for high-current 3S battery pack applications with stringent safety requirements.
Circuit Schematic
Code 14 schematic
BOM
|
No. |
Reference |
Model / Specification |
Qty |
|
1 |
C1, C2, C3 |
0603 0.1 µF / 25 V |
3 |
|
2 |
CVC1 |
0603 1 µF / 50 V |
1 |
|
3 |
CVC2, CVC3 |
0603 0.1 µF / 50 V |
2 |
|
4 |
Q1, Q2, Q3 |
PW2302 SOT-23-3 |
3 |
|
5 |
R1, R2, R3, RVC1, RVC2, RVC3 |
0603 1 kΩ ±1 % |
6 |
|
6 |
R4 |
0603 2.2 kΩ ±1 % |
1 |
|
7 |
RBAL1, RBAL2, RBAL3 |
2512 620 Ω ±1 % |
3 |
|
8 |
RNTC |
103AT B=3435 ±1 % |
1 |
|
9 |
RSENSE |
2512 10 mΩ ±1 % |
1 |
|
10 |
U1 |
PW7127 SOP8 |
1 |
|
11 |
U2, U3, U4, U5 |
PW4406A SOP8 |
4 |
|
12 |
U6, U7, U8 |
PW2213 SOT23-6L |
3 |
Typical Applications
Power tools, medical devices, premium energy-storage products, electric garden tools, vehicle-mounted 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.
