Battery Charging Module Design

flux

1:41

Here’s an in-depth walkthrough of your “TP4056 USB-C with Battery protection” design.
1. Project Purpose
A compact 1-cell lithium-ion charger and protection module that
  • Accepts 5 V from a USB-C jack
  • Charges a single Li-ion cell up to 4.2 V at up to 1 A
  • Provides over-charge, over-discharge, and over-current protection
  • Indicates charge status with an LED
Commonly used in DIY power-banks, portable electronics, and battery maintenance rigs.

2. Core Functional Blocks

BlockKey ComponentsFunction
Input & NegotiationUSB-C 2.0 Receptacle (J1)Receives 5 V USB power; CC pin resistors (not shown) set default current mode.
Charge ControllerTP4056 (U2)Linear charger IC; controls constant-current/constant-voltage profile.
PROG Resistor1.2 kΩ 0603 Resistor (R3)Sets charge current: ICHG≈1200 mVRPROG=1 AI_{CHG}\approx\frac{1200\text{ mV}}{R_{PROG}}=1\text{ A}
Decoupling Caps10 µF 0603 Capacitor (C2)
& 100 nF 0603 Capacitor (C3)Stabilize VCC rail and ensure IC stability.
Protection ICDW01A (U1)Monitors cell voltage & current; outputs fault signals.
Dual MOSFET SwitchFS8205A (U3)Implements charge/discharge cut-offs under control of U1.
Status IndicatorLTST-C19HE1WT (LED1)
& 1 kΩ 0603 Resistors (R4, R5)Shows charging (CHRG) and standby/full (STDBY) via TP4056 status pins.
Battery & Power PortalsPower net portals (BAT+, BAT-, VCC, GND)Tie rails across the schematic for clarity; connect to external pads.
3. Signal & Power Flow
  1. USB-C Input (J1)
    • 5 V appears on the VBUS pin.
    • (Note: CC1/CC2 resistors should be added externally to advertise 500 mA or 1 A.)
  2. Charger Stage (U2)
    • VIN → internal linear regulator → charges BAT pin.
    • R3 programs ~1 A charge current.
    • C2/C3 decouple VIN and BAT for stability.
    • CHRG and STDBY open-drain pins drive LED1 through R4/R5.
  3. Protection Stage (U1 + U3)
    • U1 monitors cell voltage on VDD/VM and current via FS8205A sense.
    • On fault, U1 toggles CO/DO signals to turn off both MOSFETs in U3, isolating the cell.
    • R1 (1 kΩ) and C1 form a local decoupling/filter network for U1.
  4. External Connections
    • BAT+ / BAT- portals feed the cell or holder.
    • P+ / P- portals supply the load when protection MOSFETs allow discharge.
    • GND and VCC portals tie rails for peripheral connections or test points.
4. Key Design Choices & Trade-Offs
  • Linear vs. Switching Charger
    • TP4056 is simple and low-noise but wastes power as heat at high charge currents.
    • For >1 A or multi-cell, a switching solution would be more efficient.
  • USB-C CC Implementation
    • This design omits CC pull-downs. Without proper CC resistors (5.1 kΩ), some hosts may not enable VBUS.
    • Improvement: Add two 5.1 kΩ resistors from CC1/CC2 to ground to advertise default current.
  • Thermal Management
    • At 1 A, TP4056 dissipates (5V−VBAT)×I(5 V - V_{BAT}) \times I → ~4 W at empty cell, requiring a heat sink or PCB copper pour.
  • Component Sizing
    • R3 = 1.2 kΩ (E24) chosen for 1 A.
    • LED resistors (R4/R5) sized at 1 kΩ to limit LED current to ~2 mA.
5. Potential Challenges & Considerations
  • Thermal Runaway
    • Ensure adequate copper area under U2 for heat spreading.
  • Cell Chemistry Variants
    • TP4056 is tailored for Li-ion; LiFePO₄ needs different voltage target.
  • False Disconnects
    • Transient currents can trigger protection; consider adding small RC on U1 sense pins.
6. Real-World Applications
  • DIY power banks
  • Battery maintenance/trickle chargers
  • Embedded backup power modules
  • Portable sensor / IoT battery packs
7. Future Enhancements
  • Add USB-C CC resistors for host compliance.
  • Switching regulator front-end (e.g., 5 V→4.2 V) for higher efficiency.
  • Battery fuel gauge (e.g., coulomb counter) for SOC display.
  • Thermistor on CELL pin for temperature-based charge control.
  • Multi-pack support by paralleling TP4056 or using a multi-cell charger IC.
This modular, low-cost design balances simplicity and safety, making it a versatile starting point for many Li-ion charging applications.
Add CC resistors
Thermal management
Switching regulator
Fuel gauge IC
Thermistor integration
330 days
Sign up to send
U3
BAT+
Vcc
BAT+
P+
BAT-
Vcc
BAT+
BAT-
BAT+
BAT-
P-
R3
Resistance
1.2kΩ
BAT
LED1
R2
Resistance
100 Ω
R4
Resistance
1kΩ
R5
Resistance
1kΩ
U2
J1
1
C2
Capacitance
10uF
C1
Capacitance
100nF
2
C3
Capacitance
100nF
U1
2
1
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

TP4056 USB-C with Battery protection

TP4056 USB-C with Battery protection thumbnail
TP4056 1S 1C charger with USB-c connector and battery protection. Copied everything from here: https://easyeda.com/modules/TP4056-Charging-module-USB-C-data_a4752b5b6c6a4c93afdd8b7119d0622c
P+ and P- are the outputs but don't have a connector or solder pad yet.
Only the schematic has been designed. I didn't do anything on the PCB part! Place these components at your own design!
DISCLAIMER: I did not design this nor do i have knowledge about electronics. I'm still learning and i copied this for own use. USE AT OWN RISK!

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$0.28–$0.84

Digi-Key

$0.87–$2.26

LCSC

$1.52–$1.75

Mouser

$2.30

Verical

$0.23–$0.54

Controls