Pinout
TP4056 Li-ion charger module pinout
Pins
- IN+ / IN− (5V in — or just the USB connector)
- B+ / B− (the single Li-ion cell, 4.2V charge termination)
- OUT+ / OUT− (protected output — only on boards with the DW01 + FS8205 protection pair)
- Red LED = charging, blue/green LED = done
- Charge current is 1A by default (Rprog 1.2kΩ) — swap Rprog to lower it for small cells
- Basic boards have no load-sharing: power the load from OUT and expect charge termination to misbehave if the load draws during charging
Specifications
| Charger IC | TP4056 (linear, constant current / constant voltage) |
|---|---|
| Input voltage | 5 V nominal (4–8 V per the datasheet) |
| Charge voltage | 4.2 V ±1% |
| Charge current | Up to 1 A, I = 1200 / Rprog (1.2 kΩ = 1 A on most modules) |
| Trickle charge | 1/10 of set current below 2.9 V |
| Charge termination | When current falls to 1/10 of the set value |
| Recharge threshold | ≈ 4.05 V |
| Battery | Single Li-ion / Li-Po cell (1S) only |
| Protection (DW01A boards) | Over-charge ≈ 4.3 V, over-discharge ≈ 2.4 V, over-current and short-circuit cut-off |
| Status LEDs | Red = charging, blue/green = done |
