Overview: The TP4056 1A Single-Cell Li-ion/Li-Po Battery Charging Module is a compact, efficient linear charger board designed for safely charging single 3.7V lithium-ion (Li-ion) or lithium-polymer (Li-Po) batteries from a 5V USB source. Featuring the TP4056 IC, this green PCB module provides constant-current/constant-voltage (CC/CV) charging up to 1A, with built-in protections against overcharge, over-discharge, and short circuits. It’s perfect for DIY power banks, portable gadgets, solar chargers, and electronics projects requiring simple battery management. The board includes a micro-USB input for easy connection to wall adapters, computers, or power banks.
Key Specifications:
Parameter
Value/Detail
Battery Configuration
1S (single 3.7V Li-ion/Li-Po cell)
Input Voltage
4.5V – 5.5V DC (via micro-USB)
Charging Current
1A max (adjustable via Rprog resistor; default ~600mA)
Charge Voltage
4.2V ±1% (termination at 100mA trickle)
Efficiency
Up to 90% (low heat generation)
Quiescent Current
<50µA (no-load)
Protection Features
– Overcharge protection (4.2V cutoff) – Over-discharge protection (2.5V) – Short-circuit and reverse polarity protection – Thermal regulation (auto-reduce current if hot)
LED Indicators
Red (charging), Green (fully charged)
Dimensions
Approx. 25mm x 19mm x 5mm
Weight
~3g
Operating Temperature
0°C to +85°C
Connections:
IN+ / IN-: Input pads for 5V DC (or use micro-USB port directly).
BAT+ / BAT-: Battery terminals (positive to BAT+, negative to BAT-; supports 18650 or flat Li-Po cells up to 2000mAh).
OUT+ / OUT-: Load output pads (provides battery voltage during charging; supports pass-through up to 1A).
Micro-USB: Standard Type-B for 5V input (data pins unused).
Rprog Pad: Optional resistor modification for custom charge rates (e.g., 1kΩ for 1A).
Features and Benefits:
Safe and Precise Charging: TP4056 IC ensures CC/CV profile to prevent overcharging and extend battery life; automatic trickle charge for deeply discharged cells.
USB-Powered Convenience: Direct micro-USB input eliminates the need for external adapters—plug into any 5V source.
Pass-Through Operation: Powers connected loads while charging, ideal for uninterrupted device use.
Visual Status: Dual-color LED provides clear feedback (red for in-progress, green for complete; blinks on errors).
Compact and Robust: Green PCB with SMD components for space-saving designs; high-current traces handle 1A without overheating.
No External Components Needed: Fully integrated with protection diodes and thermal shutdown for plug-and-play reliability.
Applications:
DIY portable power banks and USB chargers.
Solar-powered battery backups.
RC toys, drones, and wearable tech.
Arduino or Raspberry Pi battery modules.
Emergency lighting or flashlight upgrades.
Note: Use only with rechargeable 3.7V Li-ion/Li-Po cells; do not charge non-lithium batteries. Monitor temperature during high-current charging and ensure proper ventilation. For discharge protection, pair with a BMS board.
