TP4056 Micro USB Lithium LiPo Battery Charging Module 🔋

The TP4056 Micro USB Lithium LiPo Charging Module is a compact, SMD-built charger designed for single-cell (1S) lithium-ion/lithium-polymer batteries or batteries connected in parallel. Powered by the proven TP4056 linear charging IC, it delivers precise, fully automatic charging with minimal external components—ideal for Arduino, Raspberry Pi, and other microcontroller-based projects, portable devices, and DIY electronics modules.{IMG_TAG_0}

Key Features ⚡

• Fully automatic charge cycle: Constant-current/constant-voltage (CC/CV) charging with intelligent termination.
• Adjustable charge current: 100 mA to 1000 mA via programming resistor; 1 A default from the factory.
• Micro USB input plus solder 5V input pads for flexible integration with your power source.
• SMD construction for durability, efficiency, and compact footprint—easy to embed in custom electronics components and modules.
• LED status indicators: Red = charging, Green = fully charged.
• Self-regulating thermal behavior: The IC manages power dissipation; typical operating temperatures up to ~60°C under load are normal.

Electrical/Charging Specifications 📐

• Battery type: Single-cell (1S) Li-ion/LiPo, nominal 3.7 V, standard 4.2 V full-charge voltage; suitable for parallel-connected cells of the same type and state.
• Input voltage: 5 V from Micro USB or 5 V input pads (do not exceed 5 V).
• Charge current range: ~100 mA to 1000 mA (programmable by resistor); 1 A default.
• Recommended charge current: ≈ 0.37C of battery capacity. Example: a 1000 mAh (1 Ah) cell → ~0.4 A.
• Status indication: Red LED on during charge; Green LED on at charge completion.
• Measurement: Charge current can be monitored on the input side for testing and verification.

Pinout & Connections 🧩

• Micro USB (5V IN): Primary input for a regulated 5 V source.
• 5V IN pads: Alternative solder pads for 5 V input (IN+ / IN−).
• B+ / B−: Connect directly to the positive and negative terminals of the lithium battery.
• OUT+ / OUT−: Output terminals to power your load (e.g., a mobile booster board or other circuit).
• LEDs: Red = charging; Green = full.

Usage Guidelines ✅

• Use quality cables: Low-resistance, high-quality wires for both input and battery leads help maintain the correct charging current.
• Input voltage: Keep the supply at 5 V maximum. Exceeding 5 V can cause overheating and reduced charge current.
• Thermal behavior: The IC may reach around 60°C during normal operation, especially at higher charge currents.
• Polarity and load connection: Connect OUT+ / OUT− correctly. Reverse polarity or misconnection can damage the module and/or the battery.
• Protection circuit activation: On first battery connection, you may read no voltage at OUT+ / OUT−. Apply a 5 V input to wake/activate the protection circuit.
• Power source capacity: If using a phone charger or USB adapter, ensure it can supply at least 1 A at 5 V; otherwise, charging may not start or may be unstable.
• Charge-rate selection: While the module supports up to 1 A, follow the 0.37C guidance to maximize battery health. High current in short bursts can damage cells.

Integration Tips for Projects 🛠️

• Ideal for powering Arduino, Raspberry Pi Pico, ESP-series, and other microcontroller boards via a downstream regulator or boost module.
• Combine with a boost/step-up converter to create compact power-bank-style supplies for IoT sensors and portable electronics.
• Mount within enclosures or custom modules where SMD compactness and simple 5 V input are beneficial.

Important Notes & Safety ⚠️

• Designed for single-cell (1S) lithium batteries only (or parallel packs of identical cells). Not intended for series packs.
• Always verify polarity at B+ / B− and OUT+ / OUT− before applying power.
• Do not leave charging unattended. Ensure adequate ventilation to manage heat.
• For long battery life, select a charge current appropriate to the cell’s capacity and manufacturer recommendations.