MH-CD42 Lithium Battery Charge/Discharge Protection Module 5V 2A

MH-CD42 Lithium Battery Charge/Discharge Protection Module 5V 2A is a highly integrated, multifunctional power management solution designed for portable electronic devices. This compact module combines a synchronous charging controller, a high-efficiency boost converter, and comprehensive battery protection circuitry into a single PCB. Furthermore, it allows users to charge a 3.7 V lithium battery from a 5 V source while simultaneously providing a stable 2 A output to power various loads. Consequently, this board eliminates the need for multiple discrete components in DIY power banks or mobile electronic projects. Therefore, you can achieve professional-grade power regulation and safety with minimal assembly effort.

Key Features:

• High-Efficiency Power Path: The module utilizes synchronous rectification technology to achieve up to 96% conversion efficiency, which significantly reduces heat generation during operation.
• Simultaneous Charge and Discharge: Users can charge the connected battery while the module continues to provide a regulated 5 V output to the load.
• Comprehensive Protection: The board features built-in over-temperature, over-current, and short-circuit protection to ensure the safety of both the battery and the connected devices.
• Automatic Load Detection: It intelligently detects when a load is connected or removed, automatically managing power states to conserve battery energy.
• Four-Level LED Indicators: Integrated LEDs provide a visual representation of the battery’s current state of charge, typically showing increments of 25%.

Technical Specifications:

• Input Charging Voltage: 4.5 V to 5.5 V DC (5 V recommended)
• Charging Current: Up to 2.1 A (Maximum)
• Output Voltage: 5.0 V DC (±0.2 V)
• Output Current: 2.0 A (Peak 2.4 A for short durations)
• Battery Nominal Voltage: 3.7 V (Compatible with 18650, Li-Po, and Li-ion cells)
• Discharge Termination Voltage: ≈ 2.9 V
• Efficiency: ≥ 90% (Typically 93% to 96% depending on load)

Mechanical Specifications:

• Mounting Type: Surface mount or through-hole wiring via solder pads.
• Indicator Type: 4 x SMD LEDs (Blue or Green depending on batch).
• Operating Temperature: −20°C to +85°C.
• Durability: Features a rugged PCB design with high-quality inductors for stable power delivery.

Dimensions:

• Board Length: ≈ 25.0 mm
• Board Width: ≈ 16.0 mm
• Board Thickness: ≈ 4.0 mm
• Weight: ≈ 3.0 g (Ideal for ultra-portable builds)

Pinout and Wiring:

• VIN (+ / -): Connect to the 5 V DC charging source (Micro-USB or direct solder pads).
• BAT (+ / -): Connect directly to the positive and negative terminals of the 3.7 V lithium battery.
• VOUT (+ / -): Connect to the 5 V load or USB output connector.
• Wiring Note: Always use high-quality, short-length wires for battery connections to minimize voltage drops during high-current discharge.

Datasheet Reference:

• Download MH-CD42 Power Management Module Datasheet

Commonly Used in:

• Custom Power Banks: Building portable chargers for smartphones and tablets using salvaged 18650 cells.
• IoT Devices: Providing a reliable backup power source for ESP32 or Arduino-based sensors.
• Robotics: Powering 5 V motors and control boards from a single-cell lithium source.

Applications:

• Uninterruptible Power Supplies (UPS): Creating small-scale UPS systems for low-power networked devices.
• Portable Lighting: Managing the charge and discharge cycles for high-power LED flashlights and lanterns.
• Mobile Audio: Driving Bluetooth speaker amplifiers that require stable 5 V rails.

Equivalent Models:

• TP5400 / TP5410: Similar 1 A to 2 A boost/charge controllers often used in similar modular formats.
• IP5306: A popular integrated SOC that offers similar 2 A output and charge capabilities.
• MT3608 + TP4056 Combo: However, this combination requires two separate modules to achieve what the MH-CD42 does in one.

Package Includes:

• 1 x MH-CD42 Lithium Battery Charge/Discharge Protection Module 5V 2A