Description

Lithium Battery Charging Protection Module

• Providing mobile power for your DIY projects has never been easier with the MH-CD42 Power DIY board!
• This tiny board offers simultaneous charge and discharge, lithium battery protection, and a 4 level LED
  indicator.
• Connect any kind of 3.7V Lithium battery to have a 5V output with current up to 2.1A.
• When charging, the four-level battery indicator starts with one flashing LED, meaning the battery is less
  than 25% full.
• After some time, 2 LED will lit up and the first one would stop flashing.
• That means your battery is 25% to 49% full.
• Your battery is fully charged when all 4 LEDs are lit and not flashing.
• In discharge mode, the same definition applies but in reverse.

• Charging voltage: DC4.5V-5.5V (recommended DC5V)
• Charging current: 0-2.1A
• Charging quiescent current: 100uA
• Full voltage: 4.2V ± 1%
• Discharge current: 0-3.5A
• Discharge quiescent current: 50uA
• Discharge efficiency: up to 96%
• Output voltage: 5V
• Output current: 0-2.1A
• Ambient temperature: -20~ 85°C
• The module comes with a lithium battery protection function (for lithium batteries without protection, with protection board)
• Overcurrent protection (OCP)
• Overvoltage protection (OVP)
• Short circuit protection (SCP)
• Over temperature protection (OTP)
• Charge and discharge power level 4 interval indication

Pin Description

• VIN: The correct input of the charging port (DC4.5V-5.5V (recommended DC 5V)
• GND: negative input of the charging port –
• GND: Lithium battery –
• BAT: Lithium battery
• GND: Output negative output –
• VOUT: Output positive output
• KEY: Output enable trigger port (low pulse trigger)

Note:

• In the discharge mode (the charging mode KEY function is invalid), the KEY port is triggered once, and the output is turned on; the KEY port is continuously triggered twice, and the output is turned off.
• When the load is first connected, the output will be automatically turned on. If the small fish 50MA is loaded, the output will be turned off after 30 seconds; if the load is greater than 50MA, the output will be continuously turned on.
• Allow one side to discharge while charging (Note: this is the output voltage >4.7/<5V)

Wiring Instructions:

• When the module is plugged in, the output will switch to external power supply (it will be powered off for 0.3s). When charging, the output voltage will be less than >4.7/<5V, depending on the charger load capacity!
• Trigger mode: low level trigger (ground)
• Connect to the single-chip microcomputer, if the connection is less than the load KEY, you can connect the single-chip microcomputer for about 20s to give a low level to keep the module working continuously.

Indicator Light

Applications:

• Car charging retrofit
• Driving recorder power supply
• Mobile power / charging treasure
• Portable devices such as mobile phones and tablets

​Package Included:

• 1 X 2A 5V Lithium battery charging protection module

Lithium Battery Charging Protection Module

electra-group.com