MT6375P Charging IC Complete Tutorial – MediaTek 5G Smartphone Charging Circuit Explained

Modern smartphones use advanced power management systems, and one of the most important components in MediaTek devices is the MT6375P Charging IC. This IC is responsible for battery charging, system power generation, battery sensing, thermal monitoring, and communication with the CPU.

Important: Although technicians usually call it a Charging IC, it actually performs multiple functions inside the smartphone.

Popular Smartphones Using MT6375P

This IC is widely used in many MediaTek 5G smartphones. Some examples include:

Samsung Galaxy A15 5G
Vivo V27 5G
Motorola G54 Neo
Oppo Reno 12 Pro
Redmi Note 12 Pro 5G

Apart from these models, MT6375P is also used in many smartphones from Tecno, Infinix, Vivo, Oppo, Samsung, Redmi, and iQOO.

Main Functions of MT6375P Charging IC

1. Battery Charging Circuit

The main function of this IC is to charge the battery. When a charger is connected, 5V input enters the IC through the VBUS pins.

Inside the IC, this voltage is processed and converted into a safe charging current for the battery.

Note: If VBUS voltage does not reach the IC pins, charging will not start.

2. System Power Supply (BPPH / VS)

The IC also generates a system voltage called BPPH, which is known as VS in MediaTek devices.

This voltage usually ranges between:

3.0V – 4.2V

This supply powers many components in the smartphone:

Graphics IC
Light IC
Power Amplifier (PA)
APT IC
LDO Regulators

3. Fuel Gauge Circuit

The Fuel Gauge monitors battery current and battery percentage.

In older MediaTek phones, this circuit was inside the PMIC. But in phones using MT6375P, the fuel gauge is integrated inside the charging IC.

Common Faults if Fuel Gauge Section Fails:

Battery percentage incorrect
Charging not increasing
False charging
Battery detection problem

4. Type-C CC1 & CC2 Detection

Modern smartphones use USB Type-C connectors. Inside the connector there are two important pins:

CC1 (Configuration Channel 1)
CC2 (Configuration Channel 2)

These lines are connected to the charging IC and help detect the charger orientation.

If CC1 or CC2 line becomes damaged or disconnected, the phone may fail to detect the charger.

5. DM & DP Data Lines

The charging IC also connects to the DM (Data Minus) and DP (Data Plus) lines.

These lines are used for:

USB communication
Fast charging protocol detection

If these lines are shorted or broken, the phone may show:

Charging detected but not increasing
Slow charging
Charger not detected

Battery Sensing Circuit

The charging IC also includes a Battery Sense Circuit.

Apart from the main battery voltage, separate sensing lines are used:

VBAT Sense Positive
VBAT Sense Ground

These lines help the IC detect whether a battery is connected.

If these sensing pins fail, the phone may only show the battery logo but will not turn on.

Battery Thermal Monitoring

Smartphone batteries include an NTC thermistor that measures battery temperature.

The charging IC monitors this temperature through the battery thermal circuit.

If abnormal temperature is detected, the phone may display errors like:

Battery Temperature Too High
Battery Temperature Too Low
Contact Service Center

Boot Capacitor and Buck Coil

Near the charging IC you will find a Boot Capacitor and a 1µH Buck Coil.

These components are part of the switching regulator that generates system voltage.

If the boot capacitor value changes or the coil becomes weak, the phone may show false charging issues.

I2C Communication with CPU

The charging IC communicates with the processor using the I2C protocol.

The two main lines are:

SDA – Serial Data Line
SCL – Serial Clock Line

If these lines are disconnected, the CPU cannot communicate with the charging IC, and charging may not be detected.

Common Charging Faults Related to MT6375P

Charging logo appears and disappears
Charger connects and disconnects repeatedly
Phone not charging
Battery percentage not increasing
False charging indication
Phone dead

Repair Tip: If the phone shows charging detection issues, check the charging IC pins, PMID voltage, CC1/CC2 lines, and nearby capacitors before replacing the IC.

Conclusion

The MT6375P Charging IC is a powerful component that manages battery charging, system voltage generation, battery sensing, thermal protection, and communication with the CPU.

Understanding its internal sections and pin functions is extremely important for mobile hardware technicians when diagnosing charging problems in modern MediaTek smartphones.