MN1381SG

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active High
Reset Timeout:	115 µs Typical
Voltage - Threshold:	2.4V
Operating Temperature:	-20°C ~ 70°C (TA)
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package:	TO-92
Base Part Number:	MN138*

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Introduction

MN1381SG is an advanced power management IC (PMIC) designed for USB Type-C mobile device PD, USB Type-C power adapter, and USB Type-C data charging port protection applications. It forms a complete protection solution with ON Semiconductor CPC series Type-C port controllers, providing complete ESD, UVLO, OVP, UVP, OCP, and OTP protection for USB Type-C. MN1381SG has two power supply channels, each of which can independently support single-input 5V3A and dual-input 5V3A power operating modes. This article introduces the application field and working principle of the MN1381SG PMIC.

Application Field of MN1381SG

MN1381SG is widely used in applications such as PD mobile devices, USB Type-C power adapters and data charging ports. Specifically, it provides power switching protection requirements for the USB Type-C PD Mobile device D+/D- terminals, and is suitable for applications such as 24V Max Smartphone PD. It can also provide comprehensive over-charging, over-voltage, over-current, and over-temperature protection for the USB Type-C power adapter and the data charging port. It has two power supply channels, each of which supports single-input 5V3A and dual-input 5V3A power supply mode.

Working Principle of MN1381SG

The MN1381SG PMIC consists of three main blocks: Current-Sense Amplifier (CSA), Over-Current Protection (OCP), and Thermal-Shutdown (TSD).The CSA block is responsible for current sensing, providing protection against over-current. The OCP block is responsible for detecting over-voltage conditions and limiting the voltage to maintain the desired voltage level. Finally, the TSD block is responsible for monitoring the chip\'s temperature and shutting down the chip if the temperature exceeds the set temperature.The current-sense amplifier (CSA) compares the voltage of the differential input current sensing signal with a reference voltage, converts the differential input current of the two power supply channels into the single-ended output voltage. The value of the converted single-ended output voltage determines the power supply channel being supplied with the required current by controlling the power MOSFET drivers.The over-current protection (OCP) block detects over-current using an N-channel MOSFET. When the input voltage of the power supply channel exceeds the set voltage, the OCP block will turn off the MOSFET, thus cutting off the power supply to the channel.The thermal-shutdown (TSD) block monitors the die temperature and proprietary software will shut down the chip if the temperature exceeds the set temperature.

Conclusion

The MN1381SG PMIC is a powerful power management IC specifically designed for USB Type-C applications such as mobile devices, power adapters, and data charging ports. It offers a complete solution for PD applications, providing ESD, UVLO, OVP, UVP, OCP, and OTP protection. Its two power supply channels independently support both single-input 5V3A and dual-input 5V3A power operating modes, enabling versatile applications. The working principle of the MN1381SG PMIC consists of three main blocks which are responsible for current sensing, over-voltage protection, and thermal shutdown protection, thereby providing a complete protection solution for USB Type-C applications.

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