Events
2025.12.10
MT7932 High Voltage, High Current Bidirectional Load Switch with I2C Interface for USB PD Application
Abstract
As USB Type-C with Power Delivery (PD) becomes the universal interface for high-power (up to 240W) and high-data-rate applications, system designers face critical challenges: managing dynamic and wide range of power contracts, preventing fault propagation, and minimizing solution footprint.
The MT7932 is a high-voltage high-current bidirectional load switch developed by M3TEK for USB Type-C PD applications. This IC features high voltage and current rating at 33V and 5A with integrated ultra-low Rdson power devices， bidirectional power flow, ideal diode true reverse blocking, and I2C digital interface. MT7932 provides comprehensive protection functions including Input voltage surge protection; Input current surge protection; Output constant-current control; Output short-circuit protection; Thermal shutdown protection. Additionally, the I2C interface of the device enables digital control over: Power flow direction control; Fast role swap; Input overvoltage threshold; Output current limit level; Soft-start time; Undervoltage threshold and Discharge time. MT7932 achieves high efficiency, compact footprint, minimal external components, and delivers robust yet flexible protection capabilities.
1. Introduction
USB Type C connectors are evolving into universal connectivity for modern platforms and devices. With smaller, thinner and lighter form factors, faster data transfer speed and high-power delivery capabilities, USB Type C with USB PD helps address many power-hungry applications. With wide range of devices using USB Type C, the capabilities of a USB PD Source and a USB Type C sink varies widely, from default USB Type C 15W (5V/3A) to 240W (48V/5A) in new USB PD 3.1 standard with Extended Power Range. The system could be more complicated with dual role power sources like a notebook computer.
With smaller size, higher voltage, higher power, more complex power flow and wide range of power sources and sinks, systems are calling for a load switch with high efficiency, smaller footprint and other new features, especially flexibility to adjust many protection thresholds on the fly.
The MT7932 is a high-voltage high-current bidirectional load switch developed by M3TEK to meet the need for USB Type-C PD 3.1 applications.
2. MT7932 Description and Application
Figure 1 shows the block diagram and typical application of MT7932.
