Mp3378e | Protection Pin Upd
: The MP3378E includes an internal temperature sensor. If the junction temperature of the IC exceeds its safe operating limit (typically around +150°C), the device initiates a shutdown to cool down. Once the temperature drops to a safe level, the controller automatically restarts, a feature known as recoverable thermal shutdown , which prevents permanent damage from overheating.
The device includes recoverable thermal protection. If the junction temperature exceeds its safety threshold, the IC shuts down and resumes operation once it cools. The "Protection Pin" Logic (UPD)
Disconnect the LED+ and LED- cables from the driver board. Replace with a dummy load (e.g., 1kΩ resistor from SW to GND and a 47kΩ from VOUT to GND). This removes actual LEDs from the equation.
During normal operation, the IC monitors the voltage feedback flowing into Pin 9. mp3378e protection pin upd
Are you currently troubleshooting a issue or designing a new PCB layout for this chip? MP3378E - Monolithic Power Systems
input, which is a critical feedback node used to monitor and protect the IC from fault conditions. Protection Pin Overview (OVP)
The MP3378E uses a resistor divider from VOUT (boost output) to the PROT pin. If the divider is incorrectly calculated or damaged: : The MP3378E includes an internal temperature sensor
Both stages are monitored by a combined array of protective sensors. The IC tracks parameters across multiple pins to trigger a shutdown if conditions become unsafe: (Over-Current Protection) OVP (Over-Voltage Protection) UVP (Under-Voltage Protection) OTP (Over-Temperature / Thermal Shutdown) LED Short/Open Protection Inductor/Diode Short Protection 2. Key Pins Related to Fault Protection
: For specific pins that reference internal logic thresholds, placing a precise, highly stable 10kΩ resistor (1% tolerance) between the diagnostic reference terminal and ground grounds out floating interference.
Solder a parallel resistor or adjust the low-side resistor to ground to force the OVP pin voltage below its trip threshold. The device includes recoverable thermal protection
: Over-Voltage Protection input. It samples output boost voltage via a resistor divider.
The MP3378E is a synchronous buck converter integrated circuit designed for high-efficiency voltage regulation in portable and battery-powered applications. A key feature that contributes to its robustness and reliability is the protection circuitry associated with its PROT (protection) pin. This essay explains the role, behavior, implementation details, interaction with other protection features, typical usage patterns, and design considerations for the PROT pin on the MP3378E.
The protection features are not just abstract concepts; they are tied to specific pins that require careful consideration during design and debugging.