UPS615/TR13

Product Overview

The Microchip Technology UPS615/TR13 is a high-performance USB power switch designed to provide overcurrent and short-circuit protection for USB-powered devices. It integrates a low-on-resistance N-channel MOSFET switch with precise current limiting and thermal shutdown features. This device is optimized for protecting USB ports and downstream circuitry from damage caused by faults while maintaining high efficiency and low voltage drop to ensure stable power delivery.

The UPS615/TR13 supports USB 2.0 and USB 3.0 applications with fast response times and minimal power loss. It features an adjustable current limit to match various device requirements, and its fault reporting output allows system-level monitoring and control. The package is a small footprint SOT-23-5, ideal for space-constrained portable and embedded designs. The device is supplied in tape and reel format to facilitate automated assembly processes.

Key Features

* Integrated N-channel MOSFET switch with low RDS(on) for high efficiency
* Programmable current limit, typically adjustable from 0.1 A to 3 A
* Fast overcurrent and short-circuit protection with automatic thermal shutdown
* Reverse current blocking to prevent backflow of current when input voltage drops
* Output fault flag (active low) for system fault detection and monitoring
* Low quiescent current for power saving during idle conditions
* Input under-voltage lockout to ensure reliable power switching
* Wide operating voltage range: 4.5 V to 5.5 V, compatible with USB power specifications
* Overtemperature shutdown for enhanced reliability
* Small SOT-23-5 surface-mount package suitable for compact designs
* RoHS compliant and halogen-free
* Tape and reel packaging for automated manufacturing

Electrical Specifications

* Input Voltage Range (VIN): 4.5 V to 5.5 V
* Maximum Continuous Output Current (IOUT): 3 A
* Typical On-Resistance (RDS(on)): 65 mΩ at 3 A and VIN = 5 V
* Current Limit Range: Programmable, typical default around 3 A
* Current Limit Accuracy: ±10% typical
* Response Time to Overcurrent: Less than 10 µs
* Reverse Current Blocking: Yes, prevents current backflow from output to input
* Quiescent Current: Approximately 50 µA during operation
* Input Under-Voltage Lockout Threshold: 3.8 V typical
* Fault Flag Output: Open-drain, active low, signals overcurrent or thermal shutdown events
* Thermal Shutdown Threshold: Approximately 150°C
* Operating Temperature Range: –40°C to +85°C
* Package Thermal Resistance (θJA): Approximately 125°C/W in SOT-23-5 package

Functional Description

The UPS615/TR13 operates as a power distribution switch for USB ports, providing controlled delivery of power to downstream USB devices. It integrates an N-channel MOSFET as a high-side switch, allowing current flow from the power source to the USB port when enabled.

The device continuously monitors the output current through an internal sensing mechanism and limits the current to the programmed threshold. If an overcurrent or short-circuit condition is detected, the device quickly reduces or shuts off current flow to protect the USB port and the attached load. It also includes thermal shutdown to protect against sustained overload conditions.

Reverse current blocking prevents unwanted current flow back from the USB device or downstream circuitry, protecting the host system. The device features an open-drain fault flag output, which signals the system microcontroller or power management unit about fault conditions, enabling appropriate responses such as disabling the port or alerting the user.

The UPS615/TR13 features low quiescent current operation and fast response times, making it well suited for battery-powered or portable applications where efficiency and protection are critical.

Typical Applications

* USB 2.0 and USB 3.0 power port protection
* Portable and battery-powered devices with USB interfaces
* Motherboard and embedded system USB port power control
* Power distribution and management in mobile computing devices
* Consumer electronics requiring hot-swap and overcurrent protection
* Industrial USB hubs and peripherals
* IoT devices with USB charging or data ports

Design Considerations

* Ensure appropriate PCB layout with short, wide traces for power and ground paths to minimize voltage drop and improve thermal dissipation.
* Use proper decoupling capacitors near the device to maintain power stability and reduce noise.
* Select the current limit setting (if programmable) according to the USB device’s maximum current requirements and safety margins.
* Verify that thermal management is adequate for the expected power dissipation, including copper pours and thermal vias as necessary.
* Implement fault flag monitoring in system firmware for timely detection and handling of fault conditions.
* Follow USB power specifications and guidelines to ensure compatibility and safety.
* Consider device enable/disable logic in system design for controlled power sequencing and management.

Summary

The Microchip Technology UPS615/TR13 is a compact, efficient USB power switch that provides essential overcurrent, short-circuit, and thermal protection for USB-powered devices. Its programmable current limit, fast response, and integrated fault signaling support robust and reliable USB port operation in a variety of consumer, industrial, and embedded applications. The device’s low on-resistance and low quiescent current contribute to efficient power delivery, making it an excellent choice for modern USB power management challenges.