company blog about TI TPS259573DSGR 34mΩ eFuse With Fast Overvoltage Protection

TI TPS259573DSGR 34mΩ eFuse With Fast Overvoltage Protection

Shenzhen Mingjiada Electronics Co., Ltd., as a globally renowned authorised independent distributor of electronic components, has been supplying TI's high-performance electronic fuse (eFuse) product TPS259573DSGR for an extended period. This electronic fuse, housed in a compact WSON-8 package, integrates advanced features such as overvoltage protection, adjustable current limiting, and output conversion rate control, providing reliable circuit protection and power management solutions for modern electronic systems.

TPS259573DSGR Product Overview

The TPS259573DSGR is part of TI's TPS2595xx series of electronic fuses, an integrated FET hot-swap device that provides highly integrated circuit protection and power management functions in a compact package. The TPS259573DSGR device features a wide input voltage range of 2.7V to 18V, an absolute maximum voltage withstand capability of 20V, and a low on-resistance of just 34mΩ (typical), effectively reducing power loss.

This TPS259573DSGR electronic fuse is specifically designed for applications requiring precise current control and fast protection response, offering multiple protection modes with minimal external components, and effectively safeguarding against overloads, short circuits, voltage surges, and excessive surge currents. Its operating temperature range is -40°C to +125°C, making it suitable for applications in various harsh environments.

Specification Of TPS259573DSGR

Current Limit: 500 mA to 4 A

Supply Voltage - Max: 18 V

Supply Voltage - Min: 2.7 V

Number of Channels: 1 Channel

Minimum Operating Temperature: - 40 ℃

Maximum Operating Temperature: + 125 ℃

Mounting Style: SMD/SMT

Package / Case: WSON-8

Input / Supply Voltage - Max: 18 V

Input / Supply Voltage - Min: 2.7 V

Product Type: Hot Swap Voltage Controllers

Core Technologies and Functional Features:

1. Rapid Overvoltage Protection Mechanism

The overvoltage protection (OVP) function of the TPS259573DSGR is one of its most prominent technical features. The TPS259573DSGR device incorporates a fast overvoltage protection clamping circuit, offering three fixed clamping voltage options of 3.8V, 5.7V, and 13.7V, with a response time of just 5µs (typical), enabling rapid limitation of the output voltage to a safe range without requiring external components.

This fast response characteristic is particularly suitable for protecting downstream sensitive circuits from voltage transients or power supply failures. The TPS259573DSGR device also provides a low-level active enable input with adjustable overvoltage lockout (OVLO), further enhancing the system's overvoltage protection capabilities.

2. Precise adjustable current limiting

The TPS259573DSGR offers an adjustable current limit range from 0.5A to 4A with a precision of ±7.5%. The current limit level can be set using a single external resistor, allowing designers to flexibly configure protection thresholds according to specific application requirements.

The TPS259573DSGR device also features a load current monitor output (ILM), which accurately senses the output load current by measuring the voltage drop across the entire current limit resistor. This feature enables the system to monitor current status in real time, providing data support for fault diagnosis and preventive maintenance.

3. Output Conversion Rate Control and Thermal Protection

For applications with specific surge current requirements, the TPS259573DSGR can set the output conversion rate (dV/dt) using a single external capacitor, effectively controlling surge current during power-up and preventing system failures caused by excessive current surges.

The TPS259573DSGR device also integrates over-temperature protection (OTP) functionality, automatically disconnecting the circuit when temperature exceeds safe thresholds to prevent thermal runaway from damaging the device or surrounding components. The fault indicator pin (FLT) promptly reports the protection status to the system controller, facilitating rapid issue identification and resolution.

Application Areas:

1. Hot-Swap and Power Management

The TPS259573DSGR is particularly suitable for hot-swap applications such as server backplanes, storage devices, and network switches. In these applications, the electronic fuse prevents surge currents and voltage transients generated during hot-swap operations from damaging the equipment.

In adapter power supply systems, the TPS259573DSGR provides input overvoltage protection and output current limiting, ensuring safe operation under abnormal power conditions. Its wide input voltage range (2.7V to 18V) makes it suitable for a variety of power adapter specifications.

2. Data Storage and Industrial Systems

For solid-state drives (SSDs) and hard disk drives (HDDs), the TPS259573DSGR provides precise current limiting and fast overvoltage protection to prevent data loss or storage medium damage caused by power abnormalities.

In industrial control systems, the TPS259573DSGR's wide temperature range (-40°C to +125°C) and robust protection features enable it to withstand harsh industrial environments, providing reliable power protection for PLCs, industrial PCs, and automated equipment.

3. Consumer Electronics and Home Appliances

The TPS259573DSGR is also widely used in consumer electronics, such as:

Set-top boxes and digital televisions: Protecting the main control chip from power fluctuations

Multifunction printers: Managing the safe power-on sequence of multiple power domains

White goods: Providing stable power protection for microcontrollers and sensors