Welcome Here  Shenzhen Mingjiada Electronics Co., Ltd.

TI TPS25921ADR 1.7A Electronic Fuse IC With Auto Retry Fault Response

In today's increasingly complex electronic devices and growing demands for power management, reliable circuit protection has become a critical component of system design. Shenzhen Mingjiada Electronics Co., Ltd., as a leading domestic supplier of electronic components, has specially introduced TI's TPS25921ADR electronic fuse IC. This intelligent protection device, featuring automatic retry fault response functionality, provides efficient and precise power management solutions for various electronic systems.

Product Overview: Core Value of the TPS25921ADR Electronic Fuse IC

The TPS25921ADR is a multi-functional electronic fuse belonging to TI's advanced load switch and circuit protection product line. Designed for applications requiring precise current limiting and comprehensive system protection, it represents the pinnacle of modern electronic fuse technology. Compared to traditional fuse-based fuses, the TPS25921ADR offers smarter, more flexible protection mechanisms that can automatically resume operation without component replacement, significantly enhancing system reliability and maintenance convenience.

As a compact electronic fuse solution, the TPS25921ADR is housed in an SOIC-8 package, integrating a wealth of protection features within a minimal board space footprint. Its operating voltage range spans from 4.5V to 18V, with an absolute value of up to 20V, enabling it to adapt to various DC bus environments. The device integrates a MOSFET with a typical on-resistance of just 90mΩ, providing an efficient power path while minimising power loss.

Automatic retry fault response is one of the TPS25921ADR's most notable features. When fault conditions such as overcurrent or overheating are detected, the device first enters a protective state to cut off the current, then automatically attempts to restore power after a pre-set time. This mechanism is particularly suitable for unattended or hard-to-access devices, such as smart home products, industrial control systems, and network equipment, ensuring the system can automatically resume normal operation after a brief fault without manual intervention.

Technical Features and Performance Parameters: The Art of Precise Protection

The TPS25921ADR electronic fuse IC stands out among its peers thanks to its exceptional technical specifications and precise protection mechanisms. Understanding these technical features is crucial for engineers to select and apply the device correctly.

A wide voltage operating range is a key feature of the TPS25921ADR. The device supports an input voltage range of 4.5V to 18V, with an absolute value of up to 20V, enabling it to adapt to various power supply environments, from low-voltage USB-powered devices to high-voltage industrial control systems. This wide voltage compatibility significantly simplifies power architecture planning for designers and reduces the need for additional conversion circuits due to different voltage levels.

In terms of current limit accuracy, the TPS25921ADR excels. The device offers an adjustable current limit range from 0.4A to 1.6A. When ILIMIT is set to 1A and at an ambient temperature of 25°C, its current limit accuracy reaches an impressive ±2%. This high-precision feature makes the TPS25921ADR an ideal choice for current-sensitive applications such as precision instruments, medical devices, and high-end consumer electronics. Designers can flexibly set the desired current threshold via an external resistor to meet the protection requirements of different loads.

The TPS25921ADR has a low on-resistance of just 90mΩ (typical), meaning that voltage drops and power losses during normal operation are minimal, helping to improve overall system efficiency. For battery-powered devices, this high efficiency extends runtime and enhances user experience.

In terms of voltage protection, the device integrates overvoltage protection (OVP) and undervoltage lockout (UVLO) functions, with threshold accuracy of ±3%. These protection mechanisms ensure strict control of bus voltage without requiring additional monitoring circuits, preventing system damage caused by power abnormalities. When the input voltage falls below the undervoltage threshold or exceeds the overvoltage threshold, the device quickly cuts off the output to protect downstream circuits.

Thermal management is a critical consideration for electronic fuses. The TPS25921ADR features comprehensive thermal shutdown protection, automatically disconnecting the circuit when the junction temperature exceeds the safe range. The device operates within a junction temperature range of -40°C to 125°C, making it suitable for harsh environmental applications. After thermal shutdown, the device can enter either an automatic retry or lockout mode based on configuration, providing flexibility for different application scenarios.

The TPS25921ADR also supports programmable dVO/dt control, allowing the output slope rate to be set via a capacitor at the soft-start (SS) pin. This feature is particularly important for hot-swap applications, effectively suppressing inrush current and preventing voltage drops or system resets caused by sudden load connection.

Application Scenarios: Diversified Solutions with the TPS25921ADR

The TPS25921ADR electronic fuse IC demonstrates broad application potential across various fields due to its comprehensive protection features and flexible configuration options.

The home appliance sector is one of the primary application scenarios for the TPS25921ADR. In modern large home appliances such as washing machines, refrigerators, and air conditioners, electronic control systems are becoming increasingly complex, and the reliability requirements for power management are also rising. The TPS25921ADR provides precise overcurrent protection for the control boards of these devices, preventing system damage caused by faults such as motor stalls or sensor short circuits. Its automatic retry function is particularly suitable for home environments. Once the transient overload condition disappears, the device can automatically resume operation without requiring manual reset by the user, significantly enhancing usability.

In the consumer electronics sector, the TPS25921ADR is widely used in devices such as set-top boxes, digital video disc (DVD) players, and gaming consoles. These products typically require simultaneous management of multiple power domains to supply power to different modules such as processors, memory, and peripheral interfaces. The TPS25921ADR can serve as an intelligent protection switch for each power path, ensuring that local faults do not affect the entire system. Additionally, its programmable soft-start feature effectively controls the power-up sequence, preventing current surges caused by multiple modules powering up simultaneously.

Data storage devices such as hard disk drives (HDDs) and solid-state drives (SSDs) are also ideal application scenarios for the TPS25921ADR. These devices are highly sensitive to power quality, and sudden current surges can cause data loss or even physical damage. The TPS25921ADR provides precise current limiting and rapid fault response to protect expensive storage media and controller chips. In hot-swap scenarios, its dVO/dt control function smoothly establishes power connections, reducing connector sparks and signal interference.

The smart metering and industrial sensor sectors also benefit from the high-performance protection offered by the TPS25921ADR. Devices such as gas analysers, water meters, and electricity meters are often deployed in hard-to-reach locations, requiring extremely high reliability and self-recovery capabilities. The TPS25921ADR's automatic retry mechanism ensures these devices can automatically resume normal operation after experiencing brief power anomalies, reducing maintenance requirements. Its wide operating temperature range (-40°C to 125°C) enables it to withstand various harsh environmental conditions.

In USB power management applications, the TPS25921ADR can serve as an efficient USB switch, providing overcurrent protection for downstream ports. As USB power delivery capabilities increase (Type-C interfaces support up to 100W power), port protection becomes even more critical. The TPS25921ADR's adjustable current limit feature allows designers to precisely set protection thresholds according to USB specifications (e.g., 500mA for USB 2.0 or 900mA for USB 3.0), ensuring compliance with standards while providing reliable fault protection.

Power adapters and chargers are another important application area. The TPS25921ADR can be used for protection on either the primary or secondary side to prevent device damage caused by output short circuits or overloads. Its compact SOIC-8 package is particularly suitable for space-constrained adapter designs, helping engineers optimise product size while meeting safety requirements.