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TI TPS2420RSAR Highly Integrated FET Hot-Swap Controller

Shenzhen Mingjiada Electronics Co., Ltd., as a leading global authorised independent distributor of electronic components, has been supplying the TI TPS2420RSAR, a highly integrated FET hot-swap controller, for an extended period.

TPS2420RSAR Product Overview and Technical Features

The TPS2420RSAR is a high-performance hot-swap controller designed to manage power insertion and removal transients in electronic systems. The device employs advanced integration technology to combine multiple functions into a compact package, providing system designers with a compact and efficient power management solution.

The TPS2420RSAR provides highly integrated load protection for applications up to 20 V. With a maximum UV turn-on threshold of 2.9 V, the TPS2420RSAR is suitable for standard bus voltages as low as 3.3 V. The device protects the load, minimises inrush current, and ensures safe shutdown in the event of a fault. The programmable fault current threshold allows current to flow unimpeded to the load while initiating the fault timer. The programmable current limit threshold sets the maximum current allowed to flow to the load, suitable for inrush current and severe load faults. Both scenarios use a programmable timer, which cuts off all current to the load once the timer expires.

Dual protection thresholds are particularly useful in applications such as hard disk drives. Startup and seek currents typically exceed the rated current, requiring the load to have a low-impedance path for power transmission. If a load fault occurs, current limiting prevents the current from exceeding the programmed threshold. This protects both the load and the integrity of the power supply. The internal MOSFET is protected by a power limit circuit, ensuring that the MOSFET remains within the safe operating area (SOA) under all operating conditions.

The TPS2420RSAR device allows the system to monitor load current without adding a shunt resistor in the power path. The gain of the current monitor can be adjusted according to application requirements. Fault and normal power output conditions enhance system management and sequence control performance.

The TPS2420RSAR device can be configured to lockout or retry mode in the event of a fault. All these features are integrated into a 16-pin 4 × 4 mm QFN package.

Key performance parameters:

Input voltage range: 2.9V to 18V, covering a wide range of application scenarios

Programmable current limit: Provides precise overcurrent protection via external resistor settings

Fast response time: Detects and responds to fault conditions within microseconds

Integrated MOSFET driver: Simplifies external circuit design and reduces component count

Thermal protection: Prevents device damage under over-temperature conditions

SOIC-16 package: Saves board space and is suitable for high-density PCB designs

Functional Advantages:

Surge current control: The TPS2420RSAR effectively limits surge current during hot-swap operations by controlling the turn-on rate of the external MOSFET, preventing voltage drops and system resets.

Fault protection: The TPS2420RSAR provides overcurrent, short-circuit, and over-temperature protection. When a fault is detected, it quickly disconnects the load to protect the system from damage.

Status Indication: The TPS2420RSAR provides fault status indication via an open-drain output pin, facilitating system monitoring and diagnosis.

Adjustable Start-up Time: The TPS2420RSAR allows designers to optimise start-up characteristics according to specific application requirements.

These features make the TPS2420RSAR an ideal choice for systems requiring hot-swap functionality, such as servers, network equipment, storage systems, and industrial control devices.

Typical application scenarios for the TPS2420RSAR

1. Servers and storage systems

In modern data centres, hot-swap capability is a basic requirement for servers and storage systems. The TPS2420RSAR can be used for:

Hard disk backplanes: Managing hot-swap operations for multiple hard disk drives

Power distribution units: Controlling the connection and removal of multiple power sources

PCIe card slots: Supporting hot-swap functionality for PCIe devices

In these applications, the TPS2420RSAR ensures that system power fluctuations do not occur during device insertion or removal while providing necessary protection functions.

2. Network communication equipment

Network switches, routers, and base station equipment typically require high-reliability power management. The TPS2420RSAR plays a crucial role in these devices:

Line card power management: Controlling power connection for each line card

Modular devices: Supports hot-swappable replacement of functional modules

Redundant power systems: Manages the switching process between primary and backup power sources

The TPS2420RSAR's fast response characteristics make it particularly suitable for communication devices with extremely high system availability requirements.

3. Industrial control systems

Industrial environments impose stringent requirements on the reliability and durability of electronic devices. The TPS2420RSAR is suitable for:

PLC modules: Manages hot-swappable I/O modules

Industrial computers: Controlling power access for peripheral devices

Fieldbus devices: Supporting online replacement of field devices

The TPS2420RSAR device's wide operating temperature range and robust protection features enable it to withstand harsh industrial environments.

4. Medical electronic devices

Medical devices have strict requirements for power stability and safety. The TPS2420RSAR can be used for:

Modular medical devices: Supporting hot-swappable functional modules

Patient monitoring systems: Managing power supply for various sensors

Portable medical devices: Providing protection for battery-powered systems

The TPS2420RSAR's precise current limiting functionality is particularly suitable for applications where patient safety is a priority.