Product details


FET Internal Ron (Typ) (mOhm) 30 Vin (Min) (V) 3 Vin (Max) (V) 20 Vabsmax_cont (V) 25 Current limit (Min) (A) 1 Current limit (Max) (A) 5 Overcurrent response Current limiting, Circuit breaker Fault response Auto Retry, Latch Off UL recognition UL2367 open-in-new Find other eFuses & hot swap controllers

Package | Pins | Size

VQFN (RSA) 16 16 mm² 4 x 4 open-in-new Find other eFuses & hot swap controllers


  • Integrated 30-mΩ Pass MOSFET
  • Up to 20-V Bus Operation
  • Programmable Fault Current
  • Programmable Hard Current-Limit
  • Programmable Fault Timer
  • Internal MOSFET Power Limiting Foldback
  • Latching and Auto-Retry Operation
  • Analog Current Monitor Output
  • Powergood Output
  • Fault Output Indicator
  • 4 mm × 4 mm QFN
  • –40°C to 125°C Junction
    Temperature Range
  • UL2367 Recognized - File Number E169910
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The TPS2420 device provides highly integrated load protection for applications up to 20-V. The maximum UV turn-on threshold of 2.9 V makes the TPS2420 well suited to standard bus voltages as low as 3.3 V. The TPS2420 device protects loads, minimizes inrush current, and safely shuts down in the event of a fault. The programmable fault current threshold starts the fault timer while allowing the current to pass to the load uninhibited. The programmable current limit threshold sets the maximum current allowed into the load, for both inrush and severe load faults. Both events use the programmable timer which inhibits all current to the load when it expires.

The dual protection thresholds are useful in applications such as disk drives. The start-up and seek currents are typically higher than the nominal current and during this time the load needs a low impedance path to deliver the power. If a failure at the load occurs, the current limit does not allow the current to exceed the programmed threshold. This protects both the load and the integrity of the power supply. The internal MOSFET is protected by power limit circuitry which ensures that the MOSFET remains within its safe operating area (SOA) during all operating states.

The TPS2420 device also allows the system to monitor load currents with no need for a shunt in the power path. The gain of the current monitor can be scaled to the application. Fault and power good outputs are provided for improved system management and sequencing control.

This device can be programmed to either latch-off or retry in the event of a fault. All of this functionality is packed into a 16-pin 4 × 4 mm QFN package.

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Technical documentation

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Type Title Date
* Data sheet TPS2420 5-A, 20-V Integrated FET Hot-Swap Controller datasheet (Rev. F) Jan. 29, 2014
Certificate TPS2420 UL Certificate of Compliance IEC 60950-1 Apr. 10, 2020
Application note eFuse: Safety Certification and why it Matters Mar. 18, 2020
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Basics of eFuses (Rev. A) Apr. 05, 2018
Application note Power Multiplexing Using Load Switches and eFuses (Rev. A) Jun. 20, 2017
Technical article Adapters gone wild! Jan. 21, 2014
User guide TPS2420 Reference Design Mar. 27, 2009
User guide Using the TPS2420, TPS2421-1, TPS2421-2 Jan. 06, 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The TPS2420EVM-01 is a 3-V to 18-V module using the TPS2420 hot swap controller with integrated MOSFET. At power on, the output is power limited to control inrush current and protect the MOSFET. On an over-current condition, the controller interrupts power to the load at high speed and signals load (...)

  • 3V to 18V Operation
  • Controlled Inrush Current
  • Fast Circuit Breaker Control
  • Hardware Programmable
  • LED status display
  • A Slide Switch Controls the ENABLE Signal
  • The Area Under the TPS2420 is Copper Pour with Vias to the Internal Ground to take Advantage of the Power Pad Package
  • A Transorb is On-Board for (...)

Design tools & simulation

SLUM497A.ZIP (73 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

Reference Design for Telecom Applications (.9V @ .5A)
PMP4742 PMP4742.1 comprises a negative input (-10.8V to -13.2V) to positive output (12V@1A average) inverting buck-boost converter with TPS40210; a hot swap circuit with TPS2420 quickly limits the output current to 2A peak.
Design files

CAD/CAE symbols

Package Pins Download
QFN (RSA) 16 View options

Ordering & quality

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