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TPS2121

ACTIVE

2.7-V to 22-V, 56-mΩ, 4.5-A, power mux with seamless switchover

Product details

Number of input channels 2 IN1, IN2 input voltage (min) (V) 2.7 IN1, IN2 input voltage (max) (V) 20 IN1 rDS(on) (typ) (mΩ) 56 IN2 rDS(on) (typ) (mΩ) 56 IN1 output current (max) (A) 4 IN2 output current (max) (A) 4 Rating Catalog Quiescent current (Iq) (µA) 300 Operating temperature range (°C) -40 to 125 FET Internal Imax (A) 4.5 Features Adjustable current limit, Inrush current control, Overvoltage protection, Power good, Reverse current blocking, Short circuit protection, Thermal shutdown Device type Power muxes Function Adjustable current limit, Overvoltage protection, Power good signal, Reverse current blocking, Thermal shutdown
Number of input channels 2 IN1, IN2 input voltage (min) (V) 2.7 IN1, IN2 input voltage (max) (V) 20 IN1 rDS(on) (typ) (mΩ) 56 IN2 rDS(on) (typ) (mΩ) 56 IN1 output current (max) (A) 4 IN2 output current (max) (A) 4 Rating Catalog Quiescent current (Iq) (µA) 300 Operating temperature range (°C) -40 to 125 FET Internal Imax (A) 4.5 Features Adjustable current limit, Inrush current control, Overvoltage protection, Power good, Reverse current blocking, Short circuit protection, Thermal shutdown Device type Power muxes Function Adjustable current limit, Overvoltage protection, Power good signal, Reverse current blocking, Thermal shutdown
VQFN-HR (RUX) 12 5 mm² 2.5 x 2
  • Wide operating range: 2.8 V to 22 V
    • Absolute maximum input voltage of 24 V
  • Low RON resistance:
    • TPS2120: 62 mΩ (typical)
    • TPS2121: 56 mΩ (typical)
  • Adjustable overvoltage supervisor (OVx):
    • Accuracy < ±5%
  • Adjustable priority supervisor (PR1):
    • Accuracy < ±5%
  • TPS2121 Supports external voltage reference (CP2) with an accuracy of <1%
  • Output current limit (ILM):
    • TPS2120: 1 A – 3 A
    • TPS2121: 1 A – 4.5 A
  • Channel status indication (ST)
  • Adjustable input settling time (SS)
  • Adjustable output soft start time (SS)
  • TPS2121 Fast output switchover (tSW): 5 µs (typical)
  • Low Iq from enabled input: 200 µA (typical)
  • Low Iq from disabled input: 10 µA (Typical)
  • Manual input source selection (OVx)
  • Over temperature protection (OTP)
  • Wide operating range: 2.8 V to 22 V
    • Absolute maximum input voltage of 24 V
  • Low RON resistance:
    • TPS2120: 62 mΩ (typical)
    • TPS2121: 56 mΩ (typical)
  • Adjustable overvoltage supervisor (OVx):
    • Accuracy < ±5%
  • Adjustable priority supervisor (PR1):
    • Accuracy < ±5%
  • TPS2121 Supports external voltage reference (CP2) with an accuracy of <1%
  • Output current limit (ILM):
    • TPS2120: 1 A – 3 A
    • TPS2121: 1 A – 4.5 A
  • Channel status indication (ST)
  • Adjustable input settling time (SS)
  • Adjustable output soft start time (SS)
  • TPS2121 Fast output switchover (tSW): 5 µs (typical)
  • Low Iq from enabled input: 200 µA (typical)
  • Low Iq from disabled input: 10 µA (Typical)
  • Manual input source selection (OVx)
  • Over temperature protection (OTP)

The TPS212x devices are Dual-Input, Single-Output (DISO) Power Multiplexer (MUX) that are well suited for a variety of systems having multiple power sources.  The devices will Automatically Detect, Select, and Seamlessly Transition between available inputs.

 Priority can be automatically given to the highest input voltage or manually assigned to a lower voltage input to support both ORing and Source Selection operations. A priority voltage supervisor is used to select an input source.

 An Ideal Diode operation is used to seamlessly transition between input sources.  During switchover, the voltage drop is controlled to block reverse current before it happens and provide uninterrupted power to the load with minimal hold-up capacitance.

Current limiting is used during startup and switchover to protect against overcurrent events, and also protects the device during normal operation.  The output current limit can be adjusted with a single external resistor.  

 The TPS212x devices are available in WCSP and small VQFN-HR package options characterized for operation for a temperature range of –40°C to 125°C.

The TPS212x devices are Dual-Input, Single-Output (DISO) Power Multiplexer (MUX) that are well suited for a variety of systems having multiple power sources.  The devices will Automatically Detect, Select, and Seamlessly Transition between available inputs.

 Priority can be automatically given to the highest input voltage or manually assigned to a lower voltage input to support both ORing and Source Selection operations. A priority voltage supervisor is used to select an input source.

 An Ideal Diode operation is used to seamlessly transition between input sources.  During switchover, the voltage drop is controlled to block reverse current before it happens and provide uninterrupted power to the load with minimal hold-up capacitance.

Current limiting is used during startup and switchover to protect against overcurrent events, and also protects the device during normal operation.  The output current limit can be adjusted with a single external resistor.  

 The TPS212x devices are available in WCSP and small VQFN-HR package options characterized for operation for a temperature range of –40°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet TPS212x 2.8-V to 22-V Priority Power MUX with Seamless Switchover datasheet (Rev. F) 28 Aug 2020
Application note Design Example to Implement Automatic Switchover for Backup Power Using TPS2121 PDF | HTML 24 Feb 2023
Application note Basics of Power MUX (Rev. A) PDF | HTML 20 Oct 2020
E-book 11 Ways to Protect Your Power Path 03 Jul 2019
EVM User's guide TPS212x Evaluation Module User's Guide (Rev. A) 15 Jan 2019

Design & development

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Evaluation board

TPS2121EVM-023 — TPS2121 Evaluation Module for Priority Power Multiplexer Applications

The TPS212x EVM is an evaluation module for TI's TPS212x family of two-input, one-output power multiplexers. This device automatically detects, selects, and seamlessly transitions between two power supplies, each operating from 2.7 V to 22 V. The TPS2121 device, the VSON hot-rod package, can (...)

User guide: PDF
Not available on TI.com
Simulation model

TPS2121 Unencrypted PSpice Transient Model Package (Rev. A)

SLVMCO8A.ZIP (133 KB) - PSpice Model
Design tool

PMUX-SWITCHOVER-CALC Calculate fast switchover parameters for power mux devices

Calculate fast switchover parameters for power mux devices
Supported products & hardware

Supported products & hardware

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Hardware development
Evaluation board
TPS2117EVM TPS2117 evaluation module for the 5.5-V, 4.5-A power mux with low IQ TPS2121EVM-023 TPS2121 Evaluation Module for Priority Power Multiplexer Applications TPS2116EVM TPS2116 low iq power mux with manual and automatic switchover evaluation module
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Reference designs

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Package Pins Download
VQFN-HR (RUX) 12 View options

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