Design tool
PMUX-SWITCHOVER-CALC — Calculate fast switchover parameters for power mux devices
Calculate fast switchover parameters for power mux devices
Data sheet
TPS2121
- 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.
Technical documentation
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View all 5 | 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
For additional terms or required resources, click any title below to view the detail page where available.
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
Simulation model
TPS2121 Unencrypted PSpice Transient Model Package (Rev. A)
SLVMCO8A.ZIP (133 KB) - PSpice Model
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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This reference design is optimized for 10 to 100 Mbps using the low-power Ethernet physical layer (PHY) DP83825 supporting 150-m reach over CAT5e cable which is beyond the standard Ethernet distance limitation of 100 m (328 feet). This design has power delivery over Ethernet cable along with data (...)
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Test report: PDF
Reference designs
TIDA-010070 — Protected DC-bus input power and control power supply reference design for low-voltage servo drives
This reference design uses an ORing controller, the LM5050-1 to provide protection against reverse polarity and reverse current. In conjunction, the LM5069 hot swap controller is used for overcurrent, over voltage, under voltage protection, and inrush current limitation. The design also features (...)
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Reference designs
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Reference designs
TIDA-01638 — Seamless switchover for backup power reference design
The TIDA-01638 referencedesign showcases Power MUXing with redundant power. If one power source fails, the system needs to switchover to a backup power source and provide an uninterrupted source of power to downstream loads. Therefore, power redundancy ensures that if one power supply were to fail, (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN-HR (RUX) | 12 | Ultra Librarian |
Ordering & quality
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Information included:
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