Texas Instruments TPS2124YFPR

Overview

TPS2124YFPR from Texas Instruments is a dual-input, single-output (DISO) priority power multiplexer IC designed for seamless switchover between two independent DC power sources in systems requiring uninterrupted supply. It operates from 2.8 V to 22 V, delivers up to 2.5 A output current with 62 mΩ typical R_ON, features adjustable overvoltage and priority supervisors (<±5% accuracy), and integrates fast reverse current blocking (10 µs response) and thermal shutdown (160°C). It is used in EPOS terminals and telematics units where battery backup must engage without voltage dip or hold-up capacitance dependency.

For engineers reviewing the TPS2124YFPR datasheet, TPS2124YFPR pinout, TPS2124YFPR application, or TPS2124YFPR equivalent, key selection criteria include input voltage range compatibility (2.8–22 V), programmable current limit (1–2.5 A via R_ILM), WCSP-20 package footprint constraints (1.5 mm × 2.0 mm), and support for both automatic highest-voltage selection and manual GPIO-controlled source override via SEL/PR1 pins.

Technical Context

The TPS2124YFPR implements ideal diode behavior using internal N-channel MOSFETs to eliminate reverse current and enable sub-100 µs switchover with controlled voltage drop. Its priority logic supports two modes: automatic selection based on V_COMP comparator (with 280 mV typical offset and 3.5% hysteresis) or manual assignment via PR1/SEL control pins referenced to 1.06 V internal V_REF.

It integrates active current limiting (adjustable 0.5–3 A), fast-trip OCP (2.4× I_LM, <1 µs response), and dual-stage thermal protection (absolute shutdown at 160°C and relative FET-localized shutdown). All supervisory thresholds-OV1/OV2, PR1, SEL-are referenced to the same precision 1.06 V bandgap reference with ±5% tolerance across –40°C to 125°C.

Key Specifications

Pinout & Package

TPS2124YFPR is housed in a 20-pin Wafer Chip Scale Package (WCSP) with 1.5 mm × 2.0 mm body size and 0.4 mm pitch, optimized for space-constrained portable and industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar priority power mux applications.

Compared with TPS2124YFPR, TPS2113APW offers lower cost but sacrifices dual-input intelligence and voltage range, while RTQ2132B-QA provides automotive reliability and lower conduction loss at the expense of analog configurability and soft-start tuning.

Availability

TPS2124YFPR is available at Aetrix Electronics and suitable for EPOS terminals, telematics modules, and building automation sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS2124YFPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing.

The TPS2124YFPR belongs to TI's priority power mux product line, engineered specifically for systems demanding seamless, intelligent source selection between two independent DC supplies in space- and reliability-critical applications.

FAQ

What is the maximum input voltage the TPS2124YFPR can withstand?

The TPS2124YFPR has an absolute maximum input voltage rating of 24 V on IN1 and IN2 pins. Its recommended operating range is 2.8 V to 22 V. Exceeding 24 V risks permanent damage, even momentarily. The device includes overvoltage protection on both inputs (OV1/OV2), which can be configured to shut down the respective channel before reaching this limit - for example, setting OV1 to 23 V using an external resistor divider ensures safe operation under transient surges while staying within specification.

How does the TPS2124YFPR achieve seamless switchover without output voltage dip?

The TPS2124YFPR achieves seamless switchover using ideal diode control architecture with fast gate drivers and reverse current blocking. During transition, it actively controls the voltage drop across the internal FETs to prevent reverse current flow before it begins, maintaining continuous power delivery. With a typical switchover time of 100 µs and fast reverse current blocking response of 10 µs, the TPS2124YFPR sustains output regulation without requiring large hold-up capacitors - a key advantage over mechanical or discrete diode-based solutions.

Can the TPS2124YFPR be used with input voltages below 2.8 V?

No, the TPS2124YFPR is not specified to operate below 2.8 V. Its undervoltage lockout (UVLO) activates at 2.55 V (typical falling threshold), disabling both channels if either input drops below this level. Attempting to use it at, for example, 2.5 V will result in unpredictable behavior or complete shutdown. For sub-2.8 V applications, alternative devices such as the TPS2113A (2.7 V min) or discrete ideal diode controllers with lower V_GS thresholds should be evaluated.

What is the function of the ST pin on the TPS2124YFPR?

ST is an open-drain status output pin on the TPS2124YFPR that indicates the currently selected input source: it pulls low when IN2 is powering the output, and remains high when IN1 is active or when the output is in Hi-Z state (both inputs invalid). It requires an external pull-up resistor (6–20 kΩ recommended) to a compatible logic voltage. This pin enables real-time monitoring of source selection without software polling - essential for diagnostics in EPOS or telematics systems where source failure must be logged immediately.

How is the output current limit set on the TPS2124YFPR?

The output current limit on the TPS2124YFPR is set by connecting an external resistor (R_ILM) between the ILIM pin and GND. The relationship is inverse: lower resistance yields higher current limit. For example, 85 kΩ sets ~1.5 A, 46.4 kΩ sets ~2.5 A, and 137 kΩ sets ~1 A. The device uses this resistor to program a precise trip point with ±15% tolerance across temperature, enabling tailored protection for specific load profiles - such as limiting inrush during cold start in a building sensor node while allowing full 2 A during normal operation.