TPS2115APWR

Overview

The TPS2115APWR is an autoswitching power multiplexer manufactured by Texas Instruments, designed for efficient power distribution in portable electronics. It features a single output sourced from two selectable inputs within a compact 8-pin TSSOP package. The device operates on a supply voltage ranging from 2.8 V to 5.5 V and supports a continuous output current of 1.25 A. Key electrical specifications include a maximum on-resistance of 110 mOhms, a turn-on delay of up to 1 ms, and a turn-off delay of up to 5 ms. It provides configurable current limiting between 630 mA and 2 A and functions reliably across an extended temperature range of -40°C to +85°C.

Feature Summary

• Autoswitching logic automatically selects the highest available input voltage source without external control signals
• Configurable current limit allows adjustment between 630 mA and 2 A to protect downstream loads
• Low on-resistance minimizes power loss and heat generation during conduction
• Integrated N-channel FETs provide seamless transition between power sources

Applications

• Battery backup systems requiring automatic switchover between primary and secondary power sources
• Portable devices needing redundant power management for critical subsystems
• Embedded systems utilizing multiple voltage rails with priority selection requirements

Procurement Notes

Verify the specific suffix 'PWR' confirms the TSSOP-8 package and tape-and-reel packaging configuration. Ensure compatibility with the target PCB footprint and reflow soldering profile. Confirm that the operating voltage range aligns with the system's power rail specifications. Check for RoHS compliance documentation if required by regional regulations. Validate that the current limit settings meet the protection requirements of the connected load.

Selection Notes

Select this component when automatic source selection based on voltage priority is required without GPIO intervention. It is suitable for applications where space constraints favor the small TSSOP-8 package over larger alternatives. Consider the 110 mOhm on-resistance for thermal management calculations. Ensure the input voltage sources do not exceed the 5.5 V absolute maximum rating. Evaluate the need for configurable current limiting versus fixed-limit alternatives in the TPS211x family.

Part Context

The TPS2115A belongs to Texas Instruments' TPS211x series of power multiplexers, which are designed for low-power portable applications. This family includes variants like the TPS2113A and TPS2114A, differing primarily in pinout configurations and specific feature sets. The TPS2115APWR specifically utilizes the standard TSSOP-8 package, distinguishing it from other package options like the PW (SOIC) variant. It serves as a core component for managing power redundancy in battery-operated devices.

Replacement Considerations

• TPS2113APWR: Similar functionality but may differ in pinout or specific electrical characteristics; verify datasheet compatibility.

FAQ

How does the TPS2115APWR determine which input source to select?

It uses internal autoswitching logic to continuously monitor both input voltages and automatically connects the output to the source with the higher voltage level.

What is the purpose of the configurable current limit?

The configurable current limit allows designers to set a threshold between 630 mA and 2 A to protect the power sources and downstream components from overcurrent conditions.