Texas Instruments TPS715345DCKRM3

Overview

TPS715345DCKRM3 from Texas Instruments is a fixed-output 3.45-V, 50-mA low-dropout linear regulator with 3.2-μA quiescent current, stable with ≥0.47-μF output capacitance, and rated for –40°C to +125°C junction temperature in SC70-5 (DCK) package. It serves as a primary power supply for ultra-low-power microcontrollers in battery-operated sensing nodes.

For engineers reviewing the TPS715345DCKRM3 datasheet, TPS715345DCKRM3 pinout, TPS715345DCKRM3 application, or TPS715345DCKRM3 equivalent, key selection criteria include dropout voltage at 50 mA (415 mV typ), input voltage range (2.5 V to 24 V), output accuracy (±4%), thermal performance (R_θJB = 40.7°C/W), and compatibility with ceramic output capacitors ≥0.47 μF.

Technical Context

The TPS715345DCKRM3 implements a CMOS pass transistor architecture with internal bandgap reference (1.205 V) and leakage-null control circuitry active below 5 μA load. Its dropout behavior follows R_DS(ON)-based scaling, delivering 415 mV typical dropout at 50 mA and maintaining regulation down to 2.5 V input.

It features internal soft-start to limit inrush current into the output capacitor and brick-wall overcurrent protection with 125–350 mA current limit (new chip), triggered when V_OUT = 0 V and VIN ≥ 3.5 V. No enable pin is present - operation is always active upon valid input.

Key Specifications

Pinout & Package

Package: SC70-5 (DCK), 2.00 mm × 1.25 mm body size, 0.65 mm pitch, single-row surface-mount. Thermal pad not present; NC pins must be grounded for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS715345DCKRM3, TPS71533DCKRM3 offers identical performance at 3.3 V for legacy logic compatibility, while MCP1703T-345I/TT trades 24-V input support and SC70 size for higher current capability in a less space-constrained layout.

Availability

TPS715345DCKRM3 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, medical wearables, and building automation controllers requiring stable component supply, long-lifecycle assurance, and guaranteed traceable sourcing.

Supply support for TPS715345DCKRM3 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, embedded processing, and power management technologies, with decades of LDO design heritage and broad industrial qualification.

The TPS715 family targets ultra-low-power, wide-input industrial and battery-powered applications - designed specifically to replace legacy high-I_Q regulators in space- and energy-constrained systems without sacrificing voltage range or reliability.

FAQ

What is the maximum input voltage rating for TPS715345DCKRM3?

The TPS715345DCKRM3 is rated for up to 24 V under normal operating conditions; however, the absolute maximum input voltage is 30 V for new-chip revisions (M3 suffix). Operation above 24 V is limited to transient conditions and must remain within the absolute maximum ratings to avoid permanent damage.

Does TPS715345DCKRM3 require an enable pin to operate?

No, the TPS715345DCKRM3 has no enable (EN) pin and operates continuously whenever a valid input voltage (≥2.5 V) is applied. It enters regulation immediately after power-up, with internal soft-start limiting output inrush current. This simplifies designs where always-on operation is required.

Can TPS715345DCKRM3 be used with a 0.47-μF ceramic output capacitor?

Yes, the TPS715345DCKRM3 is explicitly characterized and guaranteed stable with output capacitance ≥0.47 μF, including X5R/X7R ceramic types. The datasheet confirms stability down to this value with proper derating (effective capacitance ≥0.47 μF at bias and temperature), eliminating need for larger or specialized capacitors.

What is the thermal performance of TPS715345DCKRM3 in its SC70-5 package?

The TPS715345DCKRM3 (new-chip M3 revision) has a junction-to-board thermal resistance (R_θJB) of 40.7°C/W. With 250 mW power dissipation (e.g., 5 V_IN @ 50 mA), board temperature rise is ~10°C - enabling reliable operation on standard FR4 without thermal vias or heatsinks when NC pins are grounded.

How does the overcurrent protection behave in TPS715345DCKRM3?

The TPS715345DCKRM3 employs a brick-wall overcurrent limit that activates when output current exceeds 125–350 mA (depending on VIN), causing output voltage to collapse while limiting power dissipation. It does not latch off - regulation resumes automatically once fault clears and thermal limits are respected.