Texas Instruments TPS71550DCKRM3

Overview

TPS71550DCKRM3 from Texas Instruments is a fixed-output 5.0-V, 50-mA low-dropout linear regulator in SC70-5 package, featuring 3.2 μA typical quiescent current, 2.5 V to 24 V input range, and stable operation with ≥0.47 μF output capacitance. It delivers precision voltage regulation for ultra-low-power microcontrollers in battery-powered industrial sensors and metering systems.

For engineers reviewing the TPS71550DCKRM3 datasheet, TPS71550DCKRM3 pinout, TPS71550DCKRM3 application, or TPS71550DCKRM3 equivalent, key selection criteria include dropout voltage at full load (415 mV typ), thermal performance in SC70 (R_θJB = 40.7°C/W), junction temperature range (–40°C to +125°C), and compatibility with ceramic output capacitors down to 0.47 μF.

Technical Context

The TPS71550DCKRM3 implements a CMOS-based LDO architecture with internal bandgap reference (1.205 V), leakage-null control circuit active under high-VIN/low-IOUT conditions, and brick-wall overcurrent protection limiting output to 125–350 mA depending on VIN. Its pass transistor operates in linear mode during regulation and transitions to ohmic region in dropout, where V_OUT tracks V_IN with degraded transient response.

It features internal soft-start to limit inrush current into C_OUT, supports no external feedback network (fixed 5.0-V version), and maintains stable regulation across –40°C to +125°C junction temperature without requiring input capacitance-though 0.1 μF is recommended for source impedance mitigation.

Key Specifications

Pinout & Package

TPS71550DCKRM3 uses the 5-pin SC70 (DCK) package, 2.00 mm × 1.25 mm body size, with exposed pad not connected internally. Pin 1 (OUT) and Pin 4 (IN) are power terminals; Pin 2 (GND) is ground reference; Pins 1 and 3 are NC (no-connect) - TI recommends grounding Pin 3 for improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS71550DCKRM3, TPS71533DCKRM3 offers identical performance in a drop-in 3.3-V variant, while MCP1700T-5002E/TT trades 24-V input support and SC70 miniaturization for lower IQ and lower cost in sub-6-V systems.

Availability

TPS71550DCKRM3 is available at Aetrix Electronics and suitable for smart utility metering, industrial sensor nodes, building automation controllers, and medical point-of-care monitors requiring stable component supply with long lifecycle assurance.

Supply support for TPS71550DCKRM3 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS715 family is designed specifically for ultra-low-power, wide-input-voltage LDO regulation in space-constrained battery and industrial applications - prioritizing quiescent current, thermal efficiency, and robustness over high-current capability.

FAQ

What is the maximum input voltage rating for TPS71550DCKRM3?

The TPS71550DCKRM3 has an absolute maximum input voltage of 30 V for the new chip revision (M3 suffix), with recommended operating range up to 24 V. Exceeding 30 V risks permanent damage. The device maintains regulation from 2.5 V minimum input, making it suitable for both single-cell Li-ion and 24-V industrial rails.

Does TPS71550DCKRM3 require an input capacitor?

TPS71550DCKRM3 does not require an input capacitor for stability, but Texas Instruments recommends a 0.1 μF ceramic capacitor from IN to GND to counteract source inductance and prevent system-level ringing during load transients. This improves robustness in noisy industrial or switching-converter-fed environments.

Can TPS71550DCKRM3 operate with a 0.47 μF output capacitor?

Yes - TPS71550DCKRM3 is explicitly characterized and guaranteed stable with output capacitance ≥0.47 μF (50% derated value), including standard X5R/X7R ceramic types. This enables use of small-case MLCCs (e.g., 0402, 0603) without ESR constraints, reducing solution size and cost.

What is the thermal performance of TPS71550DCKRM3 in its SC70 package?

TPS71550DCKRM3 in the DCK (SC70-5) package has R_θJB = 40.7°C/W (junction-to-board), allowing ~350 mW power dissipation before reaching 125°C junction temperature at 25°C board temperature. Grounding the NC pins improves heat transfer; no thermal pad is present, so PCB copper area is the primary thermal path.

Is TPS71550DCKRM3 pin-compatible with other TPS715 variants?

Yes - all TPS715 fixed-output versions (e.g., TPS71533DCKRM3, TPS71518DCKRM3) share identical SC70-5 pinout and package dimensions. Pin-for-pin replacement is supported across the fixed-voltage family; only the output voltage differs, requiring no PCB changes when migrating between 1.8 V, 3.3 V, or 5.0 V variants.