TPS71550QDCKRQ1

Texas Instruments TPS71550QDCKRQ1: 5-V, 50-mA Ultra‑Low‑IQ Automotive LDO in SC70‑5 (DCK)

The Texas Instruments TPS71550QDCKRQ1 is a fixed 5-V, 50-mA, ultra‑low‑quiescent-current linear regulator designed for automotive and always‑on applications. As part of the TPS715‑Q1 family, this AEC‑Q100 qualified LDO supports high input voltages up to 24 V, prioritizes battery life with a typical 3 µA IQ, and integrates protection features in a compact SC70‑5 (DCK) package for tight board spaces.

Key Features and Value Proposition

Ultra‑low IQ for always‑on rails

The TPS71550QDCKRQ1 features a typical quiescent current of approximately 3 µA, making it well suited for keep‑alive rails and modules that must remain powered when the ignition is off. Low IQ minimizes parasitic battery drain in body electronics, telematics, and security systems.

High input voltage capability

With support for input voltages up to 24 V, this device accommodates the wide and sometimes noisy supply conditions common in automotive environments. Designers can regulate a clean 5‑V rail for sensitive subsystems from vehicle battery lines without resorting to larger, more complex solutions.

Automotive‑grade reliability

This device is AEC‑Q100 qualified, aligning with automotive qualification requirements. It supports an extended operating temperature range from −40°C to +125°C and includes built‑in overcurrent and thermal shutdown protection to help safeguard both the regulator and downstream loads.

Space‑saving package for dense PCBs

Housed in an SC‑70‑5 (DCK) package, the TPS71550QDCKRQ1 provides a compact footprint and low height profile suited to constrained designs such as camera modules, sensor nodes, and distributed point‑of‑load rails across a vehicle harness. It is supplied in tape‑and‑reel (TR) packaging for high‑volume, automated assembly.

Parametric Snapshot

• Manufacturer/Brand: Texas Instruments
• MPN: TPS71550QDCKRQ1
• Series: TPS715‑Q1
• Category: PMIC – Voltage Regulators – Linear (LDO)
• Regulator Type: Positive, fixed LDO
• Fixed Output Voltage: 5 V
• Maximum Output Current: 50 mA
• Maximum Input Voltage: 24 V
• Quiescent Current (typ): 3 µA
• Operating Temperature Range: −40°C to +125°C
• Protection: Overcurrent, Thermal Shutdown
• Automotive Qualification: AEC‑Q100
• Package/Case: SC‑70‑5 (DCK)
• Mounting Type: Surface Mount
• Pin Count: 5
• Packaging: Tape & Reel (TR)

Applications and Use Cases

Automotive keep‑alive and always‑on supplies

• Body control modules, door/seat modules, and lighting controllers that need a standby brain supply.
• Telematics and connectivity units that maintain network presence or wake‑on‑event capability at microamp‑level standby currents.
• ADAS subsystems where sensor bias rails must remain energized for rapid startup without excessive battery drain.

Battery‑powered or long‑life designs

• Battery‑backed modules that require microamp‑level IQ to maximize lifetime.
• Small sensor nodes and distributed modules powered from unregulated lines that need a clean 5‑V local rail.

General point‑of‑load (PoL) regulation

• Board‑level 5‑V rails derived from higher voltage distribution busses in industrial and transportation systems.
• Space‑constrained designs that benefit from SC70‑5 packaging and simple, low‑component‑count power trees.

Design‑In Considerations

Input headroom and dropout

• Ensure the input supply provides sufficient headroom above 5 V to satisfy the regulator’s dropout at the intended load current. Dropout voltage is not specified in the provided data; consult the TPS715‑Q1 datasheet for curves and worst‑case limits.
• The device supports up to 24 V input. Verify that normal and transient conditions (including cold‑crank and load‑dump protection at the system level) remain within device ratings per the datasheet.

Power dissipation and thermal margins

• In an SC70‑5 (DCK) package, thermal design deserves attention, especially at higher VIN − VOUT differentials and near 50 mA load. Estimate dissipation as (VIN − 5 V) × IOUT and confirm that junction temperature remains within the −40°C to +125°C operating range under worst‑case ambient and airflow conditions.
• Use copper pour around the package pads where possible to improve heat spreading.

Protections and fault behavior

• Built‑in overcurrent and thermal shutdown help protect against overload and short‑circuit conditions. Design system‑level fault handling to ensure safe recovery once normal conditions return.

Output stability and capacitors

• Output capacitor selection, ESR range, and minimum values for stability are not specified in the provided data. Refer to the TPS715‑Q1 datasheet for recommended input/output capacitor values, types, and placement guidance. Keep traces short and provide local decoupling near VIN and VOUT pins.

Noise‑sensitive loads

• While output noise and PSRR metrics are not included in the provided data, the TPS71550QDCKRQ1 is intended as a clean 5‑V supply for sensitive logic and analog sections. For stringent analog/RF use, verify noise and PSRR performance in the datasheet and validate with bench testing.

Start‑up and sequencing

• If your system requires specific power‑up timing or sequencing, consult the datasheet for enable behavior (if applicable for the family) and start‑up characteristics. Not specified in the provided data.

Specifications Summary

• Output Voltage: 5 V (fixed)
• Max Output Current: 50 mA
• Input Voltage (Max): 24 V
• Quiescent Current (Typ): 3 µA
• Regulator Type: Positive, Fixed LDO
• Operating Temperature: −40°C to +125°C
• Protection Features: Overcurrent, Thermal Shutdown
• Automotive Qualification: AEC‑Q100
• Package/Case: SC‑70‑5 (DCK), Surface Mount
• Pin Count: 5
• Packaging: Tape & Reel (TR)
• Parameters not specified here (refer to datasheet): Dropout voltage, output noise density, PSRR, line/load regulation, output accuracy, enable pin details, recommended capacitor values, and transient response.

Lifecycle, Quality, and Compliance

Lifecycle status

• Status: Active (per Texas Instruments product information).

Compliance

• Automotive: AEC‑Q100 qualified.
• RoHS: Compliant (lead‑free/green), as indicated.
• REACH: Compliant.

Note: For documentation such as PPAP or additional quality artifacts, consult TI or authorized channels. These items are not specified in the provided data.

Sourcing and Availability

Ordering and packaging

• Orderable Part: TPS71550QDCKRQ1 (fixed 5 V variant of the TPS715‑Q1 family).
• Package: SC‑70‑5 (DCK) in tape‑and‑reel (TR) for automated assembly.

Supply considerations

• Availability: Varies by distributor and region. Check authorized TI distributors and the TI product page for current lead times and stocking.
• Pricing: Automotive‑grade reels often have MOQ tiers; pricing varies by geography and volume.

Substitution guidance

• Approved alternates: None listed in the provided data.
• If substitution is necessary, verify:
• Electrical compatibility (VIN rating up to 24 V, output 5 V fixed, output current 50 mA class).
• Dropout voltage and quiescent current (IQ) vs. system standby budget.
• Protection features and operating temperature range.
• Package, pinout, and PCB footprint (SC70‑5 DCK vs. other SOT/SC70 codes).
• Policy note: Always validate pin‑to‑pin and electrical compatibility; alternates may differ in dropout, IQ, or protections.

Where the Texas Instruments TPS71550QDCKRQ1 Fits Best

• Keep‑alive rails in body electronics and telematics where microamp IQ extends parked battery life.
• Distributed 5‑V point‑of‑load regulators across high‑voltage busses in vehicles or industrial gear.
• Space‑constrained sensor and camera modules needing a small, robust 5‑V LDO.

Practical Tips for a Robust Design

• Budget standby power: The typical 3 µA IQ significantly reduces parasitic drain; include worst‑case bounds from the datasheet in your battery life model.
• Validate thermal at extremes: Use worst‑case VIN and ambient temperature to confirm thermal headroom, particularly around 50 mA load.
• Layout matters: Short, wide traces for VIN and VOUT, solid ground reference, and local input/output capacitors placed as close as practical to the pins help stability and transient performance.
• Plan for automotive transients: Combine the LDO with appropriate upstream protection (e.g., transient suppression and input filtering) to handle system‑level surge conditions while keeping the device within its absolute maximum ratings.

Frequently Asked Questions (FAQs)

What is the maximum input voltage?

The TPS715‑Q1 family supports input voltages up to 24 V.

What is the output current capability?

Up to 50 mA continuous.

What package is TPS71550QDCKRQ1 supplied in?

SC‑70‑5 (TI package code DCK), tape‑and‑reel.

Is it automotive qualified?

Yes. The TPS71550QDCKRQ1 is AEC‑Q100 qualified.

What is the typical quiescent current?

Approximately 3 µA (typical), as specified for the family in the provided data.

What is the dropout voltage?

Not specified in the provided data. Refer to the TPS715‑Q1 datasheet for dropout characteristics across load, temperature, and process.

What operating temperature range does it support?

−40°C to +125°C.

Does it include protection features?

Yes. Overcurrent and thermal shutdown protection are included.

Resources

• Product page: https://www.ti.com/product/TPS715-Q1
• Datasheet: https://www.ti.com/lit/ds/symlink/tps715-q1.pdf

Summary

The Texas Instruments TPS71550QDCKRQ1 is a compact, 5‑V fixed, 50‑mA LDO tailored for automotive and always‑on applications where ultra‑low quiescent current is essential. Its up‑to‑24‑V input capability, AEC‑Q100 qualification, and integrated protections make it a dependable choice for keep‑alive rails and distributed point‑of‑load regulation. With SC70‑5 (DCK) packaging and tape‑and‑reel availability, it fits modern, space‑limited PCB layouts and high‑volume manufacturing flows. For detailed electrical limits—such as dropout, accuracy, PSRR, and capacitor requirements—consult the TI TPS715‑Q1 datasheet and validate under your system’s worst‑case conditions.