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Texas Instruments TPS71550QDCKRM3Q1
- Part No.:
- TPS71550QDCKRM3Q1
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TPS71550QDCKRM3Q1.pdf
- Description:
- AUTOMOTIVE, 50MA 24V ULTRA-LOW-I
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
TPS71550QDCKRM3Q1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 50-mA low-dropout linear regulator with fixed 5.0-V output, 2.5–24-V input range, 3.2-μA quiescent current, and 415-mV typical dropout at 50 mA - designed for battery-powered microcontrollers and powertrain control modules.
For engineers reviewing the TPS71550QDCKRM3Q1 datasheet, TPS71550QDCKRM3Q1 pinout, TPS71550QDCKRM3Q1 application, or TPS71550QDCKRM3Q1 equivalent, key selection criteria include ultra-low IQ stability across –40°C to +125°C, SC70-5 package thermal performance (RθJB = 40.7°C/W), 0.47-μF minimum stable output capacitance, and integrated overcurrent protection without external components.
Technical Context
The TPS71550QDCKRM3Q1 implements a CMOS pass transistor architecture with internal bandgap reference (1.205 V) and leakage-null control circuit active below 5 μA load. Its dropout behavior follows RDS(ON)-based scaling, delivering 415 mV at 50 mA and maintaining regulation down to VIN = VOUT + VDO across temperature.
It features internal soft-start to limit inrush current into the output capacitor and operates in two functional modes: normal regulation (VIN > VOUT + VDO, IOUT < ICL) and dropout (VIN < VOUT + VDO), where output voltage tracks input with degraded transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over –40°C to +125°C; enables direct replacement of legacy 5-V logic rails without feedback resistors. |
| Quiescent Current | 3.2 μA typical, stable from 0 to 50 mA load; extends battery life in always-on automotive modules such as door ECUs and sensor nodes. |
| Input Voltage Range | 2.5 V to 24 V; supports cold-crank (≥4.5 V) and load-dump (≤24 V) conditions in 12-V automotive systems without external protection. |
| Dropout Voltage | 415 mV typical at 50 mA, 525 mV max (new chip); allows regulation from 5.515 V input at full load - critical for post-ignition rail stability. |
| Output Capacitance | Stable with ≥0.47 μF ceramic output capacitor; eliminates need for large tantalum or electrolytic caps, reducing board area and cost. |
| Thermal Resistance | RθJB = 40.7°C/W (new chip); enables 50-mA operation at +125°C ambient with minimal PCB copper, suitable for dense under-hood layouts. |
| ESD Rating | CDM C5 (±1500 V), HBM H2 (±3000 V); meets AEC-Q100-002/-011 for robustness in automated assembly and field environments. |
Pinout & Package
TPS71550QDCKRM3Q1 uses the 5-pin SC70 (DCK) package: 2.00 mm × 1.25 mm body, 0.65-mm pitch, single-row SMT footprint optimized for high-density automotive PCBs. Thermal performance is enhanced when NC pins (1 and 3) are connected to ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect | Internally unconnected; tie to GND for improved thermal dissipation and EMI suppression - not required for functionality. |
| 2 (GND) | Ground reference | Primary return path for regulator current and internal bias; must connect to low-impedance system ground plane. |
| 3 (NC) | No-connect | Internally unconnected; same thermal/EMI guidance as Pin 1 - floating allowed but grounded preferred. |
| 4 (IN) | Input supply | Accepts 2.5–24 V; requires ≤0.047 μF input capacitor only for source impedance mitigation during transients. |
| 5 (OUT) | Regulated output | Delivers stable 5.0 V; requires ≥0.47 μF ceramic capacitor on same side of PCB, placed within 3 mm of OUT/GND pins. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with HBM ±3000 V / CDM ±1500 V ESD - certified for safety-critical body electronics and powertrain use. |
| Ultra-low quiescent current | 3.2 μA typical across full 0–50 mA load range and temperature; enables >10-year battery life in always-on telematics and CAN node applications. |
| Internal soft-start | Controls output ramp rate during power-up to limit inrush into downstream capacitors - prevents brownout in shared 5-V domains. |
| Overcurrent protection | Brick-wall current limit (125–350 mA depending on VIN); protects against short-circuit faults without external foldback circuitry. |
| Wide-input, low-dropout operation | Operates from 2.5 V up to 24 V with 415-mV dropout at 50 mA - supports start-stop systems and 24-V commercial vehicle platforms. |
Applications
| Infotainment Power Rail | Body Control Module (BCM) |
|---|---|
Use Scenario: Supplies 5-V logic and interface circuits in digital clusters and head units exposed to wide battery voltage swings. IC Role / Device Role / Timing Role: Primary 5-V LDO for MCU peripherals, display drivers, and USB PHYs requiring low-noise, stable voltage under load dump. Use Value: Maintains regulation during 24-V load dump events while consuming only 3.2 μA in sleep mode - reduces standby power by >90% vs. standard LDOs. |
Use Scenario: Powers door lock actuators, window lift controllers, and interior lighting modules with intermittent high-current pulses. IC Role / Device Role / Timing Role: Local 5-V regulator for microcontroller I/O and CAN transceiver bias, placed near load to minimize trace inductance. Use Value: Stable 5.0-V output with 0.47-μF ceramic cap eliminates bulk capacitance, shrinking module size while meeting ISO 16750-2 pulse test requirements. |
| Powertrain Sensor Interface | Factory Automation I/O Module |
Use Scenario: Provides clean 5-V bias to engine knock sensors, cam/crank position sensors, and exhaust gas recirculation (EGR) valves. IC Role / Device Role / Timing Role: Low-noise, high-PSRR (60 dB @ 100 kHz) LDO isolating analog sensor front-ends from noisy 12-V battery rail. Use Value: 425 μVrms output noise (new chip) ensures sub-mV signal integrity for precision ADC sampling in OBD-II diagnostic systems. |
Use Scenario: Powers isolated digital I/O channels in industrial PLCs operating in 24-V DC control cabinets with high EMI. IC Role / Device Role / Timing Role: Point-of-load regulator for FPGA configuration banks and optocoupler LED drivers requiring AEC-Q100 reliability. Use Value: RθJB = 40.7°C/W enables continuous 50-mA operation at +70°C ambient without heatsinking - simplifies thermal design in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS71533QDCKRM3Q1 | Fixed 3.3-V output; identical package, IQ, dropout, and thermal specs. | Used where 3.3-V logic domains dominate (e.g., CAN FD controllers, ARM-based gateways). | Select when system requires 3.3 V instead of 5 V - pin-compatible with no layout change, same BOM management. |
| NCP1117ST50T3G | Higher IQ (6 mA), larger SOT-223 package, no AEC-Q100 qualification, 1.2-V dropout at 1 A. | Targeted at non-automotive industrial applications with less stringent reliability or thermal constraints. | Choose only for cost-sensitive non-automotive designs; lacks Grade 1 temp rating, ESD robustness, and ultra-low IQ needed for automotive sleep modes. |
Compared with TPS71533QDCKRM3Q1, the TPS71550QDCKRM3Q1 delivers identical performance in a pin-compatible 5-V variant - ideal for platform reuse across 3.3-V and 5-V subsystems. Versus NCP1117ST50T3G, it provides 1875× lower quiescent current and automotive qualification, enabling reliable always-on operation where microamp-level standby matters.
Availability
TPS71550QDCKRM3Q1 is available at Aetrix Electronics and suitable for hybrid/electric powertrain systems, body electronics modules, and infotainment clusters requiring stable component supply with automotive-grade lifecycle assurance.
Supply support for TPS71550QDCKRM3Q1 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 automotive ICs, with decades of experience in high-reliability power management solutions.
The TPS715-Q1 product line was engineered specifically for automotive battery-powered systems demanding ultra-low quiescent current, wide input range, and AEC-Q100 compliance - targeting powertrain, body, and infotainment subsystems.
FAQ
What is the maximum input voltage supported by the TPS71550QDCKRM3Q1?
The TPS71550QDCKRM3Q1 supports a maximum input voltage of 24 V for both legacy and new chip versions, with the new chip rated up to 30 V absolute maximum. For continuous operation, the recommended maximum is 24 V per AEC-Q100 operating conditions - sufficient to withstand automotive load-dump transients defined in ISO 16750-2.
Does the TPS71550QDCKRM3Q1 require an input capacitor?
The TPS71550QDCKRM3Q1 does not require an input capacitor for stability, but Texas Instruments recommends a 0.047-μF ceramic capacitor at the IN pin to suppress ringing caused by source inductance during load transients. This improves system-level robustness without impacting the LDO's inherent stability with ≥0.47 μF at the output.
Is the TPS71550QDCKRM3Q1 pin-compatible with other TPS715-Q1 variants?
Yes - all TPS715-Q1 SC70-5 fixed-output variants, including TPS71550QDCKRM3Q1, share identical pinout (IN, GND, NC, IN, OUT) and package dimensions. The fixed-output versions differ only in internal feedback network; no PCB redesign is needed when switching between 1.8-V, 3.3-V, or 5.0-V options.
What thermal derating applies to the TPS71550QDCKRM3Q1 at 125°C ambient?
At +125°C ambient, the TPS71550QDCKRM3Q1 (new chip) maintains full 50-mA output capability when mounted on a 2s2p JEDEC board, thanks to its RθJB = 40.7°C/W. Junction temperature remains within 150°C limit assuming ≤150 mW power dissipation (e.g., VIN = 12 V, VOUT = 5 V, IOUT = 50 mA → PD = 350 mW requires additional copper area or airflow).
How does the leakage-null control circuit affect TPS71550QDCKRM3Q1 operation?
The leakage-null control circuit in the TPS71550QDCKRM3Q1 activates only when output load is below ~5 μA, VIN exceeds 18 V, and die temperature is above 100°C - conditions typical in hot under-hood shutdown states. It reduces ground current drift, ensuring the specified 3.2-μA IQ remains stable even in extreme thermal stress scenarios.
TPS71550QDCKRM3Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.75V @ 50mA
- Current - Output:
- 50mA
- Current - Quiescent (Iq):
- 5.8 mA
- Current - Supply (Max):
- 5.8 mA
- PSRR:
- 60dB (100kHz)
- Control Features:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
TPS71550QDCKRM3Q1 FAQ
1.How can I place an order for TPS71550QDCKRM3Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS71550QDCKRM3Q1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS71550QDCKRM3Q1 reliable?
The price and inventory of TPS71550QDCKRM3Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS71550QDCKRM3Q1 is usually 5 days.
3.What payment methods are accepted for TPS71550QDCKRM3Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS71550QDCKRM3Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS71550QDCKRM3Q1?
TPS71550QDCKRM3Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS71550QDCKRM3Q1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS71550QDCKRM3Q1?
For technical support, including TPS71550QDCKRM3Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS71550QDCKRM3Q1 requirements.
6.How does Aetrix verify that TPS71550QDCKRM3Q1 is sourced from the original manufacturer or authorized distributors?
All TPS71550QDCKRM3Q1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS71550QDCKRM3Q1 meets industry standards.
7.What is the process for return or replacement of TPS71550QDCKRM3Q1?
All TPS71550QDCKRM3Q1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS71550QDCKRM3Q1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS71550QDCKRM3Q1 part is unused and in its original packaging.
Return procedure for TPS71550QDCKRM3Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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