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Texas Instruments TPS7B4255QDYBRQ1
- Part No.:
- TPS7B4255QDYBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS7B4255QDYBRQ1.pdf
- Description:
- AUTOMOTIVE, 70-MA 40-V VOLTAGE-T
- Quantity:
- Payment:
- Shipping:
Inventory:4,642
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Product details
Overview
TPS7B4255QDYBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage-tracking regulator delivering 70 mA output current with ±5 mV tracking tolerance across –40°C to +125°C ambient. It operates from 3 V to 40 V input, regulates output from 2 V to 40 V, and features integrated reverse current, reverse polarity, overtemperature, and short-circuit protection - designed specifically for off-board sensor power in powertrain systems.
For engineers reviewing the TPS7B4255QDYBRQ1 datasheet, TPS7B4255QDYBRQ1 pinout, TPS7B4255QDYBRQ1 application, or TPS7B4255QDYBRQ1 equivalent, key selection criteria include its 5-mV tracking accuracy under load, 500-mV dropout at 70 mA, 35-µA quiescent current at light load, thermal shutdown at 175°C, and dual SOT-23 package options (DBV/DYB) with validated reverse-polarity survivability up to –40 V.
Technical Context
The TPS7B4255QDYBRQ1 implements a back-to-back PMOS pass transistor architecture enabling true reverse current protection and output short-to-battery survival. Its tracking error is actively regulated by an internal error amplifier comparing ADJ/EN voltage to OUT, achieving ≤5 mV deviation across full temperature, line, and load ranges.
Functional modes are governed by dual thresholds: VIN must exceed 2.7 V (rising) to exit UVLO, and ADJ/EN must exceed 1.75 V to enable regulation. In disable mode (ADJ/EN < 0.85 V), quiescent current drops to ≤3.25 µA, and thermal shutdown activates at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Tracking Accuracy | ±5 mV max - ensures ratiometric sensor supply matches reference voltage within 0.1% at 5 V, critical for precision analog measurements. |
| Dropout Voltage | 500 mV max at 70 mA - enables stable regulation even with low VIN–VOUT margin, e.g., 12 V input → 11.5 V output under full load. |
| Input Voltage Range | 3 V to 40 V operating; –40 V to +45 V absolute max - withstands automotive load dump (ISO 7637-2 Pulse 5a) and reverse-battery transients. |
| Quiescent Current | 35 µA typical at 100 µA load - minimizes standby power in always-on sensor nodes without compromising wake-up response. |
| Output Current | 70 mA max - sufficient to power multiple off-board analog sensors (e.g., pressure, temperature, exhaust gas) simultaneously. |
| Thermal Shutdown | 175°C junction activation with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| ESR Stability Range | 1 mΩ to 3 Ω - supports wide ceramic capacitor selection (1 µF–200 µF) without external compensation. |
Pinout & Package
TPS7B4255QDYBRQ1 uses the thermally enhanced 5-pin SOT-23 (DYB) package (2.93 mm × 2.7 mm), optimized for higher power dissipation versus standard DBV. Pin functions are validated per TI SBVS392A Rev. A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADJ/EN | Adjustable reference & enable input | Sets output voltage via external reference or divider; logic-low (<0.85 V) disables LDO, reducing IQ to ≤3.25 µA. |
| GND | Ground | Power and signal return path; pin 2 in DYB package (shared with pin 5 thermal pad connection). |
| IN | Unregulated input supply | Accepts 3–40 V; requires ≥500 nF ceramic capacitor close to pin for EMI robustness and transient response. |
| OUT | Regulated tracker output | Delivers voltage matching ADJ/EN within ±5 mV; requires 1–200 µF ceramic capacitor with 1 mΩ–3 Ω ESR for stability. |
| NC | No-connect | Not internally bonded; may be left floating or tied to GND to improve thermal performance in DYB package. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse polarity protection | Survives –40 V on IN while VOUT = 0 V - eliminates need for external series diode in battery-reverse fault scenarios. |
| Output short-to-battery resilience | Withstands VOUT shorted to 14 V supply while VIN = 7 V - enables safe operation in distributed sensor architectures with shared battery rails. |
| Brick-wall current limiting | Fixed 75–130 mA limit (temp-dependent) - prevents thermal runaway during output shorts without foldback distortion of sensor signals. |
| UVLO with hysteresis | 2.7 V rising / 2.4 V falling threshold with 300 mV hysteresis - ensures clean power-up/power-down sequencing during cranking or brownout events. |
| Low-noise output | 150 µVRMS (10 Hz–100 kHz) - preserves signal integrity for high-resolution ADCs interfacing with ratiometric sensors. |
Applications
| Powertrain Pressure Sensors | Powertrain Exhaust Sensors |
|---|---|
Use Scenario: Supplies 5-V ratiometric piezoresistive pressure sensors located remotely on engine manifolds via long cables subject to vibration and EMI. IC Role / Device Role / Timing Role: Voltage-tracking LDO maintaining exact match between sensor excitation and ADC reference to eliminate ratio errors. Use Value: ±5 mV tracking tolerance ensures <0.1% measurement error across –40°C to +125°C, directly improving OBD-II diagnostic accuracy. | Use Scenario: Powers wideband oxygen (WBO2) and NOx sensors mounted in hot exhaust streams where cable faults risk short-to-battery conditions. IC Role / Device Role / Timing Role: Fault-tolerant regulator providing stable 3.3-V supply while surviving reverse-polarity and output short-to-14-V battery events. Use Value: Integrated reverse-current and short-to-supply protection eliminates external protection components, reducing BOM count and PCB area by 30%. |
| Powertrain Temperature Sensors | Body Control Modules (BCM) |
Use Scenario: Delivers precise 2.5-V bias to NTC/PTC thermistors in transmission oil pans, exposed to thermal cycling and fluid immersion. IC Role / Device Role / Timing Role: Low-dropout tracker ensuring regulation remains active down to 3-V cold-cranking input while maintaining tight output tolerance. Use Value: 500-mV dropout at 70 mA enables uninterrupted operation during 6-V cranking dips, preventing false temperature fault flags. | Use Scenario: Supplies auxiliary 3.3-V rails for LIN transceivers and LED drivers in door modules, requiring ultra-low quiescent current in sleep mode. IC Role / Device Role / Timing Role: Enable-controlled LDO switched by microcontroller GPIO to gate power to non-critical subsystems. Use Value: 3.25-µA shutdown current meets ISO 16750-2 Class D requirements for <5-µA module standby, extending battery life in parked vehicles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-tracking LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B4250QDBVRQ1 | Same family, 50-mA output rating; identical 5-mV tracking, 40-V max input, and protection features. | Lower current capacity limits use to single-sensor nodes or lower-power transducers. | Select when total load ≤50 mA to reduce thermal stress and simplify thermal design. |
| TPS7B8750QKVURQ1 | Fixed-output (5.0 V) LDO; 500-mA rating; no tracking capability; includes adjustable current limit and spread-spectrum clocking. | Cannot replace tracking function; suited for non-ratiometric, high-current MCU or CAN transceiver supplies. | Choose only if application does not require voltage tracking and needs >70 mA output with enhanced EMI performance. |
Compared with TPS7B4250QDBVRQ1, the TPS7B4255QDYBRQ1 provides 40% higher output current for multi-sensor clusters; compared with TPS7B8750QKVURQ1, it delivers precise ratiometric supply essential for analog sensor accuracy but lacks fixed-output simplicity and higher current headroom.
Availability
TPS7B4255QDYBRQ1 is available at Aetrix Electronics and suitable for automotive powertrain sensing, body electronics, and industrial sensor interface applications requiring stable component supply across extended temperature and harsh electrical environments.
Supply support for TPS7B4255QDYBRQ1 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 AEC-Q100 qualification expertise and broad automotive system solutions.
The TPS7B4255-Q1 product line was engineered specifically for fault-tolerant, high-accuracy off-board sensor powering in automotive powertrain and chassis domains - prioritizing tracking precision, transient survivability, and integrated protection over generic LDO functionality.
FAQ
What is the maximum allowable input voltage for the TPS7B4255QDYBRQ1?
The TPS7B4255QDYBRQ1 has an absolute maximum input voltage rating of +45 V and –40 V, enabling robust operation during automotive load dump (ISO 7637-2 Pulse 5a) and reverse-battery fault conditions. Its recommended operating range is 3 V to 40 V; exceeding 45 V risks permanent damage per the Absolute Maximum Ratings table in the SBVS392A datasheet.
How does the TPS7B4255QDYBRQ1 achieve ±5 mV tracking accuracy?
The TPS7B4255QDYBRQ1 achieves ±5 mV tracking accuracy through a precision internal error amplifier that continuously compares the ADJ/EN reference voltage to the OUT pin, driving a back-to-back PMOS pass element. This architecture maintains output voltage within ±5 mV of the ADJ/EN voltage across –40°C to +125°C ambient, 100 µA–70 mA load, and 3 V–40 V input - verified in Section 6.5 Electrical Characteristics of the TPS7B4255QDYBRQ1 datasheet.
Can the TPS7B4255QDYBRQ1 survive an output short to the 14-V battery rail?
Yes, the TPS7B4255QDYBRQ1 survives output short-to-battery events due to its integrated back-to-back PMOS topology and reverse-current protection. When VOUT is shorted to 14 V while VIN = 7 V, the device limits reverse current to ≤0.25 µA and sustains no damage - confirmed in Section 7.3.6 and Figure 7-5 of the TPS7B4255QDYBRQ1 datasheet.
What is the shutdown current of the TPS7B4255QDYBRQ1 in disable mode?
In disable mode (ADJ/EN pin held below 0.85 V), the TPS7B4255QDYBRQ1 draws ≤3.25 µA supply current - specified as ISHUTDOWN in Section 6.5 of the datasheet. This ultra-low shutdown current supports compliance with automotive ISO 16750-2 Class D requirements for module standby power.
Which package variant does TPS7B4255QDYBRQ1 use, and how does it differ from DBV?
TPS7B4255QDYBRQ1 uses the thermally enhanced 5-pin SOT-23 (DYB) package (2.93 mm × 2.7 mm), differing from the standard DBV (2.9 mm × 2.8 mm) by improved thermal resistance: RθJA = 127.8°C/W vs. 176.3°C/W and RθJB = 16.6°C/W vs. 44.4°C/W. This enables higher continuous power dissipation in constrained automotive PCB layouts.
TPS7B4255QDYBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 40V
- Voltage Dropout (Max):
- 0.5V @ 70mA
- Current - Output:
- 70mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- 550 µA
- PSRR:
- 80dB (100Hz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Current, Reverse Polarity, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS7B4255QDYBRQ1 FAQ
1.How can I place an order for TPS7B4255QDYBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS7B4255QDYBRQ1 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 TPS7B4255QDYBRQ1 reliable?
The price and inventory of TPS7B4255QDYBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS7B4255QDYBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS7B4255QDYBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS7B4255QDYBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS7B4255QDYBRQ1?
TPS7B4255QDYBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS7B4255QDYBRQ1 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 TPS7B4255QDYBRQ1?
For technical support, including TPS7B4255QDYBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS7B4255QDYBRQ1 requirements.
6.How does Aetrix verify that TPS7B4255QDYBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS7B4255QDYBRQ1 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 TPS7B4255QDYBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS7B4255QDYBRQ1?
All TPS7B4255QDYBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS7B4255QDYBRQ1, 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 TPS7B4255QDYBRQ1 part is unused and in its original packaging.
Return procedure for TPS7B4255QDYBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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