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Texas Instruments TPS78401BQWDRBRQ1
- Part No.:
- TPS78401BQWDRBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS78401BQWDRBRQ1.pdf
- Description:
- AUTOMOTIVE, 300-MA, LOW-IQ, HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,976
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Product details
Overview
TPS78401BQWDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage regulator delivering 300 mA output current with ultra-low dropout (115 mV max at 300 mA, 3.3 VOUT), ±1.7% output accuracy over –40°C to +150°C junction temperature, and 50-dB PSRR up to 100 kHz-designed for powering noise-sensitive analog circuits in automotive head units and telematics control units.
For engineers reviewing the TPS78401BQWDRBRQ1 datasheet, TPS78401BQWDRBRQ1 pinout, TPS78401BQWDRBRQ1 application, or TPS78401BQWDRBRQ1 equivalent, this page provides verified package mapping (8-pin wettable flank VSON), functional safety documentation support, active output discharge, 25 µA typical quiescent current, and confirmed fixed-output configuration for stable post-regulation in safety-critical automotive subsystems.
Technical Context
The TPS78401BQWDRBRQ1 implements a PMOS pass transistor architecture enabling ultra-low dropout and reverse-current blocking without external diodes. Its internal 500-µs soft-start and foldback current limiting ensure controlled startup and thermal protection during overload conditions across –40°C to +150°C operation.
It features a dedicated EN input for precise power sequencing, active pulldown circuitry for rapid output discharge on disable, and a ground-referenced feedback path optimized for stability with 1-µF ceramic output capacitance-supporting both fixed-output and adjustable configurations via FB pin routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 300 mA maximum continuous load-supports high-current analog rails like ADC references or RF front-end biasing. |
| Dropout Voltage | 115 mV max at 300 mA and 3.3 VOUT-enables regulation from 3.415 V input, critical for battery-powered automotive systems near end-of-discharge. |
| Output Accuracy | ±1.7% over –40°C to +150°C-ensures reliable operation of precision sensors and communication ICs without calibration drift. |
| PSRR | 50 dB at 100 kHz-suppresses switching noise from upstream DC/DC converters feeding sensitive analog loads. |
| Quiescent Current | 25 µA typical-minimizes standby power loss in always-on vehicle modules such as remote keyless entry receivers. |
| Input Voltage Range | 1.65 V to 6.0 V-compatible with 12-V battery-derived rails (via pre-regulator) and direct 3.3-V/5-V system supplies. |
| Enable Threshold | VEN(HI) = 0.85 V min-ensures robust logic-level compatibility with automotive microcontrollers and CAN transceivers. |
Pinout & Package
TPS78401BQWDRBRQ1 uses the 3.00 mm × 3.00 mm wettable flank VSON-8 (DRB) package with exposed thermal pad electrically tied to GND-optimized for automotive PCB reflow inspection and thermal dissipation (RθJA = 61.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output | Delivers stable voltage to load; requires ≥0.47 µF ceramic capacitor to ground for stability. |
| 2 - NC | No-connect | Not internally bonded; connect to GND for improved thermal performance. |
| 3 - NC | No-connect | Not internally bonded; connect to GND for improved thermal performance. |
| 4 - NC | No-connect | Not internally bonded; connect to GND for improved thermal performance. |
| 5 - GND | Ground reference | Primary return path; must be connected to low-impedance PCB ground plane. |
| 6 - EN | Enable control | Active-high logic input; drives device ON when ≥0.85 V, OFF when ≤0.425 V-enables system-level power sequencing. |
| 7 - NC | No-connect | Not internally bonded; connect to GND for improved thermal performance. |
| 8 - IN | Input supply | Accepts 1.65–6.0 V; requires ≥0.1 µF ceramic capacitor to GND placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with 150°C junction rating-meets automotive ECU reliability requirements. |
| Functional Safety-Capable documentation | TI provides FIT rate data, failure mode analysis, and safety manual-supports ISO 26262 ASIL-B system integration. |
| Active output discharge | Internal pulldown resistor (~120 Ω at 3.3 V) rapidly discharges output on disable-prevents floating voltages in multi-rail power domains. |
| Ultra-low dropout with PMOS pass element | Eliminates need for external reverse-blocking diode while maintaining <120 mV dropout at full load-reduces BOM count and board space. |
| 500-µs internal soft-start | Controls inrush current during power-up-allows use of smaller input capacitance and avoids triggering upstream current-limit protection. |
Applications
| Automotive Head Units | Hybrid Instrument Clusters |
|---|---|
Use Scenario: Powering audio DACs, touchscreen controllers, and display timing ICs in infotainment head units operating from 12-V battery via intermediate 5-V rail. IC Role / Device Role / Timing Role: Post-regulator providing clean, low-noise 3.3-V or 1.8-V supply with fast transient response to dynamic audio processing loads. Use Value: 50-dB PSRR at 100 kHz suppresses switching noise from buck converters, preserving SNR in high-fidelity audio paths. | Use Scenario: Supplying microcontroller core voltage and CAN transceiver I/O rails in digital instrument clusters with mixed-signal content. IC Role / Device Role / Timing Role: Fixed-output LDO delivering 1.2-V core and 3.3-V interface voltage with ±1.7% accuracy across full automotive temperature range. Use Value: Guaranteed 300-mA output supports simultaneous operation of MCU, graphics engine, and CAN FD PHY without brownout. |
| Telematics Control Units | DC/DC Converter Post-Regulation |
Use Scenario: Biasing GNSS RF front-end, cellular modem baseband, and secure boot controller in LTE/V2X telematics modules. IC Role / Device Role / Timing Role: Low-IQ (25 µA typ) LDO enabling always-on GPS acquisition and wake-on-event functionality with minimal battery drain. Use Value: Active output discharge ensures safe reset sequencing when modem enters deep sleep-eliminates need for external pull-down resistors. | Use Scenario: Tight-regulation stage after wide-input buck converter supplying FPGA I/O banks or high-speed SerDes interfaces. IC Role / Device Role / Timing Role: Precision LDO correcting residual ripple and load-induced droop from primary DC/DC stage. Use Value: 115-mV dropout enables regulation from 3.415 V input-maximizes efficiency margin when buck output sags under heavy load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B8750QKVURQ1 | Higher 500-mA output, 300-mV dropout at 500 mA, no active discharge, 40-µA IQ | Targeted at higher-current MCU cores; lacks pulldown circuit for fast discharge. | Select when >300 mA load current is required and active discharge is not needed. |
| TLV73312PQDBVRQ1 | Lower 300-mA rating, 250-mV dropout at 300 mA, 65-µA IQ, no functional safety documentation | Cost-optimized alternative without AEC-Q100 Grade 1 or safety manual support. | Select for non-safety-critical body electronics where qualification overhead is unnecessary. |
Compared with TPS7B8750QKVURQ1 and TLV73312PQDBVRQ1, the TPS78401BQWDRBRQ1 uniquely combines AEC-Q100 Grade 1 qualification, active output discharge, and 25-µA quiescent current-making it optimal for noise-sensitive, always-on automotive subsystems requiring functional safety evidence.
Availability
TPS78401BQWDRBRQ1 is available at Aetrix Electronics and suitable for automotive head units, hybrid instrument clusters, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle assurance.
Supply support for TPS78401BQWDRBRQ1 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 and embedded processing technologies, with decades of automotive-grade product development and manufacturing expertise.
The TPS784-Q1 product line delivers high-accuracy, low-dropout regulators engineered specifically for automotive infotainment, ADAS, and body electronics-emphasizing functional safety readiness, thermal robustness, and noise immunity in harsh environments.
FAQ
What is the maximum output current capability of the TPS78401BQWDRBRQ1?
The TPS78401BQWDRBRQ1 delivers up to 300 mA of continuous output current under specified thermal conditions. This rating is validated across the full AEC-Q100 Grade 1 temperature range (–40°C to +125°C ambient) with proper PCB thermal design using the wettable flank VSON-8 package. The device incorporates foldback current limiting to protect against sustained overloads without thermal shutdown interruption.
Does the TPS78401BQWDRBRQ1 support adjustable output voltage?
No, the TPS78401BQWDRBRQ1 is a fixed-output variant with no feedback (FB) pin connection-its output voltage is factory-set and not user-configurable. The part number suffix "01" indicates a 1.0-V nominal output. For adjustable versions, TI offers TPS784xxBQWDRBRQ1 variants with FB pin exposed (e.g., TPS78412BQWDRBRQ1 for 1.2 V adjustable).
What is the purpose of the NC pins on the TPS78401BQWDRBRQ1 VSON-8 package?
The TPS78401BQWDRBRQ1 has four NC (no-connect) pins (pins 2, 3, 4, and 7) that are not internally bonded. TI recommends connecting these pins to the PCB ground plane to improve thermal performance and mechanical reliability during reflow soldering-this practice enhances heat dissipation through the package's thermal pad and reduces stress on solder joints in automotive vibration environments.
How does the active output discharge feature work in the TPS78401BQWDRBRQ1?
The TPS78401BQWDRBRQ1 integrates an internal pulldown switch between OUT and GND that activates automatically when the EN pin is driven low. This circuit presents ~120 Ω resistance at 3.3 V, discharging typical 1-µF output capacitance in under 100 µs. It eliminates floating outputs during power-down sequences-critical for preventing latch-up or undefined states in downstream logic and analog circuits.
Is the TPS78401BQWDRBRQ1 compatible with standard SMT reflow profiles for automotive PCB assembly?
Yes, the TPS78401BQWDRBRQ1's wettable flank VSON-8 package is qualified for standard lead-free (SnAgCu) reflow profiles per J-STD-020, including peak temperatures up to 260°C. The wettable flanks enable automated optical inspection (AOI) of solder fillets-a key requirement for automotive manufacturing process validation and zero-defect quality targets.
TPS78401BQWDRBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.32V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB ~ 30dB (1kHz ~ 1MHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, UVLO
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-SON (3x3)
TPS78401BQWDRBRQ1 FAQ
1.How can I place an order for TPS78401BQWDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS78401BQWDRBRQ1 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 TPS78401BQWDRBRQ1 reliable?
The price and inventory of TPS78401BQWDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS78401BQWDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS78401BQWDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS78401BQWDRBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS78401BQWDRBRQ1?
TPS78401BQWDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS78401BQWDRBRQ1 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 TPS78401BQWDRBRQ1?
For technical support, including TPS78401BQWDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS78401BQWDRBRQ1 requirements.
6.How does Aetrix verify that TPS78401BQWDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS78401BQWDRBRQ1 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 TPS78401BQWDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS78401BQWDRBRQ1?
All TPS78401BQWDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS78401BQWDRBRQ1, 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 TPS78401BQWDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS78401BQWDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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