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Texas Instruments TPS78512BQWDRBRQ1
- Part No.:
- TPS78512BQWDRBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS78512BQWDRBRQ1.pdf
- Description:
- AUTOMOTIVE, 1-A, HIGH-ACCURACY,
- Quantity:
- Payment:
- Shipping:
Inventory:5,819
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Product details
Overview
TPS78512BQWDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage regulator delivering 1 A output at fixed 1.2 V with ±1.7% max accuracy, 315 mV max dropout at 1 A, 25 µA typical quiescent current, and 60 dB PSRR at 1 kHz - used for powering radar sensor analog front-ends and infotainment SoC core rails.
For engineers reviewing the TPS78512BQWDRBRQ1 datasheet, TPS78512BQWDRBRQ1 pinout, TPS78512BQWDRBRQ1 application, or TPS78512BQWDRBRQ1 equivalent, key selection criteria include automotive-grade thermal performance (–40°C to +125°C ambient), wettable flank VSON-8 package compatibility with automated optical inspection, ultra-low-noise operation (30 µVRMS), and active output discharge for safe power sequencing.
Technical Context
The TPS78512BQWDRBRQ1 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across 1 kHz–1 MHz. Its internal 1.2-V bandgap reference and error amplifier support tight regulation under fast load transients (10 µs settling time), while foldback current limiting reduces thermal stress during short-circuit events.
It integrates undervoltage lockout (UVLO) with 1.28–1.62 V rising threshold and 130 mV hysteresis, thermal shutdown at 170°C with 15°C hysteresis, and a 550 µs internal soft-start to limit inrush current - all critical for automotive power rail stability and functional safety compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±1.7% over –40°C to +125°C ambient - ensures stable core supply for automotive MCUs and DSPs without external feedback components. |
| Max Output Current | 1 A continuous - supports high-current digital loads including radar baseband processors and display controllers. |
| Dropout Voltage | 315 mV max at 1 A (VOUT = 1.2 V) - enables operation from 1.7-V input, compatible with post-regulation from buck converters or battery-sourced rails. |
| Quiescent Current | 25 µA typical - minimizes standby power loss in always-on vehicle modules such as telematics and ADAS sensors. |
| PSRR | 60 dB at 1 kHz, 45 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuits. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) - meets low-noise requirements for RF receivers, ADC references, and precision sensor signal chains. |
| Enable Threshold | VEN(HI) = 0.9 V min - supports direct interfacing with 1.2-V or 1.8-V logic-level microcontrollers without level-shifting. |
Pinout & Package
TPS78512BQWDRBRQ1 uses the wettable flank VSON-8 (DRB) package, 3.0 mm × 3.0 mm, with exposed thermal pad electrically connected to GND for enhanced thermal dissipation (RθJA = 59.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output | Delivers 1.2 V to load; requires ≥0.47 µF ceramic capacitor to GND for stability and transient response. |
| 2, 3, 4, 6 - NC | No-connect | Not internally bonded; recommended to connect to GND plane for improved thermal performance and EMI reduction. |
| 5 - GND | Ground reference | Primary return path for load current and control circuitry; must be low-impedance connection to PCB ground plane. |
| 7 - EN | Enable input | Active-high logic control; drives high (>0.9 V) to enable regulator, low (<0.3 V) to disable with active pulldown (100 Ω typical). |
| 8 - IN | Input supply | Accepts 1.7–6.0 V; requires ≥0.1 µF ceramic capacitor to GND placed adjacent to pin for high-frequency noise filtering. |
| Thermal Pad | Thermal & electrical GND | Electrically tied to GND; must be soldered to large copper area for thermal management and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Active output discharge | Internal pulldown circuit discharges OUT to GND within microseconds upon disable - prevents floating outputs and ensures deterministic power-down sequencing. |
| 550 µs internal soft-start | Controls VOUT ramp rate to reduce inrush current by >50% vs hard-start designs - allows smaller input capacitance and avoids triggering upstream current limits. |
| Foldback current limit | Transitions from brickwall (1.04–1.65 A) to foldback mode below 0.4×VOUT, limiting power dissipation during sustained shorts - improves reliability in harsh automotive environments. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical characterization - meets functional safety requirements for ASIL-B systems without additional derating. |
| Ultra-low noise (30 µVRMS) | Enables direct powering of noise-sensitive analog blocks (e.g., PLLs, ADCs, RF synthesizers) without external LDO post-filtering stages. |
Applications
| Automotive Radar Power Supply | Infotainment SoC Core Rail |
|---|---|
Use Scenario: Powers 77-GHz radar transceiver analog front-end and baseband processor in short-range radar modules. IC Role / Device Role / Timing Role: Primary 1.2-V core LDO supplying low-noise, high-PSRR bias to RF amplifiers and ADCs. Use Value: 30 µVRMS noise and 60 dB PSRR prevent phase noise degradation and spurious signal generation in radar IF paths. | Use Scenario: Supplies 1.2-V core voltage to application processors in automotive head units and digital instrument clusters. IC Role / Device Role / Timing Role: Post-regulator after buck converter, providing precise, low-ripple supply for CPU/GPU cores. Use Value: ±1.7% output accuracy and 10 µs load transient response maintain SoC stability during burst-mode processing. |
| Telematics Cellular Modem Rail | ADAS Camera Sensor Bias |
Use Scenario: Delivers regulated 1.2 V to LTE/5G modem baseband ICs in telematics control units (TCUs). IC Role / Device Role / Timing Role: Always-on LDO supporting low-power wake-up modes and cellular registration sequences. Use Value: 25 µA quiescent current extends battery backup runtime during vehicle sleep cycles without compromising start-up speed. | Use Scenario: Provides clean 1.2-V bias to high-resolution CMOS image sensors and ISP pipelines in surround-view camera systems. IC Role / Device Role / Timing Role: Low-noise analog supply for pixel readout and analog signal conditioning stages. Use Value: Active output discharge ensures rapid, controlled sensor power-down to prevent image corruption during hot-plug or fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B8712QKVURQ1 | Higher IQ (35 µA typ), lower dropout (200 mV @ 1 A), no active discharge, TO-252-5 package | Lacks active output discharge and soft-start; better suited for thermally constrained layouts requiring lower RθJA (31.6°C/W) | Select when thermal performance outweighs sequencing control needs and board space permits larger TO-252 footprint. |
| NCP1117ST12T3G | Non-automotive grade, ±2% accuracy, 1.2-V fixed, 1.2-V dropout @ 1 A, SOT-223 package | Not AEC-Q100 qualified; lacks UVLO, thermal shutdown, and PSRR optimization for automotive noise environments | Only suitable for non-safety-critical industrial or consumer prototypes where automotive qualification is not required. |
Compared with TPS7B8712QKVURQ1 and NCP1117ST12T3G, the TPS78512BQWDRBRQ1 uniquely combines AEC-Q100 Grade 1 qualification, active discharge, 550 µs soft-start, and 30 µVRMS noise - making it the only option qualified for ASIL-B radar and infotainment core rail applications requiring deterministic power sequencing and ultra-low noise.
Availability
TPS78512BQWDRBRQ1 is available at Aetrix Electronics and suitable for automotive head units, hybrid instrument clusters, and medium-range radar systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TPS78512BQWDRBRQ1 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 deep expertise in automotive-grade power management solutions.
The TPS785-Q1 product line was designed specifically for demanding automotive subsystems - delivering high-accuracy, low-noise, and robust protection features required for radar, telematics, and digital cockpit applications.
FAQ
What is the maximum input voltage rating for the TPS78512BQWDRBRQ1?
The TPS78512BQWDRBRQ1 has an absolute maximum input voltage rating of 6.5 V, with recommended operating range from 1.7 V to 6.0 V. Exceeding 6.5 V risks permanent damage. For reliable operation in automotive environments with load dump transients, external clamping or pre-regulation is advised when VIN may exceed 6.0 V.
Does the TPS78512BQWDRBRQ1 require an external feed-forward capacitor?
No, the TPS78512BQWDRBRQ1 does not require an external feed-forward capacitor for stability. The device is internally compensated and remains stable with a minimum 0.47-µF ceramic output capacitor. A feed-forward capacitor (up to 100 nF) is optional and may improve PSRR at higher frequencies but is not necessary for basic operation.
How does the active output discharge function work on the TPS78512BQWDRBRQ1?
When the EN pin is driven low, the TPS78512BQWDRBRQ1 activates an internal 100-Ω pulldown resistor between OUT and GND, discharging the output capacitor rapidly. This prevents floating voltages that could cause latch-up or undefined states in downstream logic, ensuring safe, repeatable power-down behavior in automotive systems with strict sequencing requirements.
What is the thermal shutdown behavior of the TPS78512BQWDRBRQ1?
The TPS78512BQWDRBRQ1 triggers thermal shutdown at 170°C junction temperature and resets at 155°C (15°C hysteresis). During sustained overload, it cycles between shutdown and restart until the fault condition clears. This protects against catastrophic failure while maintaining visibility into thermal stress conditions via external monitoring of output collapse and recovery timing.
Can the TPS78512BQWDRBRQ1 be used with ceramic output capacitors below 1 µF?
Yes - the TPS78512BQWDRBRQ1 is stable with a minimum effective output capacitance of 0.47 µF. A 1-µF or larger ceramic capacitor is recommended for optimal transient response, but 0.47 µF meets stability requirements per the datasheet. ESR must remain below 1 Ω, and X7R/X5R dielectrics are preferred for temperature stability.
TPS78512BQWDRBRQ1 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:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.725V @ 1A
- Current - Output:
- 1A
- 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)
TPS78512BQWDRBRQ1 FAQ
1.How can I place an order for TPS78512BQWDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS78512BQWDRBRQ1 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 TPS78512BQWDRBRQ1 reliable?
The price and inventory of TPS78512BQWDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS78512BQWDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS78512BQWDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS78512BQWDRBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS78512BQWDRBRQ1?
TPS78512BQWDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS78512BQWDRBRQ1 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 TPS78512BQWDRBRQ1?
For technical support, including TPS78512BQWDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS78512BQWDRBRQ1 requirements.
6.How does Aetrix verify that TPS78512BQWDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS78512BQWDRBRQ1 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 TPS78512BQWDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS78512BQWDRBRQ1?
All TPS78512BQWDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS78512BQWDRBRQ1, 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 TPS78512BQWDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS78512BQWDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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