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Texas Instruments TPS6281208QWRWYRQ1
- Part No.:
- TPS6281208QWRWYRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-VFQFN
- Datasheet:
-
TPS6281208QWRWYRQ1.pdf
- Description:
- IC REG BUCK 1.1V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS6281208QWRWYRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 2 A continuous output current, with fixed 1.1 V output voltage, 1.8–4 MHz adjustable switching frequency, and ±1% feedback voltage accuracy in PWM mode. It operates across 2.75 V to 6 V input range and supports forced PWM or PWM/PFM operation for high efficiency across load conditions - deployed in infotainment head units and ADAS sensor fusion ECUs.
For engineers reviewing the TPS6281208QWRWYRQ1 datasheet, TPS6281208QWRWYRQ1 pinout, TPS6281208QWRWYRQ1 application, or TPS6281208QWRWYRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal metrics (RθJA = 71.1°C/W), real-world soft-start and sequencing capability via SS/TR, and precise enable threshold (1.1 V rising) for automotive rail sequencing.
Technical Context
The TPS6281208QWRWYRQ1 implements peak current mode control with internal loop compensation selectable via resistor on COMP/FSET, enabling stable regulation with ceramic output capacitors as low as 15 µF (for VOUT ≥ 1 V). Its 1.1 V fixed output is internally referenced to a 0.6 V feedback node with 1.1 V = 0.6 V × (1 + R1/R2), eliminating external resistive divider.
It features active output discharge (50 Ω typical), 100% duty cycle capability for low-dropout operation, and spread-spectrum clocking support (enabled via configuration). The MODE/SYNC pin enables external synchronization (1.8–4 MHz) when a resistor is present on COMP/FSET, and provides PFM/PWM mode selection via logic level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A continuous - supports high-ambient-temperature operation in automotive clusters and telematics ECUs. |
| Input Voltage Range | 2.75 V to 6 V - compatible with 3.3 V, 5 V, and battery-supplied automotive rails including cold-crank transients down to 2.75 V. |
| Output Voltage | Fixed 1.1 V - internally trimmed, ±1% accuracy in PWM mode; eliminates external feedback resistors and layout sensitivity. |
| Quiescent Current | 15 µA typical - enables ultra-low-power standby modes in always-on automotive subsystems. |
| Switching Frequency | Adjustable 1.8–4 MHz - allows EMI optimization and inductor size reduction; supports external sync for multi-rail coherence. |
| Thermal Resistance | RθJA = 71.1°C/W - validated for 3 mm × 2 mm VQFN-RWY package with wettable flanks and standard PCB copper pour. |
| Power-Good Output | Open-drain PG with window comparator - asserts after soft-start completion and monitors ±5% VFB deviation for reliable system sequencing. |
Pinout & Package
The TPS6281208QWRWYRQ1 is housed in a 3 mm × 2 mm, 9-pin VQFN package (RWY) with wettable flanks for automated optical inspection (AOI) and robust solder-joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 8) | Enable input | Logic-controlled startup; 1.1 V rising threshold enables precise undervoltage lockout and power-rail sequencing. |
| FB (Pin 5) | Feedback input | Internally connected to 1.1 V output divider - tied directly to VOUT; no external resistors required. |
| GND (Pin 4) | Ground reference | Primary return path for power and control circuits; must be low-inductance connection to minimize noise coupling. |
| MODE/SYNC (Pin 1) | Mode control / sync input | Pull-low for PFM/PWM auto-mode; pull-high for forced PWM; accepts external 1.8–4 MHz clock for synchronized switching. |
| COMP/FSET (Pin 7) | Compensation & frequency set | Resistor-to-GND sets both switching frequency and internal compensation; tied to GND/VIN for fixed 2.25 MHz operation. |
| PG (Pin 9) | Power-good output | Open-drain status signal indicating regulated output within ±5% window; used for downstream enable or fault reporting. |
| SS/TR (Pin 6) | Soft-start / tracking input | Capacitor-to-GND sets ramp time; also accepts external voltage for supply tracking during power-up sequencing. |
| SW (Pin 3) | Switch node | Connection to internal high-side/low-side MOSFETs; requires low-inductance layout and proper snubbing for EMI control. |
| VIN (Pin 2) | Input supply | Primary power input; requires local 10 µF ceramic capacitor placed adjacent to pin for high-frequency decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and lifetime requirements for front-end electronics. |
| Active output discharge | 50 Ω internal discharge path - ensures rapid VOUT collapse during shutdown, preventing back-powering of downstream circuitry. |
| Adjustable soft-start & tracking | SS/TR pin supports programmable ramp time (100–200 µs) and external voltage tracking - enables precise multi-rail sequencing in infotainment systems. |
| 100% duty-cycle operation | Enables dropout < 100 mV at full load - critical for maintaining 1.1 V output during low-input transients (e.g., 3.3 V rail sag). |
| Spread-spectrum clocking | Configurable via pin strap or register - reduces peak EMI amplitude by spreading fundamental switching energy across 100 kHz bandwidth. |
Applications
| Infotainment Head Unit | Hybrid Reconfigurable Cluster |
|---|---|
|
Use Scenario: Powering SoC core rails and GPU memory interfaces in centralized automotive infotainment platforms. IC Role / Device Role / Timing Role: Primary 1.1 V point-of-load regulator supplying CPU/GPU cores with tight voltage tolerance and fast transient response. Use Value: ±1% output accuracy and 2 A capability ensure stable operation under dynamic load steps up to 1.5 A/µs without brownout. |
Use Scenario: Supplying configurable display controller ICs and FPGA-based graphics processors in digital instrument clusters. IC Role / Device Role / Timing Role: Fixed-output buck converter providing clean, sequenced 1.1 V supply synchronized with other rails via MODE/SYNC pin. Use Value: External synchronization support enables phase-aligned switching across multiple TPS6281x-Q1 devices, reducing system-level ripple summation. |
| Telematics Control Unit | Surround View ECU |
|
Use Scenario: Delivering regulated 1.1 V to cellular modem baseband processors and GNSS receivers in always-connected TCUs. IC Role / Device Role / Timing Role: Low-quiescent-current (15 µA) buck regulator enabling efficient battery-backed operation during vehicle sleep modes. Use Value: Ultra-low IQ extends battery hold-up time during ignition-off states while maintaining fast wake-up response via precise EN threshold. |
Use Scenario: Powering image signal processors (ISPs) and MIPI CSI-2 serializer ICs in multi-camera surround-view processing modules. IC Role / Device Role / Timing Role: High-efficiency, EMI-optimized 1.1 V supply with spread-spectrum clocking to avoid interference with high-speed video data lanes. Use Value: Adjustable 1.8–4 MHz switching frequency allows tuning to avoid sensitive frequency bands (e.g., 2.4 GHz Wi-Fi or radar bands). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6281220QWRWYRQ1 | Same 2 A rating and RWY package, but includes spread-spectrum clocking (SSC) enabled by default; fixed 1.1 V output. | Preferred where EMI compliance is critical (e.g., near RF receivers); SSC adds ~150 mVpp output ripple in some conditions. | Select when FCC/CE radiated emissions testing shows marginal margin; identical pinout and layout compatibility. |
| TPS6281206QWRWYRQ1 | Same 2 A rating and RWY package, but fixed 1.0 V output; otherwise identical electrical specs and features. | Suitable for SoCs requiring 1.0 V core voltage (e.g., certain ARM Cortex-A72 implementations); not interchangeable for 1.1 V loads. | Choose only if target ASIC/FPGA explicitly specifies 1.0 V - verify VFB tolerance and load regulation match system requirements. |
Compared with TPS6281208QWRWYRQ1, TPS6281220QWRWYRQ1 adds mandatory spread-spectrum operation for EMI reduction but increases design complexity for noise-sensitive analog sections, while TPS6281206QWRWYRQ1 offers identical performance at 1.0 V - making it a direct functional alternative only when voltage requirement aligns.
Availability
TPS6281208QWRWYRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS sensor fusion, and telematics applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TPS6281208QWRWYRQ1 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-grade power management solutions, with decades of automotive qualification expertise.
The TPS6281x-Q1 product line is engineered specifically for automotive power rails demanding high efficiency, small footprint, AEC-Q100 reliability, and advanced features like sequencing, spread spectrum, and functional safety support.
FAQ
What is the output voltage of the TPS6281208QWRWYRQ1?
The TPS6281208QWRWYRQ1 delivers a fixed 1.1 V output voltage. This value is factory-trimmed and internally referenced to the 0.6 V feedback node, eliminating the need for external resistive dividers. Output voltage accuracy is ±1% in PWM mode across –40°C to +125°C ambient temperature, ensuring stable core supply for automotive SoCs and FPGAs.
Does the TPS6281208QWRWYRQ1 support external synchronization?
Yes, the TPS6281208QWRWYRQ1 supports external synchronization via the MODE/SYNC pin, but only when a resistor is connected from COMP/FSET to GND. In that configuration, the device accepts a 1.8–4 MHz external clock signal applied to MODE/SYNC, enabling phase-coherent switching across multiple rails. If COMP/FSET is tied directly to GND or VIN, external sync is disabled.
What package type and thermal performance does the TPS6281208QWRWYRQ1 use?
The TPS6281208QWRWYRQ1 uses a 3 mm × 2 mm, 9-pin VQFN package (RWY) with wettable flanks. Its thermal resistance is RθJA = 71.1°C/W under standard JEDEC 2-layer board conditions. Junction-to-board (RθJB) is 16.4°C/W, supporting reliable 2 A operation at +105°C ambient with appropriate PCB copper area.
How does the soft-start function work on the TPS6281208QWRWYRQ1?
The TPS6281208QWRWYRQ1 implements soft-start via the SS/TR pin: connecting a capacitor (e.g., 4.7 nF) from SS/TR to GND sets a typical ramp time of 100–200 µs to 95% of 1.1 V output. This limits inrush current and prevents input rail droop. The same pin also supports voltage tracking for coordinated power-up with other supplies.
Is the TPS6281208QWRWYRQ1 qualified for automotive use?
Yes, the TPS6281208QWRWYRQ1 is AEC-Q100 qualified for Grade 1 operation (–40°C to +125°C ambient), with full automotive PPAP documentation, extended temperature validation, and failure-mechanism testing per TI's automotive quality standards. It also supports functional safety development with FMEDA reports and safety manuals available upon request.
TPS6281208QWRWYRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-VFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.75V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.1V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 1.8MHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (3x2)
TPS6281208QWRWYRQ1 FAQ
1.How can I place an order for TPS6281208QWRWYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS6281208QWRWYRQ1 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 TPS6281208QWRWYRQ1 reliable?
The price and inventory of TPS6281208QWRWYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS6281208QWRWYRQ1 is usually 5 days.
3.What payment methods are accepted for TPS6281208QWRWYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS6281208QWRWYRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS6281208QWRWYRQ1?
TPS6281208QWRWYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS6281208QWRWYRQ1 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 TPS6281208QWRWYRQ1?
For technical support, including TPS6281208QWRWYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS6281208QWRWYRQ1 requirements.
6.How does Aetrix verify that TPS6281208QWRWYRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS6281208QWRWYRQ1 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 TPS6281208QWRWYRQ1 meets industry standards.
7.What is the process for return or replacement of TPS6281208QWRWYRQ1?
All TPS6281208QWRWYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS6281208QWRWYRQ1, 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 TPS6281208QWRWYRQ1 part is unused and in its original packaging.
Return procedure for TPS6281208QWRWYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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