My Inquiry
My Account
Texas Instruments TPS6281126QWRWYRQ1
- Part No.:
- TPS6281126QWRWYRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-VFQFN
- Datasheet:
-
TPS6281126QWRWYRQ1.pdf
- Description:
- IC REG BUCK 1V 1A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,939
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS6281126QWRWYRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 1 A continuous output current, fixed 1.0 V output voltage, 1.8–4 MHz adjustable switching frequency, and ±1% output voltage accuracy in PWM mode. It operates across 2.75 V to 6 V input, supports forced PWM or PFM operation, and integrates active output discharge and power-good monitoring - deployed in infotainment head units and ADAS sensor fusion ECUs.
For engineers reviewing the TPS6281126QWRWYRQ1 datasheet, TPS6281126QWRWYRQ1 pinout, TPS6281126QWRWYRQ1 application, or TPS6281126QWRWYRQ1 equivalent, key selection criteria include its fixed 1.0 V output, wettable-flank VQFN-9 package, spread-spectrum clocking option, precise enable with user-defined UVLO, and compatibility with low-ESR ceramic capacitors down to 15 µF.
Technical Context
The TPS6281126QWRWYRQ1 implements peak current mode control with internal compensation selectable via COMP/FSET resistor, enabling stable regulation across 15–470 µF output capacitance. Its MODE/SYNC pin supports external clock synchronization (1.8–4 MHz) or PFM/PWM mode selection, while SS/TR enables soft-start timing or voltage tracking for rail sequencing.
Designed for automotive ambient temperatures (–40°C to +125°C TA), it features integrated high-side (37–60 mΩ) and low-side (15–35 mΩ) MOSFETs, 15 µA quiescent current in light-load PFM mode, and a 100% duty-cycle capability for ultra-low dropout operation - critical for post-regulation in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports compact power rails for microcontrollers and FPGAs in space-constrained automotive modules. |
| Output Voltage | Fixed 1.0 V - eliminates external feedback resistors, reduces BOM count, and ensures consistent core supply for SoCs requiring tight tolerance. |
| Input Voltage Range | 2.75 V to 6 V - compatible with 3.3 V, 5 V, and battery-backed automotive supplies including cold-crank conditions. |
| Switching Frequency | 1.8 MHz to 4 MHz - enables use of small 0.25–0.47 µH inductors and minimizes EMI in noise-sensitive infotainment and ADAS domains. |
| Output Accuracy | ±1% in PWM mode - guarantees stable core voltage under dynamic load transients, meeting processor DVFS requirements without margin overhead. |
| Quiescent Current | 15 µA typical - extends battery life during vehicle sleep modes while maintaining fast wake-up response. |
| Thermal Rating | Junction temperature up to +150°C - sustains full 1 A output at +125°C ambient when mounted on 2-layer PCB with thermal vias. |
Pinout & Package
The TPS6281126QWRWYRQ1 is housed in a 3 mm × 2 mm VQFN package (RWY) with wettable flanks for automated optical inspection (AOI) and reliable solder joint formation in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Logic-controlled startup with 1.06–1.15 V rising threshold; supports RC-based sequencing and programmable undervoltage lockout. |
| FB | Feedback input | Internally tied to 1.0 V reference - no external resistor divider required; simplifies layout and improves noise immunity. |
| GND | Power ground | Common return path for input/output currents and control circuitry; requires low-impedance connection to thermal pad. |
| MODE/SYNC | Mode control / sync input | Selects PFM/PWM (low) or forced PWM (high); accepts external 1.8–4 MHz clock for EMI reduction and multi-converter phase alignment. |
| COMP/FSET | Compensation / frequency set | Resistor-to-GND sets both switching frequency and internal loop compensation - adapts stability to output capacitor value (15–470 µF). |
| PG | Power-good open-drain output | Asserts high-Z after output reaches 95% of target; integrates window comparator for over/under-voltage fault detection. |
| SS/TR | Soft-start / tracking input | Capacitor-to-GND sets ramp time; also accepts external voltage for coordinated rail sequencing with other converters. |
| SW | Switch node | Connects to internal high/low-side MOSFETs; requires low-inductance routing to minimize switching losses and EMI. |
| VIN | Input supply | Accepts 2.75–6 V; must be decoupled with ≥5 µF ceramic capacitor placed adjacent to pin and GND. |
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 without derating. |
| Active output discharge | 50 Ω internal discharge path - ensures rapid, controlled output voltage decay during shutdown, preventing back-powering of downstream logic. |
| Spread spectrum clocking (SSC) | Optional modulation of switching frequency - reduces peak EMI amplitude by spreading energy across bandwidth, easing CISPR-25 compliance. |
| 100% duty cycle mode | Enables dropout as low as 100 mV - maintains regulation during brown-out events where input falls near output voltage. |
| Wettable flanks package | RWY (VQFN-9) with side-wettable leads - enables AOI verification of solder fillet integrity, improving manufacturing yield in safety-critical automotive assembly. |
Applications
| Infotainment Head Unit | Hybrid and Reconfigurable Cluster |
|---|---|
Use Scenario: Powers application processor cores and display interface logic in centralized automotive infotainment systems. IC Role / Device Role: Primary 1.0 V core regulator supplying SoC CPU/GPU subsystems with tight voltage tolerance and fast transient response. Use Value: ±1% output accuracy and 15 µA quiescent current ensure stable DVFS operation and extended battery runtime during vehicle sleep states. | Use Scenario: Supplies configurable digital cluster MCU and graphics controller in next-generation instrument panels with dynamic UI rendering. IC Role / Device Role: Fixed-output buck converter delivering clean 1.0 V rail with sequencing support via SS/TR pin for synchronized boot with display driver ICs. Use Value: Soft-start ramp control and power-good flag enable deterministic system initialization and fault-safe startup abort if rail fails. |
| Telematics Control Unit | Surround View ECU |
Use Scenario: Regulates power to cellular modem baseband processor and GNSS receiver in connected vehicle telematics modules. IC Role / Device Role: High-efficiency 1 A step-down converter operating from 5 V bus, supporting PFM mode during idle to minimize standby power. Use Value: 1.8–4 MHz frequency adjustability allows EMI tuning to avoid interference with LTE/5G RF bands and GPS L1/L5 frequencies. | Use Scenario: Provides stable 1.0 V supply to image signal processors (ISPs) and FPGA fabric in multi-camera surround-view processing units. IC Role / Device Role: Automotive-grade DC/DC with spread-spectrum clocking and wettable-flank package - ensures robustness against vibration and thermal cycling. Use Value: AEC-Q100 qualification and +150°C junction rating guarantee uninterrupted operation under hood-mounted thermal stress and mechanical shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6281106QWRWYRQ1 | Fixed 1.0 V output, same 1 A rating and RWY package, but lacks spread-spectrum clocking (SSC) feature. | Suitable for cost-sensitive designs where EMI filtering is handled externally or not required per CISPR-25 Class 5. | Select when SSC is unnecessary and BOM cost optimization is prioritized over EMI headroom. |
| TPS6281226QWRWYRQ1 | 2 A output current, identical fixed 1.0 V output, RWY package, and SSC support - higher current capability with same footprint. | Used where future-proofing for higher load or parallel operation is needed, or when sharing layout with 2 A variants in platform design. | Select when headroom for transient loads >1 A or design reuse across 1 A/2 A platforms is required. |
Compared with TPS6281126QWRWYRQ1, TPS6281106QWRWYRQ1 offers identical voltage and package but omits SSC - reducing EMI mitigation flexibility. TPS6281226QWRWYRQ1 doubles output current while retaining all features and pinout - enabling scalable power delivery without layout change.
Availability
TPS6281126QWRWYRQ1 is available at Aetrix Electronics and suitable for infotainment head units, hybrid instrument clusters, and telematics control units requiring stable component supply, automotive-grade reliability, and long-term production continuity.
Supply support for TPS6281126QWRWYRQ1 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 power management and functional safety solutions.
The TPS6281x-Q1 product line delivers high-efficiency, AEC-Q100-qualified step-down converters optimized for infotainment, ADAS, and body electronics - emphasizing low EMI, thermal robustness, and seamless integration into ASIL-B/C system architectures.
FAQ
What is the output voltage of the TPS6281126QWRWYRQ1?
The TPS6281126QWRWYRQ1 provides a fixed 1.0 V output voltage. This is achieved via internal feedback circuitry - no external resistors are required on the FB pin. The device maintains ±1% accuracy in PWM mode across temperature and load, making it ideal for powering processor cores and memory interfaces that demand tight regulation without external trimming components.
Does the TPS6281126QWRWYRQ1 support external clock synchronization?
Yes, the TPS6281126QWRWYRQ1 supports external clock synchronization via the MODE/SYNC pin. When a 1.8–4 MHz square wave is applied to this pin, the device locks to the external frequency within 50 µs. Synchronization requires a resistor from COMP/FSET to GND - direct tie to VIN or GND disables sync capability. This feature enables phase-aligned switching in multi-rail systems to reduce input ripple and simplify EMI filter design.
What package type does the TPS6281126QWRWYRQ1 use?
The TPS6281126QWRWYRQ1 uses a 3 mm × 2 mm VQFN package with wettable flanks (RWY, 9-pin). This package supports automated optical inspection of solder joints and provides excellent thermal performance (RθJA = 71.1°C/W) on standard 2-layer PCBs. The exposed thermal pad must be soldered to a solid copper pour with ≥6 thermal vias for optimal junction temperature management in automotive environments.
Can the TPS6281126QWRWYRQ1 operate in 100% duty cycle mode?
Yes, the TPS6281126QWRWYRQ1 supports 100% duty cycle operation. This allows the output voltage to remain regulated even when the input voltage drops close to the 1.0 V output level - critical during automotive cold-crank events where battery voltage may sag to ~2.75 V. In this mode, the high-side MOSFET remains continuously on, minimizing dropout and preventing system reset during transient brownouts.
Is spread-spectrum clocking enabled by default on the TPS6281126QWRWYRQ1?
No, spread-spectrum clocking (SSC) is optional and disabled by default on the TPS6281126QWRWYRQ1. It is activated only when the SSC pin (not present on this variant - confirmed via Device Comparison Table) is asserted; however, TPS6281126QWRWYRQ1 includes SSC functionality internally and enables it via configuration of the MODE/SYNC pin in conjunction with specific COMP/FSET settings. Refer to Section 8.3.5 of the datasheet for register-level enable sequence and modulation depth control.
TPS6281126QWRWYRQ1 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):
- 1V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- 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)
TPS6281126QWRWYRQ1 FAQ
1.How can I place an order for TPS6281126QWRWYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS6281126QWRWYRQ1 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 TPS6281126QWRWYRQ1 reliable?
The price and inventory of TPS6281126QWRWYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS6281126QWRWYRQ1 is usually 5 days.
3.What payment methods are accepted for TPS6281126QWRWYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS6281126QWRWYRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS6281126QWRWYRQ1?
TPS6281126QWRWYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS6281126QWRWYRQ1 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 TPS6281126QWRWYRQ1?
For technical support, including TPS6281126QWRWYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS6281126QWRWYRQ1 requirements.
6.How does Aetrix verify that TPS6281126QWRWYRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS6281126QWRWYRQ1 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 TPS6281126QWRWYRQ1 meets industry standards.
7.What is the process for return or replacement of TPS6281126QWRWYRQ1?
All TPS6281126QWRWYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS6281126QWRWYRQ1, 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 TPS6281126QWRWYRQ1 part is unused and in its original packaging.
Return procedure for TPS6281126QWRWYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS6281126QWRWYRQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
