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Texas Instruments TPS62918RPYR
- Part No.:
- TPS62918RPYR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
TPS62918RPYR.pdf
- Description:
- IC REG BUCK ADJ 8A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,939
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Product details
Overview
TPS62918RPYR from Texas Instruments is a 3V–17V input, 8A synchronous buck converter with integrated ferrite-bead filter compensation, 2.2/1.4/1.0 MHz fixed-frequency peak-current-mode control, <10 µVRMS output ripple after second-stage filtering, and ±1% output voltage accuracy over –40°C to 150°C junction temperature - deployed in radar power rails and high-speed ADC supply chains.
For engineers reviewing the TPS62918RPYR datasheet, TPS62918RPYR pinout, TPS62918RPYR application, or TPS62918RPYR equivalent, key selection criteria include its 25 mΩ/7 mΩ RDS(on) FETs, NR/SS-configurable soft-start and low-frequency noise suppression, spread-spectrum modulation support via S-CONF resistor, and PG output with 95% VFB threshold for precise rail sequencing.
Technical Context
The TPS62918RPYR implements fixed-frequency peak-current-mode control with selectable 2.2 MHz, 1.4 MHz, or 1.0 MHz switching, synchronized externally via EN/SYNC pin. Its internal loop compensation supports stability with up to 50 nH external ferrite-bead inductance in a second-stage L-C filter.
Low-noise operation stems from filtered internal reference (via NR/SS capacitor) and optional random spread-spectrum modulation (±10% fSW), reducing mixing spurs in FFT-based ADC systems. Output discharge (RDIS ≈ 7 Ω at 1.2 V) and precise enable threshold (1.01 V typ.) enable controlled power-up/down sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 8 A continuous - supports high-power analog signal chains without parallel converters. |
| Input voltage range | 3.0 V to 17 V - compatible with 5 V, 12 V, and intermediate industrial bus rails. |
| Output voltage range | 0.8 V to 5.5 V - covers core voltages for FPGAs, ADCs, SerDes, and RF ICs. |
| Switching frequency | 2.2 / 1.4 / 1.0 MHz (configurable via S-CONF) - enables compact magnetics and EMI filtering trade-offs. |
| Output ripple | <10 µVRMS after ferrite-bead L-C filter - meets stringent noise requirements of jitter-sensitive clocking and 16+ bit ADCs. |
| RDS(on) | 25 mΩ (HS), 7 mΩ (LS) - minimizes conduction loss and thermal rise at full load. |
| PSRR | >65 dB up to 100 kHz - suppresses upstream supply noise before sensitive analog loads. |
| Operating temp. | –40°C to 150°C junction - qualified for aerospace, defense, and under-hood industrial use. |
Pinout & Package
TPS62918RPYR uses a 14-pin VQFN-HR (RPY) package, 2.5 mm × 3.0 mm, 0.5 mm pitch, with exposed thermal pad. Pin 1 is PSNS; pins 9 and 11 are PGND; pins 8 and 12 are VIN; dual SW pins (10 and 13) connect to inductor windings; EN/SYNC (pin 7) serves dual enable/synchronization function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PSNS (1) | Power sense ground | Direct connection to PCB GND plane - critical for accurate current sensing and noise isolation. |
| VIN (8,12) | Input power supply | Dual high-current paths reduce IR drop and improve thermal distribution across input stage. |
| PGND (9,11) | Power ground return | Separate low-impedance return path for switch node current - prevents coupling into sensitive analog sections. |
| SW (10,13) | Power switch node | Two dedicated switch terminals - accommodate interleaved or split inductor layouts for reduced EMI. |
| EN/SYNC (7) | Enable & synchronization input | Configurable logic threshold (1.01 V typ.); accepts external clock for system-wide timing alignment. |
| BOOT (14) | High-side gate driver supply | Requires ceramic capacitor to SW - enables efficient 25 mΩ HS FET drive with minimal charge pump loss. |
| NR/SS (2) | Noise reduction / soft-start | Capacitor value sets both low-frequency noise floor and startup ramp time - e.g., 470 nF = ~5 ms soft-start. |
| FB (3) | Feedback input | Resistor-divider referenced to 0.8 V internal reference - enables precise output regulation independent of load or line variation. |
| PG (5) | Open-drain power-good | Asserts high-Z when VOUT ≥ 95% target - used for sequenced enable of downstream converters or FPGA configuration. |
| S-CONF (6) | Smart configuration | Resistor-programmed pin setting switching frequency, spread spectrum, output discharge, and sync range - no firmware required. |
| VO (4) | Output voltage sense | Connects directly after first inductor - ensures regulation point excludes first-stage ripple, enabling accurate post-filter control. |
Key Features
| Feature | Design Value |
|---|---|
| Ferrite-bead filter compensation | Internal loop stable with up to 50 nH external filter inductance - eliminates need for external compensation networks. |
| Low 1/f noise | <20 µVRMS (100 Hz–100 kHz) - achieved via NR/SS capacitor filtering of internal reference, matching LDO-grade spectral purity. |
| Spread spectrum modulation | Random ±10% fSW dithering - reduces discrete switching spurs in FFT-based systems like radar receivers and high-speed digitizers. |
| Precise enable threshold | 1.01 V typical rising threshold with 500 kΩ internal pulldown - enables user-defined UVLO and exact multi-rail power sequencing. |
| Power-good output | Open-drain PG with 95% VFB assertion threshold and 8 µs deglitch - provides reliable system-level power status for FPGA/CPU boot control. |
| Adjustable soft start | Capacitor-controlled ramp (e.g., 470 nF → 5 ms) - prevents inrush current and avoids undershoot on sensitive analog supplies. |
Applications
| Radar Transceiver Power | High-Speed ADC Core Supply |
|---|---|
|
Use Scenario: Powering GaN-based T/R modules and low-noise receive chains in phased-array radar systems. IC Role / Device Role / Timing Role: Primary 1.2 V/8 A supply with sub-10 µVRMS ripple after ferrite-bead filtering - replaces cascaded buck-LDO stages. Use Value: Enables >70 dB SFDR in 12-bit+ ADCs by eliminating switching artifacts that degrade dynamic range and phase coherence. |
Use Scenario: Delivering clean 1.8 V core voltage to 2.5 GSPS ADCs in test equipment and communications infrastructure. IC Role / Device Role / Timing Role: Low-noise buck regulator with NR/SS-configurable soft-start and spread-spectrum modulation - synchronizes with sampling clock. Use Value: Reduces mixing spurs by >30 dB versus standard buck converters, preserving ENOB in wideband digitization. |
| Avionics Clock Distribution | Medical Imaging Signal Chain |
|
Use Scenario: Generating ultra-low-noise 3.3 V supply for jitter cleaners and clock synthesizers in flight-critical avionics. IC Role / Device Role / Timing Role: Fixed-frequency (2.2 MHz) buck with PSRR >70 dB at 100 kHz - feeds low-phase-noise PLLs requiring stable VCC. Use Value: Limits integrated phase jitter to <100 fs RMS over 12 kHz–20 MHz, meeting DO-254 Class E timing integrity requirements. |
Use Scenario: Powering front-end amplifiers and precision DACs in MRI gradient control and ultrasound beamforming ASICs. IC Role / Device Role / Timing Role: 0.8 V–5.5 V programmable output with ±1% accuracy and thermal shutdown at 170°C - supports sealed-system reliability. Use Value: Maintains signal-to-noise ratio >90 dB across full operating temperature range, avoiding image artifacts from supply drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency, low-noise buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62916RPYR | 6 A output current, identical pinout and feature set - lower current rating, same thermal footprint and control architecture. | Used where peak load is ≤6 A; reduces BOM cost without redesigning layout or firmware. | Select when full 8 A headroom is unnecessary and thermal margin allows derating. |
| LM61480RQWR | 8 A, 3–36 V input, no integrated ferrite-bead compensation, higher 20 µVRMS noise baseline, no spread spectrum. | Targets general-purpose industrial power; lacks noise-performance features needed for ADC/radar applications. | Choose only if ferrite-bead filtering, sub-10 µVRMS ripple, or spur suppression are not required. |
Compared with TPS62918RPYR, TPS62916RPYR offers identical noise performance and layout compatibility at reduced current capacity, while LM61480RQWR trades low-noise capability for wider input range and lower cost - making TPS62918RPYR the sole option for noise-critical 8 A rails demanding ferrite-bead integration and spread-spectrum spur reduction.
Availability
TPS62918RPYR is available at Aetrix Electronics and suitable for radar transceivers, high-speed data acquisition systems, and avionics power management requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TPS62918RPYR 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 power management ICs, with decades of expertise in high-reliability power conversion.
The TPS6291x family was designed specifically for noise-sensitive applications replacing LDOs - targeting radar, medical imaging, and test equipment where DC/DC-induced spurs compromise signal integrity.
FAQ
What is the maximum supported ferrite-bead inductance for TPS62918RPYR?
The TPS62918RPYR supports external ferrite-bead inductance up to 50 nH while maintaining loop stability - verified in TI's SLVSG94C datasheet Section 5.3. This enables effective second-stage ripple attenuation without external compensation components. The device regulates after the ferrite bead (VO pin placement), ensuring tight output voltage accuracy despite filter losses. Always place VO directly after the first inductor and before the ferrite bead to preserve this control architecture.
Does TPS62918RPYR support synchronization to an external clock?
Yes, TPS62918RPYR supports external clock synchronization via the EN/SYNC pin (pin 7). When a logic-level clock signal (0.4 V–1.1 V low/high thresholds) is applied, the device locks to frequencies within ranges defined by the S-CONF resistor: 1.9–2.42 MHz (2.2 MHz mode), 1.2–1.6 MHz (1.4 MHz mode), or 0.9–1.2 MHz (1.0 MHz mode). Synchronization occurs automatically at startup; no register writes or configuration sequences are required.
How does the S-CONF pin configure TPS62918RPYR functionality?
The S-CONF pin (pin 6) configures TPS62918RPYR using a single external resistor - setting switching frequency (2.2/1.4/1.0 MHz), spread-spectrum modulation (on/off), output discharge (on/off), and sync range. Resistor values from 4.87 kΩ to 100 kΩ select distinct modes per Table 6-1 in the datasheet. Configuration is latched at power-up and cannot be changed dynamically - ensuring deterministic behavior in safety-critical systems.
What is the purpose of the NR/SS pin on TPS62918RPYR?
The NR/SS pin (pin 2) on TPS62918RPYR serves two simultaneous functions: it sets soft-start duration via an external capacitor (e.g., 470 nF = ~5 ms ramp), and reduces low-frequency output noise by filtering the internal voltage reference. Larger capacitors lower RMS noise (e.g., 2.2 µF yields ~27 µVRMS vs. 470 nF at ~26 µVRMS) but increase startup time. This dual role eliminates separate noise-filtering and sequencing components in space-constrained designs.
Can TPS62918RPYR operate with input voltage below 3.0 V?
No, TPS62918RPYR has a minimum recommended input voltage of 3.0 V per Section 5.3 of the datasheet. Its absolute maximum ratings allow down to –0.3 V, but operation below 3.0 V violates recommended conditions and may cause undervoltage lockout (UVLO) activation at 2.85–3.0 V. Below this threshold, the device disables and draws only 0.3–70 µA shutdown current - insufficient for functional regulation. For sub-3 V inputs, consider TI's TPS62864 or similar low-VIN converters.
TPS62918RPYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TPS6291x
- Package/Case:
- 14-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 8A
- Frequency - Switching:
- 1MHz, 1.4MHz, 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VQFN-HR (2.5x3)
TPS62918RPYR FAQ
1.How can I place an order for TPS62918RPYR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62918RPYR 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 TPS62918RPYR reliable?
The price and inventory of TPS62918RPYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62918RPYR is usually 5 days.
3.What payment methods are accepted for TPS62918RPYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62918RPYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62918RPYR?
TPS62918RPYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62918RPYR 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 TPS62918RPYR?
For technical support, including TPS62918RPYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62918RPYR requirements.
6.How does Aetrix verify that TPS62918RPYR is sourced from the original manufacturer or authorized distributors?
All TPS62918RPYR 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 TPS62918RPYR meets industry standards.
7.What is the process for return or replacement of TPS62918RPYR?
All TPS62918RPYR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62918RPYR, 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 TPS62918RPYR part is unused and in its original packaging.
Return procedure for TPS62918RPYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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