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Texas Instruments TPS54974PWPR
- Part No.:
- TPS54974PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54974PWPR.pdf
- Description:
- IC REG BUCK ADJ 9A 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,417
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Product details
Overview
TPS54974PWPR from Texas Instruments is a dual-input synchronous buck PWM converter with integrated 15-mΩ high- and low-side MOSFETs, delivering up to 9 A continuous output current at 1.8 V with 0.891 V internal reference accuracy and adjustable 280–700 kHz switching frequency. It operates from separate 2.5 V (PVIN) and 3.3 V (VIN) input rails and is used for point-of-load regulation in FPGAs and DSPs.
For engineers reviewing the TPS54974PWPR datasheet, TPS54974PWPR pinout, TPS54974PWPR application, or TPS54974PWPR equivalent, this device requires attention to dual-rail sequencing, external compensation network design, thermal pad soldering per PowerPAD™ layout guidelines, and peak-current-limit-based overload protection behavior.
Technical Context
The TPS54974PWPR implements a voltage-mode PWM control architecture with an externally compensated error amplifier (90–110 dB open-loop gain, 3–5 MHz unity-gain bandwidth) and adaptive dead-time logic to prevent shoot-through. Its dual-input structure isolates the bias regulator (VIN) from the power stage (PVIN), enabling independent 3.3 V and 2.5 V supply domains.
It integrates undervoltage lockout referenced to VIN (2.95 V start, 2.8 V stop), thermal shutdown at 135–165 °C, and a 3.35 ms internal slow-start ramp. The PH node supports up to 16 A peak current, and the COMP pin drives Type-3 compensation networks for stable 75 kHz unity-gain loop bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 9 A continuous - supports high-density FPGA core rail requirements without external current sharing. |
| Input Voltage Ranges | VIN: 3.0–4.0 V; PVIN: 2.2–4.0 V - enables independent 3.3 V bias and 2.5 V power-stage operation. |
| Reference Accuracy | ±1% (0.88–0.90 V) - ensures tight output regulation across temperature and load for sub-2 V logic supplies. |
| Switching Frequency | Adjustable 280–700 kHz via RT resistor - balances efficiency vs. size trade-offs in compact PCB layouts. |
| MOSFET rDS(on) | 15 mΩ (high-side) / 15 mΩ (low-side) at VIN = 3.6 V - minimizes conduction loss at 9 A, enabling >90% efficiency at 1.8 V/9 A. |
| Thermal Shutdown | 135–165 °C trip point with 10 °C hysteresis - protects against sustained overload or inadequate heatsinking. |
| Power-Good Threshold | 90% of Vref (0.792–0.810 V) with 3% hysteresis - provides reliable reset signaling for processors during valid output establishment. |
Pinout & Package
TPS54974PWPR is housed in a thermally enhanced 28-pin HTSSOP (PWP) PowerPAD™ package measuring 6.4 mm × 9.7 mm, with an exposed thermal pad requiring solder connection to AGND for optimal junction-to-ambient thermal resistance (14.4 °C/W with solder).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return path for compensation network, VSENSE divider, SS/ENA capacitor, and RT resistor; must be tied to PowerPAD. |
| VSENSE (Pin 2) | Error amplifier inverting input | Connects to output voltage divider; senses regulated output with ±1% reference tracking. |
| COMP (Pin 3) | Error amplifier output | Drives external Type-3 compensation network to stabilize loop response at ~75 kHz unity gain. |
| PWRGD (Pin 4) | Open-drain power-good indicator | Asserts high when VSENSE ≥ 90% Vref; used for processor reset or supply sequencing coordination. |
| BOOT (Pin 5) | Bootstrap gate drive supply | Requires 0.022–0.1 µF ceramic capacitor to PH; enables high-side MOSFET drive above PVIN rail. |
| PH (Pins 6–14) | Phase node | High-current switching junction of internal FETs; connects directly to output inductor with minimal trace area. |
| RT (Pin 28) | Oscillator frequency set input | Resistor to AGND sets fs: 180 kΩ → 350 kHz, 68 kΩ → 700 kHz; floating defaults to 350 kHz. |
| SS/ENA (Pin 26) | Enable + slow-start control | Logic-high >1.2 V enables operation; capacitor to AGND extends soft-start time beyond internal 3.35 ms. |
| VBIAS (Pin 25) | Internal bias regulator output | Supplies 2.7–2.9 V to internal circuitry; requires 0.1–1.0 µF X5R/X7R ceramic bypass to AGND. |
| VIN (Pin 27) | Bias regulator input | 3.0–4.0 V supply for internal LDO; bypassed with 1 µF ceramic capacitor to AGND. |
| PVIN (Pins 20–24) | Power MOSFET input rail | 2.2–4.0 V supply for switches and driver stages; bypassed with ≥10 µF ceramic near PGND pins. |
| PGND (Pins 15–19) | Power ground return | High-current return for low-side FET and output inductor; must connect to large copper pour and input/output caps. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent input rails | VIN (3–4 V) powers bias circuitry; PVIN (2.2–4 V) powers power stage - enables optimized 3.3 V/2.5 V system partitioning. |
| Integrated 15-mΩ MOSFETs | Reduces board area and eliminates external switch selection; supports 9 A continuous with <10 W total dissipation at full load. |
| Externally compensated error amplifier | Enables precise loop shaping for fast transient response (<100 µs recovery) and stability across wide output capacitor ESR ranges. |
| Adjustable 280–700 kHz switching | Allows optimization of inductor size (e.g., 0.65 µH at 700 kHz) versus efficiency (peak >95% at mid-load). |
| PowerPAD™ thermal package | 28-pin PWP with exposed thermal pad achieves 14.4 °C/W θJA - eliminates need for external heatsink in most 9 A applications. |
Applications
| FPGA Core Supply | DSP I/O Rail Regulation |
|---|---|
|
Use Scenario: Powers 1.8 V core logic of high-end FPGAs (e.g., Xilinx Kintex-7, Intel Stratix V) under dynamic load steps up to 6 A/µs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with fast transient response and programmable soft-start for safe configuration sequencing. Use Value: Delivers 9 A continuous with <±0.5% output deviation during 0–9 A load steps, enabled by 3–5 MHz error amplifier bandwidth and Type-3 compensation. |
Use Scenario: Supplies 1.8 V I/O banks for multi-GHz DSPs where rail stability directly impacts signal integrity and timing margin. IC Role / Device Role / Timing Role: Point-of-load regulator with tight 0.891 V reference and 0.03%/A load regulation to maintain interface voltage compliance. Use Value: Maintains <±10 mV output variation from 0–9 A load, preventing setup/hold violations in high-speed parallel interfaces. |
| ASIC Memory Interface | Optical Transceiver Bias |
|
Use Scenario: Regulates 1.2–1.8 V supply for DDR3/DDR4 memory controllers in telecom baseband ASICs with bursty traffic patterns. IC Role / Device Role / Timing Role: High-current buck converter with thermal shutdown and current limit protection to guard against short-circuit faults on dense memory modules. Use Value: Sustains 9 A output while limiting junction temperature to <125 °C via 135 °C thermal shutdown, ensuring reliability in sealed chassis. |
Use Scenario: Provides stable 1.8 V bias for 10G/25G optical transceiver laser drivers and TIAs in networking line cards. IC Role / Device Role / Timing Role: Low-noise, well-regulated DC source with power-good signaling to enable laser activation only after stable voltage is confirmed. Use Value: Achieves <10 mVpp output ripple at 700 kHz switching, minimizing jitter injection into high-speed analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54873RHLR | 8-A rated, 2.95–6 V input, single-rail (no PVIN/VIN separation), 3.3 V minimum VOUT | Lacks dual-input capability and sub-1.5 V output support; unsuitable for 1.2–1.8 V FPGA core rails with 2.5 V PVIN. | Select only if system uses single 3.3–5 V input and requires ≥3.3 V output; not drop-in for TPS54974PWPR's dual-rail topology. |
| LM27402SDX/NOPB | 6-A rated, 2.7–5.5 V input, external MOSFETs required, no integrated PowerPAD™ thermal solution | Requires external high- and low-side FETs and gate drivers; increases BOM count and layout complexity. | Choose when higher than 9 A is needed or when discrete FET selection is required for specialized thermal or loss optimization. |
Compared with TPS54974PWPR, the TPS54873RHLR offers higher input voltage range but lacks dual-rail flexibility and sub-1.5 V output capability, while the LM27402SDX/NOPB trades integration for design flexibility at lower current rating and added component count.
Availability
TPS54974PWPR is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O regulation, ASIC memory interfaces, and optical transceiver biasing requiring stable component supply with full production traceability and long-term lifecycle support.
Supply support for TPS54974PWPR 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 over 50 years of innovation in high-reliability power conversion solutions.
The TPS54974 belongs to TI's SWIFT™ family of integrated synchronous buck regulators, designed specifically for high-current, low-voltage point-of-load applications in FPGA, DSP, and ASIC systems where dual-input flexibility and thermal efficiency are critical.
FAQ
What is the maximum continuous output current supported by the TPS54974PWPR?
The TPS54974PWPR supports 9 A continuous output current at 1.8 V with PVIN = 2.5 V and VIN = 3.3 V, as validated in the datasheet's efficiency and thermal performance graphs. Peak current capability reaches 16 A, but sustained operation above 9 A requires careful thermal design using the PowerPAD™ and ≥12 vias to minimize junction temperature rise.
How does the dual-input architecture (VIN and PVIN) function in the TPS54974PWPR?
In the TPS54974PWPR, VIN (pins 27, AGND-referenced) supplies the internal bias regulator and control circuitry, while PVIN (pins 20–24) powers the high- and low-side MOSFETs and driver stages. This separation allows simultaneous use of 3.3 V for logic bias and 2.5 V for the power stage, improving efficiency and enabling independent supply sequencing without damage.
What is the purpose of the PowerPAD™ thermal pad on the TPS54974PWPR package?
The exposed thermal pad on the TPS54974PWPR's 28-pin PWP package must be soldered to AGND to achieve the specified 14.4 °C/W junction-to-ambient thermal resistance. Without proper soldering and ≥12 thermal vias, junction temperature can exceed 125 °C under 9 A load, triggering thermal shutdown and disrupting operation.
Can the TPS54974PWPR operate with only the PVIN rail active while VIN is absent?
Yes - the TPS54974PWPR will release slow-start and drive the PH node at maximum duty cycle if VIN is present but PVIN is absent. However, UVLO is referenced solely to VIN, so the device remains enabled as long as VIN ≥ 2.95 V. Output voltage follows PVIN until regulation is achieved, making external PVIN sequencing control advisable for predictable startup.
What compensation topology is recommended for the TPS54974PWPR error amplifier?
A Type-3 compensation network is recommended for the TPS54974PWPR, as demonstrated in Figure 10 of the datasheet. This topology uses R1, R2, R3, C1, C2, and C4 to achieve ~75 kHz unity-gain bandwidth and adequate phase margin (>60°) across operating conditions, ensuring stable transient response for 0–9 A load steps.
TPS54974PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 4V
- Voltage - Output (Min/Fixed):
- 0.891V
- Voltage - Output (Max):
- 3.6V
- Current - Output:
- 9A
- Frequency - Switching:
- 350kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
TPS54974PWPR FAQ
1.How can I place an order for TPS54974PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54974PWPR 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 TPS54974PWPR reliable?
The price and inventory of TPS54974PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54974PWPR is usually 5 days.
3.What payment methods are accepted for TPS54974PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54974PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54974PWPR?
TPS54974PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54974PWPR 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 TPS54974PWPR?
For technical support, including TPS54974PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54974PWPR requirements.
6.How does Aetrix verify that TPS54974PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54974PWPR 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 TPS54974PWPR meets industry standards.
7.What is the process for return or replacement of TPS54974PWPR?
All TPS54974PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54974PWPR, 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 TPS54974PWPR part is unused and in its original packaging.
Return procedure for TPS54974PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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