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Texas Instruments TPS54311PWPRG4
- Part No.:
- TPS54311PWPRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54311PWPRG4.pdf
- Description:
- IC REG BUCK 0.9V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,131
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Product details
Overview
TPS54311PWPRG4 from Texas Instruments is a 3-A synchronous buck PWM converter with integrated 60-mΩ high- and low-side MOSFETs, fixed 0.9-V output voltage, and 1.0% initial accuracy. It operates from 3-V to 6-V input, delivers up to 3 A continuous output current, and features internal compensation, fast transient response, and thermal shutdown protection-designed for point-of-load regulation in FPGAs and microprocessors.
For engineers reviewing the TPS54311PWPRG4 datasheet, TPS54311PWPRG4 pinout, TPS54311PWPRG4 application, or TPS54311PWPRG4 equivalent, key selection considerations include its 0.9-V fixed output, HTSSOP-20 PowerPAD™ package, 350/550-kHz fixed or 280–700-kHz adjustable switching frequency, UVLO (2.95 V start), and powergood signaling for supply sequencing.
Technical Context
The TPS54311PWPRG4 implements a voltage-mode synchronous buck topology with an integrated high-performance error amplifier (26 dB open-loop gain, 3–5 MHz unity-gain bandwidth) and adaptive dead-time control to prevent shoot-through. Its PWM comparator features 70–85 ns propagation delay and 100 ns leading-edge blanking for robust current-limit response.
It supports dual-frequency operation via the FSEL pin (350 kHz at FSEL ≤ 0.8 V; 550 kHz at FSEL ≥ 2.5 V) or externally programmable frequency (280–700 kHz) using an RT-to-AGND resistor. The device operates in continuous conduction mode and includes internal slow-start (3.3 ms typical), undervoltage lockout (2.95 V start / 2.8 V stop), and thermal shutdown (135–165 °C trip).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.9 V ±2.5% over temperature and load; enables direct core supply for low-voltage DSPs and ASICs. |
| Input Voltage Range | 3 V to 6 V; compatible with 3.3-V and 5-V intermediate bus architectures without external LDO pre-regulation. |
| Continuous Output Current | 3 A; supported by integrated 60-mΩ high- and low-side MOSFETs, eliminating external power switches. |
| Switching Frequency | Fixed 350 kHz or 550 kHz (FSEL-controlled), or 280–700 kHz (RT-resistor programmable); balances efficiency, size, and EMI. |
| Efficiency | Up to 90% at 3 A, VIN = 5 V, VOUT = 0.9 V (TA = 25°C); enabled by low RDS(on) MOSFETs and optimized gate drive. |
| Thermal Resistance | RθJA = 26.0 °C/W (with PowerPAD™ soldered); allows 3.85 W max dissipation at TA = 25°C for compact PCB layouts. |
| Powergood Accuracy | PWRGD asserts when VSENSE ≥ 90% of 0.891-V reference; provides reliable reset signaling for processors and logic. |
Pinout & Package
TPS54311PWPRG4 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with PowerPAD™, requiring solder connection of the exposed thermal pad to AGND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return for compensation network, SS/ENA capacitor, VBIAS bypass, and RT/FSEL resistors; must connect to PowerPAD™. |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct feedback connection to output voltage sense point; sets regulation accuracy and loop stability. |
| NC (Pin 3) | No internal connection | Unbonded pin; must remain unconnected on PCB. |
| PWRGD (Pin 4) | Open-drain powergood output | Signals valid output (VSENSE ≥ 90% Vref); pulled low during UVLO, shutdown, or thermal fault. |
| BOOT (Pin 5) | Bootstrap supply for high-side driver | Connects 0.022–0.1-µF ceramic capacitor to PH; enables floating gate drive for integrated high-side MOSFET. |
| PH (Pins 6–10) | Phase node | Junction of internal MOSFETs and output inductor; carries high di/dt switching current; requires short, low-inductance layout. |
| RT (Pin 20) | Frequency setting resistor input | Connect resistor to AGND to program switching frequency from 280 kHz to 700 kHz (e.g., 180 kΩ → 280 kHz). |
| SS/ENA (Pin 18) | Slow-start/enable control | Enable threshold = 1.2 V; internal 3.3-ms soft-start ramps reference voltage to limit inrush current. |
| VBIAS (Pin 17) | Bias regulator output | Supplies 2.7–2.9 V to internal circuitry; requires 0.1–1.0-µF X7R/X5R ceramic bypass to AGND. |
| VIN (Pins 14–16) | Main input supply | 3–6 V input for power MOSFETs and bias regulator; each pin must be bypassed locally to PGND with 1–10-µF ceramic. |
| PGND (Pins 11–13) | Power ground return | High-current return path for low-side MOSFET and inductor; requires large copper pour connected to input/output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFETs | Enables 3-A output without external switches; reduces BOM count and board area while maintaining >90% peak efficiency. |
| Internally compensated control loop | Eliminates need for external compensation components; supports standard 4.7–10-µH inductors and common output capacitors. |
| Fast transient response | 10–20 µs recovery time under load step; achieved via high-bandwidth error amplifier (3–5 MHz GBW) and voltage-mode control. |
| Programmable switching frequency | 280–700 kHz range via RT resistor; allows optimization of inductor size, efficiency, and EMI filtering for specific applications. |
| Powergood (PWRGD) monitoring | Open-drain output with 90% Vref threshold and 3% hysteresis; provides reliable system reset and supply sequencing capability. |
Applications
| FPGA Core Supply | ASIC Point-of-Load Regulation |
|---|---|
|
Use Scenario: Delivering stable 0.9-V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA under dynamic load transients up to 3 A. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing tightly regulated core rail with fast transient response and powergood sequencing. Use Value: Enables reliable FPGA configuration and operation without external compensation or discrete MOSFETs, reducing solution size by >40% vs controller+MOSFET alternatives. |
Use Scenario: Generating 0.9-V supply for low-power ASICs in optical line cards where thermal density and reliability are critical. IC Role / Device Role / Timing Role: Synchronous buck converter delivering precise core voltage with thermal shutdown and UVLO protection. Use Value: Maintains regulation across –40°C to 125°C junction temperature with <±2.5% output tolerance, ensuring ASIC timing margin integrity. |
| DSP Power Management | Industrial Microprocessor Rail |
|
Use Scenario: Powering TI C6000 DSPs in broadband infrastructure equipment with strict ripple (<20 mVpp) and efficiency requirements. IC Role / Device Role / Timing Role: High-efficiency buck regulator with integrated MOSFETs and internal compensation for minimal external components. Use Value: Achieves >88% efficiency at full load (VIN = 5 V, VOUT = 0.9 V), reducing thermal load in fanless enclosures. |
Use Scenario: Supplying 0.9-V I/O or core rail to ARM Cortex-M7 microcontrollers in industrial PLC modules operating at 85°C ambient. IC Role / Device Role / Timing Role: Robust point-of-load regulator with thermal shutdown (150°C trip), UVLO, and powergood signaling. Use Value: Ensures safe shutdown and restart under overload or ambient overheating, preventing system-level latch-up or data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54311PWPR | Same silicon, identical electrical specs; differs only in RoHS compliance marking (G4 suffix denotes lead-free, green packaging). | No functional difference; both support same thermal, electrical, and layout requirements. | Select TPS54311PWPRG4 for RoHS-compliant, lead-free manufacturing; TPS54311PWPR for legacy non-green assembly. |
| TPS54312PWPRG4 | Identical package and architecture but fixed 1.2-V output; higher VOUT increases dropout margin but reduces core efficiency for sub-1-V logic. | Suitable for 1.2-V FPGA/ASIC cores; not drop-in for 0.9-V designs due to output voltage mismatch. | Choose only if target application requires 1.2-V output; otherwise, TPS54311PWPRG4 remains optimal for 0.9-V systems. |
Compared with TPS54311PWPR and TPS54312PWPRG4, the TPS54311PWPRG4 offers exact 0.9-V regulation with RoHS compliance, whereas the former lacks green marking and the latter delivers 1.2 V-making it unsuitable for true 0.9-V core rails without external feedback modification.
Availability
TPS54311PWPRG4 is available at Aetrix Electronics and suitable for FPGA core supply, ASIC point-of-load regulation, and industrial microprocessor rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS54311PWPRG4 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-efficiency DC-DC conversion.
The TPS54311PWPRG4 belongs to TI's SWIFT™ family of synchronous buck regulators, designed specifically for high-current, low-voltage point-of-load applications in computing, communications, and industrial systems.
FAQ
What is the output voltage tolerance of the TPS54311PWPRG4 over temperature and load?
The TPS54311PWPRG4 provides a fixed 0.9-V output with ±2.5% regulation tolerance across –40°C to 125°C junction temperature and 0–3-A load range. This specification is guaranteed under 3–6-V input conditions and reflects the combined effects of reference drift, error amplifier offset, and feedback divider accuracy-all trimmed during manufacturing to ensure tight DC accuracy without external calibration. The TPS54311PWPRG4 maintains this tolerance even during fast load transients due to its high-bandwidth error amplifier.
Does the TPS54311PWPRG4 require external compensation components?
No, the TPS54311PWPRG4 features internally compensated voltage-mode control, eliminating the need for external Type-II or Type-III compensation networks. Its control loop is optimized for standard 4.7–10-µH inductors and common ceramic or polymer output capacitors. This simplifies design, reduces bill-of-materials cost, and improves layout robustness-especially in space-constrained applications like portable computing or dense telecom modules where the TPS54311PWPRG4 is commonly deployed.
How does the TPS54311PWPRG4 handle overcurrent conditions?
The TPS54311PWPRG4 employs cycle-by-cycle peak current limiting with 100 ns leading-edge blanking to reject switch-node noise. When high-side MOSFET current exceeds the threshold (4.5–7.5 A depending on VIN), the high-side FET turns off within 200 ns. During sustained overload, thermal shutdown activates at 135–165°C junction temperature. The TPS54311PWPRG4 also supports continuous current sinking-critical for managing negative load transients in FPGA and DSP applications.
Can the switching frequency of the TPS54311PWPRG4 be synchronized to an external clock?
No-the TPS54311PWPRG4 does not include a SYNC pin and cannot be externally synchronized. It supports only three frequency modes: fixed 350 kHz (FSEL ≤ 0.8 V), fixed 550 kHz (FSEL ≥ 2.5 V), or resistor-programmed 280–700 kHz (FSEL floating, RT resistor to AGND). For synchronization capability, designers should consider the TPS54310 or newer SWIFT™ devices like the TPS544B20, which explicitly include a SYNC input. The TPS54311PWPRG4's lack of SYNC is a deliberate architectural choice to minimize pin count and simplify layout in cost-sensitive applications.
What is the role of the PowerPAD™ thermal pad in the TPS54311PWPRG4 package?
The exposed PowerPAD™ on the underside of the TPS54311PWPRG4's HTSSOP-20 package must be soldered to a large AGND copper pour to achieve the specified RθJA of 26.0 °C/W. This thermal interface conducts heat directly from the die to the PCB, enabling 3.85 W power dissipation at 25°C ambient. Without proper soldering and thermal vias, RθJA degrades to 57.5 °C/W-reducing usable output current by ~40% at elevated temperatures. The TPS54311PWPRG4's PowerPAD™ is electrically connected to AGND, not PGND, and serves both thermal and grounding functions.
TPS54311PWPRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 350kHz, 550kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
TPS54311PWPRG4 FAQ
1.How can I place an order for TPS54311PWPRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54311PWPRG4 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 TPS54311PWPRG4 reliable?
The price and inventory of TPS54311PWPRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54311PWPRG4 is usually 5 days.
3.What payment methods are accepted for TPS54311PWPRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54311PWPRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54311PWPRG4?
TPS54311PWPRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54311PWPRG4 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 TPS54311PWPRG4?
For technical support, including TPS54311PWPRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54311PWPRG4 requirements.
6.How does Aetrix verify that TPS54311PWPRG4 is sourced from the original manufacturer or authorized distributors?
All TPS54311PWPRG4 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 TPS54311PWPRG4 meets industry standards.
7.What is the process for return or replacement of TPS54311PWPRG4?
All TPS54311PWPRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54311PWPRG4, 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 TPS54311PWPRG4 part is unused and in its original packaging.
Return procedure for TPS54311PWPRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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