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Texas Instruments TPS54311MPWPREP
- Part No.:
- TPS54311MPWPREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54311MPWPREP.pdf
- Description:
- IC REG BUCK 0.9V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
TPS54311MPWPREP from Texas Instruments is a radiation-hardened, high-efficiency synchronous-buck PWM converter with integrated 60-mΩ high- and low-side MOSFETs, delivering up to 3 A continuous output current at 0.9 V fixed output voltage with ±3% regulation over –55°C to 125°C. It operates from 3 V to 6 V input, features internal compensation, and targets point-of-load regulation for FPGAs and DSPs in aerospace and defense systems.
For engineers reviewing the TPS54311MPWPREP datasheet, TPS54311MPWPREP pinout, TPS54311MPWPREP application, or TPS54311MPWPREP equivalent, key selection criteria include its extended temperature range (–55°C to 125°C), PowerPAD™ thermal package, 350/550 kHz fixed or 280–700 kHz adjustable switching frequency, and integrated current limiting and thermal shutdown protection.
Technical Context
The TPS54311MPWPREP implements a voltage-mode PWM control architecture with a high-bandwidth (3–5 MHz) error amplifier and adaptive dead-time logic to prevent shoot-through in its integrated N-channel MOSFET pair. Its oscillator supports dual fixed frequencies (350 kHz or 550 kHz) via FSEL pin logic or externally programmable frequency (280–700 kHz) using an RT-to-AGND resistor.
It integrates undervoltage lockout (UVLO start at 2.95 V, hysteresis 0.14 V), internal slow-start (3.3 ms typical), power-good monitoring (90% VREF threshold), and thermal shutdown (trip at 135–165°C). The device separates analog ground (AGND) and power ground (PGND) internally, requiring dedicated PCB layout with PowerPAD soldered to AGND for stable operation at full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 6 V - Supports standard 3.3 V and 5 V intermediate bus rails without external regulators. |
| Output Voltage | Fixed 0.9 V ±3% - Precision trimmed reference enables direct core supply for low-voltage DSPs/FPGAs. |
| Continuous Output Current | 3 A - Sustained delivery under full thermal derating at 125°C junction temperature. |
| Switching Frequency | 350 kHz (FSEL = low) or 550 kHz (FSEL = high); adjustable 280–700 kHz via RT resistor - Enables EMI optimization and inductor size trade-offs. |
| Integrated MOSFET rDS(on) | High-side: 85–136 mΩ @ 3 V VIN; low-side: 59–88 mΩ @ 6 V VIN - Minimizes conduction loss and eliminates external FET layout complexity. |
| Operating Temperature Range | –55°C to +125°C - Qualified per JEDEC extended temp standards for space-grade and military applications. |
| Power Good Threshold | VSENSE ≥ 90% VREF - Provides reliable reset signaling for processors upon stable 0.9 V rail establishment. |
Pinout & Package
TPS54311MPWPREP uses a thermally enhanced 20-pin HTSSOP (PWP) PowerPAD™ package with exposed copper thermal pad on underside, requiring solder connection to AGND plane for effective heat dissipation and noise control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return path for error amplifier, SS/ENA capacitor, VBIAS bypass, and RT/FSEL resistors; must connect directly to PowerPAD. |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct feedback node for output voltage sensing; requires Kelvin connection to minimize IR drop errors. |
| NC (Pin 3) | No internal connection | Unbonded pin; must remain unconnected and unstubbed on PCB. |
| PWRGD (Pin 4) | Open-drain power-good indicator | Sinks current when VSENSE < 90% VREF or during shutdown; requires external pull-up for logic-level signaling. |
| BOOT (Pin 5) | Bootstrap gate drive supply | Connects 0.022–0.1 µF ceramic capacitor to PH to generate floating voltage for high-side MOSFET driver. |
| PH (Pins 6–10) | Phase node | Internal switch node connecting high- and low-side MOSFETs; connects to output inductor and BOOT capacitor. |
| RT (Pin 20) | Frequency setting input | Resistor to AGND sets switching frequency from 280–700 kHz; open for fixed-frequency mode. |
| FSEL (Pin 19) | Frequency select logic input | Logic-low selects 350 kHz; logic-high selects 550 kHz; floating enables RT-programmed mode. |
| SS/ENA (Pin 18) | Slow-start/enable control | Enable threshold at 0.82–1.4 V; external capacitor extends soft-start time beyond internal 3.3 ms default. |
| VBIAS (Pin 17) | Bias regulator output | Supplies 2.7–2.95 V to internal circuitry; requires 0.1–1 µF X7R/X5R ceramic bypass to AGND. |
| VIN (Pins 14–16) | Main input supply | 3–6 V input for power switches and bias regulator; each pin must be individually decoupled to PGND. |
| PGND (Pins 11–13) | Power ground return | High-current return for low-side MOSFET and input/output capacitors; connects to separate power ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFETs | Eliminates external FETs and drivers, reducing BOM count and PCB area while maintaining >90% efficiency at 3 A. |
| Internal compensation network | Enables stable operation with standard 4.7–10 µH inductors and 470 µF output capacitance-no loop compensation design required. |
| Adaptive dead-time control | Prevents shoot-through by dynamically adjusting high-/low-side gate timing based on MOSFET characteristics and load conditions. |
| Extended temperature qualification | Validated per JEDEC HAST, temperature cycling, and electromigration tests for reliable operation in harsh environments. |
| PowerPAD™ thermal interface | Exposed die pad soldered to AGND provides 26°C/W junction-to-ambient thermal resistance (with proper PCB layout). |
Applications
| Point-of-Load FPGA Core Supply | Space-Qualified DSP Power Rail |
|---|---|
Use Scenario: Providing tightly regulated 0.9 V core voltage to Xilinx Kintex-7 FPGA in low-earth orbit satellite payload. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated power stage, delivering 3 A at 350 kHz switching frequency. Use Value: Radiation-tolerant design and –55°C to 125°C operation ensure uninterrupted core power under thermal vacuum and ionizing radiation exposure. |
Use Scenario: Powering TI C6678 multicore DSP in airborne radar signal processing unit operating at 125°C ambient. IC Role / Device Role / Timing Role: High-density DC/DC converter with PowerPAD thermal management enabling 3 A output without heatsink. Use Value: Internal slow-start (3.3 ms) and power-good signaling coordinate safe boot sequence with FPGA configuration logic. |
| Military Vehicle Telematics Module | Avionics Sensor Interface Board |
Use Scenario: Generating 0.9 V supply for ARM Cortex-A9 processor in ruggedized vehicle communications gateway. IC Role / Device Role / Timing Role: Input-filtered buck converter accepting 3–6 V battery-derived input with UVLO protection against cold-cranking dips. Use Value: 2.95 V UVLO start threshold and 0.14 V hysteresis prevent erratic resets during engine cranking transients. |
Use Scenario: Powering precision ADC and op-amp front-end on flight-control sensor board with strict noise requirements. IC Role / Device Role / Timing Role: Low-noise, internally compensated regulator with separated AGND/PGND planes minimizing analog supply coupling. Use Value: High PSRR and fast transient response (<20 µs recovery) maintain signal integrity during digital burst loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54312MPWPREP | Fixed 1.2 V output (vs. 0.9 V); identical package, pinout, and thermal specs | Used where higher core voltage required for legacy ASICs or microcontrollers | Select when system requires 1.2 V instead of 0.9 V; no layout change needed. |
| LMZ12003TZE/NOPB | 3 A SIMPLE SWITCHER® module with integrated inductor; wider 4.5–20 V input; no external RT/FSEL control | Preferred for rapid prototyping or space-constrained designs where inductor integration outweighs efficiency trade-off | Choose for reduced design cycle time and EMI filtering simplicity; accepts higher input voltage but lacks frequency programming. |
Compared with TPS54311MPWPREP, TPS54312MPWPREP offers identical form-factor and thermal performance but targets 1.2 V loads, while LMZ12003TZE/NOPB trades programmability and peak efficiency for full integration and ease of use in non-radiation-hardened platforms.
Availability
TPS54311MPWPREP is available at Aetrix Electronics and suitable for aerospace power distribution, defense avionics subsystems, and satellite payload regulation requiring stable component supply across extended temperature and radiation environments.
Supply support for TPS54311MPWPREP 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 high-reliability components for industrial, automotive, and aerospace markets.
The TPS54311MPWPREP belongs to TI's SWIFT™ family of radiation-hardened DC/DC converters, engineered specifically for point-of-load regulation in mission-critical systems where extended temperature operation and reliability under stress are mandatory.
FAQ
What is the output voltage tolerance of the TPS54311MPWPREP over temperature and load?
The TPS54311MPWPREP delivers 0.9 V output with ±3.0% initial accuracy at TJ = 25°C and maintains this regulation across –55°C to 125°C junction temperature and 0–3 A load range. This specification is verified per Electrical Characteristics table in the official datasheet (SGLS376A), ensuring predictable core rail behavior in extreme environments where the TPS54311MPWPREP is deployed.
Does the TPS54311MPWPREP require external compensation components?
No, the TPS54311MPWPREP features an internally compensated control loop optimized for standard 4.7–10 µH inductors and typical output capacitor values. This eliminates the need for external Type-II or Type-III compensation networks, simplifying design and reducing bill-of-materials cost while maintaining stability across line, load, and temperature variations-key for the TPS54311MPWPREP's target aerospace applications.
How is thermal management implemented in the TPS54311MPWPREP package?
The TPS54311MPWPREP uses a 20-pin HTSSOP (PWP) package with an exposed PowerPAD™ thermal pad that must be soldered directly to the AGND plane. With proper PCB layout-including six 0.013″ vias in the pad area and four additional 0.018″ vias under the device-the TPS54311MPWPREP achieves 26°C/W junction-to-ambient thermal resistance, enabling full 3 A operation at 125°C ambient without external heatsinking.
Can the TPS54311MPWPREP be synchronized to an external clock?
Yes, the TPS54311MPWPREP supports external synchronization over 330–700 kHz by driving a clean clock signal into the FSEL pin while configuring RT for 80% of the target frequency. The datasheet specifies RC filter limits (R ≤1 kΩ, C ≤68 pF) between the clock source and FSEL to preserve edge integrity-enabling deterministic timing alignment critical for the TPS54311MPWPREP's use in phased-array radar and multi-rail sequencing systems.
What protection features does the TPS54311MPWPREP include?
The TPS54311MPWPREP integrates peak current limiting (4–6.5 A trip threshold), thermal shutdown (135–165°C trip with 10°C hysteresis), undervoltage lockout (2.95 V start, 2.8 V stop), and power-good monitoring (90% VREF threshold with 35 µs deglitch). These protections operate autonomously without external components, ensuring robust fault handling in unattended TPS54311MPWPREP deployments such as satellite power systems.
TPS54311MPWPREP 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:
- Active
- 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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
TPS54311MPWPREP FAQ
1.How can I place an order for TPS54311MPWPREP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54311MPWPREP 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 TPS54311MPWPREP reliable?
The price and inventory of TPS54311MPWPREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54311MPWPREP is usually 5 days.
3.What payment methods are accepted for TPS54311MPWPREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54311MPWPREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54311MPWPREP?
TPS54311MPWPREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54311MPWPREP 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 TPS54311MPWPREP?
For technical support, including TPS54311MPWPREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54311MPWPREP requirements.
6.How does Aetrix verify that TPS54311MPWPREP is sourced from the original manufacturer or authorized distributors?
All TPS54311MPWPREP 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 TPS54311MPWPREP meets industry standards.
7.What is the process for return or replacement of TPS54311MPWPREP?
All TPS54311MPWPREP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54311MPWPREP, 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 TPS54311MPWPREP part is unused and in its original packaging.
Return procedure for TPS54311MPWPREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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