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Texas Instruments TPS54315QPWPREP
- Part No.:
- TPS54315QPWPREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54315QPWPREP.pdf
- Description:
- IC REG BUCK 2.5V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
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Product details
Overview
TPS54315QPWPREP from Texas Instruments is a radiation-hardened, synchronous-buck PWM DC/DC converter with integrated 60-mΩ high- and low-side MOSFETs, delivering up to 3 A continuous output current at a fixed 2.5 V output voltage with ±3% regulation over –55°C to 125°C. It operates from a 3-V to 6-V input, features internal compensation, and supports adjustable switching frequency from 280 kHz to 700 kHz via RT resistor or fixed 350/550 kHz via FSEL pin. It is used in point-of-load regulation for space-grade FPGAs and radiation-tolerant microprocessors.
For engineers reviewing the TPS54315QPWPREP datasheet, TPS54315QPWPREP pinout, TPS54315QPWPREP application, or TPS54315QPWPREP equivalent, key selection criteria include its extended temperature range (–55°C to 125°C), integrated PowerPAD™ thermal management, 1% initial output accuracy, undervoltage lockout (2.95 V start), and power-good signaling for processor reset sequencing in harsh-environment systems.
Technical Context
This device implements a voltage-mode PWM control architecture with a high-bandwidth error amplifier (3–5 MHz unity-gain bandwidth) and adaptive dead-time logic to prevent shoot-through in its integrated N-channel MOSFET pair. The oscillator supports both internally set frequencies (350 kHz or 550 kHz) and externally programmable operation (280–700 kHz) using an RT-to-AGND resistor.
It integrates critical protection functions: peak-current limiting (4–6.5 A trip), thermal shutdown (135–165°C trip with 10°C hysteresis), and a 35-µs deglitched open-drain PWRGD output that asserts low when VSENSE falls below 90% of the 0.891-V reference. The SS/ENA pin provides dual-function enable control and external slow-start timing via capacitor coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V with ±3% regulation over full load (0–3 A) and temperature (–55°C to 125°C) |
| Input Voltage Range | 3 V to 6 V - supports standard 3.3-V and 5-V intermediate bus architectures |
| Continuous Output Current | 3 A - sustained delivery without derating under proper thermal layout (PowerPAD soldered to AGND) |
| Switching Frequency | Adjustable 280–700 kHz (RT resistor) or fixed 350/550 kHz (FSEL logic) - enables EMI optimization and inductor size trade-offs |
| Internal MOSFET rDS(on) | High-side: 85–136 mΩ @ 3 V VIN; low-side: 59–88 mΩ @ 6 V VIN - defines conduction loss and thermal dissipation at full load |
| Reference Voltage Accuracy | 0.891 V ±1% at TJ = 25°C - enables precise output regulation and stable feedback loop performance |
| Quiescent Current | 6.2–12.8 mA depending on FSEL state and frequency - impacts light-load efficiency in always-on subsystems |
Pinout & Package
The TPS54315QPWPREP is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ for direct thermal connection to the PCB's analog ground plane. Proper soldering of the PowerPAD to AGND is mandatory for achieving rated 3-A output and junction temperature compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return for VSENSE divider, SS/ENA capacitor, VBIAS bypass, RT/FSEL resistors - must tie directly to PowerPAD and isolated analog ground plane |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct connection to output voltage sense point - determines regulation accuracy and loop stability |
| NC (Pin 3) | No internal connection | Unbonded pad - must remain unconnected per TI design guidelines |
| PWRGD (Pin 4) | Open-drain power-good indicator | Asserts high-Z when VSENSE ≥ 90% Vref; sinks current when disabled or out-of-regulation - used for processor reset and supply sequencing |
| BOOT (Pin 5) | Bootstrap gate drive supply | Connects 0.022–0.1-µF ceramic capacitor to PH - generates floating voltage for high-side MOSFET gate drive |
| PH (Pins 6–10) | Phase node | Junction of internal high/low-side MOSFETs - connects to output inductor - requires low-inductance layout to minimize switching noise |
| RT (Pin 20) | Frequency setting input | Resistor to AGND sets switching frequency (280–700 kHz); open for internal 350/550 kHz modes |
| FSEL (Pin 19) | Frequency select logic input | Logic-low (≤0.8 V) selects 350 kHz; logic-high (≥2.5 V) selects 550 kHz; float enables RT programming |
| SS/ENA (Pin 18) | Slow-start/enable control | Enable threshold: 0.82–1.4 V; internal slow-start time: 4.7 ms; external capacitor extends ramp time linearly |
| VBIAS (Pin 17) | Bias regulator output | 2.7–2.95 V regulated supply for internal circuitry; bypass with 0.1–1-µF X7R/X5R ceramic to AGND |
| VIN (Pins 14–16) | Main input supply | 3–6 V input for power switches and VBIAS regulator - requires local 1–10-µF low-ESR ceramic decoupling to PGND |
| PGND (Pins 11–13) | Power ground return | High-current return path for low-side MOSFET and input/output capacitors - connect to large copper areas and input/output cap negatives |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFETs | Enables compact, high-efficiency 3-A point-of-load conversion without external power switches or gate drivers |
| Internally compensated control loop | Eliminates need for external compensation components - reduces BOM count and design cycle time for standard 4.7–10 µH inductors |
| PowerPAD™ thermal package | 20-pin HTSSOP with exposed die paddle - achieves 26°C/W θJA when soldered to AGND, enabling full 3-A operation without heatsink |
| Radiation-hardened EP grade | Qualified per JEDEC/industry standards for extended temperature (–55°C to 125°C) and reliability in space and defense applications |
| Fast transient response | Typical recovery time <20 µs under 2-A load step - maintains tight regulation for FPGA core voltage during burst-mode operation |
| Programmable soft-start | Internal 4.7-ms ramp + optional external capacitor - prevents inrush current and ensures controlled power-up sequencing with downstream logic |
Applications
| Spacecraft Onboard Computers | Defense Radar Signal Processors |
|---|---|
Use Scenario: Powering radiation-tolerant FPGAs and ASICs in LEO satellite avionics bays where ambient temperatures swing from –40°C to +85°C. IC Role / Device Role / Timing Role: Point-of-load synchronous buck regulator providing stable 2.5-V core voltage with PWRGD sequencing for cold-start initialization. Use Value: Integrated MOSFETs and PowerPAD eliminate discrete power stage layout complexity while meeting MIL-PRF-38535 Class K reliability requirements. |
Use Scenario: Supplying DSPs and ADCs in airborne radar front-end modules subject to shock, vibration, and wide thermal cycling. IC Role / Device Role / Timing Role: Primary 3-A DC/DC converter with undervoltage lockout (2.95 V) and thermal shutdown (135°C) for fault containment. Use Value: Fixed 2.5-V output with ±3% tolerance ensures consistent ADC reference margin and DSP timing closure across mission profiles. |
| High-Reliability Industrial Controllers | Nuclear Instrumentation Systems |
Use Scenario: Regulating I/O module microcontrollers and isolated communication interfaces in oil & gas downhole telemetry systems. IC Role / Device Role / Timing Role: Input-stage buck converter accepting 3.3-V or 5-V backplane power and delivering clean 2.5-V logic supply. Use Value: Internal compensation and fast transient response maintain signal integrity during rapid sensor polling bursts in noisy industrial environments. |
Use Scenario: Powering gamma spectrometer front-end amplifiers and pulse-shaping circuits in reactor monitoring equipment. IC Role / Device Role / Timing Role: Radiation-hardened voltage source with low-output-ripple design (via optimized L-C filter) for precision analog signal chains. Use Value: 0.891-V reference trimmed to ±1% enables sub-1% total system voltage error - critical for energy calibration accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54315MPWPREP | Same silicon, identical electrical specs, but marked "MPWPREP" - TI's standard production-grade variant without QML-Q qualification | Lacks QML-Q screening and extended DMS support; not approved for flight-critical space programs | Select TPS54315QPWPREP only when QML-Q certification, radiation tolerance, or guaranteed long-term availability per SMD 5962-07231 are required. |
| LMZ12003TZE/NOPB | 3-A SIMPLE SWITCHER® module with integrated inductor; 4.5–20-V input; fixed 2.5-V output; larger footprint (13.5 × 12.5 mm) | Higher integration (inductor included) but lower efficiency at light loads; no RT/FSEL programmability; not radiation-hardened | Choose LMZ12003TZE/NOPB for rapid prototyping or non-radiation environments where board area is less constrained than thermal performance. |
Compared with TPS54315MPWPREP, the TPS54315QPWPREP adds QML-Q qualification and guaranteed extended-lifecycle support for space programs, while LMZ12003TZE/NOPB trades programmability and thermal density for module-level simplicity - making TPS54315QPWPREP the sole choice for radiation-tolerant, high-power-density 2.5-V POL designs.
Availability
TPS54315QPWPREP is available at Aetrix Electronics and suitable for spacecraft avionics, defense radar processors, and nuclear instrumentation systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TPS54315QPWPREP 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 power management solutions, with decades of heritage in aerospace-grade component development.
The TPS5431x-EP family delivers radiation-tolerant, high-current synchronous buck regulation for space and defense electronics - designed specifically to replace discrete power stages in SWaP-constrained, mission-critical systems.
FAQ
What is the operating temperature range for the TPS54315QPWPREP?
The TPS54315QPWPREP is qualified for operation from –55°C to +125°C junction temperature, meeting extended temperature requirements for space and defense applications. Its thermal shutdown activates between 135°C and 165°C with 10°C hysteresis, and the PowerPAD™ package must be soldered to AGND to sustain full 3-A output across this range. This specification is verified per JEDEC standards including HAST, temperature cycling, and bond intermetallic life testing.
Does the TPS54315QPWPREP require external compensation components?
No, the TPS54315QPWPREP features an internally compensated voltage-mode control loop optimized for standard 4.7 µH to 10 µH output inductors and typical ceramic output capacitors. This eliminates external compensation networks, reducing BOM count and layout complexity. However, proper placement of the VBIAS bypass capacitor (0.1–1 µF X7R/X5R to AGND) and BOOT capacitor (0.022–0.1 µF) remains mandatory for stable operation of the TPS54315QPWPREP.
How is the output voltage set on the TPS54315QPWPREP?
The TPS54315QPWPREP has a factory-trimmed fixed 2.5-V output voltage, achieved by precision scaling of an internal 0.891-V bandgap reference. No external resistive divider is needed - VSENSE connects directly to the output node. The device maintains ±3% regulation over 0–3 A load, 3–6 V input, and –55°C to 125°C temperature, with line regulation of 0.21%/V and load regulation of 0.21%/A as specified in the TPS54315QPWPREP datasheet.
Can the switching frequency of the TPS54315QPWPREP be adjusted?
Yes, the TPS54315QPWPREP supports three frequency modes: fixed 350 kHz (FSEL ≤0.8 V), fixed 550 kHz (FSEL ≥2.5 V), or adjustable 280–700 kHz via an RT-to-AGND resistor (FSEL floated). For example, a 100-kΩ resistor sets ~350 kHz, while 68 kΩ yields ~700 kHz. External synchronization between 330–700 kHz is also supported by driving FSEL with a clock signal and setting RT for 80% of that frequency.
What is the purpose of the PowerPAD™ on the TPS54315QPWPREP package?
The PowerPAD™ is an exposed thermal pad on the underside of the TPS54315QPWPREP's 20-pin HTSSOP package, electrically connected to AGND. It must be soldered to a dedicated analog ground plane with ≥6 thermal vias (0.013″ diameter) to achieve the rated 26°C/W junction-to-ambient thermal resistance. This enables full 3-A output capability without external heatsinks and prevents thermal shutdown under sustained load - a critical requirement for the TPS54315QPWPREP in sealed or convection-limited enclosures.
TPS54315QPWPREP 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):
- 2.5V
- 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
TPS54315QPWPREP FAQ
1.How can I place an order for TPS54315QPWPREP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54315QPWPREP 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 TPS54315QPWPREP reliable?
The price and inventory of TPS54315QPWPREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54315QPWPREP is usually 5 days.
3.What payment methods are accepted for TPS54315QPWPREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54315QPWPREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54315QPWPREP?
TPS54315QPWPREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54315QPWPREP 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 TPS54315QPWPREP?
For technical support, including TPS54315QPWPREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54315QPWPREP requirements.
6.How does Aetrix verify that TPS54315QPWPREP is sourced from the original manufacturer or authorized distributors?
All TPS54315QPWPREP 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 TPS54315QPWPREP meets industry standards.
7.What is the process for return or replacement of TPS54315QPWPREP?
All TPS54315QPWPREP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54315QPWPREP, 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 TPS54315QPWPREP part is unused and in its original packaging.
Return procedure for TPS54315QPWPREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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