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Texas Instruments TPS54315MPWPREP
- Part No.:
- TPS54315MPWPREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54315MPWPREP.pdf
- Description:
- IC REG BUCK 2.5V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,809
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Product details
Overview
TPS54315MPWPREP 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 dual fixed frequencies (350/550 kHz) via FSEL pin. It is designed for point-of-load regulation in high-reliability aerospace and defense systems.
For engineers reviewing the TPS54315MPWPREP datasheet, TPS54315MPWPREP pinout, TPS54315MPWPREP application, or TPS54315MPWPREP equivalent, key selection considerations include its extended temperature range (–55°C to 125°C), PowerPAD™ thermal package, integrated current limiting and thermal shutdown, and compatibility with SWIFT™ design tools for rapid power supply implementation in harsh-environment embedded systems.
Technical Context
The TPS54315MPWPREP implements a voltage-mode PWM control architecture with a high-performance error amplifier (3–5 MHz unity-gain bandwidth), adaptive dead-time logic to prevent shoot-through, and leading-edge blanking (100 ns) for robust current-limit response. Its internal bias regulator (VBIAS) supplies stable 2.7–2.95 V to analog circuitry and supports external bypassing with 0.1–1 µF ceramic capacitors.
It integrates undervoltage lockout (UVLO start: 2.95 V, hysteresis: 0.14 V), programmable slow-start (internal time: 4.7 ms for 2.5 V output), and open-drain power-good signaling (90% VREF threshold, 35 µs deglitch). The device uses a single-phase, synchronous rectification topology with PH pin as the switch node connecting to an external inductor and output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±3% over full temperature and load range - enables direct replacement of standard 2.5 V LDOs without feedback divider redesign. |
| Input Voltage Range | 3 V to 6 V - compatible with 3.3 V and 5 V intermediate bus architectures in avionics and space-grade electronics. |
| Continuous Output Current | 3 A - sufficient for powering FPGAs, DSPs, and ASICs requiring stable 2.5 V core or I/O rails under transient loads. |
| Switching Frequency | Adjustable 280–700 kHz (RT resistor) or fixed 350/550 kHz (FSEL) - allows optimization of size vs. efficiency and EMI filtering requirements. |
| Thermal Operating Range | –55°C to +125°C junction - qualified per JEDEC extended-temperature standards for use in uncontrolled ambient environments. |
| Power MOSFET rDS(on) | High-side: 59–88 mΩ @ VI = 6 V; low-side matched - ensures >85% peak efficiency at 3 A/5 VIN/2.5 VOUT with minimal thermal derating. |
| Protection Features | Peak current limit (4–6.5 A), thermal shutdown (135–165°C trip), UVLO, and power-good monitoring - eliminates need for external fault management circuitry. |
Pinout & Package
The TPS54315MPWPREP is housed in a thermally enhanced 20-pin HTSSOP (PWP) PowerPAD™ package with exposed copper thermal pad soldered directly to AGND on PCB. This package eliminates heatsinks and supports high-power density layouts in constrained aerospace modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return path for error amplifier, SS/ENA, VBIAS, RT, and FSEL circuits - must be connected to PowerPAD and isolated from noisy PGND except at single-point IC tie. |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct connection to output voltage sense point - enables precise regulation without external resistor divider for fixed-output variants. |
| NC (Pin 3) | No internal connection | Unbonded pin - must remain floating; no PCB trace or copper pour should connect to this pad. |
| PWRGD (Pin 4) | Open-drain power-good indicator | Sinks current when VSENSE ≥ 90% VREF; used for processor reset sequencing or system-level fault reporting. |
| BOOT (Pin 5) | Bootstrap supply for high-side gate driver | Requires 0.022–0.1 µF low-ESR ceramic capacitor between BOOT and PH - critical for reliable high-side FET turn-on. |
| PH (Pins 6–10) | Switch node / phase output | Common drain connection of internal MOSFETs - connects to external inductor; multiple pins reduce resistance and improve thermal conduction. |
| RT (Pin 20) | Frequency-setting resistor input | Connect resistor to AGND to set switching frequency from 280–700 kHz - enables EMI tuning and inductor size optimization. |
| FSEL (Pin 19) | Frequency select logic input | Logic-low (≤0.8 V) selects 350 kHz; logic-high (≥2.5 V) selects 550 kHz - simplifies board-level frequency configuration without resistors. |
| SS/ENA (Pin 18) | Slow-start and enable control | Enable threshold: 0.82–1.4 V; internal 4.7 ms soft-start for 2.5 V output - prevents inrush current and supports controlled power-up sequencing. |
| VBIAS (Pin 17) | Internal bias regulator output | Supplies 2.7–2.95 V to internal circuitry; requires 0.1–1 µF ceramic bypass to AGND - may serve as clean reference for external analog blocks. |
| VIN (Pins 14–16) | Main input supply | 3–6 V input for power switches and VBIAS regulator - must be bypassed with 1–10 µF low-ESR ceramic capacitors near each VIN pin. |
| PGND (Pins 11–13) | Power ground return | High-current return for low-side FET and input/output capacitors - requires large copper pour tied to input/output capacitor negatives. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFETs | Enables compact, high-efficiency 3-A buck conversion without external power switches - reduces BOM count and layout complexity. |
| Internal compensation network | Eliminates need for external Type-II/III compensation components - accelerates design cycle and improves stability across operating conditions. |
| PowerPAD™ thermal package | 20-pin HTSSOP with exposed die paddle soldered to AGND - achieves 26°C/W θJA with proper PCB layout, enabling full 3-A operation without heatsink. |
| Extended temperature qualification | JEDEC-compliant testing including HAST, temperature cycling, and electromigration - ensures reliability in satellite, missile, and downhole applications. |
| Programmable soft-start | 4.7 ms internal ramp for 2.5 V output; extendable via external capacitor on SS/ENA - prevents output overshoot and controls inrush during cold-start. |
| Robust protection suite | Current limit (4–6.5 A), thermal shutdown (135–165°C), UVLO (2.95 V start), and power-good monitoring - provides autonomous fault recovery in unattended systems. |
Applications
| Avionics Power Distribution | Satellite Onboard Computers |
|---|---|
|
Use Scenario: Regulating 2.5 V supply for FPGA configuration memory and I/O banks in flight control computers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 2.5 V at up to 3 A with fast transient response (<20 µs recovery). Use Value: Meets DO-254 deterministic timing requirements and withstands vibration, radiation, and thermal cycling across –55°C to +125°C. |
Use Scenario: Providing stable 2.5 V rail to radiation-tolerant microprocessors in low-earth orbit (LEO) payloads. IC Role / Device Role / Timing Role: Point-of-load DC/DC converter with power-good signaling for safe boot sequencing and watchdog-triggered reset. Use Value: Qualified for space applications per MIL-PRF-38535 Class V; PowerPAD layout minimizes thermal resistance in vacuum-constrained enclosures. |
| Downhole Telemetry Systems | Military Radar Signal Processing |
|
Use Scenario: Powering ADCs and interface ICs in oil/gas well logging tools exposed to 125°C ambient and mechanical shock. IC Role / Device Role / Timing Role: High-reliability buck converter with internal current limit and thermal shutdown to survive intermittent overloads. Use Value: Extended temperature rating and JEDEC-qualified packaging ensure uninterrupted operation during deep-well deployment cycles. |
Use Scenario: Supplying 2.5 V to high-speed DACs and clock buffers in phased-array radar front-end modules. IC Role / Device Role / Timing Role: Low-noise, fast-transient regulator synchronized via FSEL/RT to avoid beat frequencies with RF subsystem clocks. Use Value: Adjustable 280–700 kHz switching frequency enables EMI compliance in dense RF-integrated assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54315PWPR | Commercial-grade version (–40°C to 125°C); identical electrical specs and pinout but lacks radiation hardening and extended temp qualification. | Suitable for industrial or telecom infrastructure where radiation tolerance and –55°C startup are not required. | Select TPS54315PWPR only if full EP-grade reliability and extended temperature range are unnecessary - lower cost and broader distributor availability. |
| LMZ12003TZE/NOPB | 3-A SIMPLE SWITCHER® module with integrated inductor; wider input (4.5–20 V); fixed 2.5 V output; larger footprint (13.5 × 12.5 mm). | Better for designers prioritizing layout simplicity and EMI reduction over board area; not suitable for ultra-dense or weight-constrained designs. | Choose LMZ12003TZE/NOPB when minimizing design risk and validation effort outweighs PCB area constraints - includes integrated magnetics and shielding. |
Compared with TPS54315MPWPREP, the TPS54315PWPR offers identical functionality at lower cost but lacks radiation tolerance and –55°C capability, while the LMZ12003TZE/NOPB trades board area for reduced design cycle time and inherent EMI performance - making it ideal for rapid prototyping in non-space-critical military systems.
Availability
TPS54315MPWPREP is available at Aetrix Electronics and suitable for avionics power distribution, satellite onboard computers, downhole telemetry systems, and military radar signal processing requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for TPS54315MPWPREP 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 and defense component development.
The TPS54315MPWPREP 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, latch-up immunity, and long-term reliability are mandatory.
FAQ
What is the output voltage tolerance of the TPS54315MPWPREP over temperature and load?
The TPS54315MPWPREP delivers a fixed 2.5 V output with ±3% regulation across the full operating range: –55°C to +125°C junction temperature, 3 V to 6 V input, and 0 A to 3 A load. This specification is guaranteed by factory trimming of the internal voltage reference and error amplifier offset, ensuring consistent performance in space and avionics applications without external feedback adjustment.
Does the TPS54315MPWPREP require external compensation components?
No, the TPS54315MPWPREP features an internally compensated control loop optimized for standard 4.7–10 µH inductors and typical ceramic output capacitors. This eliminates external Type-II or Type-III compensation networks, reducing BOM count and layout sensitivity while maintaining stability across line, load, and temperature variations - a key advantage for high-reliability designs where component count must be minimized.
How is thermal management implemented in the TPS54315MPWPREP package?
The TPS54315MPWPREP uses a 20-pin HTSSOP (PWP) package with an exposed PowerPAD™ thermal pad that must be soldered directly to a dedicated AGND copper plane. With proper layout - including ≥6 thermal vias under the pad and connection to ≥3″×3″ 1-oz copper - it achieves 26°C/W junction-to-ambient thermal resistance, enabling full 3-A operation at 125°C ambient without a heatsink.
Can the TPS54315MPWPREP be synchronized to an external clock?
Yes, the TPS54315MPWPREP supports external synchronization over 330–700 kHz by driving a clean clock signal into the FSEL pin while configuring the RT pin with a resistor set to 80% of the target frequency. This capability allows EMI reduction through frequency dithering or alignment with system master clocks - critical in radar and communications systems where spectral interference must be avoided.
What protection features does the TPS54315MPWPREP include?
The TPS54315MPWPREP integrates peak current limiting (trip point: 4–6.5 A), thermal shutdown (135–165°C), undervoltage lockout (2.95 V start, 2.8 V stop), and open-drain power-good signaling (90% VREF threshold). These features operate autonomously without external circuitry, enabling robust fault handling in unattended or remote deployments such as satellite subsystems and downhole instrumentation.
TPS54315MPWPREP 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):
- 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
TPS54315MPWPREP FAQ
1.How can I place an order for TPS54315MPWPREP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54315MPWPREP 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 TPS54315MPWPREP reliable?
The price and inventory of TPS54315MPWPREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54315MPWPREP is usually 5 days.
3.What payment methods are accepted for TPS54315MPWPREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54315MPWPREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54315MPWPREP?
TPS54315MPWPREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54315MPWPREP 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 TPS54315MPWPREP?
For technical support, including TPS54315MPWPREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54315MPWPREP requirements.
6.How does Aetrix verify that TPS54315MPWPREP is sourced from the original manufacturer or authorized distributors?
All TPS54315MPWPREP 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 TPS54315MPWPREP meets industry standards.
7.What is the process for return or replacement of TPS54315MPWPREP?
All TPS54315MPWPREP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54315MPWPREP, 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 TPS54315MPWPREP part is unused and in its original packaging.
Return procedure for TPS54315MPWPREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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