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Texas Instruments TPS54315PWPR
- Part No.:
- TPS54315PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54315PWPR.pdf
- Description:
- IC REG BUCK 2.5V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS54315PWPR from Texas Instruments is a 3-A synchronous buck PWM converter with integrated 60-mΩ high- and low-side MOSFETs, fixed 2.5-V output voltage (±2.5% over temperature/load), 3–6-V input range, and internal compensation. It delivers point-of-load regulation for FPGAs and microprocessors in space-constrained industrial and computing systems.
For engineers reviewing the TPS54315PWPR datasheet, TPS54315PWPR pinout, TPS54315PWPR application, or TPS54315PWPR equivalent, key selection criteria include its 2.5-V fixed output, HTSSOP-20 PowerPAD™ thermal package, 350/550-kHz fixed or 280–700-kHz adjustable switching frequency, and integrated powergood (PWRGD) and slow-start/enable (SS/ENA) functions.
Technical Context
The TPS54315PWPR implements a voltage-mode synchronous buck topology with an internally compensated error amplifier (26 dB 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.
Startup is managed by a dual-function SS/ENA pin enabling device control and external slow-start timing (4.7 ms typical internal ramp), while UVLO (2.95 V start / 2.80 V stop, 0.16 V hysteresis) and thermal shutdown (150 °C trip, 10 °C hysteresis) provide fault protection. The VBIAS regulator supplies 2.70–2.90 V to internal circuitry and supports external bypassing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2.5% over –40°C to 125°C, 0–3 A load, 3–6 V input - enables direct replacement of LDOs in 2.5-V rail applications. |
| Input Voltage Range | 3 V to 6 V - supports single-cell Li-ion, 3.3-V/5-V intermediate bus, and USB-powered systems without external pre-regulation. |
| Continuous Output Current | 3 A - sustains full load under worst-case thermal conditions (TJ ≤ 125°C) with proper PCB copper and thermal vias. |
| Switching Frequency | 350 kHz or 550 kHz (fixed, via FSEL); 280–700 kHz (adjustable, via RT resistor) - balances efficiency vs. size trade-offs for inductor and capacitor selection. |
| Power MOSFET rDS(on) | High-side: 88 mΩ, low-side: 59 mΩ (TJ = 25°C, VIN = 6 V) - minimizes conduction loss and enables >90% peak efficiency at 2.5 V/2 A. |
| Quiescent Current | 6.2–12.8 mA (depending on frequency mode) - ensures low no-load power draw in always-on subsystems. |
| Thermal Resistance θJA | 26.0 °C/W (with PowerPAD™ soldered) - requires ≥10 thermal vias to AGND plane for reliable 3-A operation at 85°C ambient. |
Pinout & Package
TPS54315PWPR is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ for improved heat dissipation. The package measures 6.5 mm × 4.4 mm × 1.2 mm and requires solder connection of the PowerPAD™ to AGND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return path for feedback divider, SS/ENA capacitor, VBIAS bypass, and RT/FSEL resistors; must be connected to PowerPAD™. |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct connection to output voltage sense point enables accurate regulation and fast transient response. |
| PWRGD (Pin 4) | Open-drain power-good indicator | Asserts high when VSENSE ≥ 90% of 0.891-V reference; used for processor reset sequencing and fault signaling. |
| BOOT (Pin 5) | Bootstrap supply for high-side driver | Requires 0.022–0.1 µF ceramic capacitor to PH; enables floating gate drive for N-channel high-side MOSFET. |
| PH (Pins 6–10) | Phase node (switching node) | Connection point between internal MOSFETs and external output inductor; high di/dt node requiring tight layout. |
| RT (Pin 20) | Frequency setting resistor input | Connects to AGND via resistor (e.g., 100 kΩ for 500 kHz); enables precise adjustment across 280–700 kHz range. |
| SS/ENA (Pin 18) | Slow-start/enable control | Logic-high (>1.2 V) enables operation; external capacitor extends soft-start time beyond internal 4.7 ms default. |
| VBIAS (Pin 17) | Internal bias regulator output | Supplies 2.70–2.90 V to internal circuitry; requires 0.1–1.0 µF X7R/X5R ceramic bypass to AGND near pin. |
| VIN (Pins 14–16) | Main input supply | Accepts 3–6 V; each pin carries portion of input current - bypass individually with 1–10 µF ceramic capacitors to PGND. |
| PGND (Pins 11–13) | Power ground return | High-current return for low-side MOSFET and inductor; must connect to large copper pour and input/output capacitor negatives. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFETs | Eliminates external discrete switches and reduces total solution footprint by >40% versus controller + external FET designs. |
| Internally compensated control loop | Removes need for external compensation network - simplifies design and guarantees stability with standard 4.7–10 µH inductors. |
| Fast transient response | 10–20 µs recovery time from load step (0–3 A) due to high-bandwidth error amplifier and adaptive dead-time control. |
| Adjustable switching frequency (280–700 kHz) | Enables optimization of magnetic size vs. efficiency - e.g., 700 kHz allows <10 mm² inductor in portable applications. |
| Powergood (PWRGD) with hysteresis | Provides clean, noise-immune system reset signal (35 µs deglitch, 3% Vref hysteresis) for FPGA/microprocessor sequencing. |
Applications
| Point-of-Load Regulation for FPGAs | Low-Voltage Industrial Control Systems |
|---|---|
|
Use Scenario: Powering Xilinx Artix-7 or Intel Cyclone V FPGA core rails requiring stable 2.5-V supply with fast load-step response. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering 2.5 V at up to 3 A with PWRGD-synchronized configuration and thermal margin for 85°C ambient. Use Value: Integrated MOSFETs and internal compensation reduce BOM count by 7 components versus discrete solutions, accelerating FPGA carrier board qualification. |
Use Scenario: Generating 2.5-V logic supply for PLC I/O modules operating in extended temperature environments (−40°C to 85°C). IC Role / Device Role / Timing Role: Fixed-output buck converter with UVLO (2.95 V) and thermal shutdown (150°C) ensuring reliable startup and fault containment in unregulated 5-V bus systems. Use Value: 26.0 °C/W θJA with PowerPAD™ enables full 3-A output without heatsink - reducing enclosure size and assembly cost. |
| Optical Transceiver Line Cards | Notebook PC Subsystem Power |
|
Use Scenario: Supplying 2.5-V bias to SFP+ transceiver lasers and TI SN65LVDS32 differential receivers in telecom line cards. IC Role / Device Role / Timing Role: High-efficiency (≥92% at 2.5 V/1.5 A) synchronous buck with low-noise VBIAS output supporting analog front-end circuitry. Use Value: 0.16-V UVLO hysteresis and 35-µs PWRGD deglitch prevent false resets during hot-swap events in redundant power architectures. |
Use Scenario: Providing auxiliary 2.5-V rail for DDR3 memory termination or embedded controller peripherals in thin-and-light notebooks. IC Role / Device Role / Timing Role: Compact HTSSOP-20 regulator with adjustable frequency (via RT) enabling EMI spread-spectrum tuning to meet CISPR-22 Class B limits. Use Value: 4.7-ms internal slow-start prevents inrush current into downstream 1000-µF bulk capacitance - eliminating need for external inrush limiters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54315PWP | Same silicon, identical electrical specs, but non-tape-and-reel packaging (bulk) and no PowerPAD™ thermal enhancement. | Suitable only for low-power prototyping or non-thermal-critical applications; not recommended for production 3-A loads. | Select TPS54315PWPR for volume production requiring guaranteed thermal performance and automated assembly compatibility. |
| MP2315DJ-LF-Z | Monolithic 3-A buck with 2.5-V fixed output, but 4.5–28-V input range, higher quiescent current (250 µA), and no PWRGD or SS/ENA pins. | Better suited for wide-input industrial sensors; lacks sequencing and fault signaling needed for FPGA/microprocessor systems. | Choose TPS54315PWPR when power-good signaling, precise slow-start control, and 3–6-V input optimization are required. |
Compared with TPS54315PWP, the TPS54315PWPR provides verified PowerPAD™ thermal performance essential for sustained 3-A operation, while MP2315DJ-LF-Z trades critical system-level features (PWRGD, SS/ENA) for wider input range - making TPS54315PWPR the optimal choice for tightly regulated 2.5-V point-of-load designs.
Availability
TPS54315PWPR is available at Aetrix Electronics and suitable for FPGA power delivery, industrial PLC modules, optical transceiver line cards, and notebook subsystem power requiring stable component supply and long-term lifecycle support.
Supply support for TPS54315PWPR 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 technologies, with over 50 years of innovation in high-reliability power conversion ICs.
The TPS54315PWPR belongs to TI's SWIFT™ family of integrated synchronous buck regulators, designed specifically for high-density, low-voltage point-of-load applications in computing, communications, and industrial equipment where minimal external components and thermal efficiency are critical.
FAQ
What is the output voltage tolerance of the TPS54315PWPR over temperature and load?
The TPS54315PWPR provides a fixed 2.5-V output with ±2.5% initial accuracy at 25°C and maintains that tolerance across –40°C to 125°C junction temperature and 0–3-A load range, as specified in Section 6.5 of the SLVS416C datasheet. This stability is achieved through factory-trimmed bandgap reference and internal error amplifier compensation.
Does the TPS54315PWPR require external compensation components?
No, the TPS54315PWPR is internally compensated and does not require external compensation network components. Its control loop is optimized for standard 4.7–10 µH inductors and associated output capacitors, eliminating the need for external RC networks and reducing design risk and BOM count.
How is the switching frequency configured on the TPS54315PWPR?
The TPS54315PWPR supports three frequency modes: 350 kHz (FSEL ≤ 0.8 V), 550 kHz (FSEL ≥ 2.5 V), or adjustable 280–700 kHz (FSEL floating, RT resistor to AGND). The RT resistor value directly sets frequency per the equation fs ≈ 106/R (R in ohms), e.g., 100 kΩ yields ~500 kHz.
What thermal design considerations apply to the TPS54315PWPR in continuous 3-A operation?
For continuous 3-A operation, the TPS54315PWPR requires soldering the PowerPAD™ to a minimum 1-in² AGND copper pour with ≥10 thermal vias (0.3-mm diameter) to inner ground layers. With this layout, θJA is 26.0 °C/W, allowing safe operation up to 85°C ambient at full load per Section 6.3 of the datasheet.
Can the TPS54315PWPR sink current during light-load or transient conditions?
Yes, the TPS54315PWPR supports continuous current sinking during output voltage undershoot events, such as rapid load removal. Its synchronous architecture allows the low-side MOSFET to actively pull the output toward ground, enabling fast recovery and maintaining regulation even when sourcing current drops to zero.
TPS54315PWPR 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
TPS54315PWPR FAQ
1.How can I place an order for TPS54315PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54315PWPR 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 TPS54315PWPR reliable?
The price and inventory of TPS54315PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54315PWPR is usually 5 days.
3.What payment methods are accepted for TPS54315PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54315PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54315PWPR?
TPS54315PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54315PWPR 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 TPS54315PWPR?
For technical support, including TPS54315PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54315PWPR requirements.
6.How does Aetrix verify that TPS54315PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54315PWPR 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 TPS54315PWPR meets industry standards.
7.What is the process for return or replacement of TPS54315PWPR?
All TPS54315PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54315PWPR, 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 TPS54315PWPR part is unused and in its original packaging.
Return procedure for TPS54315PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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