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Texas Instruments TPS544B25RVFT
- Part No.:
- TPS544B25RVFT
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS544B25RVFT.pdf
- Description:
- IC REG BUCK ADJ 20A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
TPS544B25RVFT from Texas Instruments is a PMBus™-compliant 20-A synchronous buck converter with integrated NexFET™ power stage, operating from 4.5 V to 18 V input and delivering 0.5 V to 5.5 V output. It features 500 kHz nominal switching frequency, 0.5% reference accuracy at ≥600 mV, lossless low-side current sensing, and differential remote sensing for precision regulation in high-density server and networking power rails.
For engineers reviewing the TPS544B25RVFT datasheet, TPS544B25RVFT pinout, TPS544B25RVFT application, or TPS544B25RVFT equivalent, this page delivers verified electrical specs, thermal performance data, PMBus programmability details, and real-world efficiency curves at VIN = 12 V and multiple VOUT settings - all critical for AVS-capable point-of-load designs requiring tight voltage margining and telemetry.
Technical Context
The TPS544B25RVFT implements voltage-mode control with input feed-forward for fast transient response and monotonic start-up into pre-biased outputs. Its integrated 5.5-mΩ high-side and 2.0-mΩ low-side MOSFETs enable high-efficiency operation up to 20 A without external drivers or current-sense resistors.
PMBus 1.2 compliance enables full digital configuration: VOUT_COMMAND transition rate (0.067–1.5 mV/µs), overcurrent protection with thermal compensation, PGOOD/OT/UV/OV fault thresholds, and real-time reporting of output voltage, current, and external temperature via 2N3904 interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 20 A continuous - supports single-rail CPU/GPU core power in enterprise SSDs and base stations without parallel phases. |
| Input Voltage Range | 4.5 V to 18 V - compatible with 12-V intermediate bus architectures and wide-input industrial systems. |
| Output Voltage Range | 0.5 V to 5.5 V - covers DDR memory, FPGA I/O, ASIC cores, and adaptive voltage scaling (AVS) down to sub-1-V levels. |
| Switching Frequency | 200 kHz to 1 MHz (pin-strappable or sync-capable) - enables optimization between efficiency (lower fSW) and size (higher fSW). |
| Reference Accuracy | ±0.5% at ≥600 mV - ensures tight output regulation under load transients and temperature variation for sensitive logic rails. |
| Thermal Shutdown | 135°C to 155°C (typ. 145°C) with 15–25°C hysteresis - protects against sustained overload while allowing safe recovery after cooling. |
| PMBus Interface | Slave-mode operation up to 400 kHz - enables system-level telemetry, fault logging, and dynamic VOUT adjustment without host MCU intervention. |
Pinout & Package
TPS544B25RVFT uses a 40-pin LQFN (RVF) package with 5.0 mm × 7.0 mm body and single thermal pad on bottom for PCB-level heat dissipation. Thermal resistance: RθJA = 27.4°C/W, RθJC(bot) = 1.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 8–12) | Switch node | High-current connection to external inductor; requires low-inductance layout and boot capacitor (100 nF) to BOOT. |
| VIN (Pins 21–25) | Power stage input | Direct connection to 4.5–18 V input rail; must be bypassed with low-ESR capacitors near thermal pad. |
| PGND (Pin 26) | Power ground return | Separate low-impedance path for power stage currents; tied to thermal tab and system GND at single point. |
| AGND (Pin 38) | Analog ground reference | Return for FB, COMP, and PMBus signals; isolated from PGND except at thermal tab to minimize noise coupling. |
| FB (Pin 34) | Feedback input | Connects to resistor divider from VOUT; sets regulation point with ±0.5% accuracy at ≥600 mV. |
| VOUTS+ / VOUTS− (Pins 31–32) | Differential remote sense | Enables Kelvin sensing at load; eliminates IR drop error in high-current applications like server VRMs. |
| CLK / DATA (Pins 4–5) | PMBus interface | Standard SMBus 2-wire interface for configuration, telemetry, and fault reporting per PMBus 1.2 spec. |
| RT (Pin 40) | Frequency setting | Resistor-to-AGND sets fSW from 200 kHz to 1 MHz; default 40.2 kΩ yields 500 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NexFET™ power stage | 5.5-mΩ high-side + 2.0-mΩ low-side MOSFETs eliminate external drivers and sense resistors, reducing BOM count and layout area. |
| Lossless low-side current sensing | Eliminates power loss and board space associated with shunt resistors while enabling accurate real-time IOUT reporting (±15% accuracy ≥20 A). |
| Differential remote sensing | Compensates for PCB trace resistance up to 10 mΩ, maintaining ±0.5% regulation accuracy at the load under 20-A step loads. |
| Adaptive voltage scaling (AVS) | VOUT_COMMAND register allows dynamic output adjustment via PMBus; transition rate programmable from 0.067 to 1.5 mV/µs for controlled slew control. |
| Monotonic start-up into pre-biased output | Prevents reverse current flow during hot-plug or multi-rail sequencing, protecting downstream FPGAs and ASICs with powered I/O. |
| External temperature monitoring | Supports 2N3904 transistor on TSNS/SS pin for board-level thermal telemetry with ±5°C accuracy across –40°C to 165°C range. |
Applications
| Enterprise Storage SSD | 5G Base Station RF Power Amplifier |
|---|---|
|
Use Scenario: High-current, low-voltage core supply for NAND controller and DRAM cache in NVMe SSDs with thermal constraints. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 0.8 V @ 18 A with AVS support for dynamic power gating. Use Value: Integrated power stage and 0.5% reference accuracy maintain stable VDD under rapid 0–18 A load steps, preventing NAND write errors. |
Use Scenario: Bias supply for GaN RF power amplifiers requiring precise, telemetry-enabled voltage control in compact macro-cell designs. IC Role / Device Role / Timing Role: Digitally configurable buck converter providing 5.0 V @ 12 A with real-time current monitoring and overtemperature shutdown. Use Value: PMBus telemetry reports IOUT and external temperature to baseband controller, enabling adaptive PA bias tuning and thermal derating. |
| Ethernet Switch Line Card | AI Accelerator Module |
|
Use Scenario: Multi-rail power delivery for 100G/400G switch ASICs with strict sequencing, margining, and fault logging requirements. IC Role / Device Role / Timing Role: Secondary POL regulator generating 1.2 V @ 20 A for SerDes banks with differential remote sensing and PGOOD coordination. Use Value: Monotonic start-up prevents back-driving of powered SerDes lanes; PGOOD latching on UV/OV faults enables system-level diagnostics. |
Use Scenario: Core voltage supply for edge AI inference accelerators with dynamic workload-driven voltage scaling and thermal throttling. IC Role / Device Role / Timing Role: AVS-capable buck converter delivering 0.75 V @ 16 A with programmable VOUT transition rate and external temperature feedback. Use Value: VOUT_COMMAND register adjusts output in <100 µs to match compute load, reducing idle power by up to 22% versus fixed-voltage solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544C25RVFT | 30-A rated output, higher RDS(on) (5.5/2.0 mΩ same), identical pinout and PMBus feature set. | Required where peak current exceeds 20 A; supports higher-power ASICs without changing PCB layout. | Select when design headroom demands >20 A continuous or transient current capability. |
| MP8770GQ-Z | 20-A monolithic buck with I²C interface (not PMBus), no remote sensing, lower integration (external bootstrap cap required). | Suitable for cost-sensitive industrial controls where telemetry and AVS are not required. | Choose only if PMBus telemetry, differential sensing, and AVS are unnecessary and BOM cost is prioritized over digital control. |
Compared with TPS544C25RVFT, the TPS544B25RVFT offers matched functionality at 20-A rating with identical footprint and firmware compatibility, while MP8770GQ-Z trades digital configurability and sensing precision for lower unit cost and simpler implementation.
Availability
TPS544B25RVFT is available at Aetrix Electronics and suitable for enterprise storage SSDs, 5G base station RF modules, and AI accelerator power rails requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TPS544B25RVFT 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 TPS544x25 product line targets high-density, digitally controlled point-of-load applications in servers, networking equipment, and storage systems - designed for PMBus-based AVS, telemetry, and thermal-aware power delivery.
FAQ
What is the maximum output current rating of the TPS544B25RVFT?
The TPS544B25RVFT is rated for 20 A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its overcurrent fault threshold is factory-defaulted to 24 A and programmable from 5 A to 36 A via PMBus register IOUT_OC_FAULT_LIMIT, enabling precise system-level protection coordination.
Does the TPS544B25RVFT support adaptive voltage scaling (AVS)?
Yes, the TPS544B25RVFT supports AVS through its PMBus VOUT_COMMAND register, allowing dynamic output voltage adjustment in real time. The transition rate is programmable from 0.067 mV/µs to 1.5 mV/µs, and the device maintains ±0.5% reference accuracy at ≥600 mV - essential for reliable AVS operation in CPU and FPGA core rails.
What package type and thermal characteristics does the TPS544B25RVFT use?
The TPS544B25RVFT uses a 40-pin LQFN (RVF) package measuring 5.0 mm × 7.0 mm with an exposed thermal pad. Its junction-to-board thermal resistance (RθJB) is 4.2°C/W, and junction-to-case (bottom) is 1.0°C/W. These values assume standard 2-oz copper, 4 thermal vias under the pad, and proper solder coverage - critical for sustaining 20-A operation at 125°C junction temperature.
Can the TPS544B25RVFT operate without a PMBus host controller?
Yes, the TPS544B25RVFT can operate in standalone mode using pin-strapped defaults: VOUT set by VSET resistor, switching frequency set by RT resistor, and protection thresholds configured via hardware strapping. PMBus is optional for advanced configuration and telemetry; basic regulation functions remain fully operational without it.
How does the TPS544B25RVFT handle start-up into a pre-biased output?
The TPS544B25RVFT implements monotonic start-up into pre-biased outputs by disabling the high-side MOSFET until the feedback voltage rises above the regulation threshold. This prevents reverse current flow and potential damage to downstream components such as powered FPGAs or ASICs - a key requirement in hot-swap and multi-rail sequencing applications.
TPS544B25RVFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 40-PowerLFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 20A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-LQFN-CLIP (7x5)
TPS544B25RVFT FAQ
1.How can I place an order for TPS544B25RVFT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS544B25RVFT 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 TPS544B25RVFT reliable?
The price and inventory of TPS544B25RVFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS544B25RVFT is usually 5 days.
3.What payment methods are accepted for TPS544B25RVFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS544B25RVFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS544B25RVFT?
TPS544B25RVFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS544B25RVFT 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 TPS544B25RVFT?
For technical support, including TPS544B25RVFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS544B25RVFT requirements.
6.How does Aetrix verify that TPS544B25RVFT is sourced from the original manufacturer or authorized distributors?
All TPS544B25RVFT 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 TPS544B25RVFT meets industry standards.
7.What is the process for return or replacement of TPS544B25RVFT?
All TPS544B25RVFT units undergo pre-shipment inspection (PSI). If there is an issue with TPS544B25RVFT, 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 TPS544B25RVFT part is unused and in its original packaging.
Return procedure for TPS544B25RVFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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