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Texas Instruments TPS544B20RVFT
- Part No.:
- TPS544B20RVFT
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS544B20RVFT.pdf
- Description:
- IC REG BUCK ADJ 20A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:672
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Product details
Overview
TPS544B20 from Texas Instruments is a PMBus-enabled, 20-A synchronous buck converter IC with integrated NexFET™ power stage, operating from 4.5 V to 18 V input and delivering 0.6 V to 5.5 V output. It features 4.5-mΩ high-side and 2.0-mΩ low-side MOSFETs, 600-mV ±0.5% reference voltage, and supports D-CAP™/D-CAP2™ control modes for fast transient response in server and networking power rails.
For engineers reviewing the TPS544B20 datasheet, TPS544B20 pinout, TPS544B20 application, or TPS544B20 equivalent, key selection considerations include its 5 mm × 7 mm LQFN-40 package with thermal pad, lossless current sensing, differential remote sensing capability, and programmable overcurrent/thermal fault responses via PMBus interface.
Technical Context
The TPS544B20 implements dual-mode control architecture-D-CAP™ for direct feed-forward response to input voltage changes and D-CAP2™ for enhanced light-load efficiency and stability with ceramic output capacitors. Its integrated power stage eliminates external gate drivers and reduces layout complexity.
It delivers real-time telemetry including output voltage (±2.0% accuracy), output current (±15% above 20 A), and external temperature (±8°C), all accessible via PMBus commands. Fault handling is configurable: overcurrent can trigger hiccup or latch-off, while thermal shutdown activates at 135°C–155°C with 20°C–30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 20 A continuous; enables single-rail CPU/GPU core power in space-constrained 1U servers. |
| Input Voltage Range | 4.5 V to 18 V; compatible with 12-V intermediate bus architectures common in enterprise switches and storage. |
| Output Voltage Range | 0.6 V to 5.5 V; supports DDR memory, ASICs, FPGAs, and SoCs requiring precise low-voltage regulation. |
| Reference Voltage | 600 mV ±0.5% (–40°C to 125°C); ensures tight output tolerance without external resistor divider calibration. |
| Switching Frequency | 250 kHz to 1000 kHz (programmable via RT resistor); allows optimization of inductor size vs. efficiency trade-off. |
| Power Stage RDS(on) | 4.5 mΩ HS / 2.0 mΩ LS at 25°C; minimizes conduction loss and enables >90% peak efficiency at 12-VIN/1-VOUT. |
| PMBus Compliance | Fully compliant with PMBus 1.2; supports read/write of VOUT, IOUT, temperature, fault logs, and configuration registers. |
Pinout & Package
TPS544B20 is housed in a 40-pin LQFN package (5.0 mm × 7.0 mm, 0.5-mm pitch) with exposed thermal pad for enhanced heat dissipation. The package includes single thermal pad connected to GND, requiring minimum 8-mil PCB trace to PGND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 8–12) | Switch node | High-current switched output connecting to inductor; multiple pins reduce parasitic inductance and improve current sharing. |
| VIN (Pins 21–25) | Power stage input | Dedicated high-current input path; requires multi-ceramic capacitor bank directly to GND for EMI suppression. |
| GND (Pins 14–20) | Power ground return | Low-impedance return for power stage; separate from AGND to avoid noise coupling into control circuitry. |
| AGNDSNS (Pin 13) | Analog ground sense | Kelvin connection point for precision current measurement; internally tied to thermal pad but must not be externally shorted to GND. |
| FB (Pin 34) | Feedback input | Regulates output to 600 mV reference; supports remote sensing via VOUTS+/VOUTS– differential pair for load-point accuracy. |
| ADDR0/ADDR1 (Pins 3,2) | PMBus address setting | Resistor-programmable address bits enable up to 64 unique PMBus addresses on shared bus without address conflict. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing | Eliminates IR drop error by measuring output voltage directly at load via VOUTS+/VOUTS–, enabling ±0.5% regulation at point-of-load. |
| Lossless low-side current sensing | Uses internal RDS(on) of low-side FET instead of external shunt, reducing BOM count and board area while maintaining ±15% current reporting accuracy. |
| Monotonic start-up into pre-biased output | Prevents reverse current flow during hot-swap or partial system power-up, protecting downstream components in modular power systems. |
| Output voltage margining and trim | Supports ±60 mV FB voltage adjustment in 2-mV steps via PMBus, enabling in-system validation of supply margin without hardware change. |
| Programmable fault responses | Configurable overcurrent, overtemperature, and UV/OV fault actions (restart vs. latch-off) per system safety requirements, stored in nonvolatile memory. |
Applications
| Server CPU Core Power | Enterprise SSD Power Rail |
|---|---|
Use Scenario: Delivering tightly regulated 0.8–1.2 V at up to 20 A to multi-core x86 processors in 1U rack servers. IC Role / Device Role / Timing Role: Primary point-of-load regulator with PMBus telemetry for dynamic voltage scaling and health monitoring. Use Value: Enables real-time current/voltage reporting for thermal throttling decisions and supports D-CAP2™ mode for stable operation with low-ESR ceramic capacitors. |
Use Scenario: Providing 3.3 V or 1.8 V power to NVMe SSD controllers and NAND flash arrays in high-density storage enclosures. IC Role / Device Role / Timing Role: High-efficiency, digitally configurable DC-DC converter with fast transient response to handle bursty PCIe traffic loads. Use Value: Integrated power stage and 5 mm × 7 mm footprint reduce solution size by >30% versus discrete controller + DrMOS solutions. |
| Ethernet Switch ASIC Supply | Optical Transport Line Card |
Use Scenario: Generating 0.9 V, 1.2 V, and 1.8 V rails for packet processing ASICs in 10/25/100 GbE switches with strict ripple and transient requirements. IC Role / Device Role / Timing Role: Digitally managed POL converter supporting remote firmware updates and fault logging via PMBus. Use Value: Differential sensing and programmable soft-start prevent brownouts during simultaneous rail bring-up across multi-rail switch designs. |
Use Scenario: Powering DSPs, DACs, and laser drivers in coherent optical modules where thermal management and long-term reliability are critical. IC Role / Device Role / Timing Role: High-density, thermally robust buck converter with external temperature monitoring via TSNS pin and 2N3904 transistor. Use Value: Junction temperature monitoring and configurable thermal shutdown (120°C–165°C range) ensure safe operation under variable ambient conditions in telecom chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544C20RVFT | 30-A rated output; identical pinout, package, and feature set; higher RDS(on) stack (4.5 mΩ/2.0 mΩ same, but optimized for higher current). | Suitable for higher-power ASICs or multi-phase scaling where 30-A headroom is required. | Select TPS544C20 when load current exceeds 20 A or future-proofing for higher-power derivatives is needed. |
| ISL91211AIRZ-T7A | 12-A rating, 2.5-V to 5.5-V input, no PMBus; uses adaptive on-time control; smaller 3.5 mm × 3.5 mm QFN. | Better suited for portable or battery-powered applications where digital interface and high current are unnecessary. | Choose ISL91211A for cost-sensitive, lower-current designs lacking telemetry or bus control requirements. |
Compared with TPS544B20, TPS544C20 offers higher current capacity in identical form factor for scalability, while ISL91211A trades digital control and current rating for compact size and lower quiescent current-making each suitable for distinct power architecture tiers.
Availability
TPS544B20 is available at Aetrix Electronics and suitable for server motherboard design, enterprise SSD power delivery, and optical transport equipment requiring stable component supply and long-term industrial lifecycle support.
Supply support for TPS544B20 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 and embedded processing technologies, with decades of expertise in power management ICs for mission-critical infrastructure.
The TPS544x20 product line was designed specifically for high-density, digitally controlled point-of-load applications in datacenter, networking, and telecom equipment-emphasizing integration, telemetry, and thermal resilience.
FAQ
What is the maximum supported switching frequency of the TPS544B20?
The TPS544B20 supports a programmable switching frequency range from 250 kHz to 1000 kHz, set by an external resistor on the RT pin. At the default RRT = 38.3 kΩ, it operates at 500 kHz, balancing efficiency, inductor size, and transient response for typical 12-V input applications.
Does the TPS544B20 require external MOSFETs?
No, the TPS544B20 integrates a stacked NexFET™ power stage with 4.5-mΩ high-side and 2.0-mΩ low-side MOSFETs. This eliminates the need for external power switches, gate drivers, or associated bias supplies-reducing bill-of-materials and layout complexity.
How does the TPS544B20 achieve accurate current monitoring without a sense resistor?
The TPS544B20 uses lossless, low-side MOSFET RDS(on)-based current sensing. It measures voltage drop across the internal low-side FET during conduction, eliminating external shunts while maintaining ±15% accuracy for currents ≥20 A and ±3 A for lower loads.
Can the TPS544B20 operate with a pre-biased output voltage?
Yes, the TPS544B20 supports monotonic start-up into pre-biased outputs. Its control architecture prevents reverse current flow during power-up, making it suitable for hot-swap and partial-power scenarios in modular server and telecom systems.
What thermal protection features does the TPS544B20 include?
The TPS544B20 includes junction thermal shutdown at 135°C–155°C (configurable fault limit), with 20°C–30°C hysteresis. It also supports external temperature monitoring via the TSNS pin using a 2N3904 transistor, enabling system-level thermal management beyond die temperature.
TPS544B20RVFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP™, D-CAP2™
- 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):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 20A
- Frequency - Switching:
- Selectable
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-LQFN-CLIP (7x5)
TPS544B20RVFT FAQ
1.How can I place an order for TPS544B20RVFT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS544B20RVFT 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 TPS544B20RVFT reliable?
The price and inventory of TPS544B20RVFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS544B20RVFT is usually 5 days.
3.What payment methods are accepted for TPS544B20RVFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS544B20RVFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS544B20RVFT?
TPS544B20RVFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS544B20RVFT 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 TPS544B20RVFT?
For technical support, including TPS544B20RVFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS544B20RVFT requirements.
6.How does Aetrix verify that TPS544B20RVFT is sourced from the original manufacturer or authorized distributors?
All TPS544B20RVFT 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 TPS544B20RVFT meets industry standards.
7.What is the process for return or replacement of TPS544B20RVFT?
All TPS544B20RVFT units undergo pre-shipment inspection (PSI). If there is an issue with TPS544B20RVFT, 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 TPS544B20RVFT part is unused and in its original packaging.
Return procedure for TPS544B20RVFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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