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Texas Instruments TPS549A20RVET
- Part No.:
- TPS549A20RVET
- Manufacturer:
- Texas Instruments
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
TPS549A20RVET.pdf
- Description:
- IC REG BUCK ADJ 15A 28VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,942
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Product details
Overview
TPS549A20RVET from Texas Instruments is a 15-A synchronous step-down DC-DC converter with PMBus™ interface, D-CAP3™ control, and integrated 9.9-mΩ high-side / 4.3-mΩ low-side MOSFETs. It operates from 1.5 V to 20 V input (4.5–25 V bias), delivers 0.6–5.5 V output, and supports forced continuous conduction mode (FCCM) for FPGA and DSP power rails in server and telecom point-of-load systems.
For engineers reviewing the TPS549A20RVET datasheet, TPS549A20RVET pinout, TPS549A20RVET application, or TPS549A20RVET equivalent, key selection criteria include its 28-pin VQFN-CLIP package, PMBus-programmable soft-start (1–8 ms), eight selectable switching frequencies (200–1000 kHz), ±0.5% reference voltage tolerance over –40°C to 85°C, and hiccup-mode overcurrent protection with external trip resistor configuration.
Technical Context
The TPS549A20RVET implements adaptive on-time D-CAP3™ control using an internal ramp generator synchronized to switching frequency - eliminating external compensation while enabling fast load-step response (<10 µs recovery). Its PMBus™ interface provides real-time telemetry (VOUT, IOUT, temperature) and programmable fault thresholds (OVP/UVP, PGOOD delay, power-on delay).
It integrates a 5-V VREG LDO (4.65–5.45 V, 200 mA max), bootstrap gate driver (VBST), and thermal shutdown at 140°C with 40°C hysteresis. The device supports pre-biased startup, auto-skipping Eco-Mode™ for light-load efficiency, and FCCM operation to maintain tight output voltage regulation under dynamic loads typical of high-performance processors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 15 A continuous - supports high-current POL rails for FPGAs and ASICs without external current sharing. |
| Input Voltage Range | 1.5 V to 20 V (with snubber); 4.5 V to 25 V for VDD bias - enables direct connection to intermediate bus or wide-input industrial supplies. |
| Output Voltage Range | 0.6 V to 5.5 V - covers core voltages for modern processors, memory, and I/O interfaces. |
| Reference Voltage | 600 mV ±0.5% (–40°C to 85°C) - ensures precise feedback accuracy for sub-1.0 V digital rail regulation. |
| Switching Frequency | 200 kHz to 1 MHz (8 PMBus-selectable steps) - allows optimization of size (higher fSW) vs. efficiency (lower fSW) per design constraints. |
| Control Mode | D-CAP3™ with adaptive on-time - delivers <10 µs load transient response without external loop compensation components. |
| Package | 28-pin VQFN-CLIP (4.5 mm × 3.5 mm) with exposed thermal pad - enables high-power density and low thermal resistance (θJCbot = 2.2°C/W). |
Pinout & Package
TPS549A20RVET uses a 28-pin VQFN-CLIP package (4.5 mm × 3.5 mm) with an exposed thermal pad for enhanced thermal performance. Pin numbering follows top-view layout with pins 1–14 on top row (left-to-right), 15–28 on bottom row (right-to-left), and thermal pad centered beneath the die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADDR) | PMBus address configuration | Resistor divider between VREG and GND sets unique I²C address for multi-device bus communication. |
| 2 (PGOOD) | Open-drain power-good status | Signals valid output after soft-start; asserts high within 1 ms when FB is within ±8% of target, deasserts within 2 µs if outside ±16%. |
| 3 (EN) | Enable input | Active-high logic; threshold 1.3–1.5 V (enable), 1.1–1.3 V (disable) with 0.22 V hysteresis for noise immunity. |
| 4 (VBST) | Bootstrap supply for high-side gate driver | Connected to SW via external capacitor; internal PMOS switch charges it during low-side conduction phase. |
| 5 (NC) | No-connect | Floating internally; must be left unconnected or tied to GND per layout guidelines. |
| 6–9, 15–17, 24 (SW) | Power switch node | Eight parallel SW terminals reduce trace inductance and power loss; connect directly to output inductor. |
| 10–14, 22 (PGND) | Power ground return | Multiple low-inductance PGND pins minimize ground bounce and improve EMI performance in high-dI/dt switching. |
| 19 (VDD) | Bias supply input | 4.5–25 V input powering internal controller circuitry and VREG LDO; separate from VIN power path. |
| 20 (VREG) | 5-V LDO output | Supplies internal analog/digital blocks and gate drivers; 200 mA max output with 365 mV dropout at 30 mA. |
| 23 (FB) | VOUT feedback input | Connects to resistor divider from VO to PGND; 600 mV reference enables precise output voltage programming. |
| 25 (TRIP) | Overcurrent limit threshold | Sources 10 µA (25°C) to external resistor; sets valley OCL threshold (e.g., 15 A with 49 kΩ). |
| 26 (ALERT) | PMBus alert output | Open-drain signal indicating fault conditions (OVP, UVP, thermal shutdown) per PMBus ALERT# protocol. |
| 27 (SDA) | PMBus bidirectional data line | I²C-compatible data I/O with 0.4 V low-level output (5.5 V pull-up); supports standard/fast-mode speeds. |
| 28 (SCL) | PMBus clock input | Accepts 0.8 V low / 2.1 V high logic; hysteresis 240 mV ensures robust clock edge detection. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP3™ control mode | Eliminates need for external compensation network while delivering <10 µs load transient response for processor core rails. |
| Integrated MOSFETs | 9.9-mΩ high-side + 4.3-mΩ low-side RDS(on) enables >90% peak efficiency at 12 V input / 1.2 V output / 10 A load. |
| PMBus™ programmability | Enables runtime adjustment of VOUT margin (±12%), soft-start time (1–8 ms), switching frequency (200–1000 kHz), and fault reporting. |
| FCCM / Eco-Mode™ selection | MODE pin selects forced continuous conduction (tight ripple) or auto-skip (high light-load efficiency up to 85% at 100 mA). |
| Hiccup overcurrent protection | Valley-current limiting with configurable trip threshold (via TRIP pin resistor) followed by automatic restart after fault clearance. |
| Pre-biased startup capability | Allows safe start-up into pre-charged output capacitors without reverse current flow - critical for hot-swap and multi-rail sequencing. |
Applications
| Server Core Voltage Regulation | Telecom Point-of-Load Supply |
|---|---|
|
Use Scenario: Regulating 0.8–1.2 V core voltage for dual-socket Xeon or AMD EPYC processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary POL buck converter delivering up to 15 A with PMBus telemetry for dynamic voltage scaling and health monitoring. Use Value: D-CAP3™ control ensures sub-10 µs transient response to CPU burst loads; FCCM mode maintains <±1% output regulation during rapid current changes. |
Use Scenario: Powering 3.3 V or 5 V FPGA I/O banks and SerDes transceivers in 40G/100G line cards. IC Role / Device Role / Timing Role: High-efficiency, digitally controlled POL regulator with programmable soft-start and power-on delay for sequenced power-up. Use Value: Eight PMBus-selectable frequencies allow EMI spread-spectrum tuning; VREG LDO powers auxiliary logic without external regulators. |
| Industrial PLC CPU Power | Test & Measurement Instrumentation |
|
Use Scenario: Providing stable 1.8 V or 2.5 V supply to ARM Cortex-A series CPUs in ruggedized programmable logic controllers. IC Role / Device Role / Timing Role: Robust, thermally optimized buck converter operating across –40°C to 125°C ambient with hiccup OCP for field reliability. Use Value: 2.2°C/W θJCbot thermal resistance enables full 15 A output without heatsink in convection-cooled enclosures. |
Use Scenario: Generating precision 1.2 V analog supply for high-speed ADC/DAC reference circuits in portable spectrum analyzers. IC Role / Device Role / Timing Role: Low-noise, tightly regulated POL source with ±0.5% reference and all-ceramic capacitor support. Use Value: Supports ultra-low-ESR MLCCs only - eliminates electrolytic capacitors and reduces board area by >40% vs. traditional designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2964GQKT-Z | 40 V max VIN, 12 A output, no PMBus, analog-only programming (resistor-based VOUT/fSW), 30 mΩ/15 mΩ MOSFETs | Lacks digital telemetry and dynamic margining; suited for cost-sensitive industrial apps without bus control requirements | Choose MP2964GQKT-Z when PMBus is unnecessary and lower BOM count outweighs programmability needs. |
| ISL9122AIRZ-T7A | 5.5 V max VIN, 12 A output, I²C interface (not PMBus-compliant), 12 mΩ/7 mΩ MOSFETs, no VREG LDO | Requires external 5 V bias; limited to low-input applications (e.g., battery-powered test gear); no integrated VREG simplifies bias but adds component count | Choose ISL9122AIRZ-T7A for portable, low-VIN designs where footprint and efficiency at light load are prioritized over digital configurability. |
Compared with MP2964GQKT-Z and ISL9122AIRZ-T7A, the TPS549A20RVET uniquely combines 15-A capability, full PMBus 1.3 compliance, integrated VREG LDO, and D-CAP3™ adaptive control - making it optimal for high-density, digitally managed server and telecom POL systems requiring telemetry, margining, and fast transient response.
Availability
TPS549A20RVET is available at Aetrix Electronics and suitable for server, telecom point-of-load, and industrial PLC applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for TPS549A20RVET 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 solutions.
The TPS549A20RVET belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-current, digitally controllable point-of-load regulation in space-constrained computing and communications infrastructure.
FAQ
What is the maximum supported input voltage for the TPS549A20RVET?
The TPS549A20RVET supports a conversion input voltage range of 1.5 V to 20 V when using an external snubber network. Its VDD bias supply accepts 4.5 V to 25 V, enabling flexible system-level power architecture. Absolute maximum VIN is 25 V, and exceeding this risks permanent damage per the datasheet's absolute maximum ratings table.
Does the TPS549A20RVET require external compensation components?
No, the TPS549A20RVET uses D-CAP3™ control architecture with an internal ripple generation network, eliminating the need for external compensation components like type-II or type-III error amplifiers. This reduces BOM count and simplifies layout while maintaining stability with all-ceramic output capacitors.
How is overcurrent protection configured on the TPS549A20RVET?
Overcurrent protection on the TPS549A20RVET is configured via the TRIP pin (pin 25), which sources a 10 µA current (25°C) to an external resistor. The resulting voltage sets the valley-current limit threshold - for example, a 49 kΩ resistor yields a nominal 15-A OCL. The device responds with hiccup-mode shutdown upon fault detection.
Can the TPS549A20RVET operate with a pre-charged output capacitor?
Yes, the TPS549A20RVET supports pre-biased startup, allowing safe operation into an already charged output capacitor without reverse current flow. This feature is essential for hot-swap applications and multi-rail power sequencing where output voltage may be present before enable assertion.
What thermal performance can be expected from the TPS549A20RVET in a typical 12 V to 1.2 V, 10 A design?
In a typical 12 V to 1.2 V, 10 A design with 500 kHz switching frequency and proper PCB layout (2 oz copper, thermal pad soldered), the TPS549A20RVET achieves junction-to-board thermal resistance (θJB) of 18.1°C/W. Measured case temperature rise is ~35°C above ambient, enabling full 15-A operation without forced airflow in most industrial enclosures.
TPS549A20RVET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP3™, Eco-Mode™
- Package/Case:
- 28-VFQFN Exposed Pad
- 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):
- 1.5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 15A
- Frequency - Switching:
- Selectable
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-VQFN-CLIP (4.5x3.5)
TPS549A20RVET FAQ
1.How can I place an order for TPS549A20RVET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS549A20RVET 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 TPS549A20RVET reliable?
The price and inventory of TPS549A20RVET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS549A20RVET is usually 5 days.
3.What payment methods are accepted for TPS549A20RVET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS549A20RVET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS549A20RVET?
TPS549A20RVET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS549A20RVET 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 TPS549A20RVET?
For technical support, including TPS549A20RVET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS549A20RVET requirements.
6.How does Aetrix verify that TPS549A20RVET is sourced from the original manufacturer or authorized distributors?
All TPS549A20RVET 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 TPS549A20RVET meets industry standards.
7.What is the process for return or replacement of TPS549A20RVET?
All TPS549A20RVET units undergo pre-shipment inspection (PSI). If there is an issue with TPS549A20RVET, 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 TPS549A20RVET part is unused and in its original packaging.
Return procedure for TPS549A20RVET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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