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Texas Instruments TPS544B20RVFR
- Part No.:
- TPS544B20RVFR
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS544B20RVFR.pdf
- Description:
- IC REG BUCK ADJ 20A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,984
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Product details
Overview
TPS544B20 from Texas Instruments is a PMBus-enabled, 20-A synchronous buck converter with integrated NexFET™ power stage, supporting 4.5-V to 18-V input and 0.6-V to 5.5-V output. It delivers high power density in a 5 mm × 7 mm LQFN package, features lossless current sensing, differential remote sensing, and D-CAP2™ control mode-enabling fast transient response in server VRMs and high-density telecom power supplies.
For engineers reviewing the TPS544B20 datasheet, TPS544B20 pinout, TPS544B20 application, or TPS544B20 equivalent, key selection criteria include its 20-A continuous output rating, 500-kHz default switching frequency (programmable 250–1000 kHz), ±0.5% reference accuracy, PMBus programmability for fault thresholds and sequencing, and thermal shutdown at 135°C–155°C.
Technical Context
The TPS544B20 implements a dual-mode control architecture: selectable D-CAP™ or D-CAP2™ for adaptive on-time regulation, enabling zero-phase-margin compensation without external loop components. Its integrated 4.5-mΩ high-side and 2.0-mΩ low-side MOSFETs support high-efficiency operation up to 20 A with minimal external components.
It embeds a full PMBus 1.2 interface for real-time monitoring of output voltage (±2.0% accuracy), output current (±15% above 20 A), and external temperature (–40°C to +165°C), plus programmable protection including overcurrent (26 A default), overvoltage (700 mV FB threshold), and thermal fault latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 20 A continuous - supports high-current CPU/GPU core rails without external power stages |
| Input Voltage Range | 4.5 V to 18 V - compatible with 5 V, 12 V, and intermediate bus architectures |
| Output Voltage Range | 0.6 V to 5.5 V - covers DDR, ASIC, FPGA, and SoC core/supply rails |
| Reference Accuracy | ±0.5% at 600 mV - ensures tight regulation tolerance for sub-1 V digital loads |
| Switching Frequency | 250–1000 kHz (default 500 kHz) - balances efficiency, size, and transient response |
| Current Sensing | Lossless low-side MOSFET sensing - eliminates sense resistor losses and layout sensitivity |
| PMBus Compliance | PMBus 1.2 - enables full configuration, telemetry, and fault logging via standard interface |
| Thermal Shutdown | 135°C to 155°C with 20°C–30°C hysteresis - protects against sustained overload or airflow loss |
Pinout & Package
TPS544B20 is housed in a 40-pin LQFN (RVFR) package measuring 5.00 mm × 7.00 mm with 0.5-mm pitch and a single exposed thermal pad. The package supports high-power dissipation via bottom-side thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 21–25) | Power stage input | High-current input connection requiring multi-capacitor high-frequency bypass to GND |
| SW (Pins 8–12) | Switch node | Connects to inductor and bootstrap capacitor; grouped pins reduce parasitic inductance |
| PGOOD (Pin 36) | Open-drain status output | Asserts high when output is within ±5% of target; pulls low on UV/OV/OT/OC faults |
| FB (Pin 34) | Feedback input | Senses regulated 0.6 V reference; supports differential remote sensing via VOUTS+/VOUTS– |
| MODE (Pin 39) | Control mode select | Logic-level input: AGND = D-CAP™, BP3 = D-CAP2™ - determines transient response tuning |
| RT (Pin 40) | Frequency set | Resistor-to-AGND sets switching frequency (e.g., 38.3 kΩ = 500 kHz) |
| ADDR0/ADDR1 (Pins 3–2) | PMBus address bits | Resistor-programmable 6-bit slave address (bits 0–1 externally set) |
| AGNDSNS (Pin 13) | Analog ground Kelvin sense | Internal connection to thermal pad; provides precision current measurement reference point |
Key Features
| Feature | Design Value |
|---|---|
| Differential Remote Sensing | Compensates for IR drop across PCB traces using VOUTS+/VOUTS– inputs, improving load regulation to ±0.5% at point-of-load |
| Monotonic Start-Up into Pre-Biased Output | Prevents reverse current flow during hot-plug or rail sequencing, critical for multi-rail systems |
| Output Voltage Margin & Trim | ±60 mV FB adjustment range (480–660 mV) enables system-level validation and aging compensation |
| Integrated Power Stage | 4.5-mΩ/2.0-mΩ stacked NexFET™ MOSFETs eliminate discrete driver and gate-resistor design effort |
| External Temperature Monitoring | TSNS pin interfaces with 2N3904 transistor for board-level thermal telemetry, configurable via PMBus |
| Programmable Fault Responses | Per-fault configuration (OV/UV/OC/OT) for restart, latch-off, or retry - meets system safety and recovery requirements |
Applications
| Server VRM | Enterprise SSD Power |
|---|---|
Use Scenario: Core voltage regulation for dual-socket Xeon processors in 1U/2U rack servers with strict transient and efficiency requirements. IC Role / Device Role / Timing Role: Primary 20-A buck regulator delivering dynamically scaled VDDCORE with PMBus telemetry for power management firmware. Use Value: Enables <1% output deviation under 10-A/µs load steps while reporting real-time current and temperature to BMC via PMBus. |
Use Scenario: High-efficiency 1.2-V/1.8-V power for NVMe SSD controllers and NAND flash in enterprise storage arrays. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter replacing discrete solutions in space-constrained M.2/U.2 modules. Use Value: Delivers >92% peak efficiency at 15 A with integrated current sensing-reducing BOM count and thermal footprint vs. controller+external FET designs. |
| Ethernet Switch PoL | Optical Transport Line Card |
Use Scenario: Point-of-load conversion for 10/25/100-GbE switch ASICs requiring fast transient response and rail sequencing. IC Role / Device Role / Timing Role: Secondary buck regulator controlled via PMBus for dynamic voltage scaling and fault coordination with main system controller. Use Value: D-CAP2™ mode achieves <500-ns response to 5-A load steps, minimizing required output capacitance and PCB area. |
Use Scenario: Powering DSPs, transceivers, and analog front-ends in CFP2/CFP4 optical line cards operating in extended temperature environments. IC Role / Device Role / Timing Role: High-reliability, thermally monitored buck converter with latch-off fault handling for mission-critical infrastructure. Use Value: Thermal shutdown with 25°C hysteresis and external temperature sensing ensure safe operation up to +85°C ambient with forced airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544C20RVFR | 30-A rated output, identical pinout and feature set; higher RDS(on) (4.5/2.0 mΩ → 3.8/1.7 mΩ) optimized for higher current | Used where >20 A peak load or higher thermal margin is required; same PCB layout but requires larger input/output capacitors | Select TPS544C20RVFR only if sustained load exceeds 20 A or system derating targets require headroom beyond TPS544B20's SOA |
| ISL9122AIRZ-T7A | 12-A max output, 2.5-V to 5.5-V input, no PMBus; uses constant-on-time control and integrated inductor option | Targeted at portable/embedded applications with lower power and simpler interface needs-not suitable for server/telecom telemetry or high-current demands | Choose ISL9122AIRZ-T7A only for space-constrained, low-power, non-telemetry designs where PMBus and >12 A capability are unnecessary |
Compared with TPS544C20RVFR, the TPS544B20RVFR offers tighter thermal margins and lower conduction loss at ≤20 A loads; versus ISL9122AIRZ-T7A, it provides full PMBus telemetry, higher current, and broader input range-making it uniquely suited for programmable, high-density infrastructure power.
Availability
TPS544B20RVFR is available at Aetrix Electronics and suitable for server VRMs, enterprise SSD power supplies, and optical transport line cards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS544B20RVFR 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 TPS544x20 product line was designed specifically for high-current, digitally programmable point-of-load applications in datacenter, networking, and storage infrastructure-emphasizing PMBus telemetry, thermal robustness, and layout simplicity.
FAQ
What is the maximum continuous output current rating for the TPS544B20RVFR?
The TPS544B20RVFR is rated for 20 A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its safe operating area supports transient peaks beyond 20 A depending on duty cycle and airflow, as validated in TI's evaluation module testing.
Does the TPS544B20RVFR support differential remote voltage sensing?
Yes, the TPS544B20RVFR supports differential remote sensing via dedicated VOUTS+ (Pin 31) and VOUTS– (Pin 32) inputs. This enables precise regulation at the load by compensating for PCB trace resistance, improving load regulation accuracy to ±0.5% at point-of-load.
How is the switching frequency programmed on the TPS544B20RVFR?
The switching frequency of the TPS544B20RVFR is set using an external resistor connected from RT (Pin 40) to AGND. With a 38.3-kΩ resistor, the default frequency is 500 kHz; values from 10.0 kΩ to 205 kΩ program frequencies from 250 kHz to 1000 kHz per TI's RT resistor table.
Can the TPS544B20RVFR operate with a pre-biased output?
Yes, the TPS544B20RVFR features monotonic start-up into pre-biased outputs. Its control architecture prevents reverse current flow during startup, making it suitable for hot-swap and multi-rail sequencing applications common in servers and telecom equipment.
What protection features are configurable via PMBus on the TPS544B20RVFR?
The TPS544B20RVFR allows full PMBus-based configuration of overcurrent (IOC), overvoltage (VFB OV), undervoltage (VFB UV), overtemperature (OT), and power-good (PGOOD) thresholds, plus fault response modes (restart/latch-off), turn-on/off delays, and margining settings-all accessible via standard PMBus commands.
TPS544B20RVFR 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)
TPS544B20RVFR FAQ
1.How can I place an order for TPS544B20RVFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS544B20RVFR 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 TPS544B20RVFR reliable?
The price and inventory of TPS544B20RVFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS544B20RVFR is usually 5 days.
3.What payment methods are accepted for TPS544B20RVFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS544B20RVFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS544B20RVFR?
TPS544B20RVFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS544B20RVFR 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 TPS544B20RVFR?
For technical support, including TPS544B20RVFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS544B20RVFR requirements.
6.How does Aetrix verify that TPS544B20RVFR is sourced from the original manufacturer or authorized distributors?
All TPS544B20RVFR 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 TPS544B20RVFR meets industry standards.
7.What is the process for return or replacement of TPS544B20RVFR?
All TPS544B20RVFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS544B20RVFR, 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 TPS544B20RVFR part is unused and in its original packaging.
Return procedure for TPS544B20RVFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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