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Texas Instruments TPS546B24SRVFR
- Part No.:
- TPS546B24SRVFR
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS546B24SRVFR.pdf
- Description:
- IC REG BUCK PROG 20A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
TPS546B24SRVFR from Texas Instruments is a 20-A, 2.95-V to 18-V synchronous step-down DC/DC converter with PMBus® interface, extended write protection, and stackable architecture supporting up to 4× parallel operation for 80-A total output. It integrates 5.5-mΩ high-side and 1.8-mΩ low-side MOSFETs, delivers <1% output voltage error via differential remote sensing, and operates in a 7-mm × 5-mm, 40-pin QFN (RVF) package. It targets high-density server power rails feeding ASICs, FPGAs, and SoCs.
For engineers reviewing the TPS546B24SRVFR datasheet, TPS546B24SRVFR pinout, TPS546B24SRVFR application, or TPS546B24SRVFR equivalent, key selection criteria include its 20-A single-device current rating, 225 kHz–1.5 MHz programmable switching frequency, PMBus telemetry for VOUT/IOUT/die temperature, 0.25-V to 5.5-V digitally adjustable output, and verified 4-device current-sharing accuracy of ±10% at ≥10 A per unit.
Technical Context
The TPS546B24SRVFR employs fixed-frequency average current-mode control with input feedforward and selectable internal compensation, enabling stable regulation across wide output capacitance ranges without external loop components. Its dual-input architecture separates PVIN (power stage) and AVIN (controller), with dedicated 5-V (VDD5) and 1.5-V (BP1V5) internal LDOs powering gate drivers and digital logic respectively.
Back-channel communication (BCX_CLK/BCX_DAT) enables stacked devices to share a single PMBus address while maintaining independent configuration. Extended Write Protect uses manufacturer-specific commands and passkey authentication to restrict write access beyond standard PMBus Write Protect, enhancing firmware security against unauthorized reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 20 A continuous per device; supports 2×/3×/4× stacking for up to 80 A with active current sharing. |
| Input Voltage Range | 2.95 V to 18 V on both PVIN and AVIN rails; enables flexible split-rail supply design. |
| Output Voltage Range | 0.25 V to 5.5 V via PMBus VOUT_COMMAND; 0.5 V to 5.5 V via pin-strap; supports core and I/O rail generation. |
| Switching Frequency | 225 kHz to 1.5 MHz (12 options); selectable via MSEL1 pin strap or PMBus for EMI optimization. |
| Thermal Performance | RθJA = 25.3°C/W (JEDEC), RθJB = 8.5°C/W; 7-mm × 5-mm QFN package with exposed thermal pad ensures high-power density. |
| Accuracy & Sensing | Differential remote sensing achieves <1% VOUT error over –40°C to +150°C; integrated 24-bit ADCs for VOUT/IOUT/temperature telemetry. |
| PMBus Interface | 1-MHz clock support; full command set including AVS, margining, fault response configuration, and extended write protection with passkey. |
Pinout & Package
TPS546B24SRVFR is housed in a 7.0 mm × 5.0 mm, 40-pin LQFN-CLIP (RVF) package with an exposed thermal pad connected internally to PGND. The package supports high-current routing and efficient heat dissipation through bottom-side solder attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGD/RST_B | Open-drain power-good or reset output | Configurable via PMBus to signal valid output voltage or assert system reset; internal pullup optional. |
| 2–3 PMB_DATA / PMB_CLK | PMBus bidirectional data and clock | Standardized digital interface for configuration, telemetry, and fault monitoring at up to 1 MHz. |
| 7–8 BOOT / SW | Bootstrap gate drive and switch node | Drives high-side FET; SW pins (8–12) carry full output current and require low-inductance layout. |
| 13–20 PGND | Power ground return | Internally tied to thermal pad; must be solidly connected to PCB ground plane for thermal and EMI performance. |
| 21–25 PVIN | Main power stage input | Accepts 2.95–18 V; requires local high-frequency ceramic bypassing directly to PGND. |
| 26 AVIN | Controller supply input | Separate 2.95–18 V rail powers analog/digital controller; noise isolation from PVIN critical. |
| 28 VDD5 | 5-V internal regulator output | Powers gate driver stage; requires ≥4.7 µF X5R ceramic capacitor to PGND at thermal pad. |
| 33–34 VOSNS / GOSNS/FLWR | Differential remote sense inputs | Enable <1% output regulation accuracy at load; GOSNS pulled to BP1V5 configures multi-phase follower mode. |
| 35 VSHARE | Current-share bus | Enables active current balancing across stacked devices; floating in single-device operation. |
| 38–40 SYNC / BCX_CLK / BCX_DAT | Frequency sync and back-channel comms | SYNC configurable as IN/OUT; BCX signals coordinate timing and parameter sharing among stacked units. |
Key Features
| Feature | Design Value |
|---|---|
| Extended Write Protection with Passkey | Restricts PMBus write access using TI-specific commands and cryptographic passkey, preventing unauthorized firmware tampering. |
| Stackable Architecture (2×–4×) | Enables scalable 40–80 A solutions with single-address PMBus control and automatic current sharing within ±10% tolerance. |
| Dual Input Rails (PVIN/AVIN) | Isolates noisy power-stage switching from sensitive controller circuitry, improving noise immunity and stability. |
| Programmable Internal Compensation | Four selectable transconductance/resistor/capacitor settings eliminate external compensation components for faster design iteration. |
| Prebiased Output Startup | Supports safe startup into precharged output capacitors without reverse current flow or output overshoot. |
| Integrated High/Low-Side MOSFETs | 5.5-mΩ/1.8-mΩ RDS(on) pair minimizes conduction loss and eliminates external power stage component count. |
Applications
| Data Center Switches | Rack Server VRMs |
|---|---|
Use Scenario: High-current, dynamically scaled core voltage rails in top-of-rack switches requiring fast transient response and telemetry. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 0.8–1.2 V at up to 80 A with PMBus-configurable AVS and margining. Use Value: Enables real-time voltage scaling and health monitoring via standardized interface, reducing system-level validation effort. |
Use Scenario: Multi-phase CPU/GPU VRMs in 1U/2U servers where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Stackable buck controller providing synchronized switching and precise current sharing across phases. Use Value: Achieves 20-A per phase in 35 mm² footprint with <1% output error, simplifying thermal management and layout. |
| Active Antenna Systems | FPGA/ASIC Core Power |
Use Scenario: Remote radio units (RRUs) in 5G infrastructure requiring robust, digitally monitored power under wide temperature range. IC Role / Device Role / Timing Role: Isolated, thermally resilient POL converter supplying FPGA transceivers and RF front-end bias rails. Use Value: Differential sensing maintains <1% regulation from –40°C to +150°C junction, ensuring signal integrity in outdoor deployments. |
Use Scenario: Low-noise, high-accuracy core voltage for high-speed FPGAs and ASICs with dynamic DVFS requirements. IC Role / Device Role / Timing Role: Digitally programmable buck converter supporting sub-100 mV output steps and 1 mV/µs slew rate control. Use Value: Enables precise voltage margining and AVS for process/voltage/temp corner testing without hardware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546B24A | Lacks extended write protection, passkey, and manufacturer-specific PMBus commands; identical pinout and electrical specs otherwise. | Suitable for non-security-critical systems where basic PMBus functionality suffices. | Select TPS546B24A only if extended security features are unnecessary and cost sensitivity outweighs firmware protection needs. |
| TPS546D24S | Higher 40-A rating per device; different current-sense architecture; shares same RVF package but distinct pin mapping for sensing and sharing. | Targeted at ultra-high-current single-device applications (>20 A) where stacking is undesirable. | Choose TPS546D24S when >20 A per phase is required and board area allows larger thermal solution; not drop-in compatible. |
Compared with TPS546B24A, TPS546B24SRVFR adds firmware-level security without sacrificing performance; compared with TPS546D24S, it trades per-device current capacity for finer-grained stackability and enhanced telemetry resolution in compact form factor.
Availability
TPS546B24SRVFR is available at Aetrix Electronics and suitable for data center switches, rack servers, and active antenna systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for high-reliability deployments.
Supply support for TPS546B24SRVFR 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 decades of DC/DC converter innovation.
The TPS546B24S product line delivers high-current, digitally controlled buck converters for demanding server, telecom, and test equipment applications where security, scalability, and precision regulation are critical.
FAQ
What is the maximum output current capability of the TPS546B24SRVFR in standalone and stacked configurations?
The TPS546B24SRVFR delivers 20 A continuously in standalone operation. When stacked, two, three, or four units can be interconnected to provide up to 80 A on a single output rail with active current sharing. Current-sharing accuracy is specified as ±10% between devices at ≥10 A per unit, verified across temperature and load conditions per the datasheet.
Does the TPS546B24SRVFR support differential remote sensing, and what is its accuracy impact?
Yes, the TPS546B24SRVFR supports differential remote sensing via VOSNS and GOSNS/FLWR pins. This feature reduces output voltage error caused by PCB trace resistance, achieving <1% total VOUT error over the full operating temperature range of –40°C to +150°C junction temperature, as confirmed in the Electrical Characteristics table.
How does the Extended Write Protection feature of the TPS546B24SRVFR differ from standard PMBus Write Protect?
The TPS546B24SRVFR implements Extended Write Protection using TI-manufacturer-specific PMBus commands and a configurable passkey, providing granular write restriction beyond the binary enable/disable of standard PMBus Write Protect. This prevents unauthorized modification of critical parameters such as VOUT_COMMAND, switching frequency, and fault thresholds without authenticated access.
What package type and thermal characteristics apply to the TPS546B24SRVFR?
The TPS546B24SRVFR uses a 7.0 mm × 5.0 mm, 40-pin LQFN-CLIP (RVF) package with an exposed thermal pad connected to PGND. Its thermal metrics include RθJA = 25.3°C/W (JEDEC standard) and RθJB = 8.5°C/W, enabling high-power density operation when properly mounted on a 2-oz copper PCB with adequate thermal vias under the pad.
Can the TPS546B24SRVFR be used without PMBus communication, and how is output voltage set in that case?
Yes, the TPS546B24SRVFR supports pin-strapped configuration for key parameters. Output voltage is set via the VSEL pin using a resistor divider to BP1V5, enabling fixed outputs from 0.5 V to 5.5 V without PMBus. Soft-start time, switching frequency, and overcurrent limits are similarly configured using MSEL1, MSEL2, and ADRSEL pins - allowing fully functional "program-free" power-up.
TPS546B24SRVFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-PowerLFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.95V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.25V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 20A
- Frequency - Switching:
- 225kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-LQFN-CLIP (7x5)
TPS546B24SRVFR FAQ
1.How can I place an order for TPS546B24SRVFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS546B24SRVFR 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 TPS546B24SRVFR reliable?
The price and inventory of TPS546B24SRVFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS546B24SRVFR is usually 5 days.
3.What payment methods are accepted for TPS546B24SRVFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS546B24SRVFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS546B24SRVFR?
TPS546B24SRVFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS546B24SRVFR 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 TPS546B24SRVFR?
For technical support, including TPS546B24SRVFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS546B24SRVFR requirements.
6.How does Aetrix verify that TPS546B24SRVFR is sourced from the original manufacturer or authorized distributors?
All TPS546B24SRVFR 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 TPS546B24SRVFR meets industry standards.
7.What is the process for return or replacement of TPS546B24SRVFR?
All TPS546B24SRVFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS546B24SRVFR, 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 TPS546B24SRVFR part is unused and in its original packaging.
Return procedure for TPS546B24SRVFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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