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Texas Instruments TPS546C23RVFT
- Part No.:
- TPS546C23RVFT
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS546C23RVFT.pdf
- Description:
- IC REG BUCK ADJ 35A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:326
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Product details
Overview
TPS546C23RVFT from Texas Instruments is a PMBus 1.3–compliant, 35-A synchronous buck converter with integrated NexFET™ power stage, supporting 4.5 V to 18 V input and 0.35 V to 5.5 V output. It delivers high-density power in a 7 mm × 5 mm LQFN-40 package and enables 2-device stacking for up to 70 A with current sharing-used in server VR13/VR14 CPU core power delivery.
For engineers reviewing the TPS546C23RVFT datasheet, TPS546C23RVFT pinout, TPS546C23RVFT application, or TPS546C23RVFT equivalent, this page provides verified electrical specs (e.g., 0.5% VREF accuracy at ≥600 mV), telemetry-enabled monitoring (VOUT, IOUT, die temperature), stackable PMBus configuration, and thermal-aware design guidance for enterprise SSD and telecom infrastructure.
Technical Context
The TPS546C23RVFT implements voltage-mode control with input feed-forward and differential remote sensing, enabling precise regulation under dynamic load transients. Its integrated 3.2-mΩ high-side and 1.4-mΩ low-side MOSFETs support up to 500 kHz switching (RRT = 40.2 kΩ) and monotonic start-up into pre-biased outputs.
PMBus 1.3 compliance enables full telemetry-including real-time output voltage/current reporting, internal die temperature monitoring, and programmable fault responses (OCP, OV/UV, OT). Dual-phase stacking uses ISHARE/VSHARE signaling and SYNC-IN/SYNC-OUT for interleaved operation with <515 ns timing skew between master and slave devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports 5 V, 12 V, and 15 V intermediate bus architectures without external regulators. |
| Output Current | 35 A continuous per device - sufficient for single-core CPU or ASIC power rail in servers and switches. |
| Output Voltage Range | 0.35 V to 5.5 V - covers VR13/VR14 core, SoC I/O, and memory supply requirements. |
| Voltage Reference Accuracy | ±0.5% at ≥600 mV - ensures tight regulation for sub-1 V digital rails critical in advanced process nodes. |
| Switching Frequency | 200 kHz to 1 MHz - adjustable via RT resistor or external SYNC clock for EMI optimization and layout flexibility. |
| Thermal Shutdown Threshold | 135°C to 160°C (typ. 145°C) - protects against sustained overload while allowing transient thermal headroom. |
| Current Sensing Method | Lossless low-side MOSFET sensing - eliminates sense resistor power loss and improves efficiency at high currents. |
| PMBus Address Options | 64 unique addresses via ADDR0/ADDR1 strapping - enables scalable multi-rail management in dense systems. |
Pinout & Package
The TPS546C23RVFT is housed in a 40-pin LQFN (RVFT) package measuring 7.00 mm × 5.00 mm with an exposed thermal pad connected internally to PGND. Thermal pad solder coverage is mandatory for reliable thermal performance (RθJB = 3.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT | Frequency-setting input | Connects to AGND via resistor to set switching frequency from 200 kHz to 1 MHz; floating not allowed. |
| ADDR0 / ADDR1 | PMBus address configuration | Resistor-strapped inputs selecting one of 64 PMBus addresses; essential for multi-device bus arbitration. |
| ISHARE / VSHARE | 2-phase current/voltage sharing interface | Enables precise load balancing between stacked converters; left floating in single-device mode. |
| SYNC | Frequency synchronization I/O | Configures as SYNC-IN (slave) or SYNC-OUT (master); supports 160–1200 kHz external clock for interleaving. |
| FB / COMP / DIFFO | Feedback loop interface | FB is error amplifier inverting input; COMP is compensation node; DIFFO provides remote-sense output for telemetry. |
| PGND / DRGND / AGND | Ground returns | PGND handles high-current power-stage return; DRGND serves driver stage; AGND is analog reference ground-separate routing required. |
| BOOT / SW / BP3 / BP6 | Power stage biasing | BOOT supplies high-side gate drive; SW is switched node; BP3 (3.3 V) and BP6 (6.5 V) are internal regulators for controller/driver stages. |
| PMB_DATA / PMB_CLK / SMB_ALERT | PMBus interface | Standard two-wire SMBus-compatible interface for configuration, telemetry readback, and fault alerting. |
Key Features
| Feature | Design Value |
|---|---|
| Stackable 2-phase architecture | Enables 70-A output with matched current sharing (±15% accuracy ≥20 A per device), reducing per-rail component count. |
| Integrated NexFET™ power stage | 3.2-mΩ/1.4-mΩ RDS(on) FETs eliminate external MOSFETs and drivers, shrinking solution size by >30% vs discrete designs. |
| Differential remote sensing | Compensates for PCB IR drop using RSP/RSN inputs, maintaining ±0.5% regulation accuracy at point-of-load. |
| Adaptive Voltage Scaling (AVS) | Supports dynamic VOUT adjustment via VOUT_COMMAND register (2−9 V resolution) for power-performance optimization. |
| Telemetry-grade monitoring | Reports output voltage (±2%), output current (±15% ≥20 A), and die temperature (±5°C) over PMBus for system health analytics. |
| Programmable fault response | OCP, OV, UV, OT thresholds and responses (restart/latch-off/ignore) configurable per system safety requirements. |
Applications
| Server CPU Core Power | Enterprise SSD Power Rail |
|---|---|
Use Scenario: Delivering tightly regulated 0.8 V–1.2 V at up to 35 A to high-performance x86 or ARM-based server CPUs. IC Role / Device Role / Timing Role: Primary VR13/VR14 buck converter providing dynamic voltage scaling and telemetry feedback to IMVP/PMBus host controller. Use Value: Enables real-time AVS and load-line calibration via PMBus, improving energy efficiency by up to 12% under variable workloads. |
Use Scenario: Supplying stable 3.3 V or 1.8 V to NAND flash controllers and PCIe Gen4/Gen5 interface logic in NVMe SSDs. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC regulator with monotonic start-up into pre-biased outputs during hot-plug events. Use Value: Lossless current sensing and differential remote sensing ensure <±1% output regulation across wide temperature and load ranges. |
| Ethernet Switch ASIC Supply | Optical Transport Line Card |
Use Scenario: Powering multi-core network processors and SerDes blocks in 10/25/100 GbE switches requiring fast transient response. IC Role / Device Role / Timing Role: Synchronous buck converter with voltage-mode control and input feed-forward for <1 µs load-step response. Use Value: 500 kHz switching and optimized gate drivers reduce output capacitance needs by 40%, lowering BOM cost and board area. |
Use Scenario: Generating isolated 5 V and 3.3 V rails for DSPs, DACs, and laser diode drivers in coherent optical modules. IC Role / Device Role / Timing Role: PMBus-configurable converter supporting margining, sequencing, and fault logging for field-replaceable units. Use Value: 64 PMBus addresses and programmable soft-start/soft-stop enable coordinated power-up/down across multi-rail line cards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current PMBus buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546D24RVFT | Higher 40-A rating, 2.9-mΩ/1.2-mΩ FETs, supports 3.3-V AVIN min; no BP3 regulator. | Better suited for 3.3-V input bus systems; lacks 3.3-V auxiliary rail for analog circuitry. | Select when input voltage starts at 3.3 V or higher and auxiliary 3.3-V supply is unnecessary. |
| ISL9123IRAJZ-T7A | 30-A peak, 2.5-V to 5.5-V input, no PMBus telemetry; uses external MOSFETs. | Targeted at space-constrained portable applications-not stackable or telemetry-enabled. | Choose only for cost-sensitive, non-telemetry, low-input-voltage designs where board area is primary constraint. |
Compared with TPS546C23RVFT, the TPS546D24RVFT offers higher current and lower RDS(on) but removes the BP3 regulator needed for analog subsystems; the ISL9123IRAJZ-T7A sacrifices telemetry, stacking, and integration for minimal footprint-making it unsuitable for server or telecom infrastructure where monitoring and scalability are mandatory.
Availability
TPS546C23RVFT is available at Aetrix Electronics and suitable for server motherboard development, enterprise SSD power design, and optical transport equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS546C23RVFT 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 datacenter, industrial, and communications markets.
The TPS546C23RVFT belongs to TI's high-current, PMBus-enabled DC/DC converter family designed specifically for VR13/VR14-compliant CPU and ASIC core power in servers, switches, and storage systems.
FAQ
What is the maximum output current capability of the TPS546C23RVFT?
The TPS546C23RVFT delivers 35 A continuous output current per device. When two TPS546C23RVFT units are stacked in parallel with proper ISHARE/VSHARE interconnection and PMBus configuration, the combined output reaches 70 A with ±15% current-sharing accuracy above 20 A per phase-enabling high-power CPU and ASIC supply rails without external current-sharing circuitry.
Does the TPS546C23RVFT support adaptive voltage scaling (AVS)?
Yes, the TPS546C23RVFT supports AVS through its PMBus VOUT_COMMAND register, which allows dynamic adjustment of output voltage in 2−9 V steps across 0.35 V to 5.5 V. This enables real-time voltage/frequency scaling for power-performance optimization in CPUs and FPGAs, with telemetry feedback confirming actual VOUT and load conditions.
How is thermal management handled on the TPS546C23RVFT?
The TPS546C23RVFT integrates die temperature sensing with ±5°C accuracy and programmable overtemperature warning (100°C–140°C) and fault (120°C–165°C) thresholds. Its 7 mm × 5 mm LQFN package features an exposed thermal pad tied to PGND, achieving RθJB = 3.8°C/W. Thermal shutdown activates at 135°C–160°C with 25°C hysteresis to prevent cycling.
Can the TPS546C23RVFT operate without a PMBus host controller?
Yes-the TPS546C23RVFT operates autonomously using pin-strapped defaults: switching frequency set by RT resistor, output voltage defined by FB resistor divider, and protection thresholds at factory defaults. PMBus is optional for telemetry, configuration, and AVS; all critical functions remain active without host communication.
What is the purpose of the BP3 and BP6 pins on the TPS546C23RVFT?
BP3 provides a regulated 3.3-V output (3.0–3.4 V) powering the controller circuitry and requiring ≥2.2 µF bypass to AGND; BP6 delivers 6.5-V (5.85–6.95 V) for the high-side gate driver stage and requires ≥2.2 µF + 100-nF bypass to PGND. Neither pin is intended to power external loads-BP3 powers internal analog blocks, BP6 drives the power stage.
TPS546C23RVFT 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.35V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 35A
- 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)
TPS546C23RVFT FAQ
1.How can I place an order for TPS546C23RVFT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS546C23RVFT 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 TPS546C23RVFT reliable?
The price and inventory of TPS546C23RVFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS546C23RVFT is usually 5 days.
3.What payment methods are accepted for TPS546C23RVFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS546C23RVFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS546C23RVFT?
TPS546C23RVFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS546C23RVFT 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 TPS546C23RVFT?
For technical support, including TPS546C23RVFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS546C23RVFT requirements.
6.How does Aetrix verify that TPS546C23RVFT is sourced from the original manufacturer or authorized distributors?
All TPS546C23RVFT 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 TPS546C23RVFT meets industry standards.
7.What is the process for return or replacement of TPS546C23RVFT?
All TPS546C23RVFT units undergo pre-shipment inspection (PSI). If there is an issue with TPS546C23RVFT, 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 TPS546C23RVFT part is unused and in its original packaging.
Return procedure for TPS546C23RVFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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