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Texas Instruments TPS546C20ARVFR
- Part No.:
- TPS546C20ARVFR
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS546C20ARVFR.pdf
- Description:
- IC REG BUCK ADJ 35A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,500
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Product details
Overview
TPS546C20ARVFR 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, features lossless current sensing, differential remote sensing, and real-time telemetry for voltage, current, and die temperature-used in server VRMs and enterprise SSD power rails.
For engineers reviewing the TPS546C20ARVFR datasheet, TPS546C20ARVFR pinout, TPS546C20ARVFR application, or TPS546C20ARVFR equivalent, key selection criteria include its stackable 2-phase capability (up to 70 A), ±0.5% reference accuracy at ≥600 mV, programmable soft-start/soft-stop via pin-strapping or PMBus, and thermal shutdown with 135°C trip point.
Technical Context
The TPS546C20ARVFR implements voltage-mode control with input feed-forward and supports both standalone and master/slave 2-phase operation using ISHARE/VSHARE signaling. Its integrated 3.2-mΩ high-side and 1.4-mΩ low-side MOSFETs enable high-efficiency operation up to 1 MHz switching frequency, adjustable via RT resistor or external SYNC clock.
Differential remote sensing (RSP/RSN → DIFFO) enables precise load-point regulation, while PMBus 1.3 interface provides full telemetry-including real-time output current (±15% accuracy above 20 A) and internal die temperature (±5°C)-and configurable fault responses (restart, latch-off, ignore) for OCP, OV, UV, OT, and PG faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide-input industrial and server supplies without pre-regulation |
| Output Current | 35 A continuous - sufficient for single-core CPU/GPU VRM or high-end FPGA rail |
| Output Voltage Range | 0.35 V to 5.5 V - covers sub-1-V core supplies and 3.3/5-V I/O rails |
| Reference Accuracy | ±0.5% at ≥600 mV - ensures tight regulation for sensitive digital loads |
| Switching Frequency | 200 kHz to 1 MHz - enables optimization of size vs. efficiency; 450–550 kHz typical at RRT = 40.2 kΩ |
| Thermal Shutdown | 135°C to 160°C (typ. 145°C) - protects against sustained overload or airflow failure |
| Current Sharing Accuracy | ±15% between two stacked devices at ≥20 A per unit - enables predictable load balancing in 70-A configurations |
| PMBus Compliance | PMBus 1.3 - supports standard commands for telemetry, margining, AVS, and fault logging in system management firmware |
Pinout & Package
TPS546C20ARVFR uses a 40-pin LQFN (RVF) package with 7.0 mm × 5.0 mm body and exposed thermal pad connected internally to PGND. Thermal pad solder coverage is mandatory for thermal performance and reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT | Frequency setting input | Resistor-to-AGND sets switching frequency; floating not allowed |
| VSEL | Default output voltage select | Resistor-to-AGND configures boot-up VOUT; overrides PMBus VOUT_COMMAND on power-up |
| SS | Soft-start timing control | Resistor-to-AGND programs default TON_RISE (0–100 ms); critical for monotonic start into pre-biased loads |
| PMB_DATA / PMB_CLK | PMBus bidirectional interface | Supports SMBus 2.0–compatible communication; 10–400 kHz operation; open-drain with internal pullups |
| ISHARE / VSHARE | 2-phase current/voltage sharing bus | Enables automatic load balancing when two TPS546C20ARVFR units are stacked; unused in standalone mode |
| DIFFO / RSP / RSN | Differential remote sense amplifier | RSP/RSN connect to load; DIFFO feeds error amp for precise load-point regulation and telemetry reporting |
| RESET/PGD | Power-good indicator or reset input | Configurable via MFR_SPECIFIC_21 register; open-drain PG output (pulled low on fault) or active-low reset input |
| BOOT / SW / PGND / PVIN / AVIN | Power stage interface | BOOT-SW capacitor enables high-side drive; SW pins carry full 35-A switched current; PGND/PVIN/AVIN require low-impedance local bypassing |
Key Features
| Feature | Design Value |
|---|---|
| Stackable 2-phase architecture | Two TPS546C20ARVFR units deliver up to 70 A with automatic current sharing and interleaved switching-reducing input/output ripple and thermal stress |
| Integrated NexFET™ power stage | 3.2-mΩ high-side + 1.4-mΩ low-side MOSFETs minimize conduction loss and eliminate external driver design complexity |
| Lossless low-side current sensing | Eliminates sense resistor power loss and board area; enables accurate real-time current telemetry without efficiency penalty |
| Differential remote sensing | Compensates for PCB IR drop by measuring VOUT directly at the load, ensuring regulation accuracy at point-of-load |
| Adaptive Voltage Scaling (AVS) | Programmable VOUT_COMMAND via PMBus allows dynamic core voltage adjustment during processor DVFS transitions |
| Monotonic start-up into pre-biased output | Prevents reverse current flow when powering up into an already energized rail-critical for hot-swap and multi-rail systems |
Applications
| Server CPU Core Power | Enterprise SSD Power Management |
|---|---|
Use Scenario: Delivering tightly regulated 0.8–1.2 V at up to 35 A to high-performance x86 or ARM CPU cores in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary VRM controller with PMBus telemetry feeding BMC for thermal/power capping and predictive maintenance. Use Value: ±0.5% reference accuracy and differential remote sensing ensure stable core voltage under dynamic load transients up to 100 A/µs. |
Use Scenario: Providing 1.2 V, 1.8 V, and 3.3 V rails to NAND flash controllers, DRAM buffers, and PCIe PHYs in NVMe U.2/U.3 SSDs. IC Role / Device Role / Timing Role: High-density, thermally optimized DC/DC converter enabling compact 2.5-inch form factor with minimal heatsink requirements. Use Value: 7-mm × 5-mm LQFN package and integrated FETs reduce solution footprint by >40% versus discrete controller+driver+FET designs. |
| Ethernet Switch ASIC Supply | Test & Instrumentation Power Rails |
Use Scenario: Generating 0.95 V @ 30 A for 100G/400G Ethernet switch ASICs with strict transient response and telemetry requirements. IC Role / Device Role / Timing Role: Master-phase controller in 2× stacked configuration, synchronized via SYNC pin to suppress input ripple and EMI. Use Value: 200–1000 kHz programmable frequency allows EMI tuning; ISHARE-based current balance maintains ≤±15% phase mismatch under all load conditions. |
Use Scenario: Programmable, telemetry-enabled power supply for automated test equipment (ATE) requiring margining, fault logging, and remote calibration. IC Role / Device Role / Timing Role: Digitally controlled DC/DC source with PMBus VOUT_MARGIN_HIGH/LOW and real-time MIOUT reporting for closed-loop test sequencing. Use Value: 350–1650 mV AVS reference range and ±2% output voltage measurement accuracy support production-level parametric testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current, PMBus-enabled buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-0000-P | 40-A peak rating, 4.5–16-V input, no integrated telemetry; requires external ADC for current/temp monitoring | Lacks PMBus interface and built-in telemetry-suitable only where system-level monitoring is handled externally | Choose MP8770GQ-0000-P only if cost sensitivity outweighs need for embedded telemetry and AVS functionality. |
| ISL91302BHRZ-T7A | 20-A dual-phase controller (10 A per phase), 2.5–5.5-V input, supports I²C but not PMBus 1.3; no current sharing bus | Targeted at portable/battery-powered applications-not rated for 12–18-V server inputs or 35-A single-phase loads | Select ISL91302BHRZ-T7A only for low-input-voltage, space-constrained applications where 35-A capability is unnecessary. |
Compared with MP8770GQ-0000-P and ISL91302BHRZ-T7A, the TPS546C20ARVFR uniquely combines 35-A single-phase output, full PMBus 1.3 telemetry, and hardware-supported 2-phase stacking-making it the only option for compact, self-monitoring 70-A server VRMs requiring no external sensing components.
Availability
TPS546C20ARVFR is available at Aetrix Electronics and suitable for server motherboard development, enterprise SSD production, and high-speed networking equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS546C20ARVFR 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 and digital power control.
The TPS546C20ARVFR belongs to TI's high-current, digitally enhanced buck converter product line-designed specifically for next-generation server, storage, and networking infrastructure demanding precision regulation, telemetry, and scalable power delivery.
FAQ
What is the maximum output current capability of the TPS546C20ARVFR?
The TPS546C20ARVFR delivers 35 A continuously in standalone operation. When two units are stacked in master/slave 2-phase configuration using ISHARE and VSHARE signals, total output reaches 70 A with automatic current sharing and interleaved switching to reduce ripple and thermal stress. The device's thermal design-supported by RθJC(bot) = 0.7°C/W and exposed thermal pad-enables this rating in standard 2-layer PCB layouts with adequate copper area.
Does the TPS546C20ARVFR support remote voltage sensing?
Yes, the TPS546C20ARVFR supports true differential remote sensing via dedicated RSP and RSN pins, which feed the internal DIFFO amplifier. This enables precise regulation at the load point by compensating for PCB trace resistance, critical for maintaining ±0.5% accuracy under high-current dynamic loads. In 2-phase stacks, only the master device uses RSP/RSN; the slave's DIFFO is disabled.
How is output voltage programmed on the TPS546C20ARVFR?
Output voltage on the TPS546C20ARVFR is programmable via three methods: (1) Pin-strapping VSEL to AGND sets default boot-up voltage; (2) PMBus VOUT_COMMAND register adjusts voltage dynamically during operation (0.35–5.5 V in 2−9 V steps); (3) Margining commands (VOUT_MARGIN_HIGH/LOW) support production testing. All methods use the same internal DAC and feedback loop scaling.
What thermal protection features does the TPS546C20ARVFR include?
The TPS546C20ARVFR integrates multiple thermal protections: junction thermal shutdown triggers at 135–160°C (typ. 145°C) with 25°C hysteresis; programmable overtemperature warning (OT_WARN_LIMIT, default 120°C) and fault (OT_FAULT_LIMIT, default 145°C) thresholds; and real-time die temperature telemetry via PMBus READ_TEMPERATURE_1 command with ±5°C accuracy across –40°C to 165°C.
Can the TPS546C20ARVFR operate without a PMBus host controller?
Yes, the TPS546C20ARVFR operates fully autonomously without PMBus communication. Default settings-determined by VSEL, SS, RT, and CNTL pin states-govern output voltage, soft-start, frequency, and fault responses. PMBus is optional for telemetry, dynamic reconfiguration, and advanced features like AVS and margining; the device powers up and regulates correctly even with PMB_DATA/PMB_CLK unconnected.
TPS546C20ARVFR 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)
TPS546C20ARVFR FAQ
1.How can I place an order for TPS546C20ARVFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS546C20ARVFR 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 TPS546C20ARVFR reliable?
The price and inventory of TPS546C20ARVFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS546C20ARVFR is usually 5 days.
3.What payment methods are accepted for TPS546C20ARVFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS546C20ARVFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS546C20ARVFR?
TPS546C20ARVFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS546C20ARVFR 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 TPS546C20ARVFR?
For technical support, including TPS546C20ARVFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS546C20ARVFR requirements.
6.How does Aetrix verify that TPS546C20ARVFR is sourced from the original manufacturer or authorized distributors?
All TPS546C20ARVFR 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 TPS546C20ARVFR meets industry standards.
7.What is the process for return or replacement of TPS546C20ARVFR?
All TPS546C20ARVFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS546C20ARVFR, 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 TPS546C20ARVFR part is unused and in its original packaging.
Return procedure for TPS546C20ARVFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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