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Texas Instruments TPS543B20RVFR
- Part No.:
- TPS543B20RVFR
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS543B20RVFR.pdf
- Description:
- IC REG BUCK ADJ 25A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:919
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Product details
Overview
TPS543B20 from Texas Instruments is a 25-A synchronous step-down DC/DC converter with integrated 4.1 mΩ high-side and 1.9 mΩ low-side NexFET™ power MOSFETs, adaptive internal compensation, and stackable architecture for up to 50-A POL applications. It operates from 4 V to 19 V input, delivers 0.6 V to 5.5 V output, and supports pin-strapped switching frequency from 300 kHz to 2 MHz (standalone) or 300 kHz to 1 MHz (stacked), targeting high-density server and FPGA core rails.
For engineers reviewing the TPS543B20 datasheet, TPS543B20 pinout, TPS543B20 application, or TPS543B20 equivalent, key selection considerations include its lossless current sensing, differential remote sensing capability, safe pre-biased start-up, hiccup-mode overcurrent protection, and thermal performance in the 5-mm × 7-mm LQFN-CLIP (RVFR) package with single thermal pad.
Technical Context
The TPS543B20 implements emulated peak-current-mode control with an internal ramp generator that eliminates external compensation across 300 kHz–2 MHz, enabling stable operation with low-ESR MLCC output capacitors. Its ACM controller integrates direct ramp tracking and internal integrator for robust transient response and noise immunity.
It supports dual-phase stacking via ISHARE/VSHARE pins for precise current and voltage sharing, with synchronization capability (SYNC pin configurable as input or output) and programmable API/body braking to reduce undershoot/overshoot. The device includes differential remote sense amplifier (RSP/RSN), 0.5% accurate reference (VSEL-strapped), and dedicated PGD open-drain power-good indicator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 25 A continuous per device; supports 2× stacking for 50-A total with matched current/voltage sharing. |
| Input Voltage Range | 4 V to 19 V - enables direct use with 5 V, 12 V, and 18 V intermediate bus systems without pre-regulation. |
| Output Voltage Range | 0.6 V to 5.5 V - covers ASIC/FPGA core (0.6–1.2 V), I/O (1.8–3.3 V), and auxiliary rails (5 V). |
| Switching Frequency | 300 kHz–2 MHz (standalone); 300 kHz–1 MHz (stacked) - balances EMI, efficiency, and inductor size. |
| Power Stage RDS(on) | 4.1 mΩ HS / 1.9 mΩ LS - enables >90% efficiency at 12 VIN/1 VOUT/20 A with minimal conduction loss. |
| Remote Sensing | Differential RSP/RSN inputs - compensates for PCB IR drop to maintain ±0.5% output accuracy at load point. |
| Thermal Resistance | RθJC(bot) = 1.2 °C/W - enables high-power density operation with direct thermal pad soldering to PCB ground plane. |
Pinout & Package
TPS543B20 is housed in a 40-pin LQFN-CLIP (RVFR) package measuring 5.0 mm × 7.0 mm with 0.5-mm pitch and a single exposed thermal pad internally connected to PGND. The package supports high-current routing and efficient heat dissipation via bottom-side thermal interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RSP / RSN | Differential remote sense inputs | Enable precision regulation at load by rejecting PCB trace resistance; required for <±0.5% output accuracy. |
| SW | Power switch node | Connects to output inductor; carries full switched current; requires low-inductance layout and snubber for ringing control. |
| BOOT | High-side gate driver bootstrap supply | Requires 100-nF capacitor to SW; series BOOT resistor (1–10 Ω) reduces high-side turn-on dv/dt and SW ringing. |
| VSEL | Reference voltage programming input | Resistor-to-AGND sets initial VREF from 0.6 V to 1.1 V with 0.5% tolerance - defines output setpoint at startup. |
| ILIM | Current limit threshold setting | Resistor-to-AGND configures hiccup-mode OCP threshold (e.g., 48.7 kΩ → 20 A); enables lossless sensing via RDS(on). |
| ISHARE / VSHARE | Multi-phase current/voltage sharing signals | Enable precise load balancing between stacked TPS543B20 devices; float in single-phase configuration. |
| PGD | Open-drain power-good output | Asserts after soft-start completes and VOUT settles within ±8% of target; requires external pull-up for system sequencing. |
| EN | Enable control input | Internally pulled up to BP; logic-low (<1.45 V) disables converter with 512 µs delay; supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive internal compensation | Eliminates external compensation network across full 300 kHz–2 MHz range - reduces BOM count and layout sensitivity. |
| Stackable 25-A architecture | Two TPS543B20 devices share current, voltage, and clock with <±15% current matching - enables scalable 50-A POL without master/slave complexity. |
| Asynchronous Pulse Injection (API) | Reduces output undershoot during fast load steps by injecting controlled pulses - improves transient response without increasing output capacitance. |
| Safe pre-biased start-up | Prevents reverse current flow into pre-charged output rail - avoids damage to downstream loads and ensures monotonic VOUT ramp. |
| Lossless low-side current sensing | Uses RDS(on) of integrated low-side FET for OCP and current sharing - eliminates sense resistor power loss and board area. |
Applications
| Enterprise Server Core Rails | Wireless Baseband Processing |
|---|---|
|
Use Scenario: Powering multi-core Xeon or AMD EPYC CPU cores requiring tightly regulated 0.8–1.1 V at up to 25 A per rail. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering dynamically scaled core voltage with differential remote sensing and fast transient response. Use Value: Maintains ±0.5% output accuracy at socket under 10-A/µs load steps using API and body braking - prevents timing violations in high-frequency processors. |
Use Scenario: Supplying FPGA fabric and DSP clusters in 5G massive MIMO radio units with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: High-efficiency, stackable buck converter operating at 1 MHz to minimize filter size while meeting EN55022 Class B conducted EMI limits. Use Value: Achieves >92% efficiency at 12 VIN/0.9 VOUT/20 A with 1.2 °C/W junction-to-case thermal resistance - enables fanless operation in compact RF enclosures. |
| Enterprise SSD Controller Power | ASIC I/O Voltage Rail |
|
Use Scenario: Delivering clean, low-noise 1.8 V or 3.3 V to NVMe SSD controllers and NAND flash interfaces in data center storage arrays. IC Role / Device Role / Timing Role: Secondary POL regulator with differential remote sensing to compensate for long PCB traces between VRM and PCIe connector. Use Value: Compensates up to 50 mV IR drop across 3-inch PCB run - ensures stable link training and error-free PCIe Gen4/Gen5 operation. |
Use Scenario: Providing 1.2 V or 1.8 V I/O supply to high-speed SerDes blocks in networking ASICs with stringent PSRR and ripple requirements. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency buck converter leveraging internal ramp generator for high PSRR (>60 dB @ 100 kHz) and minimal output ripple. Use Value: Delivers <5 mVpp ripple at 20 A with MLCC-only output filter - meets jitter-sensitive SerDes supply specifications without ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543C20RVFR | Higher 40-A rating, identical 5-mm × 7-mm RVFR package, same pinout, but higher RDS(on) (3.2/1.7 mΩ) and reduced max frequency (1 MHz standalone). | Targets higher-current single-rail applications where 40-A capacity is needed without stacking; not suitable for 2-MHz designs. | Select TPS543C20RVFR only when ≥35-A output is required and 2-MHz operation is unnecessary. |
| MP2960GQKT-Z | Monolithic 30-A buck with PMBus interface, 2.7–16 V input, 0.5–5.5 V output, but no stackability or remote sensing; uses external compensation. | Used where digital telemetry, margining, or sequencing via PMBus is required - lacks analog flexibility and multi-phase support of TPS543B20. | Choose MP2960GQKT-Z only when digital control and telemetry outweigh need for analog precision, stacking, or remote sense. |
Compared with TPS543C20RVFR and MP2960GQKT-Z, the TPS543B20 uniquely combines 25-A analog performance, 2-MHz standalone operation, differential remote sensing, and seamless 2× stacking - making it optimal for high-density, thermally constrained, analog-controlled POL systems.
Availability
TPS543B20 is available at Aetrix Electronics and suitable for enterprise servers, 5G infrastructure equipment, and high-performance SSDs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS543B20 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 power system design.
The TPS543B20 belongs to TI's SWIFT™ synchronous buck converter family, engineered specifically for high-current, low-voltage point-of-load applications in data centers, communications infrastructure, and computing systems demanding density, efficiency, and reliability.
FAQ
What is the maximum supported switching frequency for TPS543B20 in standalone versus stacked configurations?
The TPS543B20 supports up to 2 MHz in standalone mode when configured via RT pin resistor. In stacked (2-phase) operation, the maximum synchronized frequency is limited to 1 MHz to ensure stable current and voltage sharing between devices. This constraint is defined in the device's functional specification and verified across temperature and load conditions - the TPS543B20 must not be operated above 1 MHz when ISHARE/VSHARE pins are active.
How does the TPS543B20 achieve safe start-up into a pre-biased output?
The TPS543B20 prevents reverse current flow during start-up by monitoring the error amplifier input against the soft-start ramp. If the output is pre-biased, no SW pulses occur until the internal ramp exceeds the sensed VOUT. Then, low-side on-time is incrementally increased over 128 cycles before full synchronous rectification engages - ensuring monotonic rise and zero sink current. This behavior is inherent to the TPS543B20 control architecture and requires no external circuitry.
Can the TPS543B20 be used without remote sensing (RSP/RSN pins)?
Yes, the TPS543B20 operates in local-sense mode when RSP and RSN are tied together and connected to the FB node near the IC. However, doing so forfeits differential remote sensing benefits - output accuracy degrades to ±1% due to PCB IR drop, and load-transient regulation suffers. For applications requiring <±0.5% accuracy at the load, RSP/RSN must be routed directly to the load terminals - a requirement explicitly validated for the TPS543B20 in TI's application notes.
What thermal performance can be expected from the TPS543B20 in a standard 4-layer PCB layout?
In a typical 4-layer board with 2 oz copper, 1-in² thermal pad area, and 2x internal ground planes, the TPS543B20 achieves RθJA ≈ 29.1 °C/W and junction temperature rise of ~35°C at 25 A/12 VIN/1 VOUT. This is confirmed by TI's thermal characterization data (SLUSCR1B, Section 7.4) and validated in reference designs like TIDA-01485. Adequate thermal pad solder coverage is mandatory - insufficient solder voiding increases RθJC and risks thermal shutdown.
Is the TPS543B20 pin-compatible with other devices in the TPS543x20 family?
The TPS543B20 shares identical 40-pin RVFR package, pinout, and footprint with TPS543C20RVFR and TPS544B20RVFR, enabling drop-in replacement within the same family. However, functional differences exist: TPS543C20 supports 40-A but caps at 1 MHz; TPS544B20 adds PMBus. All three require identical layout and thermal design - the TPS543B20's compatibility is documented in TI's orderable addendum and mechanical drawings.
TPS543B20RVFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- 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):
- 4V
- Voltage - Input (Max):
- 19V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 25A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-LQFN-CLIP (7x5)
TPS543B20RVFR FAQ
1.How can I place an order for TPS543B20RVFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS543B20RVFR 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 TPS543B20RVFR reliable?
The price and inventory of TPS543B20RVFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS543B20RVFR is usually 5 days.
3.What payment methods are accepted for TPS543B20RVFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS543B20RVFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS543B20RVFR?
TPS543B20RVFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS543B20RVFR 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 TPS543B20RVFR?
For technical support, including TPS543B20RVFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS543B20RVFR requirements.
6.How does Aetrix verify that TPS543B20RVFR is sourced from the original manufacturer or authorized distributors?
All TPS543B20RVFR 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 TPS543B20RVFR meets industry standards.
7.What is the process for return or replacement of TPS543B20RVFR?
All TPS543B20RVFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS543B20RVFR, 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 TPS543B20RVFR part is unused and in its original packaging.
Return procedure for TPS543B20RVFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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