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Texas Instruments TPS543C20RVFR
- Part No.:
- TPS543C20RVFR
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
TPS543C20RVFR.pdf
- Description:
- IC REG BUCK ADJ 40A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,363
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Product details
Overview
TPS543C20RVFR from Texas Instruments is a 40-A, synchronous step-down DC/DC converter with integrated NexFET™ power stage (3 mΩ HS / 0.9 mΩ LS), adaptive internal compensation, and stackable architecture supporting up to 80 A in dual-phase configuration. It operates from 4 V to 14 V input, delivers 0.6 V to 5.5 V output, and features differential remote sensing for precision regulation in enterprise server VRMs and FPGA core rails.
For engineers reviewing the TPS543C20RVFR datasheet, TPS543C20RVFR pinout, TPS543C20RVFR application, or TPS543C20RVFR equivalent, key selection criteria include its 40-A single-phase current rating, 300 kHz–2 MHz programmable switching frequency (300 kHz–1 MHz in stacked mode), lossless low-side current sensing, and 0.5% reference accuracy with VSEL pin strapping - all critical for high-density POL designs requiring tight transient response and thermal scalability.
Technical Context
The TPS543C20RVFR implements emulated peak-current-mode control with an internal ramp generator and integrator, eliminating external compensation components across 300 kHz–2 MHz operation. Its Advanced Current Mode (ACM) architecture enables stable loop response with low-ESR MLCC output capacitors and provides high noise immunity via direct ramp tracking.
It supports dual-phase stacking via ISHARE/VSHARE pins for precise current and voltage sharing, with synchronous clocking (SYNC pin configurable as input or output) and built-in hiccup-mode overcurrent protection. The device integrates a 5-V BP LDO (±5% regulation, 100-mA max) and features safe start-up into prebiased outputs, asynchronous pulse injection (API), and body braking for undershoot/overshoot suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 40 A continuous per device; supports 80-A dual-phase stacking with current/voltage sharing |
| Input Voltage Range | 4 V to 14 V - compatible with 5 V, 12 V intermediate bus architectures in telecom and server systems |
| Output Voltage Range | 0.6 V to 5.5 V, set via resistor on VSEL pin with ±0.5% accuracy - suitable for ASIC/FPGA core and I/O rails |
| Switching Frequency | 300 kHz to 2 MHz (standalone); 300 kHz to 1 MHz (stacked) - enables EMI optimization and inductor size reduction |
| Power Stage RDS(on) | 3 mΩ (HS) / 0.9 mΩ (LS) - enables >90% efficiency at 12 VIN/1 VOUT, 20 A, reducing thermal footprint |
| Thermal Resistance | RθJC(bot) = 1 °C/W - optimized bottom-side thermal path via exposed PGND thermal tab for high-power dissipation |
| Remote Sensing | Differential RSP/RSN inputs with 75 dB open-loop gain and ±1 mV offset - maintains ±0.5% output regulation under PCB IR drop |
Pinout & Package
TPS543C20RVFR uses a 40-pin LQFN-CLIP (RVF) package with 5.0 mm × 7.0 mm body size, 0.5-mm pitch, and single exposed thermal pad internally connected to PGND. Thermal pad solder coverage is mandatory for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RSP | Remote sense positive input | Connects to load-side VOUT for precision regulation; enables <±0.5% output tolerance despite PCB trace resistance |
| 2 RSN | Remote sense negative input | Connects to load-side GND; forms Kelvin sense pair with RSP to reject common-mode noise and IR drop |
| 7 BOOT | High-side gate driver bootstrap supply | Requires 100-nF capacitor to SW; series 1–10 Ω resistor reduces SW node ringing during HS FET turn-on |
| 8–12 SW | Power switch node | Connects to output inductor; carries full switching current; requires low-inductance layout and snubber for EMI control |
| 13–20 PGND | Power ground return | Low-impedance return path for low-side FET; must be tied directly to thermal pad for optimal thermal and electrical performance |
| 21–25 PVIN | Power stage input supply | Multiple pins reduce current density; requires 10–100 nF ceramic capacitor close to IC for high-frequency decoupling |
| 26 VDD | Controller bias supply | 4–16 V input; powers internal logic and drivers; UVLO threshold at 3.8 V ensures reliable startup |
| 27 GND | Controller ground | Separate analog ground return; connects directly to PCB thermal pad; bypass capacitor required to PVIN |
| 28 BP | 5-V LDO output | Powers internal gate drivers; requires ≥2.2 µF ceramic capacitor to thermal pad (PGND) for stability |
| 29 AGND | Analog ground reference | Reference for internal comparators, reference, and sensing circuits; must be star-connected to minimize noise coupling |
| 30 ILIM | Overcurrent limit setting | Resistor to AGND sets hiccup-mode OC threshold (e.g., 33.2 kΩ = 35 A ±10%) |
| 31 ISHARE | Current share signal | Enables master/slave current balancing in stacked configurations; float for single-phase use |
| 32 VSHARE | Voltage share signal | Synchronizes output voltage between stacked devices; float for single-phase use |
| 33 EN | Enable input | Active-high logic; 1.45–1.75 V threshold with 300 mV hysteresis for noise-immune sequencing |
| 34 PGD | Open-drain power-good | Asserts after soft-start completes and VOUT reaches ±8% of target; 1.024-ms delay ensures stable regulation |
| 35 SYNC | Frequency synchronization | Configurable as sync-in or sync-out via MODE/RT pins; supports 300 kHz–1 MHz stacking with <10% phase jitter |
| 36 VSEL | Reference voltage selection | Resistor to AGND selects 0.6–1.1 V internal reference (e.g., open = 1.0 V, 121 kΩ = 1.05 V) |
| 37 SS | Soft-start timing | Resistor to AGND sets ramp time from 0.5 ms to 32 ms; controls inrush current into bulk capacitance |
| 38 RT | Frequency programming | Resistor to AGND sets switching frequency (e.g., 40.2 kΩ = 500 kHz); also defines sync point in stacked mode |
| 39 MODE | Functional mode control | Selects API/body braking, OC threshold, and master/slave behavior in multi-phase setups |
| 40 RAMP | Internal loop ramp adjustment | Resistor to AGND selects one of 10 ramp slopes to optimize loop stability with specific inductor/capacitor combinations |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated ACM control | Eliminates external compensation network while maintaining stability across 300 kHz–2 MHz and wide output capacitor ESR ranges |
| Stackable 2-phase architecture | Enables 80-A total output with matched current sharing (±15% error at ≥20 A/phase) and synchronized CLK without external controllers |
| Lossless low-side current sensing | Uses MOSFET RDS(on) for accurate, temperature-stable current monitoring - no sense resistor power loss or board area |
| Asynchronous Pulse Injection (API) | Reduces output undershoot by up to 40% during load steps by injecting controlled pulses during light-load conditions |
| Differential remote sensing | Maintains ±0.5% output regulation at the load point despite >100 mΩ PCB trace resistance between IC and load |
| Safe start-up into prebiased output | Prevents reverse current flow when enabled into existing VOUT - essential for hot-swap and redundant power systems |
Applications
| Enterprise Server Core Rail | Network Switch ASIC Power |
|---|---|
|
Use Scenario: Powers 12 nm ASIC cores in dual-socket servers requiring 0.8 V @ 40 A with <±1% regulation tolerance. IC Role / Device Role / Timing Role: Primary point-of-load regulator with differential remote sensing and stackable capability for dynamic current scaling. Use Value: Delivers 92% efficiency at 12 VIN/0.8 VOUT, 40 A while maintaining <15 mV output deviation under 20-A/µs load transients. |
Use Scenario: Supplies 1.2 V @ 35 A to high-speed SerDes blocks in 100G Ethernet switches with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck with programmable 500 kHz–1 MHz switching to meet CISPR-22 Class B conducted emissions. Use Value: Achieves <15 mVpp output ripple at full load using only 4× 22-µF X5R MLCCs due to low-noise ACM control and integrated power stage. |
| FPGA I/O Bank Supply | Storage Controller DDR Interface |
|
Use Scenario: Generates 1.8 V @ 25 A for FPGA I/O banks in NVMe SSD controllers where layout space is constrained. IC Role / Device Role / Timing Role: Compact 5 mm × 7 mm POL regulator with thermal pad mounted to inner copper layer for 2.5 W dissipation. Use Value: Enables 4-layer PCB design with <1.5°C/W junction-to-board thermal resistance, avoiding need for heatsinks or airflow. |
Use Scenario: Provides 1.2 V @ 18 A to DDR4 memory interfaces in enterprise storage arrays requiring fast transient response. IC Role / Device Role / Timing Role: Dual-phase stack (2× TPS543C20RVFR) with ISHARE/VSHARE for <5% current imbalance and <100 ns phase skew. Use Value: Reduces output voltage droop to <20 mV during 15-A load steps (100 ns rise time) via API and body braking enhancements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543B20RJER | 25-A rating, same 4–14 V input, but lacks stackable ISHARE/VSHARE pins and has lower 1.2-mΩ LS RDS(on) | Single-phase only; not suitable for >40-A or multi-phase coordinated regulation | Choose when 25-A capacity suffices and board space or cost constraints preclude 40-A solution |
| MP2960GQZ-0000-P | 40-A monolithic buck with PMBus interface, 0.6–3.3 V output range, and digital loop compensation - no analog VSEL/SS/RT pins | Requires firmware integration and PMBus host; lacks differential remote sensing and API/body braking | Prefer when digital telemetry, margining, and fault logging are required over analog simplicity and transient enhancement |
Compared with TPS543C20RVFR, TPS543B20RJER offers lower cost and smaller footprint but sacrifices 60% current headroom and stacking capability, while MP2960GQZ-0000-P adds digital control overhead and removes analog tuning flexibility critical for rapid prototyping and EMI-sensitive analog subsystems.
Availability
TPS543C20RVFR is available at Aetrix Electronics and suitable for enterprise server VRMs, network switch ASIC supplies, and FPGA I/O rail designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS543C20RVFR 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 system-level power architecture.
The TPS543C20RVFR belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-current, high-density point-of-load applications in datacenter, telecom, and industrial computing where thermal performance, transient response, and scalability are critical.
FAQ
What is the maximum input voltage rating for the TPS543C20RVFR?
The TPS543C20RVFR has an absolute maximum input voltage (VIN) rating of 16 V, but its recommended operating range is strictly 4 V to 14 V per the datasheet. Exceeding 14 V in normal operation risks violating thermal and reliability specifications, and the device includes VIN UVLO at 3.2 V (with 0.2 V hysteresis) to prevent unsafe startup. Always observe the 14-V upper limit for sustained operation.
How does the TPS543C20RVFR achieve current sharing in stacked configurations?
The TPS543C20RVFR achieves current sharing in dual-phase stacks using dedicated ISHARE and VSHARE pins that form a closed-loop analog feedback network between master and slave devices. This method maintains ±15% current balance at ≥20 A/phase without external DACs or digital controllers. The TPS543C20RVFR's internal current-sense amplifier rejects temperature drift, ensuring stable sharing across –40°C to 125°C junction temperatures.
Can the TPS543C20RVFR operate safely into a prebiased output?
Yes, the TPS543C20RVFR supports safe start-up into a prebiased output through its anti-cross-conduction logic and valley-point current sensing. When enabled with existing VOUT present, the device inhibits high-side FET turn-on until the internal reference ramps above the sensed output voltage, preventing reverse current flow and protecting downstream loads. This feature is confirmed in the datasheet's "Safe Start-Up into Prebiased Output" section.
What is the purpose of the RAMP pin on the TPS543C20RVFR?
The RAMP pin on the TPS543C20RVFR selects one of ten internal ramp slopes used in its emulated peak-current-mode control loop. By connecting a resistor to AGND, designers tune the internal ramp to match their selected inductor value and output capacitor ESR, optimizing phase margin and transient response without external compensation. This enables robust stability across diverse output filter configurations.
Does the TPS543C20RVFR require external compensation components?
No, the TPS543C20RVFR does not require external compensation components. Its Advanced Current Mode (ACM) control architecture integrates an internal ramp generator and compensator, enabling stable operation across its full 300 kHz–2 MHz frequency range and with low-ESR MLCC output capacitors. This eliminates the need for traditional Type II or III compensation networks, reducing BOM count and layout complexity.
TPS543C20RVFR 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):
- 16V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 40A
- 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)
TPS543C20RVFR FAQ
1.How can I place an order for TPS543C20RVFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS543C20RVFR 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 TPS543C20RVFR reliable?
The price and inventory of TPS543C20RVFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS543C20RVFR is usually 5 days.
3.What payment methods are accepted for TPS543C20RVFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS543C20RVFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS543C20RVFR?
TPS543C20RVFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS543C20RVFR 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 TPS543C20RVFR?
For technical support, including TPS543C20RVFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS543C20RVFR requirements.
6.How does Aetrix verify that TPS543C20RVFR is sourced from the original manufacturer or authorized distributors?
All TPS543C20RVFR 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 TPS543C20RVFR meets industry standards.
7.What is the process for return or replacement of TPS543C20RVFR?
All TPS543C20RVFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS543C20RVFR, 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 TPS543C20RVFR part is unused and in its original packaging.
Return procedure for TPS543C20RVFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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