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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments TPS543C20RVFT

Name: TPS543C20RVFT
Brand: Texas Instruments
SKU: TPS543C20RVFT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS543C20RVFT

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 40-PowerLFQFN

Datasheet:: TPS543C20RVFT.pdf

Description:: IC REG BUCK ADJ 40A 40LQFN

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Product details

Overview

TPS543C20RVFT 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 across two devices. It operates from 4 V to 14 V input, delivers 0.6 V–5.5 V output, and features differential remote sensing for precision regulation in high-current server and networking POL applications.

For engineers reviewing the TPS543C20RVFT datasheet, TPS543C20RVFT pinout, TPS543C20RVFT application, or TPS543C20RVFT equivalent, key selection considerations include its 40-A single-device rating, 300 kHz–2 MHz programmable switching frequency (300 kHz–1 MHz when stacked), lossless current sensing, and support for safe startup into prebiased outputs - all in a thermally enhanced 40-pin LQFN-CLIP (5 mm × 7 mm) package.

Technical Context

The TPS543C20RVFT implements emulated peak-current-mode control with an internal ramp generator and integrator, eliminating external compensation components across its full 300 kHz–2 MHz operating range. Its Advanced Current Mode (ACM) architecture enables stable operation with low-ESR MLCC output capacitors and provides high noise immunity via a dedicated ramp selection network (10 resistor-programmable options).

It supports dual-phase stacking with precise current sharing (±15% accuracy at ≥20 A/phase), voltage sharing, and clock synchronization via ISHARE, VSHARE, and SYNC pins. Asynchronous Pulse Injection (API) and body braking reduce undershoot and overshoot during load transients, while safe prebias startup prevents damage to sensitive downstream loads.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	40 A continuous per device; supports 80 A in 2× stacked configuration with matched current/voltage sharing
Input Voltage Range	4 V to 14 V - compatible with 5 V, 12 V intermediate bus architectures common in enterprise servers and switches
Output Voltage Range	0.6 V to 5.5 V, set via VSEL pin strap; 0.5% reference accuracy ensures tight regulation for ASIC/FPGA core rails
Switching Frequency	300 kHz–2 MHz (standalone); 300 kHz–1 MHz (stacked) - programmable via RT pin resistor for EMI optimization and layout flexibility
Power Stage R_DS(on)	3 mΩ (HS) / 0.9 mΩ (LS) - enables >90% efficiency at 12 V_IN/1 V_OUT/20 A with minimal thermal derating
Current Sensing	Lossless low-side sensing with ±10% overcurrent tolerance - eliminates sense resistor losses and improves thermal performance
Thermal Resistance	R_θJC(bot) = 1 °C/W - single thermal pad directly connected to PGND enables efficient heat transfer to PCB ground plane

Pinout & Package

TPS543C20RVFT is housed in a 40-pin LQFN-CLIP (RVFT) package measuring 5.00 mm × 7.00 mm with 0.5-mm pitch and a single exposed thermal pad internally connected to PGND. The package supports high-density, thermally robust layouts ideal for multi-rail POL systems.

Pin/Terminal	Circuit Role	Design Meaning
1,2	RSP, RSN	Differential remote sense inputs - connect directly to load-side V_OUT and GND to compensate for IR drop in PCB traces
7	BOOT	Bootstrap supply for high-side gate driver - requires 100-nF capacitor to SW; optional series resistor (1–10 Ω) reduces switching node ringing
8–12	SW	Switch node output - connects to power inductor; high dv/dt demands careful layout and snubber placement
13–20, 27, –	PGND, GND, Thermal Tab	Low-impedance return paths - thermal tab must be soldered to large PGND copper area for R_θJC(bot) = 1 °C/W performance
21–25	PVIN	High-current input power pins - require local 10–100 nF bypass capacitors to PGND to suppress MOSFET stress and EMI
30	ILIM	Overcurrent threshold programming - resistor to AGND sets trip point (e.g., 33.2 kΩ = 35 A ±10%)
31,32	ISHARE, VSHARE	Multi-phase current/voltage balancing signals - float for single-phase use; enable precise load sharing in stacked configurations
33	EN	Enable input with 1.45–1.75 V threshold and 300 mV hysteresis - supports sequencing and fault shutdown
34	PGD	Open-drain power-good indicator - asserts after soft-start completes and V_OUT settles within ±8% of target
35	SYNC	Bidirectional sync interface - configurable as master (sync out) or slave (sync in) via MODE/RT pin settings
36	VSEL	Reference voltage selection - resistor to AGND programs 0.6–1.1 V internal reference with 0.5% accuracy
37	SS	Soft-start timing control - resistor to AGND selects 0.5–32 ms ramp time to limit inrush current into bulk capacitance
38	RT	Frequency setting - resistor to AGND programs switching frequency; also defines sync point in stacked mode
39	MODE	Functional mode control - configures API/body braking, OC threshold, and master/slave behavior in stackable operation
40	RAMP	Internal loop ramp adjustment - resistor to AGND selects one of 10 ramp slopes to optimize stability with specific LC combinations

Key Features

Feature	Design Value
Internally compensated ACM control	Eliminates external compensation network - simplifies design, reduces BOM count, and maintains stability across 300 kHz–2 MHz without tuning
Stackable 2× architecture	Enables 80-A output with automatic current/voltage sharing and synchronized switching - avoids phase-interleaving complexity and timing skew
Differential remote sensing	Compensates for up to 100 mV IR drop between IC and load - ensures ±0.5% output accuracy at point-of-load under dynamic load conditions
Asynchronous Pulse Injection (API)	Reduces output undershoot by >40% during fast load steps - critical for protecting low-voltage FPGA/ASIC cores during burst-mode operation
Safe prebias startup	Allows controlled ramp-up even when output capacitor is precharged - prevents reverse current flow and protects downstream components
Integrated 5-V BP LDO	Supplies gate driver and analog circuitry with 4.5–5.5 V output - eliminates need for external bias rail and improves system-level reliability

Applications

Enterprise Server Core Rails	Network Switch ASIC Power
Use Scenario: Delivering 0.8 V @ 40 A to high-performance CPU/GPU cores in 1U rack servers with strict thermal envelope constraints. IC Role / Device Role / Timing Role: Primary point-of-load regulator with integrated power stage and adaptive current-mode control. Use Value: Achieves >92% efficiency at 12 V_IN/0.8 V_OUT/30 A while maintaining <±1% output regulation under 20-A/µs transient steps via API and body braking.	Use Scenario: Powering 1.2 V I/O and 0.85 V SerDes rails in 100G Ethernet switch fabric ASICs requiring ultra-low noise and fast transient response. IC Role / Device Role / Timing Role: High-accuracy, low-noise POL converter with differential remote sensing and programmable soft-start. Use Value: Maintains ±5 mV output deviation during 15-A load steps due to lossless current sensing and 10-MHz unity-gain bandwidth remote amplifier.
Storage Controller SoC Supply	AI Accelerator Module Rail
Use Scenario: Generating 1.8 V @ 25 A for NVMe SSD controller SoCs in enterprise storage arrays where power density and thermal management are critical. IC Role / Device Role / Timing Role: Thermally optimized buck converter with direct thermal pad connection to PCB ground plane. Use Value: Delivers full 25-A load at 125°C junction temperature using only 2-layer board with 2 oz copper, enabled by R_θJC(bot) = 1 °C/W.	Use Scenario: Providing 0.75 V @ 40 A to AI inference accelerators with rapid, asymmetric load transients (e.g., 0→35 A in <1 µs). IC Role / Device Role / Timing Role: Stackable high-current regulator with synchronized dual-phase operation and hiccup-mode overcurrent protection. Use Value: Supports 80-A peak demand via 2× TPS543C20RVFT stacking while limiting fault current to 60 A (HS short-circuit threshold) and enabling graceful recovery.

Enterprise Server Core Rails

Network Switch ASIC Power

Use Scenario: Delivering 0.8 V @ 40 A to high-performance CPU/GPU cores in 1U rack servers with strict thermal envelope constraints.

IC Role / Device Role / Timing Role: Primary point-of-load regulator with integrated power stage and adaptive current-mode control.

Use Value: Achieves >92% efficiency at 12 V_IN/0.8 V_OUT/30 A while maintaining <±1% output regulation under 20-A/µs transient steps via API and body braking.

Use Scenario: Powering 1.2 V I/O and 0.85 V SerDes rails in 100G Ethernet switch fabric ASICs requiring ultra-low noise and fast transient response.

IC Role / Device Role / Timing Role: High-accuracy, low-noise POL converter with differential remote sensing and programmable soft-start.

Use Value: Maintains ±5 mV output deviation during 15-A load steps due to lossless current sensing and 10-MHz unity-gain bandwidth remote amplifier.

Storage Controller SoC Supply

AI Accelerator Module Rail

Use Scenario: Generating 1.8 V @ 25 A for NVMe SSD controller SoCs in enterprise storage arrays where power density and thermal management are critical.

IC Role / Device Role / Timing Role: Thermally optimized buck converter with direct thermal pad connection to PCB ground plane.

Use Value: Delivers full 25-A load at 125°C junction temperature using only 2-layer board with 2 oz copper, enabled by R_θJC(bot) = 1 °C/W.

Use Scenario: Providing 0.75 V @ 40 A to AI inference accelerators with rapid, asymmetric load transients (e.g., 0→35 A in <1 µs).

IC Role / Device Role / Timing Role: Stackable high-current regulator with synchronized dual-phase operation and hiccup-mode overcurrent protection.

Use Value: Supports 80-A peak demand via 2× TPS543C20RVFT stacking while limiting fault current to 60 A (HS short-circuit threshold) and enabling graceful recovery.

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
TPS543B20RVFT	25-A rating, identical pinout and feature set but lower current capability and no stackable frequency limitation (supports full 300 kHz–2 MHz when standalone)	Suitable for ≤25-A single-rail applications where space or cost constraints preclude dual-device stacking	Select when full 40-A capacity is unnecessary and thermal margin allows smaller solution size.
MP8770GQ-Z	40-A monolithic buck with 4.5–16-V input, but lacks differential remote sensing, stackability, and programmable ramp; uses external compensation	Applicable in industrial motor drives or telecom power where remote sensing and multi-phase coordination are not required	Choose for simpler designs needing basic 40-A conversion without advanced POL features like current sharing or API.

Compared with TPS543C20RVFT, the TPS543B20RVFT offers identical integration and control architecture at reduced current capacity, while the MP8770GQ-Z trades POL-specific features (remote sense, stacking, adaptive ramp) for broader input range and lower BOM count - making TPS543C20RVFT optimal for high-precision, high-density server and networking rails.

Availability

TPS543C20RVFT is available at Aetrix Electronics and suitable for enterprise server power delivery, AI accelerator module design, and high-speed networking infrastructure requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS543C20RVFT 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 over 50 years of innovation in high-reliability power conversion solutions.

The TPS543C20RVFT belongs to TI's SWIFT™ family of high-current synchronous buck converters, engineered specifically for demanding point-of-load applications in datacenter, networking, and AI hardware where efficiency, thermal performance, and multi-phase scalability are critical.

FAQ

What is the maximum input voltage supported by the TPS543C20RVFT?

The TPS543C20RVFT supports a recommended operating input voltage range of 4 V to 14 V. Its absolute maximum VIN rating is 16 V, but sustained operation above 14 V violates recommended conditions and may impact reliability or trigger overvoltage protection. The device is optimized for 5 V and 12 V intermediate bus systems common in enterprise servers and switches, and the 14-V upper limit aligns with standard ATX and telecom power specifications.

How does the TPS543C20RVFT achieve stable operation without external compensation components?

The TPS543C20RVFT uses an internally compensated Advanced Current Mode (ACM) control architecture with an integrated ramp generator and analog integrator. This emulated peak-current-mode topology eliminates the need for external Type-II or Type-III compensation networks by embedding stability across its full 300 kHz–2 MHz frequency range. The internal ramp tracks inductor current dynamics, enabling robust transient response and compatibility with low-ESR ceramic output capacitors - a key enabler of compact, high-density POL designs.

Can the TPS543C20RVFT be used in a single-phase configuration without stacking?

Yes, the TPS543C20RVFT operates fully functional in standalone mode delivering up to 40 A. Pins ISHARE and VSHARE are floated, SYNC is configured as free-running oscillator (via RT resistor), and MODE is set for single-phase operation. All features - including differential remote sensing, programmable soft-start, and API - remain active. Stacking is optional and adds scalability; it does not alter baseline functionality or require firmware or external logic to operate as a single-phase converter.

What thermal management requirements apply to the TPS543C20RVFT's exposed thermal pad?

TPS543C20RVFT's thermal pad is internally connected to PGND and must be soldered to a large, low-thermal-resistance PCB copper area tied to the power ground plane. TI specifies R_θJC(bot) = 1 °C/W, achievable only with ≥80% solder coverage and ≥4 thermal vias (0.3-mm diameter, filled or capped) connecting the pad to inner ground layers. Failure to meet this requirement risks exceeding the 125°C maximum junction temperature under full 40-A load, triggering thermal shutdown or accelerated aging.

How is output voltage accuracy maintained under varying load and temperature conditions with the TPS543C20RVFT?

The TPS543C20RVFT achieves ±0.5% internal reference voltage accuracy over –40°C to 125°C, combined with differential remote sensing that measures V_OUT directly at the load. This compensates for PCB trace resistance up to 100 mV, ensuring regulation remains within ±1% at the point-of-load despite current-induced IR drops. The remote amplifier features 75 dB open-loop gain and ±10 V/µs slew rate, preserving accuracy during fast transients - critical for powering modern low-voltage ASICs and FPGAs.

TPS543C20RVFT 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)

TPS543C20RVFT FAQ

1.How can I place an order for TPS543C20RVFT through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS543C20RVFT 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 TPS543C20RVFT reliable?

The price and inventory of TPS543C20RVFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS543C20RVFT is usually 5 days.

3.What payment methods are accepted for TPS543C20RVFT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS543C20RVFT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS543C20RVFT?

TPS543C20RVFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS543C20RVFT 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 TPS543C20RVFT?

For technical support, including TPS543C20RVFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS543C20RVFT requirements.

6.How does Aetrix verify that TPS543C20RVFT is sourced from the original manufacturer or authorized distributors?

All TPS543C20RVFT 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 TPS543C20RVFT meets industry standards.

7.What is the process for return or replacement of TPS543C20RVFT?

All TPS543C20RVFT units undergo pre-shipment inspection (PSI). If there is an issue with TPS543C20RVFT, 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 TPS543C20RVFT part is unused and in its original packaging.

Return procedure for TPS543C20RVFT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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