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

Texas Instruments TPS543A26RYSR

Name: TPS543A26RYSR
Brand: Texas Instruments
SKU: TPS543A26RYSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS543A26RYSR

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 17-PowerWFQFN

Datasheet:: TPS543A26RYSR.pdf

Description:: IC REG BUCK ADJ 16A 17WQFN

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Product details

Overview

TPS543A26RYSR from Texas Instruments is a 16-A synchronous step-down DC/DC converter with integrated 6.5 mΩ high-side and 2 mΩ low-side MOSFETs, operating from 4 V to 18 V input and delivering 0.5 V to 7 V output at up to 2.2 MHz switching frequency. It employs internally compensated advanced current mode (ACM) control, features true differential remote sensing, and supports monotonic start-up into prebiased outputs - ideal for space-constrained telecom power rails.

For engineers reviewing the TPS543A26RYSR datasheet, TPS543A26RYSR pinout, TPS543A26RYSR application, or TPS543A26RYSR equivalent, key selection considerations include its 17-pin WQFN-HR (RYS) package, selectable 500 kHz–2.2 MHz switching frequencies via RFSEL resistor, ±0.5% reference accuracy over –40°C to 150°C, 16 A current capability with dual selectable limits (12 A / 16 A), and full fault protection including OVP/UVP/OCP/OTP.

Technical Context

The TPS543A26RYSR implements fixed-frequency advanced current mode (ACM) control - an emulated peak current-mode architecture that eliminates external compensation while enabling stable operation with low-ESR MLCC output capacitors. Its internal ramp generator provides noise-immune current sensing and supports three PWM ramp options selected via MSEL resistor.

It integrates dual N-channel MOSFETs, a 4.5 V internal LDO (VDRV), and a true differential remote sense amplifier (GOSNS/FB) for accurate regulation under high-current PCB trace drops. The device supports synchronization to external clocks within ±20% of its programmed frequency and offers four soft-start durations (1/2/4/8 ms) via MSEL configuration.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4 V to 18 V - supports 5 V, 12 V, and 15 V intermediate bus architectures without external regulators.
Output Current	16 A continuous - enables single-chip power delivery for high-performance FPGAs, ASICs, and DSPs.
Switching Frequency	500 kHz to 2.2 MHz - five discrete settings via RFSEL resistor; allows optimization of size vs. efficiency and EMI filtering.
Reference Accuracy	±0.5% over –40°C to +150°C - ensures tight output voltage regulation across industrial and telecom ambient conditions.
MOSFET R_DS(on)	6.5 mΩ (HS) / 2.0 mΩ (LS) at 25°C - minimizes conduction loss and thermal rise in high-current applications.
Soft-Start Time	Selectable 1 ms / 2 ms / 4 ms / 8 ms - prevents inrush current and enables controlled power sequencing.
Thermal Limit	165°C shutdown with 12°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures.
Package	2.5 mm × 4.5 mm, 17-pin WQFN-HR (RYS) - thermally enhanced HotRod™ layout with multiple PGND pins for low-inductance power return.

Pinout & Package

TPS543A26RYSR is housed in a 2.5 mm × 4.5 mm, 17-pin WQFN-HR (RYS) package with 0.5 mm pitch and exposed thermal pad. The package uses TI's HotRod™ flip-chip-on-leadframe construction for reduced parasitic inductance and improved thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
BOOT	High-side gate driver supply	Requires external bootstrap capacitor between BOOT and SW; enables efficient high-side MOSFET drive.
SW	Power switch node	Connects directly to output inductor; high dv/dt node requiring minimized loop area and ground stitching.
VIN (Pins 4, 9)	Main input power	Dual VIN pins reduce IR drop and improve high-current routing; each requires local 1 μF ceramic bypass to PGND.
PGND (Pins 5, 8, 16, 17)	Power ground return	Multiple low-inductance paths to source of low-side MOSFET; must be connected to thermal pad and solid ground plane.
FB	Feedback input	Connects to resistor divider midpoint; used with GOSNS for true differential remote sensing of load voltage.
GOSNS	Ground sense return	Completes Kelvin sense path; rejects PCB trace IR drop to maintain regulation accuracy at point-of-load.
SYNC/FSEL	Frequency select / sync input	Resistor-to-AGND sets switching frequency; accepts external clock (20–80% duty) for system-level timing alignment.
MSEL	Mode select	Resistor-to-AGND configures current limit (12 A / 16 A), soft-start time, and PWM ramp amplitude.
EN	Enable with UVLO	Adjustable undervoltage lockout via resistor divider; internal pullup allows default-enable operation.
PG	Open-drain power-good	Signals valid output after soft-start and regulation; active-low with 0.6 V max drop at 2 mA sink current.
VCC	Analog control supply	Bypassed via 0.1 μF to AGND; powered through 10 Ω resistor from VDRV - isolates analog and power domains.
VDRV	Internal LDO output	4.5 V nominal supply for gate drivers; bypassed with 2.2–10 μF ceramic to PGND for transient current support.
AGND	Analog ground reference	Separate ground for feedback, reference, and control circuits; must be tied to PGND at single point near IC.

Key Features

Feature	Design Value
Internally compensated ACM control	Eliminates external compensation network; enables stable operation with ceramic output capacitors and fast load transients.
True differential remote sense (RSA)	Compensates for up to ±100 mV common-mode offset on GOSNS; maintains ±0.5% output accuracy despite PCB IR drop.
Selectable PWM ramp options	Three ramp amplitudes via MSEL resistor - optimizes loop stability for different inductor values and capacitor ESR.
Monotonic start-up into prebiased outputs	Prevents reverse current flow during hot-insertion or partial-power-up scenarios in multi-rail systems.
Full fault protection suite	Includes output OVP/UVP, input UVLO, cycle-by-cycle overcurrent, hiccup-mode recovery, and thermal shutdown.
Pin compatibility	Pin-to-pin compatible with TPS543A22 and TPS543B22; drop-in replacement possible with TPS543B25T in same RYS package.

Applications

Telecom Baseband Processing	Optical Line Card Power
Use Scenario: Powers FPGA, ADC/DAC, and SerDes blocks on 4G/5G macro base station baseband boards where ambient temperature exceeds 85°C. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 1.0 V @ 12 A to FPGA core with remote sensing across 30 mm PCB traces. Use Value: 150°C max junction rating and 2.2 MHz operation enable compact 12 mm × 12 mm solution size without forced air cooling.	Use Scenario: Supplies 3.3 V @ 8 A to optical transceiver modules (SFP+, QSFP) in dense line cards with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency buck converter synchronized to system clock via SYNC/FSEL pin to shift switching noise out of critical bands. Use Value: Fixed-frequency ACM control and 500 kHz–2.2 MHz programmability allow EMI filter design targeting specific compliance windows (e.g., CISPR 32 Class B).
Test Equipment Power Rails	Medical Imaging Subsystem
Use Scenario: Generates clean, low-noise 1.2 V and 1.8 V rails for high-speed digitizers and arbitrary waveform generators requiring <1% output ripple. IC Role / Device Role / Timing Role: Dual-rail solution using two TPS543A26RYSR devices with independent soft-start sequencing to avoid input surge current. Use Value: ±0.5% reference accuracy and differential remote sensing ensure measurement-grade voltage stability under dynamic load steps.	Use Scenario: Powers image processing SoCs in portable ultrasound units where board space is constrained and thermal management is passive-only. IC Role / Device Role / Timing Role: Single 16 A buck stage replacing multiphase controllers; operates at 1 MHz to minimize inductor size and audible noise. Use Value: Integrated 6.5 mΩ/2.0 mΩ MOSFETs achieve >92% efficiency at 12 V input → 1.0 V/12 A, reducing heat dissipation by 3.5 W vs. discrete solutions.

Telecom Baseband Processing

Optical Line Card Power

Use Scenario: Powers FPGA, ADC/DAC, and SerDes blocks on 4G/5G macro base station baseband boards where ambient temperature exceeds 85°C.

IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 1.0 V @ 12 A to FPGA core with remote sensing across 30 mm PCB traces.

Use Value: 150°C max junction rating and 2.2 MHz operation enable compact 12 mm × 12 mm solution size without forced air cooling.

Use Scenario: Supplies 3.3 V @ 8 A to optical transceiver modules (SFP+, QSFP) in dense line cards with strict EMI limits.

IC Role / Device Role / Timing Role: High-efficiency buck converter synchronized to system clock via SYNC/FSEL pin to shift switching noise out of critical bands.

Use Value: Fixed-frequency ACM control and 500 kHz–2.2 MHz programmability allow EMI filter design targeting specific compliance windows (e.g., CISPR 32 Class B).

Test Equipment Power Rails

Medical Imaging Subsystem

Use Scenario: Generates clean, low-noise 1.2 V and 1.8 V rails for high-speed digitizers and arbitrary waveform generators requiring <1% output ripple.

IC Role / Device Role / Timing Role: Dual-rail solution using two TPS543A26RYSR devices with independent soft-start sequencing to avoid input surge current.

Use Value: ±0.5% reference accuracy and differential remote sensing ensure measurement-grade voltage stability under dynamic load steps.

Use Scenario: Powers image processing SoCs in portable ultrasound units where board space is constrained and thermal management is passive-only.

IC Role / Device Role / Timing Role: Single 16 A buck stage replacing multiphase controllers; operates at 1 MHz to minimize inductor size and audible noise.

Use Value: Integrated 6.5 mΩ/2.0 mΩ MOSFETs achieve >92% efficiency at 12 V input → 1.0 V/12 A, reducing heat dissipation by 3.5 W vs. discrete solutions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS543B22RHLT	Same RHL (3 mm × 3 mm, 16-pin) package; lower 12 A rating; 3.5 V–18 V input; no remote sense amplifier.	Lacks differential remote sensing and monotonic start-up; suited for less demanding point-of-load where trace resistance is negligible.	Choose when board area is tighter (3 mm × 3 mm vs. 2.5 mm × 4.5 mm) and 12 A suffices; not suitable for long-trace or prebiased loads.
TPS543A22RHLR	Same RHL package; identical 16 A rating and 4 V–18 V input; includes remote sense but no selectable PWM ramp or MSEL-configurable soft-start.	Fixed ramp and soft-start limit loop tuning flexibility; lacks three ramp options and four soft-start durations of TPS543A26RYSR.	Use when remote sensing is required but advanced loop optimization is unnecessary; verify stability with target LC components before layout.

Compared with TPS543B22RHLT and TPS543A22RHLR, the TPS543A26RYSR uniquely combines 16 A capability, true differential remote sensing, three PWM ramp options, and four soft-start durations in a thermally optimized 2.5 mm × 4.5 mm package - making it the only option supporting both high-accuracy regulation and fine-grained loop tuning in ultra-compact telecom and test equipment designs.

Availability

TPS543A26RYSR is available at Aetrix Electronics and suitable for wireless infrastructure, optical networking, and medical imaging applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for TPS543A26RYSR 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 decades of expertise in high-reliability DC/DC conversion.

The TPS543A26RYSR belongs to TI's SWIFT™ synchronous buck converter family, engineered for high-density, high-temperature telecom and industrial power delivery where efficiency, thermal robustness, and design simplicity are critical.

FAQ

What is the maximum recommended PCB temperature rise for TPS543A26RYSR under 16 A load?

The TPS543A26RYSR has a maximum junction temperature of 150°C and thermal resistance RθJA of 33.9°C/W (JEDEC standard). At 16 A output with typical efficiency (~92% at 12 V→1.0 V), power dissipation is ~1.1 W. With proper 2-layer thermal pad connection and 4 oz copper, PCB temperature rise stays below 35°C - well within safe margin for industrial ambient (85°C) operation. Always validate with IR thermography in final layout.

Can TPS543A26RYSR operate without external compensation components?

Yes. The TPS543A26RYSR uses internally compensated advanced current mode (ACM) control, eliminating the need for external Type II or Type III compensation networks. Stability is maintained across the full 0.5 V–7 V output range and 500 kHz–2.2 MHz frequency options using only the internal ramp generator and FB/GOSNS feedback path - significantly reducing bill-of-materials and layout complexity.

How does the TPS543A26RYSR handle startup into a precharged output capacitor?

The TPS543A26RYSR supports monotonic start-up into prebiased outputs by disabling high-side MOSFET turn-on until the feedback voltage reaches the soft-start target. This prevents reverse current flow and potential damage to upstream sources or downstream loads - a critical feature for hot-swap and multi-rail sequencing in telecom and test equipment where rail ordering cannot be guaranteed.

What is the minimum output capacitance required for stable operation of TPS543A26RYSR?

TI's reference design (SLVSGC8A) specifies ≥ 220 μF total output capacitance using low-ESR ceramic or polymer capacitors. For 1.0 V/16 A operation at 1 MHz, ≥ 4× 47 μF X5R 0805 MLCCs (188 μF total) with ≤ 5 mΩ combined ESR meet stability and transient response requirements. Lower capacitance may be used with careful loop analysis using TI's WEBENCH® Power Designer.

Is TPS543A26RYSR pin-compatible with any other TI buck converters?

Yes. The TPS543A26RYSR is pin-to-pin compatible with the TPS543A22RYSR and TPS543B22RYSR in the same 17-pin RYS package. It is also drop-in compatible with the TPS543B25TRYSR, which shares identical pinout, thermal pad, and footprint - enabling direct upgrade paths for higher current or enhanced thermal performance without PCB redesign.

TPS543A26RYSR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 17-PowerWFQFN

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):: 18V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.5V

Voltage - Output (Max):: 7V

Current - Output:: 16A

Frequency - Switching:: 500kHz, 750kHz, 1MHz, 1.5MHz, 2.2MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 17-WQFN-FCRLF (2.5x4.5)

TPS543A26RYSR FAQ

1.How can I place an order for TPS543A26RYSR through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS543A26RYSR 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 TPS543A26RYSR reliable?

The price and inventory of TPS543A26RYSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS543A26RYSR is usually 5 days.

3.What payment methods are accepted for TPS543A26RYSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS543A26RYSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS543A26RYSR?

TPS543A26RYSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS543A26RYSR 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 TPS543A26RYSR?

For technical support, including TPS543A26RYSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS543A26RYSR requirements.

6.How does Aetrix verify that TPS543A26RYSR is sourced from the original manufacturer or authorized distributors?

All TPS543A26RYSR 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 TPS543A26RYSR meets industry standards.

7.What is the process for return or replacement of TPS543A26RYSR?

All TPS543A26RYSR units undergo pre-shipment inspection (PSI). If there is an issue with TPS543A26RYSR, 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 TPS543A26RYSR part is unused and in its original packaging.

Return procedure for TPS543A26RYSR:

1.Submit a request within 90 days.

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

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