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Texas Instruments TPS543B25RYSR
- Part No.:
- TPS543B25RYSR
- Manufacturer:
- Texas Instruments
- Package:
- 17-PowerWFQFN
- Datasheet:
-
TPS543B25RYSR.pdf
- Description:
- IC REG BUCK ADJ 25A 17WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,904
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Product details
Overview
TPS543B25RYSR from Texas Instruments is a 25A synchronous step-down DC/DC converter with integrated 6.5mΩ high-side and 2mΩ low-side MOSFETs, fixed-frequency advanced current mode (ACM) control, 4V–18V input range, 0.5V–7V output range, and true differential remote sense amplifier - deployed in wireless infrastructure power rails requiring tight regulation under fast load transients.
For engineers reviewing the TPS543B25RYSR datasheet, TPS543B25RYSR pinout, TPS543B25RYSR application, or TPS543B25RYSR equivalent, key selection criteria include its 2.2MHz max switching frequency, selectable soft-start (1/2/4/8ms), ±0.5% reference accuracy over –40°C to 150°C, monotonic prebias start-up, and five resistor-programmable PWM ramp options for loop optimization with MLCC output filters.
Technical Context
The TPS543B25RYSR implements an internally compensated advanced current mode (ACM) control architecture that emulates inductor current using three programmable internal ramp slopes - enabling stable operation with low-ESR ceramic capacitors without external compensation. It operates exclusively in forced continuous conduction mode (FCCM) across its full 500kHz–2.2MHz switching frequency range.
Its dual-stage enable logic requires both EN >1.25V *and* VIN >4.0V to initiate soft-start; internal LDO powers VDRV (4.5V nominal) to drive gate drivers, while VCC is derived via a 10Ω resistor from VDRV. The device integrates full fault protection: output OVP/UVP, input UVLO, thermal shutdown (175°C trip), hiccup-mode recovery, and bidirectional current sensing for peak/valley/overcurrent limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 18V - supports 5V, 12V, and 15V intermediate bus architectures without external regulators. |
| Output Current | 25A continuous - delivered via integrated 6.5mΩ HS / 2mΩ LS MOSFETs with RDS(on) specified at TJ = 25°C. |
| Switching Frequency | 500kHz / 750kHz / 1MHz / 1.5MHz / 2.2MHz - selected by RFSEL resistor; synchronizable to external clock ±20%. |
| Reference Accuracy | ±0.5% over –40°C to +150°C - enables <±6mV error at 1.2V output for high-precision core supplies. |
| Soft-Start Time | 1ms / 2ms / 4ms / 8ms - selected by RMSEL resistor; ensures monotonic startup into prebiased outputs. |
| Remote Sense | True differential RSA - rejects up to ±100mV common-mode noise on GOSNS/FB lines for accurate point-of-load regulation. |
| Thermal Rating | 150°C max operating junction temperature - validated for wireless base station and optical module ambient environments. |
Pinout & Package
TPS543B25RYSR is housed in a thermally enhanced 2.5mm × 4.5mm, 17-pin WQFN-FCRLF (RYS) package with 0.5mm pitch and exposed thermal pad. The HotRod™ flip-chip layout minimizes parasitic inductance for high-frequency switching stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | High-side gate driver supply | Connect 0.1μF capacitor to SW; critical for reliable HS FET turn-on at high duty cycles. |
| VIN (4,9) | Main input power | Dual pins reduce IR drop and improve high-current routing; require local 1μF bypass to PGND each. |
| SW | Power switch node | Direct connection to output inductor; high di/dt path requiring minimized loop area for EMI control. |
| FB | Feedback input | Connects to resistor divider midpoint; used with GOSNS for differential remote sensing of VOUT. |
| GOSNS | Ground sense return | Completes differential sense pair with FB; rejects PCB trace IR drop between IC and load. |
| EN | Enable with adjustable UVLO | Internal pullup allows default enable; resistor divider from VIN enables programmable input undervoltage lockout. |
| SYNC/FSEL | Frequency select & sync input | Resistor-to-AGND sets frequency; square-wave clock (20–80% duty) synchronizes switching externally. |
| MSEL | Mode select | Resistor-to-AGND configures current limit (25A/20A), soft-start rate, and PWM ramp amplitude. |
| PG | Open-drain power-good | Asserts after VOUT reaches 91% VREF and remains valid until VOUT drops below 106.5% VREF or faults occur. |
| VDRV | Internal LDO output | 4.5V regulated supply for gate drivers; bypass with 2.2μF to PGND; feeds VCC via 10Ω resistor. |
| VCC | Analog control supply | Derived from VDRV; bypass with 0.1μF to AGND; powers internal logic and reference circuits. |
| PGND (5,8,16,17) | Power ground return | Four dedicated pins minimize ground bounce; internally tied to low-side MOSFET source. |
| AGND (1,12) | Analog ground reference | Separate from PGND; connects to feedback network and sense amplifier; must be star-connected. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated ACM control | Eliminates external compensation components while maintaining stability with ceramic output capacitors across full load/line/temp range. |
| True differential remote sense (RSA) | Rejects voltage drop in PCB traces and connectors, enabling ±0.5% regulation accuracy at point-of-load under 25A dynamic loads. |
| Selectable PWM ramp options | Three internal ramp slopes configured by MSEL resistor optimize loop gain/phase margin for specific inductor DCR and output capacitance values. |
| Monotonic prebias start-up | Prevents reverse current flow during startup into powered systems - essential for hot-swap and multi-rail sequencing applications. |
| Full fault protection suite | Includes OVP, UVP, input UVLO, overtemperature (175°C), and cycle-by-cycle overcurrent with hiccup recovery - no external monitoring required. |
Applications
| Wireless Infrastructure Power | Optical Network Transceivers |
|---|---|
|
Use Scenario: Powering FPGA, ASIC, and RF front-end ICs in 5G macro/baseband units where ambient temperature exceeds 85°C and transient response must settle within 10μs. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 1.2V/25A with differential remote sense to compensate for PCB voltage drop across backplane connectors. Use Value: Enables compact 12mm² solution size at 2.2MHz, reduces thermal derating via 150°C TJ rating, and maintains <±1% output deviation during 10A/μs load steps. |
Use Scenario: Supplying 3.3V/15A to SFP+/QSFP-DD modules in optical line cards with strict EMI limits and zero tolerance for output voltage overshoot. IC Role / Device Role / Timing Role: High-efficiency buck converter synchronized to system clock to shift switching harmonics away from data-band frequencies (10–56Gbps). Use Value: Achieves >93% efficiency at 12VIN/3.3VOUT, eliminates external sync circuitry via SYNC/FSEL pin, and prevents damage from hot-plug-induced transients via monotonic start-up. |
| Test & Measurement Equipment | Medical Imaging Power Rails |
|
Use Scenario: Generating ultra-stable 1.0V/20A for ADC/DAC signal chains in high-resolution oscilloscopes where PSRR and ripple must be <10μVRMS. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency buck with 0.5% reference and differential sensing - placed adjacent to analog signal paths with isolated AGND/PGND planes. Use Value: Delivers <20μVPP output ripple at 1MHz, suppresses switching noise coupling via ACM's high SNR ramp, and avoids beat frequencies through external clock sync. |
Use Scenario: Providing 1.8V/25A to FPGA-based image reconstruction engines in portable ultrasound systems with battery-backed 12V input and strict safety certifications. IC Role / Device Role / Timing Role: Safety-critical PoL regulator featuring redundant fault detection (dual OVP/UVP thresholds), thermal shutdown with 12°C hysteresis, and RoHS-compliant packaging. Use Value: Meets IEC 60601-1 creepage/clearance requirements via 2.5mm × 4.5mm footprint, supports battery brownout recovery with 1V min-PG enable, and guarantees fail-safe shutdown before junction exceeds 175°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543B22RYSR | 20A rated; identical pinout, package, and feature set except lower current capability and reduced HS/LS RDS(on) (7.5mΩ/2.5mΩ). | Suitable for cost-sensitive designs where peak load ≤20A; shares same PCB layout but requires recalculation of thermal margin and inductor saturation current. | Select when full 25A headroom is unnecessary and BOM cost reduction is prioritized over maximum power density. |
| TPS543A26RVL | 16A variant in 3mm × 3.5mm VQFN; lacks differential remote sense, uses standard current mode (not ACM), and supports only 1MHz max fSW. | Targeted at space-constrained industrial PLCs with moderate transient demands; no GOSNS/FB differential pair, so less suitable for long-trace PoL. | Choose for smaller footprint where remote sensing is not required and 16A output suffices - but expect higher output impedance and reduced light-load efficiency. |
Compared with TPS543B25RYSR, the TPS543B22RYSR offers direct pin compatibility and identical features at lower current, while the TPS543A26RVL trades sensing precision and frequency flexibility for reduced size - making TPS543B25RYSR the optimal choice when 25A, differential sensing, and 2.2MHz operation are mandatory.
Availability
TPS543B25RYSR is available at Aetrix Electronics and suitable for wireless infrastructure, optical networking, and medical imaging applications requiring stable component supply, extended temperature operation, and high-reliability power conversion.
Supply support for TPS543B25RYSR 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-performance DC/DC conversion.
The TPS543B25RYSR belongs to TI's SWIFT™ synchronous buck converter family, engineered specifically for high-current, high-temperature, and high-density power delivery in communications and test equipment.
FAQ
What is the maximum supported switching frequency for TPS543B25RYSR?
The TPS543B25RYSR supports a maximum switching frequency of 2.2MHz, selectable via a 4.99kΩ resistor on the SYNC/FSEL pin or by applying an external clock signal within ±20% of that frequency. This enables ultra-compact filter design using small inductors and ceramic capacitors while maintaining high efficiency above 90% at typical loads.
Does TPS543B25RYSR support differential remote sensing?
Yes, TPS543B25RYSR includes a true differential remote sense amplifier (RSA) with dedicated GOSNS and FB pins. This configuration actively compensates for voltage drop across PCB traces and connectors, ensuring ±0.5% output regulation accuracy at the load even under 25A dynamic conditions - a critical capability for high-precision FPGA and ASIC core supplies.
How is current limit configured on TPS543B25RYSR?
Current limit on TPS543B25RYSR is configured using a single resistor (RMSEL) connected from the MSEL pin to AGND. Two standard values - 2.1kΩ for 25A operation and 22.1kΩ for 20A operation - set peak high-side and valley low-side current thresholds, along with soft-start time and PWM ramp amplitude, enabling seamless adaptation to different power stage requirements.
Can TPS543B25RYSR start up into a prebiased output?
Yes, TPS543B25RYSR provides monotonic start-up into prebiased outputs - meaning it will not force reverse current into an already-powered rail. This behavior is intrinsic to its ACM control architecture and is verified across all soft-start configurations, making it safe for use in hot-swap, multi-rail sequencing, and battery-backed systems where output voltage may be present before enable.
What thermal metrics apply to the TPS543B25RYSR RYS package?
The TPS543B25RYSR in the 2.5mm × 4.5mm WQFN-FCRLF (RYS) package has a junction-to-ambient thermal resistance (RθJA) of 33.9°C/W under JEDEC standards and 18.6°C/W on a TI evaluation board. Its junction-to-board (RθJB) is 5.5°C/W, confirming excellent heat transfer to the PCB - essential for sustained 25A operation in sealed or high-ambient enclosures.
TPS543B25RYSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- 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):
- 4V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 25A
- 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)
TPS543B25RYSR FAQ
1.How can I place an order for TPS543B25RYSR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS543B25RYSR 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 TPS543B25RYSR reliable?
The price and inventory of TPS543B25RYSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS543B25RYSR is usually 5 days.
3.What payment methods are accepted for TPS543B25RYSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS543B25RYSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS543B25RYSR?
TPS543B25RYSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS543B25RYSR 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 TPS543B25RYSR?
For technical support, including TPS543B25RYSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS543B25RYSR requirements.
6.How does Aetrix verify that TPS543B25RYSR is sourced from the original manufacturer or authorized distributors?
All TPS543B25RYSR 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 TPS543B25RYSR meets industry standards.
7.What is the process for return or replacement of TPS543B25RYSR?
All TPS543B25RYSR units undergo pre-shipment inspection (PSI). If there is an issue with TPS543B25RYSR, 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 TPS543B25RYSR part is unused and in its original packaging.
Return procedure for TPS543B25RYSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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