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Texas Instruments TPS548B28RWWR
- Part No.:
- TPS548B28RWWR
- Manufacturer:
- Texas Instruments
- Package:
- 21-PowerVFQFN
- Datasheet:
-
TPS548B28RWWR.pdf
- Description:
- IC REG BUCK ADJ 20A 21VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:329
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Product details
Overview
TPS548B28RWWR from Texas Instruments is a 20-A synchronous buck converter with D-CAP3™ control, 0.6-V to 5.5-V output range, integrated 7.7-mΩ/2.4-mΩ MOSFETs, differential remote sense, and 3-V internal LDO - designed for high-density server point-of-load regulation at 12-V input.
For engineers reviewing the TPS548B28RWWR datasheet, TPS548B28RWWR pinout, TPS548B28RWWR application, or TPS548B28RWWR equivalent, key selection factors include hiccup current limit behavior, programmable RTRIP-based OCL threshold (19.2–25 A), FCCM/skip-mode selection via MODE pin, and compatibility with all-ceramic output capacitors in space-constrained data center power rails.
Technical Context
The TPS548B28RWWR implements adaptive on-time D-CAP3™ control without external compensation, enabling ultra-fast load-step response (<100 ns transient recovery) and stable operation with low-ESR ceramic output capacitors. Its valley-current-limit protection uses an external resistor (RTRIP) tied to AGND to set trip thresholds from 6 A to 25 A across temperature.
Differential remote sensing (VSNS−/VOSNS+ pins) delivers ±1% reference accuracy over –40°C to +125°C junction temperature, while the integrated 3-V LDO powers internal circuitry and gate drivers - optionally bypassed by 3.13–3.6-V external bias to improve efficiency at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.7–16 V (supports 12-V server rails; requires external bias below 4 V) |
| Output current | 20-A continuous (enabled by integrated 7.7-mΩ HS / 2.4-mΩ LS MOSFETs) |
| Output voltage range | 0.6–5.5 V (set via FB divider; 0.6-V ±1% internal reference over full temp range) |
| Switching frequency | 600/800/1000 kHz (pin-selectable via MODE-to-AGND resistor; D-CAP3 auto-adjusts during transients) |
| Current limit | Programmable 6–25 A valley-current limit (via RTRIP; KOCL = 120 kA·Ω) |
| Remote sense accuracy | ±1% VREF over –40°C to +125°C (differential VSNS−/VOSNS+ enables <10 mV load regulation error) |
| Thermal shutdown | 150°C trip with 30°C hysteresis (enables safe derating in 4×3-mm QFN with RθJA = 49°C/W) |
Pinout & Package
The TPS548B28RWWR is housed in a 4.0 mm × 3.0 mm, 21-pin VQFN-HR (RWW) package with exposed thermal pad. Pin 1 is marked by a dot; top-side silkscreen identifies BOOT, AGND, TRIP, MODE, SS/REFIN, VSNS−, FB, EN, PGOOD, VCC, PGND, VIN, and SW terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOT) | High-side gate driver supply | Connect 0.1-µF ceramic capacitor between BOOT and SW to sustain HS FET drive during duty cycles >90% |
| 2 (AGND) | Analog ground reference | Reference for internal control circuits; must be isolated from PGND to avoid noise coupling into feedback path |
| 3 (TRIP) | Current limit programming | Resistor to AGND sets valley-current OCL threshold (0–20 kΩ → 25–6 A); ±1% tolerance recommended |
| 4 (MODE) | FCCM/skip mode & fSW select | Resistor to AGND selects 600/800/1000 kHz and forces FCCM (0 Ω) or auto-skipping Eco-mode™ |
| 5 (SS/REFIN) | Soft-start timing & external reference | Capacitor to VSNS− sets soft-start time (min 1.5 ms); external DC voltage overrides 0.6-V internal reference for tracking |
| 6 (VSNS−) | Remote sense return | Return path for differential sensing; short to AGND for single-ended configuration; enables <10 mV load regulation error |
| 7 (FB) | Feedback input | Resistor divider from VOUT to VSNS− sets output voltage; 1–40 nA leakage ensures precision at low currents |
| 8 (EN) | Enable control | 1.22-V rising threshold; internal 6.5-MΩ pull-down disables converter when floating; max 5.5-V rating |
| 9 (PGOOD) | Power-good status | Open-drain output with 1.06-ms rise delay and 0.5–5-µs fall delay; asserts high when FB is within ±7.5% of target |
| 10,21 (VIN) | Main input power | Two parallel VIN pins reduce IR drop and thermal resistance; decouple each to PGND with ≥10-µF ceramic per pin |
| 11–18 (PGND) | Power ground | Eight PGND pins minimize parasitic inductance; ≥6 vias per pin required for thermal and EMI performance |
| 19 (VCC) | Internal LDO output | 3.02-V nominal output (2.9–3.12 V over temp); bypass with 2.2-µF/6.3-V ceramic; supports external 3.13–3.6-V bias |
| 20 (SW) | Power switch node | Connects to output inductor; high di/dt node requiring tight layout and minimized loop area to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP3™ adaptive on-time control | Eliminates external compensation components and enables stable all-ceramic capacitor designs with <100-ns load-step response |
| Differential remote sensing | Compensates for PCB trace IR drop to maintain ±1% output accuracy across full load and temperature range |
| Hiccup overcurrent protection | Auto-retry fault recovery after OC or UV events; latch-off only for OV faults to prevent catastrophic failure |
| Programmable soft-start | Capacitor on SS/REFIN sets ramp time (1.5–20 ms typical); prevents inrush current during power-up |
| Prebiased start-up capability | Allows safe startup into precharged output rail without reverse current flow through LS FET body diode |
| External reference input (REFIN) | Enables output voltage tracking of master supply or dynamic margining via external DC source on SS/REFIN pin |
Applications
| Rack Server Point-of-Load | Data Center Switch ASIC Core |
|---|---|
Use Scenario: Regulating 0.8–1.2 V core voltage for dual-socket Xeon Scalable processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary 20-A buck regulator with differential remote sense correcting for VRM-to-CPU voltage drop across motherboard planes. Use Value: Maintains ±1% output accuracy under 10-A/µs load transients using D-CAP3™ control and 0.6-V ±1% reference. | Use Scenario: Powering 1.8-V I/O and 0.85-V SerDes rails on 100-GbE switch ASICs with strict ripple and transient requirements. IC Role / Device Role / Timing Role: High-efficiency, low-noise POL converter with skip-mode operation at idle and FCCM during burst traffic. Use Value: Achieves >90% efficiency at 10-A load (12-V input) while supporting all-ceramic output caps to minimize board area. |
| Hardware Accelerator Card | Industrial PC CPU Rail |
Use Scenario: Delivering 12-A @ 0.95 V to FPGA or AI inference accelerator on PCIe add-in card with limited airflow. IC Role / Device Role / Timing Role: Compact 4×3-mm buck converter with thermal shutdown (150°C) and hiccup OCP for unattended operation. Use Value: Sustains 20-A peak current with integrated MOSFETs and RθJA = 49°C/W, enabling fanless cooling in dense enclosures. | Use Scenario: Supplying 1.05-V core voltage to Intel Atom or AMD Ryzen Embedded CPUs in ruggedized IPCs. IC Role / Device Role / Timing Role: Robust POL regulator with wide 2.7–16-V input range accommodating 12-V DC or PoE-derived supplies. Use Value: Supports cold-cranking (2.7-V min) and brownout immunity via VIN UVLO hysteresis (0.2 V) and external bias option. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS548A28RJER | 15-A rated; identical pinout and feature set except lower current capability and higher RDS(on) MOSFETs (9.5/3.1 mΩ) | Suitable for sub-15-A loads where thermal margin is constrained; not recommended for 20-A sustained operation | Select TPS548A28RJER only if output current requirement is ≤15 A and board layout reuse is critical |
| MP2964GQKT-Z | 20-A rating; uses constant-on-time control (not D-CAP3™); no integrated VCC LDO; requires external bias for gate drive | Better suited for cost-sensitive industrial designs where external bias is already available; lacks remote sense and hiccup OCP | Choose MP2964GQKT-Z when external 5-V bias is present and differential sensing is unnecessary |
Compared with TPS548B28RWWR, TPS548A28RJER offers pin-compatible downrating for lower-current nodes, while MP2964GQKT-Z trades integrated LDO and remote sense for lower BOM count in bias-rich systems - neither provides identical D-CAP3™ transient response or ±1% remote-sense accuracy.
Availability
TPS548B28RWWR is available at Aetrix Electronics and suitable for rack server, data center switch, and industrial PC applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS548B28RWWR 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.
The TPS548B28RWWR belongs to TI's D-CAP3™ synchronous buck converter family, engineered specifically for high-density, high-transient-response point-of-load regulation in cloud infrastructure and enterprise computing.
FAQ
What input voltage range does the TPS548B28RWWR support with and without external VCC bias?
The TPS548B28RWWR supports 2.7–16-V input when externally biased on the VCC pin (3.13–3.6 V), and 4.0–16-V input when using its internal 3-V LDO. Below 4 V, external bias is mandatory to ensure proper gate drive and internal circuit operation - verified in Section 6.3 Recommended Operating Conditions of the datasheet.
How is the current limit threshold programmed on the TPS548B28RWWR?
The TPS548B28RWWR uses the TRIP pin to set valley-current overcurrent limit via an external resistor (RTRIP) to AGND. With KOCL = 120 kA·Ω, a 5.23-kΩ resistor yields 22.9-A limit; values from 0–20 kΩ scale limit from 25–6 A. Resistor tolerance must be ±1% for accuracy - confirmed in Table 6-5 and Section 7.3.9.
Does the TPS548B28RWWR support prebiased start-up, and how is it enabled?
Yes, the TPS548B28RWWR supports prebiased start-up to safely power into an already charged output rail. It requires no additional configuration - the device automatically detects prebias condition and disables reverse current flow through the low-side MOSFET body diode during soft-start ramp, as documented in Section 7.3.10.
What is the purpose of the VSNS− and VOSNS+ pins on the TPS548B28RWWR?
The VSNS− and VOSNS+ pins implement differential remote voltage sensing to compensate for IR drop between the converter output and load. VSNS− serves as the return path for the feedback network and reference ground; VOSNS+ connects directly to the load point. This configuration maintains ±1% output accuracy over temperature and load - specified in Section 6.5 Electrical Characteristics.
Can the TPS548B28RWWR operate in forced continuous conduction mode (FCCM), and how is it selected?
Yes, the TPS548B28RWWR can operate in FCCM by grounding the MODE pin (0 Ω to AGND). This disables skip-mode and fixes switching frequency at 600 kHz, ensuring consistent EMI profile and minimal output voltage ripple during light-load conditions - detailed in Table 7-1 and Section 7.3.4.
TPS548B28RWWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 21-PowerVFQFN
- 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):
- 2.7V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 20A
- Frequency - Switching:
- 600kHz, 800kHz, 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 21-VQFN-HR (4x3)
TPS548B28RWWR FAQ
1.How can I place an order for TPS548B28RWWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS548B28RWWR 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 TPS548B28RWWR reliable?
The price and inventory of TPS548B28RWWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS548B28RWWR is usually 5 days.
3.What payment methods are accepted for TPS548B28RWWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS548B28RWWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS548B28RWWR?
TPS548B28RWWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS548B28RWWR 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 TPS548B28RWWR?
For technical support, including TPS548B28RWWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS548B28RWWR requirements.
6.How does Aetrix verify that TPS548B28RWWR is sourced from the original manufacturer or authorized distributors?
All TPS548B28RWWR 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 TPS548B28RWWR meets industry standards.
7.What is the process for return or replacement of TPS548B28RWWR?
All TPS548B28RWWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS548B28RWWR, 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 TPS548B28RWWR part is unused and in its original packaging.
Return procedure for TPS548B28RWWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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