TPS51678RSMR Texas Instruments (HVQCCN) In Stock
TPS51678RSMR is a single-output D-CAP3 synchronous buck controller by Texas Instruments. Key specs: 4.5 V to 28 V input voltage, 32-pin VQFN package, fast transient response for point-of-load regulation. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Pin Count
- 32
- Lifecycle
- ACTIVE
- Datasheet
- TPS51678RSMR Datasheet PDF
- Price
- From $2.8700(MOQ 3000)
- Temp Range
- -40.0°C to 105.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- D-CAP3 constant-on-time control delivers fast load transient response with minimal output capacitance compared with traditional voltage-mode controllers
- Wide 4.5 V to 28 V input voltage range covers 5 V, 12 V, and 19 V input rails common in notebook and embedded computing platforms
- Compact 32-pin S-PQCC-N32 VQFN package supports high-density, space-constrained DC-DC converter layouts
Applications
TPS51678RSMR targets point-of-load DC-DC converters in notebook computers, tablets, and server blades where fast transient response to CPU and GPU load steps is critical. Its 4.5 V to 28 V input range accommodates both 12 V server bus and 19 V laptop adapter inputs in a single design. The device also fits industrial embedded computing boards that require a compact, low-BOM single-phase buck controller with adaptive on-time control.
Specifications
| Pbfree Code | Yes |
| Date Of Intro | 2019-07-23 |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Input Voltage-Max | 28V |
| Input Voltage-Min | 4.5V |
| JESD-30 Code | S-PQCC-N32 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 40A |
| Output Voltage-Max | 2.3V |
| Output Voltage-Min | 0.5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Surface Mount | YES |
| Switching Frequency-Max | 1500kHz |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.4mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Philippines |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does TPS51678RSMR support and which power rails is it designed for?
TPS51678RSMR supports an input voltage range of 4.5 V to 28 V, covering standard 5 V USB power, 12 V ATX and server bus, and 19 V laptop adapter rails. This wide range allows a single PCB design to source power from multiple adapter types without changing the controller, reducing design variants and qualification effort in notebook and embedded computing applications.
How does TPS51678RSMR's D-CAP3 control improve load transient performance compared with classical voltage-mode PWM controllers?
D-CAP3 constant-on-time architecture eliminates the multi-pole compensation network required by voltage-mode PWM designs, allowing TPS51678RSMR to respond to load steps within 1–2 switching cycles instead of the 5–10 cycles typical of compensated voltage-mode loops. This results in smaller output capacitor banks — often 30–50% fewer bulk capacitors — while still meeting ±3% output voltage accuracy requirements for modern SoC power rails.
Which competing single-phase buck controller is TPS51678RSMR most often benchmarked against, and how do they differ?
TPS51678RSMR is frequently compared with TPS51916 and Renesas ISL95831 in notebook platform designs. TPS51678RSMR differentiates itself with a 28 V maximum input versus the 21 V rating of TPS51916, enabling use on 24 V industrial rails. Its 32-pin VQFN footprint of approximately 5 mm x 5 mm is comparable to ISL95831 but integrates more telemetry features in a smaller die area.
What PCB layout considerations apply to TPS51678RSMR's 32-pin VQFN package?
The S-PQCC-N32 VQFN-32 package requires a thermal-pad via array on the PCB to dissipate heat from the controller under sustained 28 V input, high-frequency switching operation. Power and signal ground planes should be separated and joined at a single star point under the thermal pad to prevent high-frequency switching noise from coupling into the feedback sense lines. Bypass capacitors of at least 100 nF per power supply pin should be placed within 0.5 mm of the package edge.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 3000+ | $2.8700 | $8610.00 |
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