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Texas Instruments TPS51386RJNR
- Part No.:
- TPS51386RJNR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
TPS51386RJNR.pdf
- Description:
- IC REG BUCK ADJ 8A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,008
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Product details
Overview
TPS51386RJNR from Texas Instruments is a monolithic 8-A synchronous buck converter with D-CAP3™ control, integrated 22-mΩ high-side and 11-mΩ low-side MOSFETs, 4.5–24-V input range, 0.6–5.5-V adjustable output, and latched OVP/UVP protection. It delivers stable point-of-load power in space-constrained notebook and ultrabook CPU/GPU core rails.
For engineers reviewing the TPS51386RJNR datasheet, TPS51386RJNR pinout, TPS51386RJNR application, or TPS51386RJNR equivalent, key selection criteria include its 600-kHz fixed-frequency operation, ±1% reference accuracy at 25°C, 84-μA quiescent current in PSM mode, Out-of-Audio™ (OOA) light-load capability, and thermally enhanced 2.00-mm × 3.00-mm HotRod™ QFN package.
Technical Context
The TPS51386RJNR implements adaptive on-time D-CAP3™ control with internal ripple injection, enabling fast transient response without external compensation while supporting both POSCAP and all-MLCC output capacitors. Its control loop maintains tight line and load regulation across –40°C to 125°C junction temperature.
It features dual operating modes selected via the MODE pin: Power Save Mode (PSM) for maximum light-load efficiency and Out-of-Audio™ (OOA) mode ensuring >25-kHz minimum switching frequency under all light-load conditions. Protection includes latched OVP/UVP, non-latched UVLO/OTP, cycle-by-cycle OCP, and built-in output discharge via a 160-Ω switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 24 V - supports wide-input industrial and computing power rails including 12-V and 19.5-V adapter inputs. |
| Output Current | 8 A continuous - sufficient for CPU/GPU core voltage rails in ultrabooks and compact PCs. |
| Switching Frequency | 600 kHz - enables compact magnetics and predictable EMI filtering design. |
| Reference Voltage Accuracy | ±1% at 25°C, ±1.5% over –40°C to 125°C - ensures precise output regulation for sensitive digital loads. |
| Quiescent Current | 84 μA in PSM mode - extends battery runtime in always-on system states. |
| MOSFET RDS(on) | 22 mΩ (HS), 11 mΩ (LS) - minimizes conduction loss and thermal rise at full load. |
| Soft Start | Internal 1-ms fixed + external capacitor programmable - prevents inrush current and enables controlled power-up sequencing. |
Pinout & Package
TPS51386RJNR is housed in a thermally enhanced 12-pin VQFN-HR (HotRod™) package measuring 2.00 mm × 3.00 mm with exposed thermal pad. The package supports high-power density layouts and efficient PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply for control circuitry | Connects to main DC input rail; requires local decoupling to PGND for noise immunity. |
| PGND | Power ground for internal FETs | High-current return path for switching node; must be connected to thermal pad and low-impedance ground plane. |
| PG | Open-drain power-good indicator | Asserts low during soft start, OVP/UVP, or thermal shutdown; requires external 100-kΩ pullup to VCC. |
| FB | Feedback voltage sense input | Regulates output via resistor divider; sets VOUT = 0.6 V × (1 + RUP/RLOW). |
| SS | Soft-start timing control | Charged by 5-μA internal current; external capacitor extends soft-start time beyond 1 ms. |
| SW | Switch node output | Connects to output inductor; carries high di/dt switching current; layout critical for EMI and efficiency. |
| VBST | Bootstrap supply for HS gate drive | Requires 0.1-μF ceramic capacitor between VBST and SW to sustain high-side FET turn-on. |
| VCC | 5-V internal LDO output | Powers internal logic and gate drivers; bypass with ≥1-μF X5R capacitor to AGND. |
| AGND | Analog ground reference | Must tie to PGND at single point near AGND pin to minimize noise coupling into feedback path. |
| EN | Enable control input | Digital enable with 1.31-V turn-on threshold; internal pulldown ensures default disable state. |
| MODE | PSM/OOA mode selection | Pull >0.8 V for OOA (>25 kHz light-load freq); float or <0.4 V for PSM; supports dynamic mode switching. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP3™ control topology | Enables zero-external-compensation design with fast transient response and stable operation using MLCC-only output filters. |
| Latched OVP/UVP protection | Prevents damage from fault conditions by locking output off until EN toggle or VIN cycle; 120% OVP and 60% UVP thresholds. |
| Built-in output discharge | 160-Ω internal switch actively discharges VOUT during faults, eliminating need for external bleed circuitry. |
| Thermally optimized HotRod™ QFN | 2.00-mm × 3.00-mm footprint with exposed thermal pad achieves 37.2°C/W θJA on JEDEC board, enabling 8-A operation without heatsink. |
| On-the-fly mode switching | MODE pin can be toggled dynamically during operation to transition between PSM and OOA without restart or output disturbance. |
Applications
| Ultrabook Core Rail | Notebook GPU Supply |
|---|---|
Use Scenario: Powering Intel Core i5/i7 processor core voltage (VCCIN) in fanless ultrabooks with strict thermal and size constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 0.8–1.3-V output at up to 8 A with sub-100-μs load transient response. Use Value: D-CAP3™ control eliminates compensation components, reducing BOM count and PCB area while maintaining ±1% output accuracy across temperature. | Use Scenario: Supplying discrete or integrated GPU core voltage in thin-and-light notebooks requiring quiet operation and extended battery life. IC Role / Device Role / Timing Role: High-efficiency POL converter operating in OOA mode to suppress audible coil whine during video playback or idle states. Use Value: >25-kHz minimum switching frequency in OOA mode eliminates acoustic noise, while 84-μA quiescent current extends standby battery duration. |
| TV/STB SoC Core | Distributed POL System |
Use Scenario: Generating 1.1-V or 1.2-V core supply for ARM-based SoCs in smart TVs and set-top boxes with multi-rail power architecture. IC Role / Device Role / Timing Role: Secondary buck stage downstream of intermediate bus, supporting dynamic voltage scaling (DVS) via FB resistor network reconfiguration. Use Value: Adjustable soft start and precise 0.6-V reference enable clean power sequencing and stable low-voltage regulation under varying SoC load profiles. | Use Scenario: Local 5.1-V POL conversion in distributed power systems where centralized 12-V or 24-V bus feeds multiple point-of-load regulators. IC Role / Device Role / Timing Role: Compact, self-contained buck module delivering 8-A output with integrated FETs and protection, minimizing external component count per rail. Use Value: Integrated 22-mΩ/11-mΩ MOSFETs and 600-kHz switching reduce total solution size and improve efficiency over discrete controller+FET designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51363RGET | 4.5–24-V input, 6-A output, 600-kHz, same D-CAP3™ control but lower current rating and no latched UVP. | Suitable for lower-current SoC rails where 6-A headroom suffices; lacks latched undervoltage lockout. | Select when cost-sensitive designs tolerate reduced current capability and simplified protection. |
| ISL95831IRZ-T | 4.5–24-V input, 8-A output, 500-kHz, Intersil proprietary control, no OOA mode, different pinout and soft-start implementation. | Used in legacy laptop platforms; requires redesign for MODE/SS/PG signal routing and lacks audible-noise suppression. | Choose only for drop-in replacement in existing ISL95831-based designs; not recommended for new designs due to missing OOA and higher EMI risk. |
Compared with TPS51386RJNR, TPS51363RGET offers lower cost and identical control architecture but sacrifices 2-A current capacity and latched UVP; ISL95831IRZ-T provides similar current but lacks OOA mode and requires PCB layout changes due to incompatible pin mapping and protection behavior.
Availability
TPS51386RJNR is available at Aetrix Electronics and suitable for notebook computers, ultrabook core rails, and TV/STB point-of-load applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS51386RJNR 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The TPS51386RJNR belongs to TI's D-CAP3™ family of high-density synchronous buck converters, engineered specifically for space-constrained, high-efficiency computing and consumer electronics power rails demanding fast transient response and ultra-low quiescent current.
FAQ
What is the maximum continuous output current supported by the TPS51386RJNR?
The TPS51386RJNR supports 8-A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). This rating assumes use of the 2.00-mm × 3.00-mm HotRod™ QFN package with adequate copper pour and thermal vias to maintain junction temperature within limits. Derating applies above 85°C ambient.
Does the TPS51386RJNR require external compensation components?
No, the TPS51386RJNR uses D-CAP3™ control with internal ripple injection, eliminating the need for external compensation components such as type-II or type-III networks. This simplifies design, reduces BOM count, and ensures stability with common MLCC or POSCAP output capacitors without iterative loop tuning.
How does the MODE pin affect light-load efficiency and noise in the TPS51386RJNR?
The MODE pin selects between Power Save Mode (PSM) for peak light-load efficiency and Out-of-Audio™ (OOA) mode to force switching frequency above 25 kHz, eliminating audible coil whine. In OOA mode, the TPS51386RJNR maintains >25-kHz operation even at no load, while PSM allows frequency foldback to improve efficiency at microamp loads.
What protection features are latched versus non-latched in the TPS51386RJNR?
The TPS51386RJNR implements latched protection for output overvoltage (OVP) and undervoltage (UVP), requiring EN pin toggle or VIN power cycle to reset. Non-latched protections include UVLO (on VCC), thermal shutdown (TSD), and cycle-by-cycle overcurrent (OCP), which automatically recover when the fault condition clears.
Can the TPS51386RJNR operate with only ceramic output capacitors?
Yes, the TPS51386RJNR is explicitly designed to support all-MLCC output capacitor configurations thanks to its D-CAP3™ control with internal ripple injection. Unlike traditional voltage-mode or current-mode controllers, it does not rely on capacitor ESR for loop stability, enabling use of ultra-low-ESR ceramic capacitors for minimal size and optimal transient response.
TPS51386RJNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-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):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 8A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-VQFN-HR (3x2)
TPS51386RJNR FAQ
1.How can I place an order for TPS51386RJNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51386RJNR 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 TPS51386RJNR reliable?
The price and inventory of TPS51386RJNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51386RJNR is usually 5 days.
3.What payment methods are accepted for TPS51386RJNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51386RJNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51386RJNR?
TPS51386RJNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51386RJNR 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 TPS51386RJNR?
For technical support, including TPS51386RJNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51386RJNR requirements.
6.How does Aetrix verify that TPS51386RJNR is sourced from the original manufacturer or authorized distributors?
All TPS51386RJNR 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 TPS51386RJNR meets industry standards.
7.What is the process for return or replacement of TPS51386RJNR?
All TPS51386RJNR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51386RJNR, 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 TPS51386RJNR part is unused and in its original packaging.
Return procedure for TPS51386RJNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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