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Texas Instruments TPS51383RJNR
- Part No.:
- TPS51383RJNR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
TPS51383RJNR.pdf
- Description:
- IC REG BUCK 3.36V 8A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,083
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Product details
Overview
TPS51383RJNR from Texas Instruments is a monolithic 8-A synchronous buck converter with integrated 22-mΩ high-side and 11-mΩ low-side MOSFETs, delivering a fixed 3.36-V output and a 3.3-V/100-mA LDO with switch-over functionality. It operates from 4.5 V to 24 V input, supports D-CAP3™ adaptive on-time control for fast transient response, and features 80-μA quiescent current for extended battery life in notebook standby mode.
For engineers reviewing the TPS51383RJNR datasheet, TPS51383RJNR pinout, TPS51383RJNR application, or TPS51383RJNR equivalent, this device is selected for space-constrained, high-efficiency point-of-load regulation requiring accurate voltage tracking (±1% at 25°C), latched OV/UV protection, and seamless PSM/OOA light-load mode selection - critical for ultrabook CPU core rail and auxiliary power sequencing.
Technical Context
The TPS51383RJNR implements D-CAP3™ control with internal ripple injection, eliminating need for external compensation while supporting POSCAP and all-MLCC output capacitors. Its adaptive on-time architecture enables stable operation across wide VIN (4.5–24 V) and load (0–8 A) ranges, with automatic transition between CCM and DCM.
It integrates dual protection schemes: latched OV/UV fault detection (117–123% OVP, 55–65% UVP) and non-latched UVLO (4.2–4.42 V VCC threshold) and thermal shutdown (165°C). The MODE pin dynamically selects between Power Save Mode (PSM) and Out-of-Audio™ (OOA) mode, maintaining >25-kHz switching frequency under light load to avoid audible noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 24 V - supports wide-input industrial and notebook adapter rails without pre-regulation. |
| Output Voltage | Fixed 3.36 V ±1% at 25°C - precision reference enables direct powering of 3.3-V logic without external feedback divider. |
| Continuous Output Current | 8 A - delivered via integrated 22-mΩ/11-mΩ HotRod™ MOSFETs, enabling compact 2.0 × 3.0 mm layout with minimal thermal derating. |
| Quiescent Current | 80 μA - sustains ultra-low power draw during system standby, extending battery runtime in portable applications. |
| Switching Frequency | 600 kHz nominal - fixed frequency simplifies EMI filtering; OOA mode maintains ≥25 kHz under light load to avoid audible switching noise. |
| LDO Output | 3.3 V / 100 mA with switch-over - supplies always-on circuits (e.g., RTC, wake logic) and auto-transfers to main buck output when regulation is achieved. |
| Protection Features | Latched OV/UV, cycle-by-cycle OCP, output discharge (160 Ω), thermal shutdown (165°C) - ensures robust fault recovery in unattended systems. |
Pinout & Package
TPS51383RJNR uses a thermally enhanced 12-pin HotRod™ QFN package (RJN), measuring 2.00 mm × 3.00 mm with exposed thermal pad. The package supports high-density PCB layouts and efficient heat dissipation in thin-profile notebooks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply for control circuitry | Connects to bulk input capacitor; decoupling required between VIN and PGND for stable gate drive and bias generation. |
| PGND | Power ground for internal FETs | Low-impedance return path for high di/dt switching currents; must be tied to AGND at single point near AGND pin. |
| PG | Open-drain power-good indicator | Asserts low during soft-start, fault (OV/UV/TSD), or EN disable; requires 100-kΩ pull-up to VCC for system monitoring. |
| FB | Feedback input for output regulation | Directly senses VOUT at load; no external resistor divider needed due to fixed 3.36-V output configuration. |
| VOUT | Output voltage sense node | Connected to positive terminal of output capacitor closest to load; enables accurate remote sensing and transient response. |
| LDO | 100-mA 3.3-V auxiliary output | Powers standby circuits when EN = low but VIN > UVLO; bypassed with ≥4.7-μF X7R ceramic for stability during switch-over. |
| SW | Switch node | Connects to output inductor; high dv/dt node requiring tight layout and minimized loop area to reduce EMI. |
| VBST | Bootstrap supply for high-side gate drive | Requires bootstrap capacitor (typically 0.1 μF) between VBST and SW to sustain high-side FET conduction. |
| VCC | 5-V internal LDO output | Bypassed with 1-μF capacitor; powers internal logic and gate drivers; monitored by UVLO for safe startup/shutdown. |
| AGND | Analog ground reference | Ground for FB, PG, MODE, EN; must connect to PGND at single-point star ground near AGND pin to minimize noise coupling. |
| EN | Enable control input | Digital input with 1.31-V turn-on threshold; internal pulldown allows default-disable; pulled high to initiate soft-start. |
| MODE | Light-load operating mode select | Pull >0.8 V for OOA mode (≥25 kHz min freq); float or pull <0.4 V for PSM; supports dynamic toggling during operation. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP3™ adaptive on-time control | Enables fast load transient response (<10 µs recovery) without external compensation components or loop tuning. |
| Integrated 22-mΩ/11-mΩ MOSFETs | Reduces BOM count and board area; achieves >90% efficiency at 8-A load (VIN = 12 V) with minimal thermal rise. |
| Output discharge function | 160-Ω internal switch actively discharges VOUT during fault conditions (OV/UV/TSD), preventing residual voltage hazards. |
| Selectable PSM/OOA light-load modes | OOA mode maintains >25-kHz switching frequency to eliminate audible noise; PSM maximizes light-load efficiency down to 80-μA IQ. |
| 3.3-V/100-mA LDO with switch-over | Provides continuous auxiliary power during EN = low; automatically transfers to main buck output when VOUT reaches 98% of target. |
| Latched OV/UV and non-latched UVLO/TSD | Ensures system-level safety: latched faults require EN toggle or VIN cycle; non-latched protections enable automatic recovery after fault clears. |
Applications
| Ultrabook Core Rail | Notebook Standby Power |
|---|---|
Use Scenario: Powers CPU I/O or chipset core logic in thin-and-light notebooks requiring precise 3.36-V regulation and rapid load transients during burst-mode operation. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated power stage and D-CAP3™ control for direct core rail delivery. Use Value: Delivers 8-A peak current with ±1% accuracy and sub-10-µs transient recovery, eliminating need for external compensation or complex loop design. |
Use Scenario: Supplies always-on subsystems (RTC, keyboard controller, wake-on-LAN) during S3/S4 sleep states where main rail is disabled. IC Role / Device Role / Timing Role: Dual-function IC providing both main 3.36-V buck output and auxiliary 3.3-V LDO with seamless switch-over. Use Value: Maintains 3.3-V standby power with 100-mA capability even when EN = low, reducing system-level power sequencing complexity. |
| TV/STB Point-of-Load | Distributed Power System |
Use Scenario: Regulates 3.36-V supply for HDMI PHY, audio codec, or memory interface in smart TV and set-top box designs with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency POL converter with OOA mode ensuring switching remains above 25 kHz to avoid audible noise in living-room environments. Use Value: Achieves >85% efficiency at 100-mA load (VIN = 12 V) while suppressing acoustic noise - critical for consumer audio-visual equipment. |
Use Scenario: Provides scalable 3.36-V rail in multi-rail industrial controllers where space, thermal performance, and reliability are constrained. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC solution with latched fault protection and -40°C to 125°C junction rating. Use Value: Enables single-layer thermal pad mounting and supports long-term operation in sealed enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51384RJNR | Fixed 1.82-V output (vs. 3.36 V); identical pinout, package, and feature set including LDO switch-over and D-CAP3™ control. | Targets 1.8-V SoC core rails instead of 3.3-V I/O rails; not interchangeable without redesigning output capacitor and feedback network. | Select TPS51384RJNR only when 1.82-V output is required; shares same layout and thermal profile but differs in output voltage and LDO (1.8 V). |
| TPS54821RHLR | Adjustable output (0.6–16 V), 8-A, 500-kHz fixed-frequency PWM; no integrated LDO; requires external compensation; larger 4-mm × 4-mm QFN package. | Suitable for flexible voltage rails where programmability outweighs fixed-output simplicity; lacks switch-over LDO and OOA mode. | Choose TPS54821RHLR when output voltage must be adjusted post-design or when external compensation is acceptable for tighter regulation tolerance. |
Compared with TPS51383RJNR, TPS51384RJNR offers identical functionality at 1.82 V for core logic, while TPS54821RHLR provides adjustable output and higher design flexibility at the cost of added components and larger footprint - making TPS51383RJNR optimal for fixed 3.36-V, space-constrained, low-noise applications.
Availability
TPS51383RJNR is available at Aetrix Electronics and suitable for notebook computers, ultrabook power management, and TV/STB point-of-load applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS51383RJNR 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 ICs for computing, industrial, and consumer markets.
The TPS51383RJNR belongs to TI's high-density synchronous buck converter product line, designed specifically for space-constrained, high-efficiency point-of-load regulation in portable and audio-sensitive electronics.
FAQ
What is the output voltage accuracy of the TPS51383RJNR over temperature?
The TPS51383RJNR delivers ±1% reference voltage accuracy at 25°C and maintains ±1.5% accuracy across the full operating junction temperature range of –40°C to 125°C. This specification is confirmed in Section 6.5 of the SLUSEE8 datasheet under "VOUT Voltage (TPS51383)" test conditions, ensuring reliable 3.36-V regulation for sensitive I/O interfaces without external trimming.
Does the TPS51383RJNR require external compensation components?
No, the TPS51383RJNR does not require external compensation components due to its D-CAP3™ adaptive on-time control architecture. The internal ripple injection network and error amplifier provide inherent stability with POSCAP or all-MLCC output capacitors, as verified in Section 7.3.1 and Figure 7-1 of the SLUSEE8 datasheet.
How does the LDO switch-over function work in the TPS51383RJNR?
The TPS51383RJNR's 3.3-V/100-mA LDO remains active when EN = low but VIN > UVLO. Once the main buck output reaches 98% of 3.36 V and PGOOD asserts high, an internal MOSFET switches the LDO output to VOUT, reducing conduction loss. This behavior is documented in Section 7.3.7 and Figure 7-12 of the SLUSEE8 datasheet.
What protection features are latched versus non-latched in the TPS51383RJNR?
The TPS51383RJNR implements latched overvoltage (OVP) and undervoltage (UVP) protection - faults persist until EN is toggled or VIN is cycled. In contrast, UVLO and thermal shutdown (TSD) are non-latched: the device resumes operation automatically once VCC rises above threshold or die temperature falls below 165°C minus 20°C hysteresis, per Section 6.5 and 7.3.9 of SLUSEE8.
Can the TPS51383RJNR operate with only ceramic output capacitors?
Yes, the TPS51383RJNR is explicitly designed to support all-MLCC output capacitors thanks to its D-CAP3™ control mode and internal ripple injection. Section 1 and 7.3.1 of the SLUSEE8 datasheet confirm compatibility with ultra-low-ESR ceramics, eliminating need for electrolytic or polymer capacitors in compact designs.
TPS51383RJNR 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.36V
- Voltage - Output (Max):
- -
- 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)
TPS51383RJNR FAQ
1.How can I place an order for TPS51383RJNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51383RJNR 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 TPS51383RJNR reliable?
The price and inventory of TPS51383RJNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51383RJNR is usually 5 days.
3.What payment methods are accepted for TPS51383RJNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51383RJNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51383RJNR?
TPS51383RJNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51383RJNR 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 TPS51383RJNR?
For technical support, including TPS51383RJNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51383RJNR requirements.
6.How does Aetrix verify that TPS51383RJNR is sourced from the original manufacturer or authorized distributors?
All TPS51383RJNR 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 TPS51383RJNR meets industry standards.
7.What is the process for return or replacement of TPS51383RJNR?
All TPS51383RJNR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51383RJNR, 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 TPS51383RJNR part is unused and in its original packaging.
Return procedure for TPS51383RJNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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