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Texas Instruments TPS51385RJNR
- Part No.:
- TPS51385RJNR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
TPS51385RJNR.pdf
- Description:
- IC REG BUCK ADJ 7A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,748
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Product details
Overview
TPS51385RJNR from Texas Instruments is a monolithic 7-A synchronous buck converter with D-CAP3™ control, integrated 22-mΩ high-side and 11-mΩ low-side MOSFETs, 1-MHz switching frequency, ±1% reference accuracy at 25°C, and latched OVP/UVP protection. It delivers regulated 0.6–5.5-V output from 4.5–24-V input for notebook CPU core power rails.
For engineers reviewing the TPS51385RJNR datasheet, TPS51385RJNR pinout, TPS51385RJNR application, or TPS51385RJNR equivalent, key selection criteria include its adaptive on-time D-CAP3 topology for no-external-compensation design, selectable PSM/OOA light-load modes, internal 1-ms soft start, power-good indicator, and thermally enhanced 2.00-mm × 3.00-mm HotRod™ QFN package.
Technical Context
The TPS51385RJNR implements adaptive on-time D-CAP3™ control using internal ripple injection to enable fast transient response without external compensation components. Its control loop directly senses output voltage via FB and regulates using an accurate 0.6-V reference with ±1.5% tolerance over –40°C to 125°C.
It supports dual operating modes via the MODE pin: Power Save Mode (PSM) for highest light-load efficiency and Out-of-Audio™ (OOA) mode maintaining >25-kHz minimum switching frequency to eliminate audible noise. Protection includes latched OVP/UVP, non-latched UVLO/OTP, cycle-by-cycle OCP, and built-in output discharge via 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 | 7 A continuous - sufficient for CPU/GPU core supplies in ultrabooks and compact PCs. |
| Switching Frequency | 1 MHz - enables small external inductors and capacitors while balancing EMI and efficiency. |
| Reference Voltage Accuracy | ±1% at 25°C, ±1.5% over –40°C to 125°C - ensures tight output regulation across temperature for stable logic supply. |
| Quiescent Current | 84 µA - minimizes standby power loss in battery-powered systems extending runtime. |
| MOSFET RDS(on) | 22 mΩ (HS), 11 mΩ (LS) - reduces conduction losses and thermal stress at full load. |
| Protection Features | Latched OVP/UVP, non-latched UVLO/OTP, cycle-by-cycle OCP - provides robust fault coverage without requiring external supervision circuitry. |
Pinout & Package
TPS51385RJNR uses a thermally enhanced 12-pin VQFN-HR (HotRod™) package measuring 2.00 mm × 3.00 mm with exposed thermal pad. The package supports high-density PCB layouts and efficient heat dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply | Connects to 4.5–24-V source; requires local decoupling to PGND for stable gate drive and control bias. |
| PGND | Power ground | High-current return path for internal FETs; must be connected to PCB ground plane with low-inductance layout. |
| PG | Open-drain power-good indicator | Asserts low during soft-start, OVP/UVP, thermal shutdown, or EN disable; requires external 100-kΩ pull-up to VCC. |
| FB | Feedback input | Senses output voltage via resistor divider; sets regulated output as VOUT = 0.6 V × (1 + RUP/RLOW). |
| SS | Soft-start timing | Charged by 5-µA internal current; external capacitor extends soft-start beyond internal 1-ms default. |
| SW | Switch node | Connects to output inductor; carries high di/dt switching current; requires short, low-inductance trace. |
| VBST | Bootstrap supply | Supplies gate drive for high-side FET; requires 0.1-µF ceramic capacitor between VBST and SW. |
| VCC | Internal LDO output | 5-V regulated supply for internal circuitry; bypass with ≥1-µF X5R capacitor to AGND. |
| AGND | Analog ground | Reference for FB, SS, MODE, EN; connect to PGND at single point near AGND pin. |
| EN | Enable control | Digital input; >1.31 V enables converter, <1.13 V disables; internal pulldown when floating. |
| MODE | Operating mode select | Pull >0.8 V for OOA mode (>25 kHz light-load freq), pull <0.4 V or float for PSM; supports dynamic switching. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP3™ control mode | Enables fast transient response and stable regulation with no external compensation components, reducing BOM count and layout complexity. |
| Selectable PSM/OOA modes | OOA mode maintains >25-kHz switching under light load to eliminate audible coil whine; PSM maximizes efficiency below 100-mA load. |
| Integrated 22-mΩ/11-mΩ MOSFETs | Eliminates need for external power switches, simplifies thermal design, and improves efficiency at 7-A continuous output. |
| Latched OVP/UVP protection | Prevents damage from output faults by latching off until EN toggle or VIN cycle-no external fault latch required. |
| Built-in output discharge | 160-Ω internal switch actively discharges VOUT during fault conditions or shutdown, ensuring safe power sequencing. |
Applications
| Ultrabook Core Power | Notebook DDR Memory Supply |
|---|---|
Use Scenario: Regulating 1.2-V CPU core voltage from 12-V or 19.5-V adapter input in fanless ultrabooks with strict thermal and size constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 7-A peak current with fast load-step response to meet Intel IMVP-9 transient requirements. Use Value: D-CAP3™ control achieves sub-10-µs transient recovery without external compensation, enabling smaller output capacitance and lower system cost. | Use Scenario: Generating 1.2-V DDR4/DDR5 memory rail in thin-and-light notebooks where efficiency at light load impacts battery life. IC Role / Device Role / Timing Role: High-efficiency POL converter operating in PSM mode during memory idle states and transitioning to CCM during burst accesses. Use Value: 84-µA quiescent current and selectable PSM/OOA modes extend battery runtime while eliminating audible noise during video playback. |
| TV/STB SoC Core Supply | Point-of-Load for FPGA I/O Banks |
Use Scenario: Providing 0.85-V to 1.1-V core voltage for ARM-based SoCs in smart TVs and set-top boxes with 24-V input bus. IC Role / Device Role / Timing Role: Main SoC power rail converter supporting dynamic voltage scaling (DVS) and rapid load transients during video decode bursts. Use Value: ±1.5% reference accuracy over –40°C to 125°C ensures stable operation in unventilated enclosures with wide ambient swings. | Use Scenario: Delivering 1.8-V or 3.3-V I/O supply to FPGA banks in industrial edge controllers where board space and thermal headroom are limited. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator with integrated FETs and thermal protection for reliable field deployment. Use Value: 2.00-mm × 3.00-mm HotRod™ QFN package and non-latched OTP/UVLO enable robust operation in high-temperature environments without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51386RJNR | 8-A rating, identical pinout and feature set; higher current capability with same 22-mΩ/11-mΩ RDS(on). | Preferred for designs requiring >7-A peak current or future-proofing headroom without layout change. | Select TPS51386RJNR only if 8-A continuous output is required; otherwise TPS51385RJNR offers optimal cost/performance for 7-A use cases. |
| MP2315GJ-Z | Monolithic 6-A buck; 4.5–28-V input; 1.2-MHz fixed frequency; no OOA mode; ±2% reference accuracy. | Suitable for cost-sensitive consumer electronics where audible noise is not critical and tighter regulation is not required. | Choose MP2315GJ-Z for simpler, lower-cost designs accepting wider output tolerance and lacking advanced light-load modes. |
Compared with TPS51386RJNR, the TPS51385RJNR trades 1-A output capacity for optimized thermal performance in the same footprint; versus MP2315GJ-Z, it delivers superior regulation accuracy, OOA noise suppression, and integrated discharge functionality essential for computing applications.
Availability
TPS51385RJNR is available at Aetrix Electronics and suitable for notebook power delivery, ultrabook core regulation, and TV/STB point-of-load applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for TPS51385RJNR 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 TPS51385RJNR belongs to TI's D-CAP3™ family of adaptive on-time buck converters designed specifically for high-transient, space-constrained computing and consumer power applications demanding minimal external components and robust protection.
FAQ
What is the maximum continuous output current supported by the TPS51385RJNR?
The TPS51385RJNR supports 7-A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its integrated 22-mΩ high-side and 11-mΩ low-side MOSFETs enable this rating with typical efficiency >85% at 5.1-V output and 7-A load with 12-V input. Derating is required above 125°C junction temperature.
Does the TPS51385RJNR require external compensation components?
No, the TPS51385RJNR does not require external compensation components due to its D-CAP3™ control architecture. This proprietary adaptive on-time topology uses internal ripple injection to maintain stability with standard MLCC or POSCAP output capacitors, eliminating the need for external RC networks or type-II/type-III compensators typically required in voltage-mode or current-mode controllers.
How does the MODE pin affect light-load operation of the TPS51385RJNR?
The MODE pin on the TPS51385RJNR selects between two light-load operating modes: pulling it >0.8 V enables Out-of-Audio™ (OOA) mode, maintaining switching frequency >25 kHz to prevent audible noise; pulling it <0.4 V or leaving it floating selects Power Save Mode (PSM), which maximizes efficiency by skipping pulses. Both modes are dynamically switchable during operation without restarting the converter.
What protection features are implemented in the TPS51385RJNR?
The TPS51385RJNR integrates latched overvoltage (OVP) and undervoltage (UVP) protection, non-latched undervoltage lockout (UVLO) and overtemperature (OTP) protection, cycle-by-cycle overcurrent protection (OCP), and built-in output discharge. OVP/UVP faults latch off the device until EN is toggled or VIN is cycled, while UVLO/OTP reset automatically once the fault condition clears.
Can the TPS51385RJNR operate with ceramic output capacitors only?
Yes, the TPS51385RJNR is fully compatible with all-MLCC output capacitor configurations due to its D-CAP3™ control architecture, which uses internal ripple injection to synthesize the necessary AC signal for loop stability. Unlike traditional buck controllers, it does not require high-ESR capacitors or additional damping components, enabling compact, low-profile designs with ultra-low output ripple.
TPS51385RJNR 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:
- 7A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-VQFN-HR (3x2)
TPS51385RJNR FAQ
1.How can I place an order for TPS51385RJNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51385RJNR 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 TPS51385RJNR reliable?
The price and inventory of TPS51385RJNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51385RJNR is usually 5 days.
3.What payment methods are accepted for TPS51385RJNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51385RJNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51385RJNR?
TPS51385RJNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51385RJNR 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 TPS51385RJNR?
For technical support, including TPS51385RJNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51385RJNR requirements.
6.How does Aetrix verify that TPS51385RJNR is sourced from the original manufacturer or authorized distributors?
All TPS51385RJNR 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 TPS51385RJNR meets industry standards.
7.What is the process for return or replacement of TPS51385RJNR?
All TPS51385RJNR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51385RJNR, 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 TPS51385RJNR part is unused and in its original packaging.
Return procedure for TPS51385RJNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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