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Texas Instruments TPS51315RGFT
- Part No.:
- TPS51315RGFT
- Manufacturer:
- Texas Instruments
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
TPS51315RGFT.pdf
- Description:
- IC REG BUCK ADJ 10A 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
TPS51315RGFT from Texas Instruments is a D-CAP™ mode, 10-A synchronous step-down DC/DC converter with integrated high- and low-side MOSFETs (RDS(on) = 19 mΩ / 7 mΩ), supporting 3 V to 14 V input and adjustable 0.75 V to 5.5 V output. It delivers fast transient response for notebook CPU core power, features programmable 100 kHz–1 MHz switching frequency via external resistor on TON pin, and includes integrated boost diode and power-good signaling.
For engineers reviewing the TPS51315RGFT datasheet, TPS51315RGFT pinout, TPS51315RGFT application, or TPS51315RGFT equivalent, key selection considerations include its D-CAP™ adaptive on-time control, selectable Auto-Skip vs. PWM-only operation, internal soft-start (1.06 ms), <1% initial VFB accuracy, and thermal shutdown at 160°C with 12°C hysteresis.
Technical Context
The TPS51315RGFT implements D-CAP™ adaptive on-time control-feeding forward VIN and VOUT to determine on-time without an oscillator-enabling pseudo-constant frequency operation and fast load-transient response. Its cycle-by-cycle overcurrent protection monitors inductor current via the 7 mΩ lower FET RDS(on), with trip threshold set by external resistor on TRIP pin.
It supports prebias start-up and configurable output discharge via VOUT_DS pin (20 Ω internal switch), integrates a 5-V gate driver supply (V5IN) with internal boost diode (VBST), and provides dual-mode light-load efficiency: Auto-Skip enables discontinuous conduction at light loads, while PWM-only maintains fixed frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 14 V - supports wide-input industrial and computing rails including 5 V, 12 V, and 13.3 V battery inputs. |
| Output Current | 10 A continuous - sufficient for modern CPU/GPU core voltage regulation with margin. |
| Output Voltage Range | 0.75 V to 5.5 V - programmable via external resistor divider; 751 mV nominal VFB reference enables precise low-voltage regulation. |
| Switching Frequency | 100 kHz to 1 MHz - externally adjustable via resistor from TON to LL; enables optimization of size vs. efficiency tradeoff. |
| RDS(on) Upper/Lower | 19 mΩ / 7 mΩ - low conduction loss enables high efficiency at full load; lower FET used for current sensing. |
| Shutdown Current | < 5 μA - ultra-low quiescent consumption during system sleep states. |
| Power-Good Accuracy | ±5% window with 64 μs delay - ensures reliable sequencing and fault detection in multi-rail systems. |
Pinout & Package
TPS51315RGFT is housed in a thermally enhanced 40-pin QFN package (RGF), 5 mm × 7 mm, with exposed thermal pad. Pin count and layout match TI's UDG-08154 mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN_PSV (Pin 34) | Enable / Power-save logic input | Ground disables SMPS; 3.3 V/5 V enables Auto-Skip; float enables PWM-only mode. |
| TON (Pin 35) | On-time / frequency programming | Resistor to LL sets switching frequency (100 kHz–1 MHz); determines adaptive on-time scaling. |
| TRIP (Pin 32) | Overcurrent limit threshold | External resistor to GND sets valley inductor current trip point for cycle-by-cycle OCL. |
| VFB (Pin 39) | Feedback input | Monitors resistor-divider output; 751 mV reference enables accurate output voltage regulation. |
| VOUT_DS (Pin 37) | Output discharge control | Drives internal 20 Ω discharge FET; supports prebias start-up and fault-triggered discharge. |
| PGOOD (Pin 40) | Open-drain status output | Signals valid output within ±5%; requires external pull-up to 5 V rail; sink capability 7.5 mA. |
| LL (Pin 22) | Switch-node connection | Connects to inductor; used as switching node monitor for adaptive on-time calculation and VBST charging. |
| VBST (Pin 30) | High-side gate driver boost supply | Charged via internal diode from V5IN; capacitor to LL enables high-side FET drive above VIN. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP™ adaptive on-time control | Eliminates external compensation components; achieves <10 μs load-step response with ceramic output capacitors. |
| Integrated power MOSFETs | 19 mΩ upper + 7 mΩ lower FETs reduce BOM count and PCB area; enable 10-A continuous output without external switches. |
| Selectable light-load modes | Auto-Skip reduces switching frequency under light load; PWM-only maintains fixed frequency for noise-sensitive applications. |
| Programmable overcurrent limit | TRIP pin allows precise setting of OCL threshold (30–120 mV range) to match inductor saturation current. |
| Integrated output discharge | VOUT_DS pin controls internal 20 Ω discharge path; eliminates need for external discharge circuitry in prebias or fault conditions. |
Applications
| Mobile CPU Core Power | Notebook System Rail |
|---|---|
Use Scenario: Regulating 1.05 V or 1.2 V core voltage for Intel Core i-series or AMD Ryzen mobile processors under dynamic load transients up to 10 A. IC Role / Device Role / Timing Role: Primary synchronous buck controller with D-CAP™ loop; manages high di/dt load steps via adaptive on-time and integrated FETs. Use Value: Delivers sub-10 μs transient response and >90% peak efficiency at 12 V input, enabling compact, fanless thermal design. | Use Scenario: Generating stable 3.3 V or 5 V auxiliary rails for chipset, memory I/O, or USB controllers in ultrabook platforms. IC Role / Device Role / Timing Role: Secondary buck regulator with PGOOD sequencing and UVLO monitoring for system-level power management. Use Value: Integrated V5IN/V5FILT supplies and 5 μA shutdown current support deep-sleep states (S3/S5) without external LDOs. |
| Server VRM Sub-Module | Industrial Embedded Computing |
Use Scenario: Serving as a scalable, discrete-phase buck stage in multi-phase VRMs for Xeon E3/E5 server CPUs where single-phase 10-A capacity suffices. IC Role / Device Role / Timing Role: Standalone phase controller with thermal shutdown (160°C) and OVP/UVP protection for robust operation in dense board layouts. Use Value: Exposed thermal pad and 1.35 W power rating at 85°C ambient allow direct heatsink attachment or copper pour cooling. | Use Scenario: Powering FPGA or SoC cores in ruggedized edge AI gateways operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with –40°C to 125°C junction rating, integrated protections (OVP/UVP/thermal), and RoHS-compliant QFN packaging. Use Value: Eliminates external gate drivers and bootstrap diodes; reduces failure points in long-lifecycle industrial deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51317RGFT | Same 40-pin QFN package and pinout; supports higher 15-A output with 13 mΩ/5 mΩ RDS(on); identical D-CAP™ architecture and feature set. | Targeted for higher-current CPU cores requiring >10 A; shares same layout footprint but needs updated inductor/capacitor sizing. | Choose TPS51317RGFT when output current demand exceeds 10 A and thermal headroom permits higher power dissipation. |
| ISL95831IRZ | 10-A buck controller with integrated FETs; uses voltage-mode control (not D-CAP™); requires external compensation; 3.3 V to 24 V input range. | Better suited for wide-input industrial rails (e.g., 24 V PoE systems); lacks Auto-Skip mode and integrated V5IN/VBST diode. | Prefer ISL95831IRZ when input voltage exceeds 14 V or when voltage-mode loop tuning is required for EMI-sensitive environments. |
Compared with TPS51315RGFT, TPS51317RGFT offers higher current capacity in identical packaging, while ISL95831IRZ extends input voltage range at the cost of added external components and reduced light-load efficiency control.
Availability
TPS51315RGFT is available at Aetrix Electronics and suitable for notebook computing, server VRM sub-modules, and industrial embedded power applications requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for TPS51315RGFT 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 TPS51315RGFT belongs to TI's D-CAP™ synchronous buck converter product line, engineered specifically for fast-transient, high-density CPU/GPU core power in portable and computing systems.
FAQ
What is the recommended input voltage range for stable operation of the TPS51315RGFT?
The TPS51315RGFT operates reliably across an input voltage range of 3 V to 14 V, with absolute maximum ratings up to 20 V on VIN. For optimal efficiency and thermal performance, use 5 V or 12 V nominal inputs. Operation below 3 V may cause UVLO activation, while sustained voltages above 14 V risk exceeding recommended conditions and reducing reliability.
How does the TPS51315RGFT achieve fast transient response without external compensation?
The TPS51315RGFT achieves fast transient response using TI's proprietary D-CAP™ adaptive on-time control architecture. It directly senses the switching node (LL) and output voltage (VOUT) to dynamically adjust on-time per cycle-eliminating the need for external Type II/III compensation networks. This enables sub-10 μs load-step recovery with only ceramic output capacitors.
Can the TPS51315RGFT support prebias start-up, and how is it configured?
Yes, the TPS51315RGFT supports prebias start-up via the VOUT_DS pin. When EN_PSV is asserted while VOUT is already biased, the internal 20 Ω discharge FET remains off, preventing reverse current flow. No additional configuration is needed-the function is inherent to the VOUT_DS pin behavior and is confirmed in the SLUS881B datasheet Figure 19–22 waveforms.
What is the purpose of the TRIP pin on the TPS51315RGFT, and how is it used?
The TRIP pin on the TPS51315RGFT sets the overcurrent limit threshold by connecting an external resistor to ground. The internal current source (10 μA typical) develops a voltage across this resistor, which is compared against the lower FET's RDS(on)-based current sense signal. A 6 kΩ resistor yields ~60 mV trip, corresponding to ~8.6 A valley current with 7 mΩ RDS(on).
Does the TPS51315RGFT require an external bootstrap diode, or is it integrated?
The TPS51315RGFT integrates a PN diode between V5IN and VBST, eliminating the need for an external bootstrap diode in most designs. However, if forward voltage drop is critical for high-efficiency operation at low duty cycles, TI recommends adding an external Schottky diode from V5IN to VBST-as noted in the PIN DESCRIPTIONS section of the SLUS881B datasheet.
TPS51315RGFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP™
- Package/Case:
- 40-VFQFN Exposed Pad
- 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):
- 3V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 0.75V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 10A
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VQFN (7x5)
TPS51315RGFT FAQ
1.How can I place an order for TPS51315RGFT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51315RGFT 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 TPS51315RGFT reliable?
The price and inventory of TPS51315RGFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51315RGFT is usually 5 days.
3.What payment methods are accepted for TPS51315RGFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51315RGFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51315RGFT?
TPS51315RGFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51315RGFT 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 TPS51315RGFT?
For technical support, including TPS51315RGFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51315RGFT requirements.
6.How does Aetrix verify that TPS51315RGFT is sourced from the original manufacturer or authorized distributors?
All TPS51315RGFT 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 TPS51315RGFT meets industry standards.
7.What is the process for return or replacement of TPS51315RGFT?
All TPS51315RGFT units undergo pre-shipment inspection (PSI). If there is an issue with TPS51315RGFT, 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 TPS51315RGFT part is unused and in its original packaging.
Return procedure for TPS51315RGFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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