My Inquiry
My Account
Texas Instruments TPS51315RGFR
- Part No.:
- TPS51315RGFR
- Manufacturer:
- Texas Instruments
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
TPS51315RGFR.pdf
- Description:
- IC REG BUCK ADJ 10A 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,739
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS51315RGFR 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 rails and features programmable 100 kHz–1 MHz switching frequency via external resistor on TON pin.
For engineers reviewing the TPS51315RGFR datasheet, TPS51315RGFR pinout, TPS51315RGFR application, or TPS51315RGFR equivalent, key selection criteria include its integrated power stage, D-CAP™ adaptive on-time control, selectable Auto-Skip vs PWM-only operation, <1% initial VFB accuracy, and thermal shutdown at 160°C - all in a 40-pin 5 mm × 7 mm QFN package with exposed thermal pad.
Technical Context
The TPS51315RGFR implements D-CAP™ mode control using adaptive on-time regulation, where on-time is inversely proportional to VIN and proportional to VOUT to maintain pseudo-constant frequency across input voltage variations. It monitors the switching node (LL) during ON-state to inherently compensate for high-side FET conduction loss.
Its protection architecture includes cycle-by-cycle overcurrent limit set via TRIP pin (30–120 mV range), undervoltage/overvoltage protection on VFB (±5% PGOOD window, ±10% UVP/OVP thresholds), and thermal shutdown with 12°C hysteresis. The device supports prebias start-up and configurable output discharge via VOUT_DS pin with internal 20 Ω discharge switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 14 V - supports wide-input industrial and computing power rails including 5 V, 12 V, and 19 V adapter inputs. |
| Output Current | 10 A continuous - enables single-chip core power delivery for mid-tier CPUs and SoCs without external power stages. |
| Output Voltage Range | 0.75 V to 5.5 V - covers DDR memory, GPU cores, and I/O supply requirements via external R1/R2 divider. |
| VFB Regulation Accuracy | ±0.9% at 25°C - ensures tight output regulation critical for low-voltage digital loads with narrow tolerance windows. |
| Switching Frequency | 100 kHz to 1 MHz (externally set) - allows trade-off between inductor size (lower f) and efficiency/noise (higher f). |
| Shutdown Current | <5 μA - minimizes battery drain in portable systems during suspend or off states. |
| Package | 40-pin QFN (RGF), 5 mm × 7 mm, exposed thermal pad - provides low thermal resistance (25 mW/°C derating) for high-power density layouts. |
Pinout & Package
TPS51315RGFR is housed in a thermally enhanced 40-pin plastic QFN (RGF) package measuring 5 mm × 7 mm with an exposed thermal pad. Pin numbering follows standard top-view layout per TI SLUS881B.
| 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 mode; floating enables forced PWM-only operation. |
| TON (Pin 35) | Frequency programming input | Connects to LL via resistor to set switching frequency from 100 kHz to 1 MHz with ±10% tolerance. |
| TRIP (Pin 32) | Overcurrent threshold setting | Resistor-to-GND sets valley current trip point (30–120 mV); determines OCL threshold for 10-A output stage. |
| VFB (Pin 39) | Feedback voltage input | Monitors resistor divider output; regulates VOUT to precise 0.75 V reference with ±1.6% tolerance over –40°C to 85°C. |
| PGOOD (Pin 40) | Open-drain power-good output | Signals valid output after soft-start (64 μs delay) when VOUT is within ±5% of target; sinks up to 7.5 mA. |
| VOUT_DS (Pin 37) | Output discharge control | Enables internal 20 Ω discharge path to PGND during shutdown or fault; supports prebias start-up when left open. |
| LL (Pins 22, 23, 24, 25, 26, 27, 28, 29) | Switching node / low-side source | Common connection point for inductor, low-side FET source, and high-side FET drain; used for adaptive on-time sensing. |
| PGND (Pins 7, 16–21, 23–29) | Power ground return | Dedicated low-impedance return path for high-current switching loop; separate from signal GND (Pins 2, 4) to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP™ adaptive on-time control | Eliminates external compensation components and enables fast load-transient response (<10 μs recovery) with ceramic output capacitors. |
| Integrated dual MOSFET power stage | 19 mΩ high-side + 7 mΩ low-side RDS(on) reduces conduction loss and simplifies PCB layout versus discrete solutions. |
| Selectable light-load operation | Auto-Skip mode reduces switching frequency under light load to maintain >85% efficiency down to 10 mA; PWM-only mode ensures constant frequency. |
| Programmable overcurrent limit | External resistor on TRIP pin sets OCL threshold independently of output voltage, enabling robust current limiting across full VOUT range. |
| Integrated boost diode and soft-start | Internal V5IN-to-VBST PN diode eliminates external bootstrap diode; 1.06-ms internal soft-start prevents inrush current and output overshoot. |
Applications
| Mobile CPU Core Power | Notebook System Rail |
|---|---|
Use Scenario: Powers Intel Core i3/i5 processor core (VCCIN) in ultrabook platforms with dynamic load steps from 0.5 A to 8 A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 1.05 V ±1% with D-CAP™ transient response. Use Value: Achieves <100 mV undershoot/overshoot during 4-A/μs load transients due to adaptive on-time control and integrated FETs. | Use Scenario: Supplies DDR3/DDR4 memory termination voltage (VTT) and SOC I/O rail (1.8 V/3.3 V) in dual-buck configurations. IC Role / Device Role / Timing Role: Secondary buck converter operating in PWM-only mode to ensure stable clock-domain timing margins. Use Value: Maintains ±0.5% output stability across –40°C to 85°C ambient using <1% VFB reference and thermal shutdown at 160°C. |
| Server Baseboard Management | Industrial Embedded Controller |
Use Scenario: Generates 1.2 V FPGA core voltage on server management controllers with strict 50-ms power-up sequencing. IC Role / Device Role / Timing Role: Sequenced power rail with PGOOD assertion (64 μs delay) and UVLO lockout on V5FILT (3.7 V threshold). Use Value: Ensures reliable boot by disabling output until input stabilizes and confirming regulation before releasing downstream reset. | Use Scenario: Powers ARM Cortex-A9-based PLC CPU in fanless industrial enclosures with limited airflow. IC Role / Device Role / Timing Role: High-efficiency 10-A buck converter operating in Auto-Skip mode to minimize self-heating at partial load. Use Value: Use Value: Delivers >92% peak efficiency at 5 A/12 VIN/1.2 VOUT, reducing thermal design burden in sealed chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51317RGFR | Same 40-pin QFN package and pinout; supports higher 15-A output with 12 mΩ/5 mΩ RDS(on); requires larger input capacitance. | Targeted at higher-power CPU cores (e.g., Core i7) requiring >12 A; not drop-in for 10-A designs due to different current-sense scaling. | Select TPS51317RGFR only if board layout accommodates increased thermal mass and revised TRIP resistor value. |
| ISL95831IRZ | 10-A buck with similar D-CAP-like Adaptive On-Time control; 32-pin 5 mm × 5 mm QFN; no integrated V5IN/VBST diode - requires external bootstrap diode. | Used in legacy Intel mobile platforms; lacks VOUT_DS discharge function and has fixed 300 kHz frequency - less flexible for noise-sensitive applications. | Choose ISL95831IRZ only when footprint reduction is prioritized over design flexibility and integrated discharge capability. |
Compared with TPS51315RGFR, TPS51317RGFR offers higher current capacity but demands revised thermal and current-sense design, while ISL95831IRZ reduces package size at the cost of added external components and fixed frequency - making TPS51315RGFR optimal for balanced performance, integration, and layout simplicity in 10-A notebook/server rails.
Availability
TPS51315RGFR is available at Aetrix Electronics and suitable for notebook computer power delivery, server baseboard management, and industrial embedded controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS51315RGFR 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 TPS51315RGFR belongs to TI's D-CAP™ synchronous buck converter product line, engineered specifically for fast-transient, high-current CPU and SoC core power in space-constrained portable and computing systems.
FAQ
What is the maximum recommended input voltage for the TPS51315RGFR?
The absolute maximum input voltage (VIN) for the TPS51315RGFR is 20 V, but the recommended operating range is 3 V to 14 V per TI SLUS881B. Exceeding 14 V may compromise reliability and thermal performance, especially at high ambient temperatures. The device includes overvoltage protection that shuts down the upper FET if VOUT exceeds 5.75 V, but sustained VIN >14 V risks overstressing internal gate drivers and the V5IN supply circuitry. Always operate within the 3–14 V range for guaranteed specification compliance.
Does the TPS51315RGFR support prebias start-up?
Yes, the TPS51315RGFR supports prebias start-up via the VOUT_DS pin. When EN_PSV is asserted while VOUT is already biased (e.g., from another rail), the internal discharge MOSFET remains off, preventing reverse current flow. This avoids output voltage collapse and enables safe hot-plug or multi-rail sequencing. The feature is enabled by default - no external components are required unless controlled discharge is needed, in which case a resistor between VOUT_DS and VOUT sets the discharge rate. Prebias behavior is confirmed in the functional block diagram and detailed description sections of the TPS51315RGFR datasheet.
How is the switching frequency programmed on the TPS51315RGFR?
The switching frequency of the TPS51315RGFR is programmed by connecting an external resistor (RT(on)) between the TON pin (Pin 35) and the LL node (switching node). The nominal on-time is set to 1115 ns at VIN = 10 V and VOUT = 2.5 V with RT(on) = 250 kΩ, yielding ~300 kHz. Frequency scales inversely with RT(on): 100 kΩ gives ~600 kHz, and 400 kΩ gives ~180 kHz. The relationship is defined in Equation 3 of the TPS51315RGFR datasheet, and RT(on) must be selected within 100 kΩ–400 kΩ to ensure stable operation across input/output conditions.
What protection features are integrated into the TPS51315RGFR?
The TPS51315RGFR integrates six key protections: (1) Cycle-by-cycle overcurrent limit (OCL) set via TRIP pin; (2) Undervoltage/overvoltage protection (UVP/OVP) on VFB with ±10% thresholds; (3) Thermal shutdown at 160°C with 12°C hysteresis; (4) V5FILT undervoltage lockout (UVLO) at 3.7 V; (5) Input overvoltage detection (>5.75 V on VOUT); and (6) Output discharge during fault or shutdown via VOUT_DS. All protections are active without external components, and latch-free faults (e.g., thermal, UVLO) auto-recover when conditions normalize - critical for robust notebook and server power systems.
Can the TPS51315RGFR use all-ceramic output capacitors?
Yes, the TPS51315RGFR fully supports all-ceramic output capacitors thanks to its D-CAP™ control architecture, which does not require minimum ESR for loop stability. The datasheet explicitly states "Supports All Ceramic Output Capacitors" in the FEATURES section and confirms this in the APPLICATION INFORMATION chapter. Using low-ESR ceramics (e.g., X5R/X7R 10–47 μF) reduces board area, improves transient response, and eliminates electrolytic capacitor aging concerns - verified in TI's typical efficiency and load-step waveforms (Figures 23–24) where ceramic-only output networks achieve <100 mV deviation under 4-A/μs steps.
TPS51315RGFR 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)
TPS51315RGFR FAQ
1.How can I place an order for TPS51315RGFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51315RGFR 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 TPS51315RGFR reliable?
The price and inventory of TPS51315RGFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51315RGFR is usually 5 days.
3.What payment methods are accepted for TPS51315RGFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51315RGFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51315RGFR?
TPS51315RGFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51315RGFR 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 TPS51315RGFR?
For technical support, including TPS51315RGFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51315RGFR requirements.
6.How does Aetrix verify that TPS51315RGFR is sourced from the original manufacturer or authorized distributors?
All TPS51315RGFR 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 TPS51315RGFR meets industry standards.
7.What is the process for return or replacement of TPS51315RGFR?
All TPS51315RGFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51315RGFR, 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 TPS51315RGFR part is unused and in its original packaging.
Return procedure for TPS51315RGFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS51315RGFR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
