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Texas Instruments TPS621351RGXT
- Part No.:
- TPS621351RGXT
- Manufacturer:
- Texas Instruments
- Package:
- 11-VFQFN
- Datasheet:
-
TPS621351RGXT.pdf
- Description:
- IC REG BUCK ADJ 4A 11VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:371
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Product details
Overview
TPS621351RGXT from Texas Instruments is a high-accuracy, synchronous step-down DC-DC converter using DCS-Control™ topology, delivering up to 4 A continuous output current with ±1% output voltage accuracy in PWM mode, 18 µA typical quiescent current, and operation across 3 V to 17 V input range - designed for POL supplies in battery-powered embedded computers and SSD drives.
For engineers reviewing the TPS621351RGXT datasheet, TPS621351RGXT pinout, TPS621351RGXT application, or TPS621351RGXT equivalent, key selection considerations include its forced-PWM/automatic PFM mode control via MODE pin, VSEL/FB2-based dual-output-voltage scaling, absence of active output discharge (vs. TPS62135), and 3-mm × 2-mm VQFN-11 package with verified thermal resistance (RθJA = 38.4 °C/W).
Technical Context
The TPS621351RGXT implements DCS-Control™ - a hybrid regulation architecture combining fast comparator-based transient response with internal voltage feedback compensation - enabling seamless transition between PWM and PFM modes without output voltage disturbance. Its control loop supports precise 2.5 MHz nominal switching frequency in forced PWM and adaptive on-time modulation in PFM for efficiency optimization.
Unlike the TPS62135, the TPS621351RGXT omits active output discharge; its VSEL pin enables dynamic output voltage scaling by activating an internal switch from FB2 to GND, while the MODE pin selects between automatic efficiency enhancement (AEE™) and fixed-frequency PWM operation - critical for low-power sequencing and load-transient-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 17 V - supports multi-cell Li-ion batteries and standard 12-V intermediate rails without external pre-regulation. |
| Output Current | 4 A continuous - sustains full-load operation under thermal limits (RθJA = 38.4 °C/W) on standard 4-layer PCBs. |
| Output Voltage Accuracy | ±1% in PWM mode - ensures stable core voltage for processors and FPGAs requiring tight regulation tolerance. |
| Quiescent Current | 18 µA typical - enables ultra-low-power standby performance in connected-standby systems. |
| Switching Frequency | 2.5 MHz nominal in forced PWM - allows use of compact 1-µH inductors and minimizes EMI filtering requirements. |
| Feedback Reference | 0.7 V at FB pin - sets minimum output voltage to 0.8 V with standard resistor divider, simplifying design scalability. |
| Thermal Shutdown | 160 °C junction temperature with 20 °C hysteresis - provides robust overtemperature protection without latch-up. |
Pinout & Package
TPS621351RGXT is housed in a 3.00 mm × 2.00 mm, 11-pin VQFN package (RGX) with exposed thermal pad for enhanced power dissipation. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 8) | Enable control input | Logic-level interface with 0.8 V rising threshold; enables programmable UVLO and precise power-up sequencing. |
| FB (Pin 5) | Feedback voltage input | Monitors output via resistor divider; regulates output to 0.7 V reference - defines base output voltage (≥0.8 V). |
| FB2 (Pin 4) | Open-drain auxiliary feedback terminal | Connects internal switch to GND when VSEL = high, enabling second output voltage level via parallel resistor path. |
| GND (Pin 3) | Power and signal ground | Primary return path for power MOSFETs and analog circuitry; requires low-impedance PCB connection to thermal pad. |
| MODE (Pin 10) | Operation mode select | Pull-high forces 2.5 MHz PWM; pull-low enables AEE™-driven PFM/PWM auto-transition for wide-load efficiency optimization. |
| PG (Pin 7) | Open-drain power-good indicator | Sinks 2 mA; asserts low during startup, UVLO, shutdown, or thermal fault - used for rail sequencing and system monitoring. |
| VOS (Pin 6) | Output voltage sense | Direct connection to output capacitor positive terminal - improves load regulation by compensating for PCB trace IR drop. |
| VIN (Pin 1) | Main power input | Accepts 3–17 V; requires local 10-µF ceramic input capacitance placed adjacent to minimize high-frequency noise. |
| VSEL (Pin 11) | Voltage scaling control | High logic activates FB2-to-GND switch, enabling dynamic reconfiguration between two preset output voltages. |
| SS/TR (Pin 9) | Soft-start/tracking input | External capacitor sets ramp time; also accepts external voltage for supply tracking during multi-rail power-up. |
| SW (Pin 2) | Power switch node | Drives external 1-µH inductor; connects internally to high-side and low-side MOSFETs - requires tight layout for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control™ topology | Combines hysteretic speed with voltage-mode stability - achieves <10 µs load transient response and <10 mV undershoot with minimal output capacitance. |
| Adjustable soft-start | Programmable rise time via SS/TR capacitor - prevents inrush current and enables controlled power-up in multi-rail systems. |
| 100% duty-cycle mode | Maintains regulation down to VIN ≈ VOUT + 15% - extends battery runtime in deep-discharge conditions without dropout. |
| Automatic Efficiency Enhancement (AEE™) | Dynamically adjusts on-time in PFM mode based on VIN/VOUT ratio - sustains >85% efficiency from 1 mA to 4 A load range. |
| Precise ENABLE input | 0.8 V rising threshold with 100 mV hysteresis - supports RC-delayed startup and user-defined undervoltage lockout thresholds. |
| VSEL/FB2 dual-voltage scaling | Hardware-selectable second output level without external DAC or microcontroller - reduces BOM count in adaptive-core designs. |
Applications
| Mobile Embedded Computing | SSD Power Management |
|---|---|
|
Use Scenario: Powering ARM-based SoCs in fanless tablets with dual-core CPU and LPDDR3 memory requiring 1.1 V @ 3 A and 3.3 V @ 0.5 A. IC Role / Device Role / Timing Role: Primary POL regulator delivering tightly regulated core voltage with <10 µs transient response and ±1% DC accuracy. Use Value: Enables connected-standby operation with 18 µA quiescent current and seamless PWM-to-PFM transition during idle states. |
Use Scenario: Supplying 1.2 V and 3.3 V rails to NAND flash controllers and PCIe interface ICs in M.2 NVMe SSD modules. IC Role / Device Role / Timing Role: Dual-output configurable buck converter managing dynamic voltage scaling for NAND I/O and controller logic domains. Use Value: VSEL/FB2 hardware reconfiguration eliminates need for separate regulators or firmware-controlled DACs. |
| Gaming Console SoC Core Supply | Battery-Powered Industrial HMI |
|
Use Scenario: Delivering 0.95 V @ 4 A to GPU/CPU complex in portable gaming handhelds powered by 3S Li-ion (9–12.6 V). IC Role / Device Role / Timing Role: High-current, high-efficiency step-down converter operating in forced PWM mode for consistent 2.5 MHz switching during burst loads. Use Value: 100% duty-cycle capability maintains regulation down to 10.5 V input - extending usable battery range by ~12% vs. conventional buck ICs. |
Use Scenario: Providing 5 V @ 2 A and 3.3 V @ 1 A from 12 V vehicle battery or 4S LiPo pack in ruggedized human-machine interface terminals. IC Role / Device Role / Timing Role: Main system power IC supporting cold-crank immunity (down to 3 V) and thermal-safe operation in sealed enclosures. Use Value: Integrated thermal shutdown (160 °C) and UVLO (2.8 V rising) prevent malfunction during automotive load-dump or brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62135RGXT | Includes active output discharge (100 Ω), HICCUP overcurrent protection, and identical pinout/package. | Required where safe output discharge is mandated (e.g., FPGA configuration retention, hot-swap compliance). | Select TPS62135RGXT if output discharge is needed; otherwise TPS621351RGXT offers lower cost and same regulation performance. |
| TPS621361RGXT | 1 MHz nominal switching frequency, same VSEL/FB2 and MODE functionality, but no AEE™ or 100% duty-cycle mode. | Better suited for noise-sensitive analog subsystems where lower switching frequency reduces EMI coupling. | Choose TPS621361RGXT only when 2.5 MHz EMI is problematic and light-load efficiency is secondary to spectral purity. |
Compared with TPS62135RGXT, the TPS621351RGXT trades active discharge for reduced complexity and cost, while retaining identical accuracy, thermal specs, and control features; versus TPS621361RGXT, it delivers superior light-load efficiency and wider VIN-to-VOUT regulation range due to AEE™ and 100% duty-cycle support.
Availability
TPS621351RGXT is available at Aetrix Electronics and suitable for mobile embedded computing, SSD power management, gaming console SoC supplies, and battery-powered industrial HMI requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS621351RGXT 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 technologies, with decades of expertise in high-efficiency DC-DC conversion and system-level power architecture.
The TPS621351RGXT belongs to TI's DCS-Control™ synchronous buck converter family, engineered specifically for high-density point-of-load applications demanding ultra-low quiescent current, fast transient response, and seamless light-load efficiency - targeting next-generation portable and always-on electronics.
FAQ
What is the key functional difference between TPS621351RGXT and TPS62135RGXT?
The TPS621351RGXT lacks active output discharge - unlike the TPS62135RGXT, which integrates a 100-Ω discharge switch on the VOS pin. This means TPS621351RGXT cannot actively pull down the output voltage after shutdown. All other electrical specifications, pinout, package, and control features (VSEL, MODE, PG, etc.) are identical between the two devices. The TPS621351RGXT is functionally optimized for cost-sensitive applications where output discharge is not required.
Does TPS621351RGXT support 100% duty-cycle operation, and what is its practical benefit?
Yes, the TPS621351RGXT supports 100% duty-cycle operation when input voltage approaches output voltage - maintaining regulation down to VIN ≈ VOUT + 15%. This feature is critical in battery-powered systems: for example, with a 3.3 V output and 3S Li-ion input (9–12.6 V), it extends usable battery life by allowing continued operation even as cell voltage drops below 10.5 V, avoiding premature shutdown that would occur with conventional buck converters lacking this capability.
How does the VSEL/FB2 feature work in TPS621351RGXT, and what design value does it provide?
In the TPS621351RGXT, asserting VSEL high activates an internal ~20 Ω switch from FB2 to GND, placing an additional resistor in parallel with R2 of the feedback divider. This lowers the effective divider ratio and raises the output voltage - enabling hardware-selectable dual output levels without external DACs or microcontrollers. It simplifies dynamic voltage scaling in SoC designs (e.g., switching between performance and low-power states) and reduces BOM count and firmware overhead.
What is the thermal performance of TPS621351RGXT on a standard PCB layout?
The TPS621351RGXT has a junction-to-ambient thermal resistance (RθJA) of 38.4 °C/W when mounted on a 4-layer PCB with 6 thermal vias per the JEDEC 51-5 standard. At 4 A output current and 12 V input, typical power dissipation is ~0.5 W - resulting in ~19 °C junction-to-ambient rise above ambient. This allows reliable continuous operation up to +106 °C ambient temperature before reaching the 125 °C maximum operating junction temperature.
Can TPS621351RGXT be used in forced PWM mode only, and how is it configured?
Yes, the TPS621351RGXT can be operated exclusively in forced PWM mode by pulling the MODE pin high (≥0.9 V). In this configuration, the device runs at a nominal 2.5 MHz switching frequency regardless of load, eliminating PFM mode artifacts like variable frequency and low-frequency ripple. This is ideal for noise-sensitive applications such as RF front-ends or high-speed ADC/DAC supplies where predictable EMI spectrum and minimal output voltage perturbation are essential.
TPS621351RGXT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 11-VFQFN
- 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):
- 17V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 4A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 11-VQFN-HR (2x3)
TPS621351RGXT FAQ
1.How can I place an order for TPS621351RGXT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS621351RGXT 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 TPS621351RGXT reliable?
The price and inventory of TPS621351RGXT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS621351RGXT is usually 5 days.
3.What payment methods are accepted for TPS621351RGXT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS621351RGXT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS621351RGXT?
TPS621351RGXT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS621351RGXT 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 TPS621351RGXT?
For technical support, including TPS621351RGXT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS621351RGXT requirements.
6.How does Aetrix verify that TPS621351RGXT is sourced from the original manufacturer or authorized distributors?
All TPS621351RGXT 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 TPS621351RGXT meets industry standards.
7.What is the process for return or replacement of TPS621351RGXT?
All TPS621351RGXT units undergo pre-shipment inspection (PSI). If there is an issue with TPS621351RGXT, 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 TPS621351RGXT part is unused and in its original packaging.
Return procedure for TPS621351RGXT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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