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Texas Instruments TPS621361RGXR
- Part No.:
- TPS621361RGXR
- Manufacturer:
- Texas Instruments
- Package:
- 11-VFQFN
- Datasheet:
-
TPS621361RGXR.pdf
- Description:
- IC REG BUCK ADJ 4A 11VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,754
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Product details
Overview
TPS621361RGXR from Texas Instruments is a synchronous step-down DC-DC converter with DCS-Control™ topology, delivering up to 4 A continuous output current across an input range of 3 V to 17 V and adjustable output voltage from 0.8 V to 12 V. It features ±1% output voltage accuracy in PWM mode, 18 µA typical quiescent current, and forced-PWM or automatic PWM/PFM operation-designed for high-efficiency POL supplies in battery-powered embedded computers and SSD drives.
For engineers reviewing the TPS621361RGXR datasheet, TPS621361RGXR pinout, TPS621361RGXR application, or TPS621361RGXR equivalent, key selection considerations include its 1-MHz nominal switching frequency, VQFN-11 (3 mm × 2 mm) package, absence of active output discharge, and HICCUP-free overcurrent protection-critical for stable low-power sequencing and multi-rail power integrity.
Technical Context
The TPS621361RGXR implements DCS-Control™ topology, combining fast transient response via direct output voltage sensing with internal voltage-mode compensation for stable regulation using low-ESR ceramic capacitors. Its control loop supports seamless transition between PWM and PFM modes based on load, with MODE pin selection enabling either fixed 1-MHz operation or Automatic Efficiency Enhancement (AEE™) for adaptive frequency scaling.
Unlike the TPS62136, the TPS621361RGXR omits active output discharge and HICCUP short-circuit protection-instead providing continuous current limiting without auto-restart cycles. It retains all core functional pins including VSEL/FB2 for dual-output-voltage configuration, PG open-drain power-good signaling, and SS/TR for soft-start timing or voltage tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 17 V - supports single/multi-cell Li-ion batteries and standard 12-V intermediate rails without external pre-regulation. |
| Output Current | 4 A continuous - sufficient for CPU I/O, FPGA core logic, or SSD controller power domains. |
| Output Voltage Range | 0.8 V to 12 V - programmable via external resistor divider; enables direct supply to DDR, ARM cores, or analog subsystems. |
| Quiescent Current | 18 µA typical - enables ultra-low-power standby operation in connected-standby systems. |
| Switching Frequency | 1 MHz nominal (forced PWM) - allows compact 1.5-µH inductor and small ceramic output capacitors (≥12 µF). |
| Feedback Accuracy | ±1% in PWM mode - ensures tight regulation for sensitive digital loads without post-regulation LDOs. |
| Thermal Shutdown | 160°C with 20°C hysteresis - protects against sustained overload while permitting brief peak-current bursts. |
Pinout & Package
TPS621361RGXR is housed in a 3-mm × 2-mm, 11-pin VQFN (RGX) package with wettable flanks, optimized for thermal performance (RθJA = 38.4°C/W) and automated optical inspection. Pin 3 is GND; pin 1 is VIN; pin 2 is SW; pin 5 is FB; pin 4 is FB2; pin 10 is MODE; pin 7 is PG; pin 6 is VOS; pin 8 is EN; pin 9 is SS/TR; pin 11 is VSEL.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 3–17 V; requires local 10-µF ceramic capacitor to minimize high-frequency noise injection. |
| SW (Pin 2) | Power switch node | Connects to external 1.5-µH inductor; carries high di/dt ripple current-requires tight layout to ground plane. |
| GND (Pin 3) | Power and signal reference | Primary thermal path; must be tied to large PCB copper area with ≥6 thermal vias for thermal management. |
| FB2 (Pin 4) | Secondary feedback node | Open-drain switch to GND when VSEL = high; enables dynamic output voltage scaling by adding parallel resistor to R2. |
| FB (Pin 5) | Main feedback input | Senses 0.7-V reference; sets output via R1/R2 divider-accuracy directly impacts system-level voltage tolerance. |
| VOS (Pin 6) | Output voltage sense | Direct connection to output capacitor anode improves load regulation by compensating for PCB trace resistance. |
| PG (Pin 7) | Power-good indicator | Open-drain output pulled high externally; asserts low if EN=low, UVLO active, or thermal shutdown-used for rail sequencing. |
| EN (Pin 8) | Enable control | Logic-compatible input with 0.7–0.83 V rising threshold; supports precise undervoltage lockout via resistor divider. |
| SS/TR (Pin 9) | Soft-start/tracking | Capacitor-connected for controlled startup ramp; voltage-driven for synchronized multi-rail tracking in forced PWM mode. |
| MODE (Pin 10) | Operation mode select | Pull high for fixed 1-MHz PWM; pull low for AEE-enabled PWM/PFM-determines light-load efficiency profile. |
| VSEL (Pin 11) | Voltage scale enable | High/low logic input that activates FB2 switch-enables two discrete output voltages without external MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control™ topology | Enables <10-µs load transient response with minimal output capacitance-critical for burst-mode processors. |
| Adjustable soft-start | Startup slew rate controlled by external SS/TR capacitor-prevents inrush current damage to input sources and downstream circuitry. |
| 100% duty-cycle mode | Maintains regulation down to VIN ≈ VOUT + 15%, extending battery runtime in deep-discharge conditions. |
| Automatic Efficiency Enhancement (AEE™) | Adapts switching frequency in PFM mode to sustain >85% efficiency at loads as low as 1 mA. |
| Precise ENABLE threshold | 0.7–0.83 V rising edge enables accurate input UVLO setting-eliminates need for external supervisor ICs. |
| VSEL/FB2 voltage scaling | Allows dual-output-voltage configuration (e.g., 1.2 V / 1.8 V) using one IC-reduces BOM count and board space. |
Applications
| Mobile Computing Power Rail | SSD Controller Supply |
|---|---|
Use Scenario: Powering ARM-based SoC I/O and memory interfaces in tablets and 2-in-1 laptops operating from 3–4.2 V single-cell Li-ion. IC Role / Device Role / Timing Role: Primary POL regulator delivering 1.8 V @ 3 A with <100-ns transient response to CPU DVFS events. Use Value: DCS-Control™ ensures <15-mV output deviation during 2-A load steps-avoids timing violations in high-speed SerDes links. | Use Scenario: Generating 3.3 V for NAND flash controllers and PCIe Gen3 PHYs in M.2 NVMe SSDs powered from 12-V system rail. IC Role / Device Role / Timing Role: High-current buck stage with 1-MHz switching-minimizes EMI near RF-sensitive storage interfaces. Use Value: 4-A capability and 18-µA quiescent current support both active burst writes and ultra-low-power sleep states. |
| Gaming Console Core Logic | Industrial Embedded Computer |
Use Scenario: Supplying 0.85 V core voltage to GPU clusters in portable gaming hardware with thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck converter with VOS sensing-compensates for IR drop across 50-mΩ PCB traces. Use Value: ±1% PWM-mode accuracy maintains GPU clock stability under variable thermal load-prevents throttling artifacts. | Use Scenario: Providing 5 V and 12 V auxiliary rails in fanless industrial PCs using wide-input 24-V DC supply. IC Role / Device Role / Timing Role: Dual-output configuration via VSEL/FB2-generates both rails from single TPS621361RGXR with independent sequencing. Use Value: PG output and precise EN threshold enable deterministic power-up order-required for BIOS initialization compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62136RGXR | Includes active output discharge and HICCUP overcurrent protection; otherwise identical pinout, specs, and feature set. | Required where rapid output discharge prevents back-powering of upstream circuitry during shutdown. | Select TPS62136RGXR only if active discharge is mandatory-otherwise TPS621361RGXR offers simpler fault behavior. |
| TPS621351RGXR | 2.5-MHz switching frequency, same 3–17 V input, 4-A rating, but no HICCUP or output discharge; smaller inductor (0.47 µH) possible. | Better suited for space-constrained designs needing higher frequency to shrink passive size-trade-off is lower light-load efficiency. | Choose TPS621351RGXR when board area is critical and 1-MHz EMI filtering is impractical; verify thermal performance at full load. |
Compared with TPS62136RGXR, the TPS621361RGXR removes active discharge and HICCUP restart-simplifying fault recovery but requiring external discharge circuitry if needed. Against TPS621351RGXR, it trades higher frequency for better light-load efficiency and lower EMI susceptibility at the cost of larger magnetics.
Availability
TPS621361RGXR is available at Aetrix Electronics and suitable for mobile computing power rails, SSD controller supplies, gaming console core logic, and industrial embedded computers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS621361RGXR 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.
The TPS62136x product line was designed specifically for high-density point-of-load applications in battery-powered and multi-rail systems-emphasizing efficiency across full load range, fast transient response, and seamless integration into compact PCB layouts.
FAQ
What is the maximum continuous output current supported by the TPS621361RGXR?
The TPS621361RGXR supports up to 4 A of continuous output current under recommended operating conditions (TJ ≤ +125°C, proper PCB thermal design). This rating assumes use of a 1.5-µH inductor and ≥12 µF effective output capacitance. Derating applies above +85°C ambient or with inadequate copper pour and thermal vias.
Does the TPS621361RGXR include active output discharge functionality?
No, the TPS621361RGXR does not include active output discharge. Unlike the TPS62136RGXR, which integrates an internal discharge FET on the VOS pin, the TPS621361RGXR leaves the output floating during shutdown. If rapid discharge is required, an external resistor or MOSFET-based discharge circuit must be added.
How does the MODE pin affect the operation of the TPS621361RGXR?
When the MODE pin is pulled high, the TPS621361RGXR operates in forced PWM mode at ~1 MHz, ensuring constant frequency and predictable EMI. When pulled low, it enters automatic PWM/PFM mode with Adaptive Efficiency Enhancement (AEE™), dynamically adjusting frequency to maintain >85% efficiency from 1 mA to 4 A load.
Can the TPS621361RGXR be used for output voltage tracking during power-up?
Yes, the TPS621361RGXR supports voltage tracking via the SS/TR pin in forced PWM mode. Applying a ramped voltage to SS/TR causes the output to follow proportionally (1:1 gain), enabling synchronized startup with master rails. Tracking is disabled in PFM mode due to variable frequency behavior.
What is the purpose of the VSEL and FB2 pins on the TPS621361RGXR?
The VSEL and FB2 pins enable dual-output-voltage configuration: when VSEL is high, an internal switch connects FB2 to GND, placing an additional resistor in parallel with R2 and increasing the feedback divider ratio. This allows two discrete output voltages (e.g., 1.2 V and 1.8 V) using a single TPS621361RGXR without external switches.
TPS621361RGXR 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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 11-VQFN-HR (2x3)
TPS621361RGXR FAQ
1.How can I place an order for TPS621361RGXR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS621361RGXR 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 TPS621361RGXR reliable?
The price and inventory of TPS621361RGXR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS621361RGXR is usually 5 days.
3.What payment methods are accepted for TPS621361RGXR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS621361RGXR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS621361RGXR?
TPS621361RGXR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS621361RGXR 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 TPS621361RGXR?
For technical support, including TPS621361RGXR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS621361RGXR requirements.
6.How does Aetrix verify that TPS621361RGXR is sourced from the original manufacturer or authorized distributors?
All TPS621361RGXR 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 TPS621361RGXR meets industry standards.
7.What is the process for return or replacement of TPS621361RGXR?
All TPS621361RGXR units undergo pre-shipment inspection (PSI). If there is an issue with TPS621361RGXR, 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 TPS621361RGXR part is unused and in its original packaging.
Return procedure for TPS621361RGXR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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