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Texas Instruments TPS621361RGXT
- Part No.:
- TPS621361RGXT
- Manufacturer:
- Texas Instruments
- Package:
- 11-VFQFN
- Datasheet:
-
TPS621361RGXT.pdf
- Description:
- IC REG BUCK ADJ 4A 11VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
TPS621361RGXT from Texas Instruments is a 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 mobile computers and SSD drives.
For engineers reviewing the TPS621361RGXT datasheet, TPS621361RGXT pinout, TPS621361RGXT application, or TPS621361RGXT equivalent, key selection criteria include its forced-PWM/automatic PFM mode control via MODE pin, active output discharge absence (vs. TPS62136), VSEL/FB2 programmable dual-output-voltage capability, and 3 mm × 2 mm VQFN-11 package compatibility with high-density layouts.
Technical Context
The TPS621361RGXT implements DCS-Control™, combining fast transient response via direct output voltage sensing with internal voltage-mode compensation - enabling stable regulation with low-ESR ceramic capacitors and eliminating external compensation components. Its control loop supports seamless transition between PWM and PFM modes without output voltage disturbance.
Unlike the TPS62136, the TPS621361RGXT omits active output discharge on shutdown (no internal VOS-to-GND switch), retains identical 1 MHz nominal switching frequency in forced PWM mode, and uses the same VSEL/FB2 interface to enable dynamic output voltage scaling - but disables HICCUP overcurrent protection in favor of continuous current limiting during overload.
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 - sustains full load under thermal limits (RθJA = 38.4°C/W) with proper PCB copper area and vias. |
| Output Voltage Range | 0.8 V to 12 V adjustable - set via FB resistor divider; extended to higher voltages using VSEL/FB2 pin-controlled parallel resistor path. |
| Quiescent Current | 18 µA typical - enables ultra-low-power connected-standby operation in portable systems without compromising startup time. |
| Switching Frequency | 1 MHz nominal in forced PWM mode - allows compact 1.5-µH inductor and <22-µF ceramic output capacitance per rail. |
| Feedback Accuracy | ±1% in PWM mode - ensures tight regulation for sensitive SoC core supplies without post-regulation LDOs. |
| Thermal Shutdown | 160°C with 20°C hysteresis - protects against sustained overload while permitting brief peak-current bursts during CPU wake-up. |
Pinout & Package
TPS621361RGXT is housed in a 3.00 mm × 2.00 mm, 11-pin VQFN package (RGX) with wettable flanks and exposed thermal pad for enhanced heat dissipation. Pin 1 is SW; pin 3 is GND; 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 placed adjacent to minimize high-frequency noise coupling. |
| SW (Pin 2) | Switch node | Connects to external 1.5-µH inductor; carries high di/dt; must be routed short and wide to reduce EMI and switching losses. |
| GND (Pin 3) | Ground reference | Primary return path for power and control circuits; tied directly to thermal pad for optimal thermal performance. |
| FB2 (Pin 4) | Secondary feedback node | Open-drain output grounded internally when VSEL = high - adds parallel resistor to R2, increasing VOUT without changing R1. |
| FB (Pin 5) | Main feedback input | Senses divided output voltage; sets base VOUT = 0.7 V × (1 + R1/R2); accuracy ±1% enables precise core rail generation. |
| 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 logic low if EN=low, UVLO active, or thermal shutdown - used for rail sequencing. |
| EN (Pin 8) | Enable control | Logic threshold 0.7–0.83 V rising edge; supports RC-delayed startup and programmable undervoltage lockout via resistor divider. |
| SS/TR (Pin 9) | Soft-start/tracking | Capacitor sets ramp time; voltage input enables output tracking of master supply - critical for multi-rail SoC power sequencing. |
| MODE (Pin 10) | Operation mode select | Pull high for forced PWM (fixed 1 MHz); pull low for automatic PWM/PFM transition - selects efficiency vs. noise trade-off. |
| VSEL (Pin 11) | Voltage scale control | High-level signal activates FB2 switch - enables two discrete output voltages (e.g., 1.2 V / 1.35 V) from one design without BOM change. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control™ topology | Enables <10-µs load transient response with <1% undershoot using only 22-µF ceramic output caps - eliminates need for bulk electrolytics. |
| Adjustable soft-start | External SS/TR capacitor sets controlled VOUT ramp rate - prevents inrush current damage to input capacitors and upstream converters. |
| VSEL/FB2 dual-voltage support | Allows dynamic switching between two regulated outputs (e.g., CPU core and GPU core) using single TPS621361RGXT - reduces component count in heterogeneous SoC designs. |
| 100% duty-cycle mode | Maintains regulation down to VIN ≈ VOUT + 0.3 V - extends battery runtime in deep-discharge conditions for portable SSDs and tablets. |
| Automatic Efficiency Enhancement (AEE™) | Adapts on-time in real time across VIN/VOUT/load - sustains >85% efficiency from 10 mA to 4 A at 5 V out, eliminating manual frequency tuning. |
Applications
| Standard 12-V Rail Supplies | POL for Connected Standby Requirements |
|---|---|
Use Scenario: Converting 12-V intermediate bus to 3.3-V or 5-V for I/O peripherals in industrial gateways and network switches. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, low-noise power with fast transient response to handle bursty Ethernet and USB traffic. Use Value: 1-MHz fixed-frequency operation minimizes filter size; ±1% accuracy eliminates need for post-regulation trimming in field-deployed equipment. | Use Scenario: Powering memory and low-power MCU cores during S0ix sleep states in ultrabooks and 2-in-1 laptops. IC Role / Device Role / Timing Role: Always-on POL converter maintaining sub-20-µA system quiescent current while supporting instant wake-up from deep sleep. Use Value: 18-µA IQ and automatic PFM mode sustain >90% efficiency at 1–10 mA loads - directly extending battery life during idle periods. |
| POL Supply from Single/Multi Li-Ion Battery | Gaming Consoles & SSD Drives |
Use Scenario: Regulating 3.0–17-V battery stack (1–4 cells) to 1.2-V CPU core voltage in handheld gaming devices and drones. IC Role / Device Role / Timing Role: High-efficiency step-down converter with 100% duty-cycle capability to maximize usable battery capacity near end-of-discharge. Use Value: Seamless PWM-to-PFM transition maintains >88% efficiency across full load range - avoids thermal throttling during sustained gameplay. | Use Scenario: Providing tightly regulated 1.1-V or 1.8-V VDDQ to NAND flash controllers in PCIe Gen4 SSDs with aggressive thermal constraints. IC Role / Device Role / Timing Role: Compact, high-density POL solution delivering 4-A peak current with <10-mV ripple to meet JEDEC DDR timing margins. Use Value: 3 mm × 2 mm VQFN package fits within 8-mm² board area; DCS-Control™ ensures <5-µs recovery from 2-A load steps - preventing data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62136RGXT | Includes active output discharge (VOS switch), HICCUP overcurrent protection, and identical pinout/package. | Required where safe shutdown discharge is mandated (e.g., FPGA configuration retention, non-volatile memory backup). | Select TPS62136RGXT when output discharge is needed; otherwise TPS621361RGXT offers simpler biasing and lower standby current. |
| TPS621351RGXT | 2.5-MHz switching frequency, same VSEL/FB2 interface, no output discharge, but lower max output current (3 A). | Better suited for space-constrained designs needing smaller inductors/caps, but not for 4-A SSD controller rails. | Choose TPS621351RGXT only if board area is critical and load current stays ≤3 A; verify thermal margin at 2.5 MHz. |
Compared with TPS62136RGXT, the TPS621361RGXT trades output discharge for reduced complexity and slightly lower IQ, while TPS621351RGXT sacrifices current capability and thermal headroom for higher frequency - making TPS621361RGXT optimal for balanced 4-A POL applications where discharge is unnecessary.
Availability
TPS621361RGXT is available at Aetrix Electronics and suitable for standard 12-V rail supplies, POL for connected standby requirements, and POL supply from single or multiple Li-Ion battery applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for TPS621361RGXT 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 and automotive-grade reliability.
The TPS62136x product line was engineered specifically for point-of-load power delivery in space-constrained, thermally demanding portable and computing systems - emphasizing ultra-low IQ, seamless light-load efficiency, and robust transient response without external compensation.
FAQ
What is the key functional difference between TPS621361RGXT and TPS62136RGXT?
The TPS621361RGXT lacks the active output discharge circuit present in the TPS62136RGXT - meaning it does not actively pull the output voltage to ground during shutdown. This simplifies biasing and reduces leakage paths but requires external discharge circuitry if rapid VOUT decay is needed for system safety or sequencing. All other electrical specs, pinout, and package are identical.
Does TPS621361RGXT support 100% duty-cycle operation, and what is its minimum input voltage for regulation?
Yes, TPS621361RGXT supports 100% duty-cycle mode to maintain regulation when input voltage approaches output voltage. Minimum input for regulation depends on load and VOUT: for example, at 1.2 V out and 4 A load, VIN must stay above ~1.35 V to avoid dropout - calculated using RDS(on) and inductor DCR per Equation 5 in the datasheet. This extends usable battery range in portable SSDs.
How does the VSEL/FB2 feature work in TPS621361RGXT, and what design benefit does it provide?
In TPS621361RGXT, asserting VSEL high connects an internal ~20-Ω switch from FB2 to GND, placing a resistor in parallel with R2 in the feedback divider - thereby increasing VOUT without modifying R1. This enables two discrete output voltages (e.g., 1.2 V and 1.35 V) from one PCB layout, reducing BOM variants and supporting dynamic voltage scaling in SoC-based systems.
What thermal performance can be expected from TPS621361RGXT in a standard 4-layer PCB layout?
On a JEDEC 51-5 compliant 4-layer PCB with 6 thermal vias under the exposed pad, TPS621361RGXT achieves RθJA = 38.4°C/W. At 4 A and 12-V input to 5-V output, power dissipation is ~1.2 W - resulting in ~46°C junction rise above ambient. With 85°C max TJ, this allows reliable operation up to ~39°C ambient, meeting requirements for fanless SSD enclosures and tablet motherboards.
Can TPS621361RGXT be used in forced PWM mode only, and how is that configured?
Yes, TPS621361RGXT operates in forced PWM mode when the MODE pin is pulled high (≥0.9 V). In this mode, switching frequency remains fixed at ~1 MHz regardless of load, eliminating PFM-induced frequency variation and associated EMI spread - ideal for noise-sensitive RF sections or deterministic timing-critical applications like DDR memory termination.
TPS621361RGXT 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)
TPS621361RGXT FAQ
1.How can I place an order for TPS621361RGXT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS621361RGXT 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 TPS621361RGXT reliable?
The price and inventory of TPS621361RGXT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS621361RGXT is usually 5 days.
3.What payment methods are accepted for TPS621361RGXT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS621361RGXT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS621361RGXT?
TPS621361RGXT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS621361RGXT 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 TPS621361RGXT?
For technical support, including TPS621361RGXT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS621361RGXT requirements.
6.How does Aetrix verify that TPS621361RGXT is sourced from the original manufacturer or authorized distributors?
All TPS621361RGXT 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 TPS621361RGXT meets industry standards.
7.What is the process for return or replacement of TPS621361RGXT?
All TPS621361RGXT units undergo pre-shipment inspection (PSI). If there is an issue with TPS621361RGXT, 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 TPS621361RGXT part is unused and in its original packaging.
Return procedure for TPS621361RGXT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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