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Texas Instruments TPS54140DGQR
- Part No.:
- TPS54140DGQR
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS54140DGQR.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,007
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Product details
Overview
TPS54140DGQR from Texas Instruments is a 42-V, 1.5-A synchronous step-down DC-DC converter with integrated 200-mΩ high-side MOSFET, Eco-mode™ pulse-skipping for light-load efficiency, and adjustable 100-kHz to 2.5-MHz switching frequency. It delivers regulated 3.3-V or 5-V output in industrial power supplies with input ranges up to 42 V.
For engineers reviewing the TPS54140DGQR datasheet, TPS54140DGQR pinout, TPS54140DGQR application, or TPS54140DGQR equivalent, key selection criteria include its 116-μA quiescent current, UVLO programmability via EN pin, PWRGD open-drain power-good signal, and MSOP-10 PowerPAD™ thermal performance in space-constrained 12-V/24-V systems.
Technical Context
The TPS54140DGQR implements constant-frequency peak-current mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles. Its error amplifier (26 μ℧ transconductance during slow start) drives COMP to regulate VSENSE against a 0.8-V reference with ±1.6% accuracy over temperature.
Switching is synchronized via RT/CLK pin-either resistor-set (100–2500 kHz) or external clock (300–2200 kHz) with PLL lock-in time under 100 μs. Boot UVLO ensures high-side MOSFET turn-off when BOOT–PH falls below 2.1 V, enabling reliable 100% duty-cycle operation during dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 42 V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Output Current | 1.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Quiescent Current | 116 μA - enables >10-year battery life in always-on monitoring applications with light-load operation. |
| Switching Frequency | 100 kHz to 2.5 MHz - allows optimization of inductor size (e.g., 2.2 μH at 1 MHz) and EMI filtering. |
| Reference Voltage | 0.8 V ±1.6% - sets precise output voltage via external resistor divider; enables 3.3 V, 5 V, or custom outputs. |
| Power-Good Threshold | 94% to 107% of nominal VOUT - provides robust system reset signaling with hysteresis for noise immunity. |
| Shutdown Current | 1.3 μA - minimizes standby drain in battery-backed systems requiring deep-sleep modes. |
Pinout & Package
TPS54140DGQR is housed in a thermally enhanced 10-pin MSOP package with exposed PowerPAD™ (3.00 mm × 3.00 mm), requiring PCB thermal pad connection to GND for junction-to-board thermal resistance of 38.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects to 0.1-μF ceramic capacitor between BOOT and PH; powers high-side gate drive; monitored by internal UVLO. |
| VIN | Main input supply | Accepts 3.5–42 V; powers internal bias circuits and high-side driver; includes 2.5-V fixed UVLO threshold. |
| EN | Enable & UVLO control | Pulled up internally; float to enable; pull below 1.25 V to disable; used with resistors to raise UVLO threshold. |
| SS/TR | Slow-start & tracking input | Controls output ramp time via external capacitor; supports sequencing and tracking of multiple rails. |
| RT/CLK | Frequency set/sync input | Resistor-to-GND sets fSW (100–2500 kHz); external clock (300–2200 kHz) overrides to PLL sync mode. |
| PWRGD | Open-drain power-good output | Asserts low if VSENSE < 94% or > 107% of target; requires external pullup for system reset or sequencing logic. |
| VSENSE | Feedback input | Inverting input of error amplifier; compares divided output voltage to 0.8-V reference for regulation. |
| COMP | Error amplifier output | Drives PWM comparator; connects to external RC network for loop compensation and stability. |
| GND | Signal & power ground | Reference for all analog circuitry; must be connected to exposed thermal pad for thermal and electrical integrity. |
| PH | Switch node | Source of internal high-side MOSFET; connects to inductor and bootstrap capacitor; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ Pulse Skipping | Reduces no-load supply current to 116 μA while maintaining regulation-critical for energy-sensitive IoT nodes. |
| Integrated Boot Recharge Diode | Eliminates external diode; simplifies layout and improves reliability in high-duty-cycle or dropout conditions. |
| Adjustable UVLO with Hysteresis | EN pin allows user-defined startup/shutdown thresholds using two resistors-enables clean power sequencing. |
| Frequency Foldback | Automatically lowers fSW during startup and overload to limit inductor current and improve fault recovery. |
| Thermal Shutdown Protection | Triggers at 182°C junction temperature and holds shutdown until cooldown-prevents permanent damage. |
Applications
| Industrial PLC I/O Module | Automotive Aftermarket GPS Tracker |
|---|---|
|
Use Scenario: Powers isolated CAN transceivers, ADCs, and microcontrollers from 24-V vehicle battery with load dumps up to 42 V. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3-V rail; PWRGD signals MCU reset on undervoltage. Use Value: 42-V input rating withstands ISO 7637-2 load dump transients; 1.3-μA shutdown current extends battery backup runtime. |
Use Scenario: Supplies 5-V logic and RF front-end in compact dash-mounted navigation units with variable input (9–16 V). IC Role / Device Role / Timing Role: Main DC-DC converter with SS/TR pin enabling controlled power-up sequence before GPS module initialization. Use Value: Adjustable UVLO prevents brownout during cranking; Eco-mode maintains <120-μA system sleep current. |
| Smart Sensor Node (4–20 mA Loop) | 12-V Industrial Ethernet Switch |
|
Use Scenario: Powers ultra-low-power sensor ASIC and wireless transceiver from 12-V loop supply with tight thermal constraints. IC Role / Device Role / Timing Role: Efficient step-down regulator with MSOP PowerPAD™ dissipating heat directly to PCB copper. Use Value: 67.4°C/W RθJA enables full 1.5-A load in 50°C ambient without heatsink; 0.8-V reference supports precision 2.5-V analog rails. |
Use Scenario: Generates 3.3-V and 1.2-V rails for PHY and switch controller in fanless DIN-rail mounted equipment. IC Role / Device Role / Timing Role: First-stage buck converter feeding secondary LDOs; RT/CLK synchronized to system clock for EMI reduction. Use Value: Synchronization capability eliminates beat frequencies; 200-mΩ MOSFET achieves >92% efficiency at 1-A load, 12-V input, 3.3-V output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDGQRQ1 | Automotive-grade (AEC-Q100), 65-V max input, 0.6-A output, higher BOM cost, no Eco-mode | Required for automotive safety-critical systems; not drop-in due to lower current and different compensation scheme | Select for automotive qualification; avoid for industrial cost-sensitive designs needing 1.5-A output |
| MP2451DT-LF-Z | 36-V max input, 0.6-A output, fixed 2-MHz fSW, no PWRGD or SS/TR, 250-μA IQ | Suitable for simpler, lower-current applications where sequencing and power-good are unnecessary | Use only when output current ≤0.6 A and system-level sequencing is handled externally |
Compared with TPS54140DGQR, LM5164QDGQRQ1 offers automotive qualification but sacrifices 1.5-A capability and light-load efficiency; MP2451DT-LF-Z reduces feature count and current rating significantly-neither is pin-compatible, and both require PCB redesign and loop compensation revalidation.
Availability
TPS54140DGQR is available at Aetrix Electronics and suitable for industrial PLCs, automotive aftermarket electronics, smart sensor nodes, and 12-V Ethernet infrastructure requiring stable component supply across extended temperature and voltage ranges.
Supply support for TPS54140DGQR 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The TPS54140DGQR belongs to TI's SWIFT™ family of high-voltage buck regulators, engineered specifically for rugged industrial and automotive power conversion where wide VIN, thermal resilience, and precise sequencing are mandatory.
FAQ
What is the minimum input voltage required for TPS54140DGQR to start switching?
The TPS54140DGQR has an internal undervoltage lockout threshold of 2.5 V, but actual startup depends on configuration. With EN pin floating, it begins switching when VIN exceeds ~2.5 V. If EN is used to raise UVLO (e.g., with resistor divider), startup occurs at the programmed threshold-verified to be 7.7 V rising and 6.7 V falling in typical 12-V applications. The TPS54140DGQR datasheet specifies these values under Recommended Operating Conditions.
Can TPS54140DGQR operate with 100% duty cycle, and under what conditions?
Yes, the TPS54140DGQR supports 100% duty cycle operation during dropout, provided the BOOT–PH voltage remains above 2.1 V. This condition is maintained as long as the input–output differential is ≥2.1 V and sufficient load current exists to recharge the boot capacitor through the internal diode. Below that differential or under no-load, the boot UVLO disables the high-side MOSFET until the capacitor recovers. This behavior is explicitly documented in the TPS54140DGQR Functional Block Diagram and Feature Description sections.
How does the PWRGD pin function, and what are its voltage thresholds?
The PWRGD pin is an open-drain output that asserts low when VSENSE falls below 94% or rises above 107% of the nominal output voltage. It deasserts (goes high-impedance) only when VSENSE is within that window-requiring an external pullup resistor to generate a logic-high signal. Thresholds are guaranteed over temperature and load; typical hysteresis is 2% (107% − 94%). These values are confirmed in the Electrical Characteristics table of the TPS54140DGQR datasheet.
What is the purpose of the SS/TR pin, and how is it used for power sequencing?
The SS/TR pin controls output voltage ramp rate via an external capacitor (slow-start) or tracks another voltage rail via a resistor divider (tracking). During sequencing, connecting SS/TR to a prior rail's output ensures the TPS54140DGQR output follows that rail's rise, preventing backfeeding or latch-up. The pin is actively discharged during faults, guaranteeing repeatable restart behavior. This dual functionality is detailed in the TPS54140DGQR Pin Functions and Feature Description sections.
Is TPS54140DGQR compatible with WEBENCH® design tools?
Yes, the TPS54140DGQR is fully supported by Texas Instruments' WEBENCH® Power Designer tool (www.ti.com/webench). Users can generate complete schematics, perform thermal and efficiency simulations, select optimized external components (inductor, capacitors, resistors), and export BOMs-all validated against the TPS54140DGQR's electrical model and thermal characteristics. This integration is explicitly noted in the TPS54140DGQR datasheet Features section.
TPS54140DGQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Eco-Mode™
- Package/Case:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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):
- 3.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 39V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 100kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HVSSOP
TPS54140DGQR FAQ
1.How can I place an order for TPS54140DGQR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54140DGQR 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 TPS54140DGQR reliable?
The price and inventory of TPS54140DGQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54140DGQR is usually 5 days.
3.What payment methods are accepted for TPS54140DGQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54140DGQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54140DGQR?
TPS54140DGQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54140DGQR 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 TPS54140DGQR?
For technical support, including TPS54140DGQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54140DGQR requirements.
6.How does Aetrix verify that TPS54140DGQR is sourced from the original manufacturer or authorized distributors?
All TPS54140DGQR 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 TPS54140DGQR meets industry standards.
7.What is the process for return or replacement of TPS54140DGQR?
All TPS54140DGQR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54140DGQR, 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 TPS54140DGQR part is unused and in its original packaging.
Return procedure for TPS54140DGQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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