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Texas Instruments TPS54140DGQ
- Part No.:
- TPS54140DGQ
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS54140DGQ.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,549
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Product details
Overview
TPS54140 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 output at up to 1.5 A in industrial power supplies with input ranges from 12 V to 24 V.
For engineers reviewing the TPS54140 datasheet, TPS54140 pinout, TPS54140 application, or TPS54140 equivalent, key selection criteria include its 116-μA quiescent current, UV/OV power-good monitoring, adjustable slow-start via SS/TR pin, and MSOP-10 PowerPAD™ thermal package for high-power-density designs.
Technical Context
The TPS54140 implements constant-frequency peak-current mode control with internal slope compensation to prevent subharmonic oscillation across full duty-cycle range. 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.
Bootstrap operation enables 100% duty cycle capability as long as BOOT–PH voltage exceeds 2.1 V; below that threshold, the high-side MOSFET disables and the low-side path recharges the BOOT capacitor. The RT/CLK pin supports both resistor-set frequency tuning and external clock synchronization via PLL lock.
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 in Eco-mode - enables >10-year battery life in always-on IoT sensor nodes 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 requirements. |
| Reference Voltage | 0.8 V ±1.6% - sets precise output regulation (e.g., 3.3 V via 100 kΩ/24.3 kΩ divider) with minimal drift over –40°C to 150°C. |
| Power-Good Threshold | 94% to 107% of nominal - provides reliable system reset signaling without false triggers during line/load transients. |
| Thermal Resistance | RθJA = 67.4°C/W - requires minimal PCB copper area (≥250 mm² thermal pad) for full 1.5-A load at 70°C ambient. |
Pinout & Package
TPS54140 is housed in a thermally enhanced 10-pin MSOP package with exposed PowerPAD™ (3.00 mm × 3.00 mm body), requiring direct solder connection of the thermal pad to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects to 0.1-μF X7R ceramic capacitor between BOOT and PH; enables gate drive for integrated high-side MOSFET. |
| VIN | Main power input | Accepts 3.5–42 V; powers internal circuitry and high-side driver; must be bypassed with ≥10-μF low-ESR capacitor. |
| EN | Enable control input | Pulled up internally; float to enable; pull below 1.2 V to disable; supports resistor-divider UVLO adjustment. |
| SS/TR | Slow-start/tracking input | Controls output ramp time via external capacitor; overrides internal reference for sequencing or tracking multiple rails. |
| RT/CLK | Frequency set/sync input | Resistor-to-ground sets fSW; external clock edges above 1.9 V trigger PLL sync mode for noise-sensitive applications. |
| PWRGD | Open-drain power-good output | Asserts low when VOUT falls below 92% or rises above 109%; requires external pullup for system monitoring. |
| VSENSE | Feedback input | Inverting input of error amplifier; connected to resistor divider from output to set regulated voltage (e.g., 3.3 V). |
| COMP | Error amplifier output | Drives PWM comparator; connects to Type II/III compensation network for loop stability across load conditions. |
| GND | Analog/digital ground | Common reference for all signals; must be tied to thermal pad for proper thermal and electrical performance. |
| PH | Power switch node | Source of internal high-side MOSFET; connects to inductor and BOOT 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 tight output regulation-critical for battery-powered remote sensors. |
| Integrated Boot Recharge Diode | Eliminates external diode; reduces BOM count and layout complexity while enabling reliable 100% duty-cycle operation down to 3.5-V input. |
| Adjustable UVLO with Hysteresis | EN pin supports resistor-divider configuration to raise startup threshold above 2.5 V and add programmable hysteresis for brownout immunity. |
| Overvoltage Protection Lockout | Disables high-side MOSFET when VSENSE exceeds 109% of nominal and holds off until voltage drops below 107%-prevents downstream damage. |
| Frequency Foldback | Automatically reduces switching frequency during startup and overload to limit peak inductor current and improve fault recovery margin. |
Applications
| Industrial PLC I/O Module | Automotive Aftermarket GPS Tracker |
|---|---|
|
Use Scenario: Powers isolated CAN transceivers, analog input conditioners, and ARM Cortex-M4 MCU in DIN-rail mounted controllers operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3-V rail with PWRGD signaling to FPGA for safe boot sequence initiation. Use Value: 1.5-A capability handles transient surges from relay drivers; Eco-mode extends runtime during sleep cycles; MSOP PowerPAD ensures convection-cooled operation at 70°C ambient. |
Use Scenario: Supplies 3.3-V logic rail for GNSS module, cellular modem, and IMU in vehicle-mounted telematics units powered by 12-V battery with cold-crank dips. IC Role / Device Role / Timing Role: Input-stage regulator accepting 6–36-V unregulated battery input; SS/TR pin enables controlled power-up sequencing after ignition detection. Use Value: 42-V absolute max rating withstands load-dump transients; UVLO hysteresis prevents cycling during cranking; 116-μA QCC minimizes parasitic drain on parked vehicle battery. |
| Medical Point-of-Care Analyzer | Smart Building Sensor Node |
|
Use Scenario: Generates clean 3.3-V supply for precision ADCs, optical detectors, and BLE radio in portable diagnostic instruments with Li-ion backup. IC Role / Device Role / Timing Role: Main DC-DC converter with PWRGD used to validate rail integrity before enabling sensitive analog front-end calibration routines. Use Value: 0.8-V reference tolerance (±1.6%) ensures <±0.5% output accuracy; low-noise Eco-mode avoids interference with microvolt-level sensor signals. |
Use Scenario: Powers ultra-low-power MCU, environmental sensors, and LoRaWAN transceiver in battery-operated occupancy/lighting controls deployed in HVAC ducts. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in pulse-skip mode during 99% sleep time; EN pin controlled by MCU wake signal. Use Value: 1.3-μA shutdown current extends 10-year battery life; compact MSOP-10 footprint fits constrained PCB space; thermal pad enables passive cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 42-V, 1-A, 1.5-MHz fixed-frequency buck; no Eco-mode; higher 250-μA IQ; AEC-Q100 qualified. | Targeted for automotive infotainment displays where qualification matters more than ultra-low IQ. | Select LM5164QDDARQ1 only if AEC-Q100 compliance is mandatory and 1-A output suffices. |
| MP2451DT-LF-Z | 36-V, 0.6-A, 2-MHz buck; no PWRGD or SS/TR; 120-μA IQ; smaller SOT-23-6 package. | Suitable for space-constrained consumer electronics where sequencing and power-good are not required. | Choose MP2451DT-LF-Z when board area is critical and full feature set of TPS54140 is unnecessary. |
Compared with LM5164QDDARQ1 and MP2451DT-LF-Z, the TPS54140 uniquely combines 1.5-A output, Eco-mode efficiency, PWRGD signaling, and SS/TR sequencing in a single MSOP-10 package-making it optimal for industrial and medical systems demanding reliability, flexibility, and low standby consumption.
Availability
TPS54140 is available at Aetrix Electronics and suitable for industrial PLCs, automotive telematics, medical analyzers, and smart building sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for TPS54140 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 TPS54140 belongs to TI's SWIFT™ family of high-voltage buck converters, engineered specifically for rugged industrial and automotive power supplies needing wide VIN range, high efficiency at light loads, and robust protection features.
FAQ
What is the minimum input voltage required for TPS54140 to start switching?
The TPS54140 has an internal undervoltage lockout threshold of 2.5 V, but actual startup depends on external EN pin configuration. With EN floating, startup occurs when VIN exceeds ~2.5 V. If EN is biased with resistors, the effective start voltage increases-for example, a 100-kΩ/49.9-kΩ divider raises startup to ~7.7 V with hysteresis. The TPS54140 datasheet specifies these values under "Start Input Voltage" in Section 7.3.
Can TPS54140 operate with 100% duty cycle, and what limits this capability?
Yes, the TPS54140 supports 100% duty cycle as long as the BOOT–PH voltage remains above 2.1 V. This is enforced by an internal boot UVLO circuit. When BOOT–PH drops below 2.1 V-due to insufficient input-output differential or inadequate boot capacitor recharge-the high-side MOSFET turns off, allowing the low-side path to refresh the BOOT capacitor. The TPS54140's architecture enables dropout operation down to VIN ≈ VOUT + 2.1 V.
How does the Eco-mode™ function affect TPS54140 efficiency at light loads?
Eco-mode™ enables pulse-skipping operation below ~200 mA load, reducing switching losses and lowering quiescent current to 116 μA. This boosts light-load efficiency-e.g., >85% at 10 mA with 12-V input and 3.3-V output-while maintaining output voltage regulation within ±1%. The TPS54140 automatically transitions between PWM and Eco-mode based on load current without external control.
What is the purpose of the SS/TR pin on TPS54140, and how is it configured for sequencing?
The SS/TR pin controls output voltage ramp time and enables power-supply sequencing. For slow start, connect a capacitor (e.g., 10 nF) from SS/TR to GND; ramp time scales linearly with capacitance. For sequencing, tie SS/TR to another rail's output via resistor divider so TPS54140 tracks that voltage. During faults, the TPS54140 actively discharges SS/TR to ensure repeatable restart-documented in Section 8.3.5 of the datasheet.
Does TPS54140 require an external bootstrap diode, and why or why not?
No, the TPS54140 integrates the bootstrap recharge diode internally, eliminating the need for an external component. This simplifies layout, reduces BOM cost, and improves reliability. The internal diode charges the BOOT capacitor during the PH low phase. A 0.1-μF X7R ceramic capacitor between BOOT and PH is still required per the TPS54140 datasheet recommendations in Section 8.3.3.
TPS54140DGQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Eco-Mode™
- Package/Case:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
TPS54140DGQ FAQ
1.How can I place an order for TPS54140DGQ through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54140DGQ 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 TPS54140DGQ reliable?
The price and inventory of TPS54140DGQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54140DGQ is usually 5 days.
3.What payment methods are accepted for TPS54140DGQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54140DGQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54140DGQ?
TPS54140DGQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54140DGQ 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 TPS54140DGQ?
For technical support, including TPS54140DGQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54140DGQ requirements.
6.How does Aetrix verify that TPS54140DGQ is sourced from the original manufacturer or authorized distributors?
All TPS54140DGQ 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 TPS54140DGQ meets industry standards.
7.What is the process for return or replacement of TPS54140DGQ?
All TPS54140DGQ units undergo pre-shipment inspection (PSI). If there is an issue with TPS54140DGQ, 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 TPS54140DGQ part is unused and in its original packaging.
Return procedure for TPS54140DGQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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