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Texas Instruments TPS54040ADGQR
- Part No.:
- TPS54040ADGQR
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS54040ADGQR.pdf
- Description:
- IC REG BUCK ADJ 500MA 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,891
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Product details
Overview
TPS54040ADGQR from Texas Instruments is a 42-V, 0.5-A synchronous step-down DC-DC converter with integrated 200-mΩ high-side MOSFET, Eco-Mode™ pulse-skipping at light loads (116 μA quiescent current), adjustable 100 kHz–2.5 MHz switching frequency via RT/CLK pin, and precision 0.8-V internal reference. It delivers regulated 3.3 V or 5.0 V output in industrial power supplies requiring wide VIN range and low-noise operation.
For engineers reviewing the TPS54040ADGQR datasheet, TPS54040ADGQR pinout, TPS54040ADGQR application, or TPS54040ADGQR equivalent, key selection considerations include its 3.5–42 V input range, 0.5-A continuous output capability, integrated boot diode, PWRGD open-drain power-good signal, and MSOP-10 PowerPAD package thermal performance.
Technical Context
The TPS54040ADGQR employs peak current-mode control with slope compensation to ensure stability across full duty cycle range, including 100% operation during dropout. Its internal PLL on the RT/CLK pin enables synchronization to external clocks or resistor-set frequency tuning between 100 kHz and 2.5 MHz.
It integrates a transconductance error amplifier (97 μA/V typical gm), BOOT UVLO protection (2.1 V threshold), and an overload recovery circuit that discharges the SS/TR capacitor during faults-enabling repeatable restart after thermal shutdown or UVLO events without external reset logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 42 V - supports 12 V and 24 V industrial bus rails, automotive battery transients, and wide-input off-line auxiliary supplies. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained 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., 4.7 μH at 500 kHz) and EMI filtering while maintaining efficiency. |
| Reference Voltage | 0.8 V ±2% - sets accurate output voltage via external resistor divider; enables 3.3 V, 5.0 V, or custom outputs down to 0.8 V. |
| High-Side RDS(on) | 200 mΩ at 12 V BOOT-PH - reduces conduction loss and improves full-load efficiency up to 92% (typical at 5 V/0.5 A). |
| Power-Good Threshold | 94% to 107% of VOUT - provides reliable system sequencing and fault detection without external comparators. |
Pinout & Package
TPS54040ADGQR is housed in a thermally enhanced MSOP-10 PowerPAD package (3.0 mm × 3.0 mm), where the exposed thermal pad must be soldered to PCB ground plane for optimal θJB = 28°C/W thermal performance and sustained 0.5-A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BOOT | Bootstrap supply node | Drives high-side MOSFET gate; requires 0.1-μF X7R ceramic cap to PH; UVLO disables switch if BOOT-PH < 2.1 V. |
| 2 VIN | Main input supply | Accepts 3.5–42 V; powers internal bias circuits and high-side driver; decoupling required within 5 mm of pin. |
| 3 EN | Enable / UVLO control | Pull <1.25 V to disable; internal pull-up enables floating operation; external resistors adjust UVLO threshold and hysteresis. |
| 4 SS/TR | Slow-start / tracking input | Capacitor sets soft-start time; voltage override enables supply sequencing; discharged during overload for controlled restart. |
| 5 RT/CLK | Frequency set / sync input | Resistor-to-ground sets fSW; pulled above 2.2 V to enter PLL sync mode; supports external clock input up to 2.2 MHz. |
| 6 PWRGD | Open-drain power-good output | Asserts low when VSENSE <92% or >109% of target; deasserts (high-Z) when within 94–107%; requires external pull-up. |
| 7 VSENSE | Feedback sense input | Inverting input of error amp; compares output divider voltage to 0.8-V reference; max 10-μA input bias current. |
| 8 COMP | Error amplifier output | Drives PWM comparator; connects to Type II/III compensation network; gm = 97 μA/V (normal), 25 μA/V (slow-start). |
| 9 GND | Analog/digital ground | Common return for feedback, control, and power paths; tied to thermal pad; must be low-impedance star point. |
| 10 PH | Power switch source | Source terminal of internal high-side MOSFET; connects to inductor and bootstrap capacitor; carries full load current. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-Mode™ Pulse Skipping | Reduces no-load input current to 116 μA by skipping switching cycles-critical for battery-powered applications with intermittent wake-up. |
| Integrated Boot Diode | Eliminates external Schottky diode; reduces BOM count and layout area while maintaining efficient boot capacitor recharge during low-side conduction. |
| Adjustable UVLO with Hysteresis | EN pin supports programmable start/stop thresholds (e.g., 12 V ±0.5 V) using two resistors-prevents brownout oscillation in unstable input conditions. |
| Overload Recovery Circuit | Automatically discharges SS/TR capacitor during overcurrent or thermal fault-ensures deterministic restart at fault voltage, not full rail. |
| Frequency Foldback | Reduces fSW during startup and overload to limit peak inductor current and prevent saturation-improves reliability under short-circuit stress. |
Applications
| Industrial Power Supply | Automotive Aftermarket Module |
|---|---|
|
Use Scenario: Regulating 24 V vehicle battery to 5 V for GPS navigation module with cold-crank immunity. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, sequenced 5 V rail with PWRGD confirmation before MCU boot. Use Value: 42 V absolute max rating withstands load-dump transients; Eco-Mode™ extends runtime during parking mode. |
Use Scenario: Powering dual-core ARM processor and HDMI transmitter in aftermarket infotainment head unit. IC Role / Device Role / Timing Role: Main 3.3 V supply with SS/TR-controlled ramp to meet processor power-on reset timing requirements. Use Value: Adjustable UVLO prevents erratic behavior during engine cranking; 0.5-A rating supports burst-mode video processing loads. |
| IoT Sensor Node | Programmable Logic Controller (PLC) I/O Module |
|
Use Scenario: Battery-backed environmental sensor node operating 10+ years on AA cells. IC Role / Device Role / Timing Role: Always-on 3.3 V regulator with ultra-low quiescent current and precise enable threshold for wake-on-event. Use Value: 116 μA QIQ enables multi-year shelf life; EN hysteresis rejects noise-induced false wakeups. |
Use Scenario: Isolated 5 V supply for digital I/O expansion card in DIN-rail mounted PLC chassis. IC Role / Device Role / Timing Role: Secondary buck stage deriving 5 V from 24 V backplane, synchronized to system clock via RT/CLK pin. Use Value: External clock sync eliminates beat-frequency EMI; MSOP-10 PowerPAD ensures thermal stability in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 42 V, 0.6 A, 100 kHz–2.2 MHz; higher current, AEC-Q100 qualified; no Eco-Mode™; 95 μA IQ | Automotive-grade replacement requiring qualification documentation; lacks pulse-skipping for lowest IQ | Choose for automotive production where AEC-Q100 compliance is mandatory and 0.6 A is needed. |
| TPS54240DGQR | 42 V, 2 A, same pinout/package; higher current; 140 μA IQ; identical feature set except current rating | Drop-in upgrade path when load increases beyond 0.5 A; shares same layout and compensation design | Choose when future-proofing for higher current or designing scalable platform with shared PCB footprint. |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, the TPS54040ADGQR offers the lowest quiescent current in its class (116 μA) and unique Eco-Mode™ for ultra-low-power applications, while retaining full pin compatibility with the TPS54x40 family for seamless design reuse.
Availability
TPS54040ADGQR is available at Aetrix Electronics and suitable for industrial power supplies, automotive aftermarket modules, IoT sensor nodes, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for TPS54040ADGQR 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-reliability DC-DC conversion.
The TPS54040A product line delivers compact, high-efficiency buck regulators for industrial, automotive, and battery-powered systems where wide input range, low IQ, and robust fault protection are critical.
FAQ
What is the minimum input voltage required for TPS54040ADGQR to start regulation?
The TPS54040ADGQR has an internal undervoltage lockout threshold of 2.5 V, below which the device remains disabled. However, with external resistors on the EN pin, the effective start voltage can be increased-for example, to 9 V for automotive applications. Startup occurs when VIN exceeds this adjusted threshold, and the output begins ramping only after the SS/TR capacitor charges to match the 0.8-V reference.
Can TPS54040ADGQR operate at 100% duty cycle, and under what conditions?
Yes, the TPS54040ADGQR supports 100% duty cycle operation as long as the BOOT-to-PH voltage remains above 2.1 V. This enables dropout operation down to VOUT + 2.1 V. If BOOT-PH falls below 2.1 V, the high-side MOSFET is disabled until the capacitor recharges-making it suitable for high-input, low-output ratio designs like 24 V to 3.3 V conversion.
How does the Eco-Mode™ in TPS54040ADGQR reduce power consumption at light loads?
Eco-Mode™ in the TPS54040ADGQR skips switching cycles when load current drops below ~10 mA, maintaining regulation while reducing average switching losses. This lowers the no-load input current to 116 μA-enabling multi-year operation in battery-powered applications such as wireless sensor nodes or smart meters where standby power is critical.
What is the purpose of the SS/TR pin on TPS54040ADGQR, and how is it used for power sequencing?
The SS/TR pin on TPS54040ADGQR controls output voltage ramp rate via an external capacitor (soft-start) or accepts a voltage reference from another supply (tracking). For sequencing, connect SS/TR of a secondary regulator to the PWRGD or VOUT of a primary supply-ensuring orderly power-up across multiple rails without external timers or supervisors.
Does TPS54040ADGQR require an external bootstrap diode, and why or why not?
No, the TPS54040ADGQR integrates the bootstrap diode internally, eliminating the need for an external Schottky diode. This simplifies layout, reduces component count, and improves reliability-especially in high-vibration environments like automotive or industrial settings-while maintaining efficient boot capacitor recharge during the low-side conduction phase.
TPS54040ADGQR 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:
- 500mA
- 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
TPS54040ADGQR FAQ
1.How can I place an order for TPS54040ADGQR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54040ADGQR 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 TPS54040ADGQR reliable?
The price and inventory of TPS54040ADGQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54040ADGQR is usually 5 days.
3.What payment methods are accepted for TPS54040ADGQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54040ADGQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54040ADGQR?
TPS54040ADGQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54040ADGQR 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 TPS54040ADGQR?
For technical support, including TPS54040ADGQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54040ADGQR requirements.
6.How does Aetrix verify that TPS54040ADGQR is sourced from the original manufacturer or authorized distributors?
All TPS54040ADGQR 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 TPS54040ADGQR meets industry standards.
7.What is the process for return or replacement of TPS54040ADGQR?
All TPS54040ADGQR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54040ADGQR, 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 TPS54040ADGQR part is unused and in its original packaging.
Return procedure for TPS54040ADGQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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