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Texas Instruments TPS54540DDAR
- Part No.:
- TPS54540DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54540DDAR.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,687
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Product details
Overview
TPS54540 from Texas Instruments is a 4.5 V to 42 V input, 5 A synchronous step-down DC-DC converter with integrated 92 mΩ high-side MOSFET, Eco-mode™ pulse-skipping for light-load efficiency, and adjustable 100 kHz–2.5 MHz switching frequency. It delivers regulated 0.8 V to 41.1 V output in industrial power systems, automotive accessories, and USB charging ports.
For engineers reviewing the TPS54540 datasheet, TPS54540 pinout, TPS54540 application, or TPS54540 equivalent, key selection considerations include its 146 μA no-load quiescent current, internal 0.8 V ±1% reference, BOOT-recharge FET integration, EN-adjustable UVLO, and thermal shutdown with 176°C trip point.
Technical Context
The TPS54540 implements constant-frequency current-mode control with slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its transconductance error amplifier (350 μ℧ typical) drives the PWM comparator via the COMP pin, with soft-start ramping FB voltage to limit inrush.
It features an internal PLL on the RT/CLK pin enabling synchronization to external clocks (160–2300 kHz) or resistor-programmed operation (100–2500 kHz). The BOOT-SW UVLO circuit monitors bootstrap capacitor health, while frequency foldback protects during overloads by reducing fSW before thermal shutdown at 176°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports 12 V/24 V automotive and industrial rails; survives ISO 7637 load dump pulses up to 45 V. |
| Output Current | 5 A continuous - enabled by integrated 92 mΩ high-side MOSFET and thermally enhanced HSOP PowerPAD™ package. |
| Quiescent Current | 146 μA (no-switching) / 2 μA (shutdown) - enables always-on systems with minimal battery drain. |
| Feedback Reference | 0.8 V ±1% - sets minimum output voltage; used with external resistor divider for adjustable regulation. |
| Switching Frequency | 100 kHz to 2.5 MHz - selectable via RT resistor or external clock; higher frequencies reduce inductor size but increase switching loss. |
| Current Limit Threshold | 7.5 A typical (open-loop) - cycle-by-cycle protection independent of inductor value; folds back frequency during overload. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive and industrial environments with full parameter guarantees. |
Pinout & Package
TPS54540 uses an 8-terminal HSOP (DDAR) package with exposed thermal pad (PowerPAD™), measuring 4.89 mm × 3.9 mm. The pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects external capacitor between BOOT and SW to gate-drive high-side MOSFET; monitored by internal UVLO. |
| VIN | Main power input | Supplies IC bias and high-side driver; accepts 4.5–42 V with internal UVLO at 4.3 V (adjustable via EN). |
| EN | Enable & UVLO control | Pull below 1.2 V to disable; float or pull high to enable; configure resistive divider to raise UVLO threshold. |
| RT/CLK | Frequency programming/sync input | Resistor-to-ground sets fSW; >2 V input switches to external clock sync mode with PLL lock. |
| FB | Feedback sensing input | Inverting input of error amplifier; compares divided output voltage against 0.8 V reference for regulation. |
| COMP | Error amplifier output | Drives PWM comparator; connect RC network here for loop compensation and stability. |
| GND | Analog/digital ground | Reference for internal circuits; must be low-impedance connection to PCB ground plane. |
| SW | Switching node | Source of internal high-side MOSFET and drain of external low-side diode/switch; high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces light-load switching losses by clamping COMP at 600 mV; maintains >85% efficiency at 10 mA output. |
| Integrated BOOT recharge FET | Eliminates external diode; enables 100% duty cycle capability and simplifies layout for high-VIN/VOUT ratios. |
| Adjustable UVLO with hysteresis | EN pin supports resistor-divider configuration; 325 mV hysteresis prevents chatter near threshold. |
| Internal soft-start | 2.1 ms (at 500 kHz) controlled ramp on FB voltage; limits inrush current and eliminates output overshoot. |
| Overvoltage transient protection | OVP comparator disables high-side switch if VOUT exceeds 106% of setpoint; recovers automatically when safe. |
Applications
| Automotive GPS & Infotainment | Industrial Motor Drive Power |
|---|---|
|
Use Scenario: Regulating 12 V vehicle battery to stable 5 V/3.3 V for navigation processors and display controllers. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic power; handles load dump transients per ISO 7637. Use Value: 45 V absolute max rating and 176°C thermal shutdown ensure reliability in under-hood temperature cycling. |
Use Scenario: Generating isolated gate drive and logic supply from 24 V PLC bus for IGBT/SiC drivers. IC Role / Device Role / Timing Role: Non-isolated intermediate rail converter; synchronized via RT/CLK to system clock for EMI control. Use Value: 2.5 MHz max fSW allows compact 1.0 μH inductors; 92 mΩ RDS(on) minimizes conduction loss at 5 A. |
| USB Dedicated Charging Port (DCP) | 12 V/24 V Communications Equipment |
|
Use Scenario: Providing 5 V @ 2.4 A to USB Type-A ports in vehicle docking stations or PoE-powered hubs. IC Role / Device Role / Timing Role: Constant-voltage buck stage preceding USB PD negotiation; supports wide input for dual-battery backup. Use Value: 146 μA quiescent current extends standby time; Eco-mode maintains >90% efficiency down to 50 mA load. |
Use Scenario: Converting 24 V telecom rack supply to 12 V/5 V for FPGA, PHY, and memory subsystems. IC Role / Device Role / Timing Role: Point-of-load regulator with programmable fSW to avoid noise coupling into sensitive analog receivers. Use Value: Adjustable UVLO prevents brownout restarts during line sag; 0.8 V reference enables precise 1.2 V DDR termination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQPWPRQ1 | 42 V, 3 A, dual-channel, AEC-Q100 qualified; lower current rating, no Eco-mode, higher 2.1 mA IQ. | Better suited for space-constrained dual-rail automotive clusters; lacks pulse-skip efficiency at microamp loads. | Select when dual-output coordination or ASIL-B compliance is required over single-rail light-load efficiency. |
| MP2451DT-LF-Z | 36 V, 0.6 A, 2 MHz fixed fSW, 2.5 μA shutdown IQ; smaller current, no UVLO adjustment, no sync capability. | Targeted at low-power IoT sensors; insufficient for 5 A motor control or USB charging use cases. | Choose only for cost-sensitive, low-current (<1 A) applications where programmability and robustness are secondary. |
Compared with LM5143AQPWPRQ1 and MP2451DT-LF-Z, the TPS54540 uniquely balances 5 A output, 146 μA light-load IQ, adjustable UVLO, and full 100 kHz–2.5 MHz programmability-making it optimal for high-reliability, wide-input industrial and automotive buck stages where both peak current and standby efficiency matter.
Availability
TPS54540 is available at Aetrix Electronics and suitable for industrial motor control, automotive infotainment, and USB charging port designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for TPS54540 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 automotive and industrial qualification expertise.
The TPS54540 belongs to TI's SWIFT™ family of high-voltage buck regulators, engineered specifically for rugged 12 V/24 V/42 V systems demanding high efficiency, thermal resilience, and transient robustness in harsh environments.
FAQ
What is the absolute maximum input voltage rating for the TPS54540?
The TPS54540 has an absolute maximum input voltage of 45 V, allowing it to survive ISO 7637-2 load dump pulses common in automotive 12 V systems. Its recommended operating range remains 4.5 V to 42 V; exceeding 45 V risks permanent damage per the datasheet's Absolute Maximum Ratings table.
Does the TPS54540 require an external bootstrap diode?
No, the TPS54540 does not require an external bootstrap diode. It integrates a BOOT recharge FET that automatically refreshes the BOOT-to-SW capacitor during low-side conduction, enabling high-duty-cycle operation and eliminating one external component versus discrete bootstrap solutions.
How is the switching frequency set on the TPS54540?
The TPS54540 switching frequency is set either by connecting a resistor from RT/CLK to GND (100 kHz–2.5 MHz range) or by applying an external clock signal to RT/CLK (160 kHz–2.3 MHz). The internal PLL locks to the external clock; if the clock stops, it reverts to resistor mode automatically.
What is the purpose of the COMP pin on the TPS54540?
On the TPS54540, the COMP pin is the output of the transconductance error amplifier and serves as the control input to the PWM comparator. External RC compensation components are connected here to stabilize the feedback loop, directly affecting phase margin, transient response, and load-step performance.
Can the TPS54540 operate with a 0.8 V output voltage?
Yes, the TPS54540 can regulate down to 0.8 V - its internal voltage reference - by connecting the FB pin directly to the output. For higher outputs, a resistor divider scales the output voltage to match the 0.8 V reference; the device guarantees ±1% reference accuracy over temperature and line.
TPS54540DDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Eco-Mode™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Split Rail
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 41.1V
- Current - Output:
- 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:
- 8-SO PowerPad
TPS54540DDAR FAQ
1.How can I place an order for TPS54540DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54540DDAR 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 TPS54540DDAR reliable?
The price and inventory of TPS54540DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54540DDAR is usually 5 days.
3.What payment methods are accepted for TPS54540DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54540DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54540DDAR?
TPS54540DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54540DDAR 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 TPS54540DDAR?
For technical support, including TPS54540DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54540DDAR requirements.
6.How does Aetrix verify that TPS54540DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54540DDAR 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 TPS54540DDAR meets industry standards.
7.What is the process for return or replacement of TPS54540DDAR?
All TPS54540DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54540DDAR, 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 TPS54540DDAR part is unused and in its original packaging.
Return procedure for TPS54540DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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