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Texas Instruments TPS54540BDDAR
- Part No.:
- TPS54540BDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54540BDDAR.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:5,228
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Product details
Overview
TPS54540BDDAR 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 to 2.5-MHz switching frequency. It delivers regulated 0.8-V to 41.1-V output in industrial power supplies, USB charging ports, and 12-V/24-V communications systems.
For engineers reviewing the TPS54540BDDAR datasheet, TPS54540BDDAR pinout, TPS54540BDDAR application, or TPS54540BDDAR equivalent, key selection criteria include input voltage range (4.5–42 V), continuous output current (5 A), quiescent current (146 µA), thermal shutdown (176 °C), and HSOIC-8 PowerPAD™ package compatibility with board-level thermal management.
Technical Context
The TPS54540BDDAR implements current-mode control with internal slope compensation to prevent sub-harmonic oscillation above 50% duty cycle. Its transconductance error amplifier (350 µA/V) drives the PWM comparator via the COMP pin, while the RT/CLK pin supports both resistor-programmed frequency and external clock synchronization via PLL.
It integrates BOOT capacitor recharge logic and BOOT-SW UVLO (2.1 V threshold) to sustain near-100% duty cycle operation during low-dropout conditions. Overvoltage protection triggers at 106% of nominal output, and frequency foldback activates during start-up and overcurrent faults to maintain inductor current control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - Supports wide industrial input rails including 12 V, 24 V, and transient-tolerant 36 V systems. |
| Output Current | 5 A continuous - Delivers full rated load without derating at TJ ≤ 125 °C with proper PCB thermal design. |
| Switching Frequency | 100 kHz to 2.5 MHz - Adjustable via RT resistor or external clock; enables optimization of efficiency vs. size of inductors/capacitors. |
| Quiescent Current | 146 µA - Enables high light-load efficiency in battery-backed or always-on systems via Eco-mode™ pulse skipping. |
| Reference Voltage | 0.8 V ±1% - Sets minimum output voltage; used with FB resistor divider to configure precise output regulation. |
| High-Side RDS(on) | 92 mΩ typical - Reduces conduction loss; enables high-efficiency 5-A conversion with minimal external heatsinking. |
| Thermal Shutdown | 176 °C with 12 °C hysteresis - Protects device under sustained overload or poor thermal layout; allows safe recovery after cooling. |
Pinout & Package
TPS54540BDDAR uses an 8-pin HSOIC package with exposed PowerPAD™ thermal pad (4.89 mm × 3.90 mm body). The PowerPAD must be soldered to a large copper area connected to GND for effective heat dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects to SW via 0.1-µF ceramic capacitor; supplies gate drive for high-side MOSFET; monitored for UVLO. |
| VIN | Main input supply | Accepts 4.5–42 V; powers internal circuitry and high-side driver; requires local 10-µF ceramic input capacitance. |
| GND | Power and signal reference | Common return for all circuits; must connect directly to PowerPAD and low-impedance ground plane. |
| SW | Switching node | Drain of internal high-side MOSFET; connects to inductor and BOOT capacitor; carries high di/dt pulses. |
| FB | Feedback input | Inverting input of error amplifier; senses output via resistor divider; sets regulated output voltage (VOUT = 0.8 V × (1 + R1/R2)). |
| COMP | Error amplifier output | Drives PWM comparator; connects to external compensation network (capacitor/resistor/capacitor) for loop stability. |
| EN | Enable control | Pull below 1.2 V to disable; internal 1.2-µA pullup enables floating operation; supports adjustable UVLO with two resistors. |
| RT/CLK | Frequency programming | Resistor-to-GND sets fSW (100–2500 kHz); pulled above 1.55 V to enter external clock sync mode (160–2300 kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces no-load input current to 146 µA by disabling switching when load is light-critical for energy-sensitive applications. |
| Integrated BOOT recharge FET | Eliminates need for external bootstrap diode; enables >95% duty cycle operation and simplifies layout in low-VIN-to-VOUT designs. |
| Adjustable UVLO with hysteresis | EN pin supports custom start/stop thresholds (e.g., 12 V start, 10.5 V stop) using two resistors-prevents brownout oscillation in unstable supplies. |
| Overvoltage protection (OVP) | Shuts off high-side MOSFET if output exceeds 106% of setpoint-protects downstream loads from fault-induced overvoltage stress. |
| Internal soft-start | 2.1-ms (at 500 kHz) controlled ramp prevents inrush current and output overshoot-reduces stress on input capacitors and load circuitry. |
Applications
| Industrial Motor Control | USB Dedicated Charging Port |
|---|---|
Use Scenario: Powering microcontrollers, gate drivers, and sensors in PLC I/O modules operating from 24-V DC rails with wide input transients. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V point-of-load regulator delivering stable 5-A output with high PSRR and fast transient response. Use Value: 92-mΩ RDS(on) and current-mode control enable <1% output deviation under 5-A step load changes; Eco-mode maintains <200-µA standby draw during idle cycles. | Use Scenario: Providing BC1.2-compliant 5-V/1.5-A charging output from automotive 12-V or industrial 24-V sources. IC Role / Device Role / Timing Role: Constant-voltage buck converter with tight 0.8-V reference tolerance (±1%) ensuring accurate 5.0-V USB output regulation. Use Value: Adjustable UVLO prevents startup until input stabilizes above 9 V; OVP protects connected devices from accidental 12-V short-circuit feedback. |
| 12-V Industrial Power System | 24-V Communications Equipment |
Use Scenario: Generating isolated 3.3-V or 5-V rails for Ethernet PHYs and FPGA configuration in factory automation controllers. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter operating at 800 kHz to minimize EMI in noise-sensitive communication subsystems. Use Value: 100–2500 kHz frequency adjustability allows EMI band avoidance; PowerPAD package achieves 23.4 °C/W θJB for reliable 5-A operation on 2-layer boards. | Use Scenario: Powering PoE midspans, base station radios, and remote radio units fed from 24-V or 36-V backup batteries. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting cold-crank (4.5 V) to load-dump (42 V) conditions while maintaining 5-A output. Use Value: Thermal shutdown (176 °C) and frequency foldback protect during prolonged overloads; 146-µA quiescent current extends battery runtime in standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143ARGFR | 42-V, 3-A dual-channel synchronous buck; higher integration (dual phase, current sharing); 2.2-MHz max fSW; 100-µA IQ. | Targeted at multi-rail systems requiring coordinated sequencing; not single-output optimized like TPS54540BDDAR. | Select LM5143ARGFR only when dual-output capability, channel interleaving, or lower IQ are required-avoid for simple 5-A single-rail designs. |
| MP2451DT-LF-Z | 36-V, 0.6-A buck; smaller HSOIC-8 package; fixed 500-kHz fSW; no Eco-mode; 1.2-V ref; 300-mΩ RDS(on). | Designed for low-power auxiliary rails-not suitable for 5-A loads due to current and thermal limits. | MP2451DT-LF-Z is not a functional replacement; use only for sub-1-A applications where cost and footprint outweigh performance needs. |
Compared with LM5143ARGFR and MP2451DT-LF-Z, the TPS54540BDDAR uniquely balances 5-A output, wide 4.5–42-V input, Eco-mode efficiency, and HSOIC-8 thermal performance-making it optimal for single-rail industrial and charging applications where size, cost, and reliability are co-prioritized.
Availability
TPS54540BDDAR is available at Aetrix Electronics and suitable for industrial motor control, USB charging infrastructure, and 12-V/24-V communications equipment requiring stable component supply across long production lifecycles.
Supply support for TPS54540BDDAR 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 power conversion solutions.
The TPS54540BDDAR belongs to TI's SWIFT™ family of integrated DC/DC converters, designed specifically for rugged industrial and automotive power systems demanding wide input range, high current, and robust thermal performance.
FAQ
What is the maximum continuous output current of the TPS54540BDDAR?
The TPS54540BDDAR delivers 5 A continuous output current under recommended operating conditions (TJ ≤ 125 °C, adequate PCB copper area for PowerPAD thermal dissipation). Derating applies above 125 °C junction temperature per the thermal characteristics table in the datasheet. Peak current limit is 6.3–9.5 A depending on VIN and temperature.
Does the TPS54540BDDAR support external clock synchronization?
Yes, the TPS54540BDDAR supports external clock synchronization via the RT/CLK pin. When pulled above 1.55 V, the pin enters CLK mode and accepts external clock signals from 160 kHz to 2.3 MHz. The internal PLL locks to the falling edge of the input clock, enabling precise timing alignment in multi-converter systems.
How does Eco-mode™ improve light-load efficiency in the TPS54540BDDAR?
Eco-mode™ in the TPS54540BDDAR reduces switching activity at light loads by entering pulse-skipping mode when peak switch current falls below ~600 mV COMP threshold. This lowers no-load input current to 146 µA, significantly improving efficiency in standby or intermittent-operation applications without compromising regulation accuracy.
What is the purpose of the BOOT pin on the TPS54540BDDAR?
The BOOT pin on the TPS54540BDDAR provides gate drive voltage to the internal high-side MOSFET via a capacitor connected between BOOT and SW. It is actively refreshed by an integrated low-side FET during SW low-time, enabling high-duty-cycle operation and eliminating the need for an external bootstrap diode.
Can the TPS54540BDDAR operate with input voltages below 4.5 V?
No-the TPS54540BDDAR has a specified minimum input voltage of 4.5 V per absolute maximum and recommended operating conditions. Attempting operation below this risks failure to start, unstable regulation, or damage due to insufficient gate drive and internal bias voltage. For sub-4.5-V inputs, consider TI's TPS543x or TPS628xx families.
TPS54540BDDAR 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:
- Active
- 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:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54540BDDAR FAQ
1.How can I place an order for TPS54540BDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54540BDDAR 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 TPS54540BDDAR reliable?
The price and inventory of TPS54540BDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54540BDDAR is usually 5 days.
3.What payment methods are accepted for TPS54540BDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54540BDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54540BDDAR?
TPS54540BDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54540BDDAR 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 TPS54540BDDAR?
For technical support, including TPS54540BDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54540BDDAR requirements.
6.How does Aetrix verify that TPS54540BDDAR is sourced from the original manufacturer or authorized distributors?
All TPS54540BDDAR 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 TPS54540BDDAR meets industry standards.
7.What is the process for return or replacement of TPS54540BDDAR?
All TPS54540BDDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54540BDDAR, 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 TPS54540BDDAR part is unused and in its original packaging.
Return procedure for TPS54540BDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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