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Texas Instruments TPS54540BQDDARQ1
- Part No.:
- TPS54540BQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54540BQDDARQ1.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 8SOPWR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS54540BQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 4.5-V to 42-V input, 5-A synchronous step-down DC-DC converter with integrated 92-mΩ high-side MOSFET, 0.8-V ±1% internal reference, and Eco-mode™ pulse-skipping for light-load efficiency. It operates across –40°C to 150°C junction temperature and supports load-dump survival up to 65 V per ISO 7637 in vehicle power systems.
For engineers reviewing the TPS54540BQDDARQ1 datasheet, TPS54540BQDDARQ1 pinout, TPS54540BQDDARQ1 application, or TPS54540BQDDARQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and ESD specs (H1C/HBM, C3B/CDM), real-world efficiency curves at 12/36/60 V input, and precise selection guidance against functionally aligned alternatives.
Technical Context
The TPS54540BQDDARQ1 implements current-mode control with adjustable 100-kHz–2.5-MHz switching frequency via RT/CLK resistor or external clock synchronization. Its integrated BOOT recharge FET enables low-dropout operation near 100% duty cycle while maintaining stable gate drive through automatic capacitor refresh.
It features a transconductance error amplifier (350 µS typical) with soft-start-controlled gain reduction (77 µS), cycle-by-cycle current limiting (7.9 A typ), thermal shutdown at 176°C with 12°C hysteresis, and precision UVLO with adjustable threshold via EN pin resistor divider - all within a thermally enhanced 8-pin HSOP PowerPAD™ package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide automotive battery rail variations including cold-crank (4.5 V) and load-dump transients (survives 65 V per ISO 7637). |
| Output Current | 5 A continuous - delivers full rated current with integrated 92-mΩ high-side MOSFET and thermal design optimized for HSOP PowerPAD™. |
| Switching Frequency | 100 kHz to 2.5 MHz - adjustable via RT resistor or external clock; enables optimization of efficiency vs. size for output filter components. |
| Quiescent Current | 146 µA operating / 2 µA shutdown - enables always-on subsystems with minimal battery drain in automotive sleep modes. |
| Reference Voltage | 0.8 V ±1% - provides accurate output regulation across –40°C to 150°C junction temperature range. |
| UVLO Threshold | 4.3 V (rising), 3.975 V (falling) - internally set with 325 mV hysteresis; externally adjustable via EN pin resistor network. |
| Thermal Protection | 176°C shutdown with 12°C hysteresis - prevents damage during overload or poor heatsinking; junction-to-board RθJB = 22.6°C/W. |
Pinout & Package
TPS54540BQDDARQ1 uses an 8-pin HSOP (DDA) package with exposed PowerPAD™ thermal pad (4.89 mm × 3.90 mm body size). The PowerPAD must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 4.5–42 V DC; withstands 65 V transient per ISO 7637; decoupling required near pin. |
| EN | Enable control input | Pull below 1.2 V to disable; internal 1.2 µA pullup enables floating operation; supports adjustable UVLO with resistor divider. |
| RT/CLK | Frequency programming/sync input | Resistor-to-ground sets fSW (100 kHz–2.5 MHz); pulled above 1.55 V to enter PLL sync mode with external clock. |
| COMP | Error amplifier output | Connects to compensation network (R-C-R-C); controls PWM comparator; clamped at 600 mV in Eco-mode. |
| FB | Feedback sensing input | Inverting input of gm error amp; compares output voltage (via resistor divider) to 0.8 V reference for regulation. |
| GND | Power and signal ground | Common return path; connects to PowerPAD for thermal conduction and low-impedance grounding. |
| BOOT | High-side gate drive supply | Requires 0.1 µF ceramic capacitor to SW; integrated recharge FET enables >99% duty cycle operation. |
| SW | Switch node | Drain of internal high-side MOSFET; connects to external inductor and BOOT capacitor; high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces no-load quiescent current to 146 µA by disabling switching when load is light - critical for automotive always-on modules. |
| Integrated BOOT recharge FET | Enables stable operation at ultra-high duty cycles (>99%) without external diode; eliminates need for discrete bootstrap circuitry. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation with H1C (±2 kV HBM) and C3B (±750 V CDM) ESD robustness - meets automotive reliability standards. |
| Current-mode control with slope compensation | Ensures stability at >50% duty cycle; simplifies loop compensation and improves transient response over voltage-mode designs. |
| Overvoltage protection (OVP) | Shuts off high-side MOSFET if output exceeds 106% of setpoint - prevents damage to downstream 3.3 V or 5 V logic rails. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers display controllers, audio codecs, and USB interfaces in automotive head units with variable battery input (6–16 V) and strict EMI limits. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V/5 V from 12 V battery rail; manages startup sequencing and load-dump immunity. Use Value: Eco-mode™ maintains <150 µA quiescent current during standby; integrated BOOT FET ensures clean 100% duty cycle during cold-crank dips. |
Use Scenario: Supplies image sensor, ISP, and serializer in forward-facing camera systems requiring low noise, fast transient response, and AEC-Q100 compliance. IC Role / Device Role / Timing Role: Point-of-load regulator generating 1.2 V core and 2.8 V analog rails; synchronized switching minimizes beat frequencies with sensor clocks. Use Value: 0.8 V ±1% reference and current-mode control deliver <±1% output regulation under ±30% line/load transients; thermal shutdown protects during lens heater surges. |
| eCall Telematics Unit | Industrial 24 V Field Bus Node |
|
Use Scenario: Powers GSM modem, GPS receiver, and CAN transceiver in emergency call systems that must operate continuously on vehicle battery. IC Role / Device Role / Timing Role: Always-on 5 V supply with ultra-low IQ; monitors battery health and initiates backup power switchover during ignition-off. Use Value: 2 µA shutdown current extends battery life during multi-year parked periods; load-dump survival up to 65 V prevents field failures. |
Use Scenario: Converts 24 V industrial bus to isolated 3.3 V/5 V for PLC I/O modules, motor drivers, and safety controllers in harsh factory environments. IC Role / Device Role / Timing Role: Robust primary DC-DC stage handling wide input variation (18–32 V), conducted noise, and thermal cycling. Use Value: HSOP PowerPAD™ package achieves 22.6°C/W junction-to-board thermal resistance; 150°C max TJ rating supports uncooled enclosure operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQDNTQ1 | 42-V, 3-A dual-channel synchronous buck with spread-spectrum EMI reduction; higher integration but lower current rating. | Better suited for space-constrained dual-rail systems (e.g., processor + memory); lacks Eco-mode™ for ultra-low IQ. | Select when EMI compliance is critical and total output current ≤3 A per channel; not drop-in due to different pinout and control architecture. |
| TPS54560BQDDARQ1 | Same family, 60-V input rating (vs. 42 V), identical 5-A capability, pin-compatible, shares same HSOP-8 footprint and COMP/FB/EN/RT/CLK functions. | Direct upgrade path for designs facing higher input transients (e.g., 48 V hybrid systems); requires validation of 60 V-rated external components. | Choose for future-proofing against rising bus voltages; identical layout and firmware interface - only VIN rating differs. |
Compared with LM5143AQDNTQ1, TPS54540BQDDARQ1 delivers higher single-rail current (5 A vs. 3 A) and superior light-load efficiency via Eco-mode™, while TPS54560BQDDARQ1 offers seamless 60-V input compatibility with zero layout change - making it the optimal functional upgrade.
Availability
TPS54540BQDDARQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and eCall telematics systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TPS54540BQDDARQ1 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 designing analog ICs, embedded processors, and system solutions for automotive, industrial, and communications markets.
The TPS54540BQDDARQ1 belongs to TI's automotive-qualified DC-DC converter portfolio, engineered specifically for demanding vehicle power systems requiring high input voltage tolerance, low quiescent current, and robust thermal/EMI performance.
FAQ
What is the maximum input voltage the TPS54540BQDDARQ1 can withstand during load-dump events?
The TPS54540BQDDARQ1 survives load-dump pulses up to 65 V per ISO 7637-2, though its recommended operating input range remains 4.5 V to 42 V. This transient rating ensures reliability in 12 V automotive systems where alternator load dumps generate high-voltage spikes. The device's absolute maximum VIN rating is 65 V, aligning precisely with this stress condition.
Does the TPS54540BQDDARQ1 require an external bootstrap diode?
No, the TPS54540BQDDARQ1 integrates a BOOT recharge FET, eliminating the need for an external bootstrap diode. A 0.1 µF ceramic capacitor between BOOT and SW pins suffices for gate drive. This integration reduces BOM count, improves reliability, and enables stable operation at duty cycles approaching 100%, especially critical during low-input-voltage conditions like cold-crank.
How does Eco-mode™ affect light-load efficiency in the TPS54540BQDDARQ1?
Eco-mode™ reduces the TPS54540BQDDARQ1's operating quiescent current to 146 µA by skipping switching pulses when the output is regulated and peak switch current falls below ~700 mA. This cuts gate-drive and switching losses, boosting efficiency at loads below ~100 mA. At zero load, average input current drops to ~240 µA - essential for automotive always-on modules meeting stringent battery drain budgets.
Can the TPS54540BQDDARQ1 synchronize to an external clock, and what are the timing requirements?
Yes, the TPS54540BQDDARQ1 synchronizes to an external clock via the RT/CLK pin when pulled above 1.55 V, disabling the internal oscillator and enabling PLL lock. Minimum CLK pulse width is 15 ns, and PLL lock time is 78 µs at 500 kHz. Synchronization eliminates beat frequencies in multi-converter systems - vital for ADAS camera modules where switching noise could interfere with image sensors.
What thermal metrics define the TPS54540BQDDARQ1's power dissipation capability in the HSOP package?
The TPS54540BQDDARQ1 in HSOP-8 (DDA) package has RθJA = 41.7°C/W (junction-to-ambient), RθJB = 22.6°C/W (junction-to-board), and RθJC(bot) = 2.6°C/W (junction-to-case bottom). These values assume proper PowerPAD™ soldering to a 2-layer 1-in² copper area. For 5-A operation at 12 V input → 3.3 V output, junction temperature rise is ~35°C above ambient - well within the –40°C to 150°C operating range.
TPS54540BQDDARQ1 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:
- 100kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54540BQDDARQ1 FAQ
1.How can I place an order for TPS54540BQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54540BQDDARQ1 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 TPS54540BQDDARQ1 reliable?
The price and inventory of TPS54540BQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54540BQDDARQ1 is usually 5 days.
3.What payment methods are accepted for TPS54540BQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54540BQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54540BQDDARQ1?
TPS54540BQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54540BQDDARQ1 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 TPS54540BQDDARQ1?
For technical support, including TPS54540BQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54540BQDDARQ1 requirements.
6.How does Aetrix verify that TPS54540BQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54540BQDDARQ1 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 TPS54540BQDDARQ1 meets industry standards.
7.What is the process for return or replacement of TPS54540BQDDARQ1?
All TPS54540BQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54540BQDDARQ1, 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 TPS54540BQDDARQ1 part is unused and in its original packaging.
Return procedure for TPS54540BQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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