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Texas Instruments TPS54540QDDARQ1
- Part No.:
- TPS54540QDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54540QDDARQ1.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,624
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Product details
Overview
TPS54540QDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 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 output down to 0.8 V in automotive GPS, ADAS, and industrial 24-V power systems.
For engineers reviewing the TPS54540QDDARQ1 datasheet, TPS54540QDDARQ1 pinout, TPS54540QDDARQ1 application, or TPS54540QDDARQ1 equivalent, key selection considerations include its 146-μA quiescent current in Eco-mode, internal BOOT recharge FET enabling >99% duty cycle operation, and RT/CLK pin support for both resistor-set frequency and external clock synchronization - critical for EMI-sensitive automotive designs.
Technical Context
The TPS54540QDDARQ1 implements fixed-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier features 350-μS transconductance and 10,000 V/V DC gain, driving COMP to regulate SW node current via PWM comparator.
It integrates a phase-locked loop (PLL) on the RT/CLK pin for synchronization to external clocks, and uses cycle-by-cycle current limiting with 7.5-A typical threshold. Thermal shutdown activates at 176°C with 12°C hysteresis, and undervoltage lockout is internally set at 4.3 V (±0.18 V) with adjustable hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports 12-V, 24-V, and 48-V automotive and industrial rails with 65-V load-dump survival. |
| Output Current | 5 A continuous - enables single-chip power for USB charging ports, ADAS cameras, and motor control logic supplies. |
| Switching Frequency | 100 kHz to 2.5 MHz - adjustable via RT resistor or external clock; allows optimization of inductor size vs. efficiency. |
| Quiescent Current | 146 μA in Eco-mode - reduces standby power in always-on vehicle accessories without compromising wake-up response. |
| Feedback Reference | 0.8 V ±1% - sets precise output voltage with external resistor divider; enables 0.8-V minimum output for low-voltage ICs. |
| High-Side RDS(on) | 92 mΩ typical at VIN = 12 V - minimizes conduction loss and thermal rise at full load in HSOP PowerPAD package. |
| Shutdown Current | 2 μA - ensures ultra-low leakage during vehicle ignition-off states, preserving battery life. |
Pinout & Package
TPS54540QDDARQ1 is housed in an 8-pin HSOP (DDA) package with exposed PowerPAD (4.89 mm × 3.90 mm), requiring PCB thermal pad connection to GND for thermal performance (RθJA = 41.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor node | Supplies gate drive for high-side MOSFET; integrated recharge FET enables near-100% duty cycle operation during dropout. |
| COMP | Error amplifier output | Drives PWM comparator; connects to RC compensation network for loop stability across line/load/transient conditions. |
| EN | Enable / UVLO control | Pull below 1.2 V to disable; external resistor divider adjusts start-up threshold and hysteresis for system-level sequencing. |
| FB | Inverting error amp input | Senses output voltage via resistive divider; referenced to 0.8-V internal bandgap for accurate regulation. |
| GND | Power and signal ground | Common return for power path and control circuitry; must be connected to PowerPAD for thermal and noise integrity. |
| RT/CLK | Frequency programming / sync input | Resistor-to-GND sets frequency; pulled above 1.55 V to enter PLL sync mode - eliminates beat frequencies in multi-rail systems. |
| SW | Switching node | Drains high-side MOSFET source; connects to external inductor and catch diode/FET; high dv/dt node requiring careful layout. |
| VIN | Main input supply | Accepts 4.5–42 V; includes internal UVLO and withstands 65-V ISO 7637 load-dump pulses without external protection. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse-skipping | Reduces no-load input current to 146 μA while maintaining regulation - extends battery runtime in parked vehicle modes. |
| Integrated BOOT recharge FET | Enables operation down to ~0.3-V dropout (e.g., 5-V out from 5.3-V in) without external diode - simplifies layout and improves light-load efficiency. |
| Adjustable UVLO with hysteresis | Internal 4.3-V threshold + 325-mV hysteresis; externally scalable via EN pin divider - prevents brownout oscillation during cold-crank events. |
| Current-mode control with slope compensation | Stabilizes loop at >50% duty cycle without external ramp generator - ensures robust transient response across wide VIN/VOUT ranges. |
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C ambient operation with HBM ±2000 V / CDM ±750 V ESD - meets automotive electronics reliability requirements. |
Applications
| Automotive ADAS Camera Power | USB Dedicated Charging Port (DCP) |
|---|---|
|
Use Scenario: Powering 3.3-V image sensor and ISP in forward-facing collision avoidance camera with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3 V @ 2.5 A; handles 4.5–18-V input range during engine start. Use Value: Eco-mode maintains <150-μA quiescent draw during sleep; 92-mΩ RDS(on) limits thermal rise under continuous video capture. |
Use Scenario: Providing BC1.2-compliant 5-V/1.5-A output from 12-V vehicle bus for infotainment USB ports. IC Role / Device Role / Timing Role: Constant-voltage buck controller with tight 0.8-V reference accuracy ensuring ±1% 5-V output regulation. Use Value: Adjustable switching frequency avoids AM-band interference; SYNC capability aligns switching with other rails to reduce EMI peaks. |
| Industrial 24-V Motor Control Logic Supply | GPS Module Power in Telematics Unit |
|
Use Scenario: Generating isolated 5-V logic supply for microcontroller and gate drivers in 24-V BLDC motor drive. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 18–36-V nominal input with load-dump immunity. Use Value: 65-V absolute max rating eliminates need for TVS clamping; thermal shutdown protects against sustained overloads during stall conditions. |
Use Scenario: Powering GPS receiver (e.g., u-blox MAX-M8Q) requiring stable 3.3-V supply with low noise and fast load transient response. IC Role / Device Role / Timing Role: Low-noise buck regulator with internal soft-start and frequency foldback for clean startup and fault recovery. Use Value: 100-kHz min frequency enables use of low-ESR ceramic capacitors; COMP pin compensation ensures <10-μs transient recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQDPRRQ1 | 42-V, 3-A, dual-channel synchronous buck with spread-spectrum EMI reduction; higher integration but lower current rating. | Preferred for multi-rail systems needing channel interleaving; not suitable for single-rail 5-A loads. | Select when EMI compliance is critical and total output current ≤3 A per channel. |
| MPQ4333GQ-AEC1 | 40-V, 5-A buck with 175-μA quiescent current; non-AEC-Q100 but automotive-grade; lacks RT/CLK sync capability. | Used in cost-sensitive telematics where external clock sync is unnecessary and AEC-Q100 documentation is optional. | Select when budget constraints outweigh need for synchronization and formal automotive qualification. |
Compared with LM5143AQDPRRQ1 and MPQ4333GQ-AEC1, the TPS54540QDDARQ1 uniquely balances 5-A output, AEC-Q100 Grade 1 certification, Eco-mode efficiency, and RT/CLK synchronization - making it optimal for single-rail, high-reliability automotive subsystems where thermal margin and EMI control are co-prioritized.
Availability
TPS54540QDDARQ1 is available at Aetrix Electronics and suitable for automotive ADAS, industrial motor control, and USB charging port designs requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for TPS54540QDDARQ1 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 automotive ICs, with decades of expertise in power management innovation.
The TPS54540-Q1 belongs to TI's automotive-qualified DC-DC converter portfolio, designed specifically for harsh-environment vehicle subsystems demanding high input voltage range, load-dump resilience, and low-quiescent-current operation.
FAQ
What is the maximum input voltage the TPS54540QDDARQ1 can withstand during load-dump events?
The TPS54540QDDARQ1 survives load-dump pulses up to 65 V per ISO 7637, exceeding its 42-V recommended operating maximum. This rating is validated under AEC-Q100 stress testing and allows direct connection to 12-V and 24-V automotive batteries without external TVS clamping in most cases. The device's absolute maximum VIN rating is 65 V, and operation beyond 42 V is only permitted during transient events, not steady-state.
Does the TPS54540QDDARQ1 require an external bootstrap diode?
No, the TPS54540QDDARQ1 integrates a BOOT recharge FET, eliminating the need for an external bootstrap diode. A 0.1-μF X7R/X5R ceramic capacitor between BOOT and SW suffices for gate drive. This integration reduces BOM count, PCB area, and improves reliability in automotive environments where discrete diodes may fail under thermal cycling.
How does Eco-mode™ affect light-load efficiency in the TPS54540QDDARQ1?
Eco-mode™ reduces TPS54540QDDARQ1's operating quiescent current to 146 μA at no load by skipping switching cycles while maintaining output regulation. At ~18 mA output, it enters pulse-skip mode; below that, average input current drops to ~240 μA. This directly extends battery life in always-on vehicle modules like GPS and eCall without sacrificing regulation accuracy or transient response.
Can the TPS54540QDDARQ1 synchronize to an external clock, and what are the voltage thresholds?
Yes, the TPS54540QDDARQ1 synchronizes to external clocks via the RT/CLK pin. When pulled above 1.55 V (typical), it disables the internal oscillator and enters PLL sync mode. The pin accepts TTL- or CMOS-compatible clock signals with minimum pulse width of 15 ns. Synchronization eliminates beat frequencies in multi-converter systems and aids EMI filtering by fixing switching harmonics.
What is the thermal resistance of the TPS54540QDDARQ1 in its HSOP PowerPAD package?
The TPS54540QDDARQ1 in the DDA (HSOP-8 with PowerPAD) package has a junction-to-ambient thermal resistance (RθJA) of 41.7°C/W under standard JEDEC 2-layer board conditions. With proper PCB thermal pad design (≥250 mm² copper, 4+ thermal vias), actual RθJA can improve to ~30°C/W, enabling full 5-A operation at +85°C ambient without forced airflow.
TPS54540QDDARQ1 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54540QDDARQ1 FAQ
1.How can I place an order for TPS54540QDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54540QDDARQ1 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 TPS54540QDDARQ1 reliable?
The price and inventory of TPS54540QDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54540QDDARQ1 is usually 5 days.
3.What payment methods are accepted for TPS54540QDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54540QDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54540QDDARQ1?
TPS54540QDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54540QDDARQ1 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 TPS54540QDDARQ1?
For technical support, including TPS54540QDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54540QDDARQ1 requirements.
6.How does Aetrix verify that TPS54540QDDARQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54540QDDARQ1 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 TPS54540QDDARQ1 meets industry standards.
7.What is the process for return or replacement of TPS54540QDDARQ1?
All TPS54540QDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54540QDDARQ1, 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 TPS54540QDDARQ1 part is unused and in its original packaging.
Return procedure for TPS54540QDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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