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Texas Instruments TPS54540QDDAQ1
- Part No.:
- TPS54540QDDAQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54540QDDAQ1.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
TPS54540QDDAQ1 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, Eco-mode™ pulse-skipping for light-load efficiency, and adjustable 100-kHz to 2.5-MHz switching frequency. It delivers regulated power in vehicle accessories, ADAS, and industrial 24-V/48-V systems.
For engineers reviewing the TPS54540QDDAQ1 datasheet, TPS54540QDDAQ1 pinout, TPS54540QDDAQ1 application, or TPS54540QDDAQ1 equivalent, key selection considerations include its 146-μA no-load quiescent current, 2-μA shutdown current, internal 0.8-V ±1% reference, thermal shutdown at 176°C, and HSOP-8 PowerPAD™ package with exposed thermal pad.
Technical Context
The TPS54540QDDAQ1 implements fixed-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its RT/CLK pin supports both resistor-programmed frequency (100 kHz–2.5 MHz) and external clock synchronization via PLL.
It integrates a bootstrap recharge FET to sustain high-duty-cycle operation near dropout, monitors BOOT-SW voltage for UVLO protection, and uses cycle-by-cycle current limiting with foldback during overload. Soft-start time varies inversely with switching frequency (0.42 ms at 2.5 MHz, 2.1 ms at 500 kHz).
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; withstands 65-V load-dump pulses per ISO 7637. |
| Output Current | 5 A continuous - Delivers full rated current with proper PCB thermal design using HSOP-8 PowerPAD™ package. |
| Switching Frequency | 100 kHz to 2.5 MHz - Adjustable via RT resistor or external clock; enables optimization of efficiency vs. size of inductor/capacitor. |
| Quiescent Current | 146 μA (operating), 2 μA (shutdown) - Enables always-on subsystems with minimal battery drain in automotive applications. |
| Reference Voltage | 0.8 V ±1% - Sets output voltage accuracy; used with external FB divider for precise regulation down to 0.8 V. |
| High-Side RDS(on) | 92 mΩ (typical at VIN = 12 V, BOOT-SW = 6 V) - Defines conduction loss and thermal rise at full load; impacts efficiency at mid-to-high loads. |
| UVLO Threshold | 4.3 V (rising), 4.3 V – 325 mV = 3.975 V (falling) - Ensures reliable start-up and brownout recovery; adjustable via EN pin resistor divider. |
Pinout & Package
TPS54540QDDAQ1 is housed in an 8-pin HSOP PowerPAD™ package (4.89 mm × 3.90 mm) with thermally enhanced exposed pad (PowerPAD) that must be soldered to PCB ground plane for thermal and electrical performance.
| 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 bulk and ceramic input capacitors. |
| GND | Power and signal ground | Common return for input/output paths; connects to PowerPAD for low-impedance thermal path and noise control. |
| SW | Switching node | Drain of internal high-side MOSFET; connects to inductor; high dv/dt node requiring tight layout and snubber if needed. |
| FB | Feedback input | Inverting input of error amplifier; sets output voltage via resistor divider from VOUT; sensitive to noise and trace length. |
| COMP | Error amplifier output | Drives PWM comparator; connects to compensation network (type II or III); determines loop stability and transient response. |
| EN | Enable / UVLO control | Pull below 1.2 V to disable; float or pull up to enable; external resistors adjust UVLO threshold and hysteresis. |
| RT/CLK | Frequency programming / sync input | Resistor-to-ground sets frequency; external clock edges synchronize switching; internal PLL locks to falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse-skipping | Reduces light-load quiescent current to 146 μA by skipping switching cycles while maintaining regulation - critical for automotive always-on modules. |
| Integrated BOOT recharge FET | Enables >95% duty cycle operation without external diode; sustains gate drive during low dropout - supports VOUT up to ~VIN – 0.5 V. |
| Current-mode control with slope compensation | Ensures stable operation at duty cycles >50%; eliminates need for external compensation components beyond COMP network. |
| Adjustable UVLO with hysteresis | Internal 4.3-V threshold with 325-mV hysteresis; externally programmable via EN pin divider - prevents erratic start-up during battery sag. |
| Thermal shutdown with 12°C hysteresis | Shuts down at 176°C junction temperature and restarts at 164°C - protects IC and system under sustained overload or poor heatsinking. |
Applications
| Automotive ADAS Camera Power | USB Dedicated Charging Port (DCP) |
|---|---|
|
Use Scenario: Powering 5-V or 12-V image sensor modules in forward-facing cameras with strict EMI and thermal constraints. IC Role / Device Role: Primary buck regulator converting 12-V battery to stable 5-V rail; handles cold-crank (4.5 V) and load-dump (65 V) transients. Use Value: Eco-mode™ maintains <150-μA quiescent current during camera standby; integrated BOOT FET enables compact layout without discrete diode. |
Use Scenario: Providing BC1.2-compliant 5-V/1.5-A USB charging in vehicle infotainment head units. IC Role / Device Role: High-efficiency step-down converter delivering constant 5-V output across wide input range (9–16 V nominal battery). Use Value: 92-mΩ RDS(on) and 5-A rating support full USB DCP load with <85°C junction rise; AEC-Q100 qualification ensures reliability over lifetime. |
| Industrial 24-V Motor Control Auxiliary Supply | Railway/Commercial Vehicle 48-V System Converter |
|
Use Scenario: Generating isolated 3.3-V or 5-V logic supply from 24-V DC bus for motor gate drivers and MCU in HVAC actuators. IC Role / Device Role: Non-isolated buck stage providing clean, regulated auxiliary power; operates continuously in harsh vibration/temperature environments. Use Value: 150°C max junction temperature and HSOP PowerPAD™ package ensure robust thermal performance; RT/CLK sync avoids EMI peaks in noise-sensitive control loops. |
Use Scenario: Converting 48-V traction or telecom bus to 12-V intermediate rail for lighting, displays, and telemetry in commercial vehicles. IC Role / Device Role: High-input-voltage buck regulator surviving 65-V transients; delivers 5-A continuous output with minimal external components. Use Value: 42-V max input rating and load-dump tolerance eliminate need for upstream TVS clamping; adjustable frequency allows optimal filter sizing for 48-V ripple rejection. |
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 and higher integration (integrated boot diode, current sense amp). | Targeted at multi-rail systems needing channel interleaving; lower per-channel current rating but superior EMI performance. | Choose LM5143AQDPRRQ1 when dual outputs or spread-spectrum EMI reduction are required; not a drop-in replacement due to different pinout and control architecture. |
| MPQ4313-AEC1 | 45-V, 5-A monolithic buck with 150-μA quiescent current, but no Eco-mode™ and fixed 2.2-MHz frequency. | Optimized for space-constrained designs where fixed high frequency simplifies filtering; lacks adjustable frequency and pulse-skip flexibility. | Choose MPQ4313-AEC1 for ultra-compact layouts where 2.2-MHz fixed operation suffices; verify thermal margin as RDS(on) is higher than TPS54540QDDAQ1. |
Compared with LM5143AQDPRRQ1 and MPQ4313-AEC1, the TPS54540QDDAQ1 offers unique flexibility in frequency tuning, proven Eco-mode™ efficiency at microamp-level loads, and mature AEC-Q100 Grade 1 qualification - making it optimal for single-rail automotive subsystems demanding wide input range and ultra-low standby power.
Availability
TPS54540QDDAQ1 is available at Aetrix Electronics and suitable for automotive ADAS, industrial motor control, and 48-V commercial vehicle power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for TPS54540QDDAQ1 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-grade power management solutions with decades of automotive qualification expertise.
The TPS54540-Q1 product line was designed specifically for automotive power conversion in harsh environments - delivering high-current, wide-input-voltage DC-DC regulation with integrated protection, thermal resilience, and AEC-Q100 Grade 1 reliability.
FAQ
What is the maximum input voltage the TPS54540QDDAQ1 can withstand during load-dump events?
The TPS54540QDDAQ1 is rated to survive load-dump pulses up to 65 V per ISO 7637, exceeding its 42-V maximum operating input voltage. This transient rating is validated under AEC-Q100 stress testing and ensures robustness in automotive 12-V and 24-V systems during alternator regulation faults.
Does the TPS54540QDDAQ1 require an external bootstrap diode?
No, the TPS54540QDDAQ1 integrates a bootstrap recharge FET, eliminating the need for an external bootstrap diode. A 0.1-μF ceramic capacitor between BOOT and SW is sufficient; TI recommends X7R/X5R dielectric with ≥10-V rating for stable performance across temperature and voltage.
How does Eco-mode™ operate in the TPS54540QDDAQ1, and what is its impact on output voltage ripple?
Eco-mode™ in the TPS54540QDDAQ1 activates when load current drops below ~18 mA (dependent on inductor value), causing the device to skip switching cycles while maintaining regulation. COMP is clamped at 600 mV during skip mode. Output ripple increases slightly during skip intervals but remains within specification; typical no-load quiescent current is 146 μA.
Can the TPS54540QDDAQ1 synchronize to an external clock, and what are the timing requirements?
Yes, the TPS54540QDDAQ1 synchronizes to an external clock via the RT/CLK pin. When driven above 1.55 V (high threshold), the internal amplifier disables and the pin becomes a high-impedance clock input. Minimum CLK pulse width is 15 ns; PLL lock time is 78 μs at 500 kHz. Falling edges trigger synchronization.
What thermal metrics define the TPS54540QDDAQ1's thermal performance in the HSOP-8 PowerPAD™ package?
The TPS54540QDDAQ1 in the DDA (HSOP-8 PowerPAD™) package has RθJA = 41.7°C/W (junction-to-ambient), RθJC(bot) = 2.6°C/W (junction-to-case bottom), and ψJB = 22.5°C/W (junction-to-board). Proper soldering of the PowerPAD to a large copper area is essential to achieve these values and maintain ≤150°C junction temperature at 5-A load.
TPS54540QDDAQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Eco-Mode™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
TPS54540QDDAQ1 FAQ
1.How can I place an order for TPS54540QDDAQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54540QDDAQ1 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 TPS54540QDDAQ1 reliable?
The price and inventory of TPS54540QDDAQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54540QDDAQ1 is usually 5 days.
3.What payment methods are accepted for TPS54540QDDAQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54540QDDAQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54540QDDAQ1?
TPS54540QDDAQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54540QDDAQ1 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 TPS54540QDDAQ1?
For technical support, including TPS54540QDDAQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54540QDDAQ1 requirements.
6.How does Aetrix verify that TPS54540QDDAQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54540QDDAQ1 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 TPS54540QDDAQ1 meets industry standards.
7.What is the process for return or replacement of TPS54540QDDAQ1?
All TPS54540QDDAQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54540QDDAQ1, 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 TPS54540QDDAQ1 part is unused and in its original packaging.
Return procedure for TPS54540QDDAQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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