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Texas Instruments TPS54540BQDDAQ1
- Part No.:
- TPS54540BQDDAQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54540BQDDAQ1.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:255
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Product details
Overview
TPS54540BQDDAQ1 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 adjustable 100-kHz to 2.5-MHz switching frequency. It delivers regulated power in vehicle accessories, USB charging ports, and industrial 12/24/48-V systems.
For engineers reviewing the TPS54540BQDDAQ1 datasheet, TPS54540BQDDAQ1 pinout, TPS54540BQDDAQ1 application, or TPS54540BQDDAQ1 equivalent, key selection considerations include Eco-mode™ light-load efficiency, BOOT-recharge FET for low-dropout operation, RT/CLK synchronization capability, and thermal shutdown protection up to 176°C junction temperature.
Technical Context
This current-mode buck regulator implements fixed-frequency PWM control with slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier features 350-μS transconductance (77-μS during soft-start) and drives the COMP pin to modulate peak switch current.
The device supports dual operating modes on the RT/CLK pin: resistor-programmed frequency (100 kHz–2.5 MHz) or external clock synchronization (160 kHz–2.3 MHz). Integrated BOOT recharge FET enables >99% effective duty cycle, while pulse-skipping Eco-mode reduces no-load quiescent current to 146 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - Supports automotive load-dump pulses up to 65 V per ISO 7637; minimum VIN for regulation depends on output voltage and component losses. |
| Output Current | 5 A continuous - Limited cycle-by-cycle; peak switch current threshold is 6.3–9.5 A depending on temperature and input voltage. |
| Switching Frequency | 100 kHz to 2.5 MHz - Adjustable via RT resistor or external clock; frequency foldback activates during overcurrent or start-up to maintain control. |
| Quiescent Current | 146 μA (operating), 2 μA (shutdown) - Enables ultra-low-power standby in always-on automotive modules. |
| Reference Voltage | 0.8 V ±1% - Stable over –40°C to 125°C ambient; used with external resistor divider to set output voltage from 0.8 V to 58.8 V. |
| Thermal Protection | 176°C shutdown with 12°C hysteresis - Prevents damage during overload or poor PCB thermal design; PowerPAD package enhances heat dissipation. |
| UVLO Threshold | 4.3 V (rising), 4.0 V (falling) - Internally set; adjustable via external resistor divider on EN pin for custom input voltage sequencing. |
Pinout & Package
TPS54540BQDDAQ1 uses an 8-pin HSOP PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad (PowerPAD) requiring direct solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 4.5–42 V; must be decoupled near pin; survives 65-V load dump transients per ISO 7637. |
| EN | Enable control input | Pulled high internally (1.2 μA); disable by pulling below 1.2 V; UVLO threshold adjustable with resistor divider. |
| RT/CLK | Frequency programming/sync input | Resistor-to-ground sets frequency (100 kHz–2.5 MHz); external clock edges (160 kHz–2.3 MHz) override resistor mode. |
| COMP | Error amplifier output | Drives external compensation network (R-C-RC); transconductance = 350 μS (normal), 77 μS (soft-start). |
| FB | Feedback sensing input | Inverting input of gm amplifier; compares divided output voltage against 0.8-V reference for regulation. |
| GND | Analog ground reference | Common return for control circuitry; separate from PowerPAD but must connect to same ground plane. |
| BOOT | Bootstrap gate drive supply | Connects to SW via 0.1-μF ceramic capacitor; integrated recharge FET enables high-duty-cycle operation. |
| SW | Switching node output | Drain of internal high-side MOSFET; connects to external inductor and BOOT capacitor; high dv/dt node. |
| PowerPAD | Thermal & electrical ground | Exposed pad; must be soldered to large PCB copper area tied to GND for thermal management (RθJB = 22.6°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces no-load IQ to 146 μA by disabling switching when output is regulated and peak current falls below 600 mV COMP threshold. |
| Integrated BOOT recharge FET | Enables >99% effective duty cycle without external diode; eliminates need for discrete bootstrap diode and reduces BOM count. |
| Adjustable UVLO with hysteresis | Internal 4.3 V / 4.0 V thresholds; extended UVLO range achievable using two resistors on EN pin with 3.4-μA hysteresis current. |
| Current-mode control with slope compensation | Prevents subharmonic oscillation at >50% duty cycle; maintains stable loop response across full input/output range. |
| AEC-Q100 Grade 1 qualification | Rated for –40°C to 125°C ambient operation; HBM ESD Class H1C (±2 kV), CDM Class C3B (±750 V); qualified for safety-critical automotive use. |
Applications
| Vehicle GPS & ADAS Modules | USB Dedicated Charging Ports |
|---|---|
|
Use Scenario: Powering GPS receivers, radar sensors, and camera modules in automotive ADAS ECUs where input voltage varies from cold-crank (4.5 V) to load-dump (65 V). IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V buck regulator delivering clean, regulated power with fast transient response and thermal robustness. Use Value: Survives ISO 7637-2 load-dump pulses up to 65 V; Eco-mode extends battery life during vehicle sleep mode. |
Use Scenario: Providing 5-V/3-A output for USB BC1.2 or QC3.0 charging ports in automotive infotainment systems. IC Role / Device Role / Timing Role: High-efficiency DC-DC stage converting 12-V vehicle bus to stable 5-V USB output with tight line/load regulation. Use Value: 92-mΩ high-side MOSFET and low 146-μA quiescent current enable >92% efficiency at 1-A load and minimal standby drain. |
| Industrial Motor Control Drives | 48-V Telecom & Datacom Systems |
|
Use Scenario: Generating 15-V gate drive and 5-V logic supplies for BLDC motor controllers in factory automation equipment. IC Role / Device Role / Timing Role: Input-stage buck converter accepting wide-range 24–48-V industrial input and delivering isolated auxiliary rails. Use Value: Adjustable switching frequency avoids noise-sensitive bands; RT/CLK sync allows coordinated multi-rail timing in servo drives. |
Use Scenario: Point-of-load conversion in 48-V intermediate bus architectures for optical networking or server management cards. IC Role / Device Role / Timing Role: Compact, thermally efficient 5-A regulator stepping down 48-V backplane to 12-V or 5-V system rails. Use Value: HSOP PowerPAD package achieves RθJB = 22.6°C/W; supports high ambient temperatures without derating. |
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 drivers, current sense amp) | Better suited for multi-rail systems requiring channel interleaving or tighter EMI control; lower max output current per channel | Select when needing dual outputs or EMI reduction; not a drop-in replacement due to different pinout and control architecture |
| TPS54560BQDDAQ1 | Same family, 60-V input rating, identical pinout and feature set except higher VIN max and adjusted current limit (6.5 A typical) | Direct upgrade path for designs requiring higher input voltage margin (e.g., 48-V systems with 80-V transients) | Drop-in compatible with same layout; verify current limit and thermal performance at elevated input voltages |
Compared with LM5143AQDPRRQ1, TPS54540BQDDAQ1 offers higher single-channel current and simpler compensation but lacks spread-spectrum EMI reduction. Against TPS54560BQDDAQ1, it trades 18-V input headroom for slightly lower cost and identical footprint-ideal for 12/24-V automotive applications without 60-V transients.
Availability
TPS54540BQDDAQ1 is available at Aetrix Electronics and suitable for automotive ADAS modules, USB charging ports, and industrial motor control systems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for TPS54540BQDDAQ1 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 company specializing in analog, embedded processing, and power management ICs, with leadership in automotive-grade power solutions and broad design tool ecosystem support.
TPS54540BQDDAQ1 belongs to TI's automotive-qualified SIMPLE SWITCHER® buck converter product line, designed specifically for robust, high-efficiency DC-DC conversion in harsh automotive and industrial environments.
FAQ
What is the maximum input voltage rating for TPS54540BQDDAQ1, and how does it handle load-dump conditions?
The TPS54540BQDDAQ1 has a 42-V recommended operating input voltage and survives 65-V load-dump transients per ISO 7637-2. Absolute maximum VIN is 65 V, verified under transient conditions. This makes TPS54540BQDDAQ1 suitable for 12-V and 24-V automotive systems where alternator load dumps occur. The internal circuitry remains functional during these events without latch-up or damage when properly decoupled.
Does TPS54540BQDDAQ1 support synchronization to an external clock, and what are the valid frequency and voltage levels?
Yes, TPS54540BQDDAQ1 supports external clock synchronization on the RT/CLK pin. Valid input clock frequency range is 160 kHz to 2.3 MHz. The pin accepts TTL- or CMOS-level clocks with high threshold of 1.55–2.0 V and low threshold of 0.5–1.2 V. When synchronized, the internal oscillator locks to the falling edge of the external clock, enabling precise timing coordination across multiple converters in a system.
How does the Eco-mode™ operation of TPS54540BQDDAQ1 improve light-load efficiency, and at what load does it activate?
TPS54540BQDDAQ1 enters Eco-mode™ when output voltage is regulated and peak switch current falls below the 600-mV COMP threshold-typically around 18 mA for standard 22-μH inductors. In this mode, switching pauses until output droop triggers recovery, reducing no-load quiescent current to 146 μA. This significantly extends battery runtime in always-on automotive modules such as telematics or eCall systems.
What is the role of the PowerPAD in the TPS54540BQDDAQ1 HSOP package, and how must it be implemented on the PCB?
The PowerPAD in TPS54540BQDDAQ1 is an exposed thermal pad that serves as both thermal dissipation path and electrical ground connection. It must be soldered directly to a large, low-thermal-resistance PCB copper area tied to system ground. TI specifies RθJB = 22.6°C/W with proper implementation. Failure to connect the PowerPAD results in thermal shutdown at <50% of rated load due to excessive junction temperature rise.
Can the undervoltage lockout (UVLO) threshold of TPS54540BQDDAQ1 be adjusted, and how is hysteresis achieved?
Yes, the UVLO threshold of TPS54540BQDDAQ1 can be increased using two external resistors on the EN pin. Internal hysteresis is provided by a 3.4-μA current source that activates when EN exceeds 1.2 V, raising the turn-on threshold; removing this current lowers the turn-off threshold. This creates programmable hysteresis independent of resistor values, ensuring clean startup/shutdown sequencing in automotive battery monitoring circuits.
TPS54540BQDDAQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
TPS54540BQDDAQ1 FAQ
1.How can I place an order for TPS54540BQDDAQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54540BQDDAQ1 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 TPS54540BQDDAQ1 reliable?
The price and inventory of TPS54540BQDDAQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54540BQDDAQ1 is usually 5 days.
3.What payment methods are accepted for TPS54540BQDDAQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54540BQDDAQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54540BQDDAQ1?
TPS54540BQDDAQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54540BQDDAQ1 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 TPS54540BQDDAQ1?
For technical support, including TPS54540BQDDAQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54540BQDDAQ1 requirements.
6.How does Aetrix verify that TPS54540BQDDAQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54540BQDDAQ1 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 TPS54540BQDDAQ1 meets industry standards.
7.What is the process for return or replacement of TPS54540BQDDAQ1?
All TPS54540BQDDAQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54540BQDDAQ1, 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 TPS54540BQDDAQ1 part is unused and in its original packaging.
Return procedure for TPS54540BQDDAQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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