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Texas Instruments TPS54340BQDDARQ1
- Part No.:
- TPS54340BQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54340BQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
TPS54340BQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 4.5-V to 42-V input, 3.5-A synchronous step-down DC-DC converter with integrated 92-mΩ high-side N-channel MOSFET, Eco-mode™ pulse-skipping for light-load efficiency, 0.8-V ±1% internal reference, and adjustable 100-kHz to 2.5-MHz switching frequency. It delivers regulated power in vehicle GPS, ADAS, and 12-V/24-V industrial systems.
For engineers reviewing the TPS54340BQDDARQ1 datasheet, TPS54340BQDDARQ1 pinout, TPS54340BQDDARQ1 application, or TPS54340BQDDARQ1 equivalent, key selection criteria include its 45-V load-dump survival per ISO 7637, 146-μA no-load quiescent current, BOOT-recharge FET for low-dropout operation, RT/CLK synchronization capability, and HSOP PowerPAD™ thermal package for automotive under-hood environments.
Technical Context
The TPS54340BQDDARQ1 implements constant-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier features 350-μS transconductance during normal operation and reduced 77-μS gain during soft-start, with COMP pin serving as both error amplifier output and PWM comparator input.
It integrates a bootstrap recharge FET to sustain >99% effective duty cycle, enabling operation down to VOUT ≈ VIN(min) – IO×RDS(on) – VF, and includes overvoltage protection that disables the high-side switch until output falls below 106% of regulation. Frequency foldback activates during start-up and overload to maintain inductor current control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports 12-V and 24-V automotive/industrial rails; survives 45-V load-dump transients per ISO 7637. |
| Output Current | 3.5 A continuous - determined by thermal limits and on-resistance; validated across –40°C to 150°C junction temperature. |
| Switching Frequency | 100 kHz to 2.5 MHz - set via RT resistor or synchronized to external clock; enables optimization of efficiency vs. filter size. |
| Quiescent Current | 146 μA at no load - enables always-on subsystems without excessive battery drain in automotive applications. |
| Reference Voltage | 0.8 V ±1% - sets minimum output voltage; used with FB resistor divider to configure precise output levels (e.g., 3.3 V, 5 V). |
| High-Side RDS(on) | 92 mΩ typical - defines conduction loss at full load; impacts thermal design and efficiency at high current. |
| UVLO Threshold | 4.3 V rising, 4.0 V falling - internally fixed but adjustable via EN pin resistor divider for custom start-up behavior. |
| Shutdown Current | 2.25 μA max - ensures minimal leakage when disabled; critical for low-power sleep modes. |
Pinout & Package
TPS54340BQDDARQ1 uses an 8-pin HSOP (DDA) package with exposed thermal pad (PowerPAD™), measuring 4.89 mm × 3.90 mm, designed for high-power density and efficient PCB heat dissipation in automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor node | Supplies gate drive for high-side MOSFET; requires 0.1-μF X7R/X5R ceramic capacitor between BOOT and SW. |
| COMP | Error amplifier output | Connects to RC compensation network; controls PWM comparator threshold and regulates loop stability. |
| EN | Enable input with UVLO control | Pull below 1.2 V to disable; float or bias above threshold to enable; supports adjustable input UVLO with resistor divider. |
| FB | Inverting error amplifier input | Monitors output via resistor divider; compares to 0.8-V reference to regulate output voltage. |
| GND | Power and signal ground | Common return path; must be connected to exposed thermal pad for thermal and electrical performance. |
| RT/CLK | Frequency programming/sync input | Resistor-to-ground sets fSW; pulled above 1.55 V to enter PLL sync mode for external clock alignment. |
| SW | Switching node | Drain of internal high-side MOSFET; connects to external inductor and catch diode/capacitor. |
| VIN | Main input supply | Accepts 4.5–42 V; powers internal circuitry and high-side driver; includes 45-V absolute max rating. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces no-load current to 146 μA by disabling switching while maintaining regulation via controlled burst mode. |
| Integrated BOOT recharge FET | Enables >99% effective duty cycle and low-dropout operation without external diode, supporting VOUT up to ~VIN – 0.5 V. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation, HBM ±2000 V, CDM ±500 V - suitable for front-end automotive electronics. |
| Adjustable UVLO with hysteresis | EN pin supports custom start-up voltage (e.g., 9 V) and 325-mV hysteresis using two resistors, preventing brownout oscillation. |
| Overvoltage protection (OVP) | Disables high-side switch if output exceeds 106% of target; prevents damage to downstream 3.3-V/5-V logic during fault conditions. |
| Internal soft-start | 2.1-ms ramp time at 500 kHz - limits inrush current and eliminates output overshoot during power-up. |
Applications
| Vehicle ADAS Camera Power | USB Dedicated Charging Port |
|---|---|
Use Scenario: Powers image sensor and ISP in forward-facing camera module operating from 12-V battery with load-dump transients. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3-V/1.8-V rails; handles transient immunity and thermal cycling. Use Value: 45-V load-dump survival and 146-μA quiescent current extend system uptime and reduce parasitic drain during vehicle sleep mode. | Use Scenario: Supplies 5-V/1.5-A USB BC1.2 compliant charging port in automotive infotainment head unit. IC Role / Device Role / Timing Role: Constant-current/constant-voltage pre-regulator feeding secondary USB controller IC. Use Value: Adjustable switching frequency avoids AM-band interference; Eco-mode maintains efficiency at idle and light-load states. |
| Industrial Motor Drive Auxiliary Supply | 24-V Telecom Power Conversion |
Use Scenario: Generates isolated 5-V/3.3-V logic supply from unregulated 24-V DC bus in servo drive control board. IC Role / Device Role / Timing Role: Non-isolated buck stage providing clean, low-noise bias for gate drivers and microcontrollers. Use Value: 92-mΩ RDS(on) and thermal-enhanced HSOP package sustain 3.5-A load at 70°C ambient without derating. | Use Scenario: Converts 24-V telecom rack supply to 12-V intermediate rail for PoE midspan equipment. IC Role / Device Role / Timing Role: High-efficiency primary DC-DC stage operating at 600 kHz to minimize EMI and inductor size. Use Value: Synchronization via RT/CLK pin allows coordinated switching with other converters to reduce system-level ripple and noise. |
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 BOM cost; requires external compensation. | Targeted at multi-rail systems requiring lower EMI; lacks Eco-mode, higher 250-μA quiescent current. | Choose LM5143AQDPRRQ1 when dual outputs or EMI compliance outweigh single-rail efficiency and simplicity. |
| MPQ4333GQ-AEC1 | 42-V, 3.5-A monolithic buck with 150-μA quiescent current; fixed 2.2-MHz fSW; no RT/CLK sync or adjustable UVLO. | Optimized for space-constrained designs; limited frequency flexibility and no external clock sync capability. | Choose MPQ4333GQ-AEC1 for compact layouts where fixed high-frequency operation suffices and sync is unnecessary. |
Compared with LM5143AQDPRRQ1 and MPQ4333GQ-AEC1, the TPS54340BQDDARQ1 uniquely balances adjustable frequency, Eco-mode efficiency, and flexible UVLO tuning-making it optimal for single-output automotive subsystems requiring robustness, low standby loss, and design adaptability.
Availability
TPS54340BQDDARQ1 is available at Aetrix Electronics and suitable for automotive ADAS, industrial motor control, and 24-V telecom power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for TPS54340BQDDARQ1 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.
The TPS54340B-Q1 product line delivers high-voltage, high-current buck regulators engineered for automotive safety-critical and harsh-environment applications, emphasizing reliability, thermal resilience, and ISO 7637 transient immunity.
FAQ
What is the maximum input voltage the TPS54340BQDDARQ1 can withstand during load-dump events?
The TPS54340BQDDARQ1 is rated for 45-V absolute maximum input voltage and explicitly designed to survive ISO 7637-2 load-dump pulses up to 45 V. This rating applies to transient conditions only; continuous operation remains limited to 42 V. The device's internal protection circuits remain functional throughout such events without latch-up or degradation, ensuring reliable operation in automotive front-end power stages.
Does the TPS54340BQDDARQ1 require an external bootstrap diode?
No, the TPS54340BQDDARQ1 does not require an external bootstrap diode. It integrates a dedicated BOOT recharge FET that automatically refreshes the BOOT capacitor during low-side conduction, eliminating the need for an external diode and reducing BOM count and layout complexity while maintaining high-duty-cycle capability.
How does Eco-mode™ affect light-load efficiency in the TPS54340BQDDARQ1?
Eco-mode™ in the TPS54340BQDDARQ1 reduces no-load quiescent current to 146 μA by entering pulse-skipping mode-disabling switching cycles when output regulation is maintained. This directly improves light-load efficiency, especially below ~100 mA, by minimizing gate-drive and switching losses while preserving output accuracy and transient response.
Can the TPS54340BQDDARQ1 synchronize to an external clock signal?
Yes, the TPS54340BQDDARQ1 supports external clock synchronization via the RT/CLK pin. When pulled above 1.55 V, the pin transitions from resistor-programmed mode to high-impedance PLL input, accepting external clock edges. The internal PLL locks within 78 μs, enabling precise timing coordination across multiple converters to reduce system-level EMI.
What thermal considerations apply to the TPS54340BQDDARQ1 in HSOP PowerPAD™ package?
The TPS54340BQDDARQ1 in HSOP PowerPAD™ package has RθJA = 42°C/W on a standard 2-layer board. Effective thermal performance requires soldering the exposed thermal pad to a minimum 100-mm² copper pour with ≥4 thermal vias. Junction temperature must stay ≤150°C; derating begins above 125°C ambient unless enhanced PCB cooling is implemented.
TPS54340BQDDARQ1 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
- 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:
- 3.5A
- 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
TPS54340BQDDARQ1 FAQ
1.How can I place an order for TPS54340BQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54340BQDDARQ1 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 TPS54340BQDDARQ1 reliable?
The price and inventory of TPS54340BQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54340BQDDARQ1 is usually 5 days.
3.What payment methods are accepted for TPS54340BQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54340BQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54340BQDDARQ1?
TPS54340BQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54340BQDDARQ1 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 TPS54340BQDDARQ1?
For technical support, including TPS54340BQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54340BQDDARQ1 requirements.
6.How does Aetrix verify that TPS54340BQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54340BQDDARQ1 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 TPS54340BQDDARQ1 meets industry standards.
7.What is the process for return or replacement of TPS54340BQDDARQ1?
All TPS54340BQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54340BQDDARQ1, 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 TPS54340BQDDARQ1 part is unused and in its original packaging.
Return procedure for TPS54340BQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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