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Texas Instruments TPS54340QDDARQ1
- Part No.:
- TPS54340QDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54340QDDARQ1.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,554
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Product details
Overview
TPS54340QDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 4.5–42 V input, 3.5-A synchronous step-down DC-DC converter with integrated 92-mΩ high-side MOSFET, 146-μA Eco-mode™ quiescent current, and adjustable 100 kHz–2.5 MHz switching frequency. It delivers regulated output voltages down to 0.8 V in vehicle accessories, ADAS power rails, and industrial 12/24-V systems.
For engineers reviewing the TPS54340QDDARQ1 datasheet, TPS54340QDDARQ1 pinout, TPS54340QDDARQ1 application, or TPS54340QDDARQ1 equivalent, key selection considerations include its load-dump survivability up to 45 V (ISO 7637), internal soft-start ramp control, BOOT-recharge FET for low-dropout operation, and RT/CLK pin synchronization capability - all validated for automotive ambient temperatures from –40°C to 125°C.
Technical Context
The TPS54340QDDARQ1 implements constant-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier features 350 μA/V transconductance during normal operation and reduced 77 μA/V during soft-start, referenced to a 0.8 V ±1% internal voltage reference.
Switching frequency is set via resistor on RT/CLK (100–2500 kHz) or synchronized to external clock edges; frequency foldback activates during overcurrent or startup. The integrated BOOT recharge FET enables >99% effective duty cycle, supporting output voltages near VIN minimum (e.g., 5 V out from 5.2 V in).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports 12-V and 24-V automotive batteries including ISO 7637 load-dump transients up to 45 V. |
| Output Current | 3.5 A continuous - sustained delivery without thermal shutdown under proper PCB thermal design (RθJB = 23.4°C/W). |
| Switching Frequency | 100 kHz to 2.5 MHz - adjustable via RT resistor or external clock; enables optimization of efficiency (low fSW) or filter size (high fSW). |
| Quiescent Current | 146 μA in Eco-mode™ - enables >1000-hour battery standby in always-on automotive modules (e.g., eCall, GPS). |
| Feedback Reference | 0.8 V ±1% - sets minimum output voltage; enables precise regulation across –40°C to 125°C ambient with <±2 mV drift. |
| High-Side RDS(on) | 92 mΩ typical - reduces conduction loss at full load; contributes to >90% peak efficiency at 3.3 V/2 A with 12 V input. |
| UVLO Threshold | 4.3 V rising, 4.1 V falling - internally fixed but externally adjustable via EN pin resistor divider for custom start-up sequencing. |
Pinout & Package
TPS54340QDDARQ1 is housed in an 8-pin HSOP (DDA) package with exposed thermal pad (4.89 mm × 3.90 mm), requiring solder connection of the thermal pad to PCB ground plane for thermal performance (RθJB = 23.4°C/W).
| 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 by internal UVLO to prevent shoot-through. |
| COMP | Error amplifier output | Interface for Type II/III compensation network; controls PWM comparator threshold; clamped at 600 mV during Eco-mode™. |
| EN | Enable & UVLO control | Pull below 1.2 V to disable; internal pullup enables floating operation; external resistor divider adjusts UVLO threshold and hysteresis. |
| FB | Feedback input | Inverting input of transconductance error amplifier; compares output voltage (via resistor divider) to 0.8 V reference for regulation. |
| GND | Power and signal ground | Common return for power stage, control circuitry, and thermal pad; must be low-impedance connection to PCB ground plane. |
| RT/CLK | Frequency programming/sync | Resistor-to-ground sets fSW (100–2500 kHz); pulled above 1.55 V to enter PLL sync mode with external clock falling edge. |
| SW | Switching node | Drain of internal high-side MOSFET and source of external low-side diode/FET; high dv/dt node requiring tight layout and snubber if needed. |
| VIN | Main power input | 4.5–42 V supply input; includes internal 4.3 V UVLO; requires local 10-μF ceramic input capacitor near device. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces no-load IQ to 146 μA while maintaining regulation - critical for automotive always-on systems with strict battery drain limits. |
| Integrated BOOT recharge FET | Enables >99% duty cycle operation without external diode - supports ultra-low dropout (e.g., 5 V out from 5.2 V in) and simplifies BOM. |
| Current-mode control with slope compensation | Ensures stable operation at duty cycles >50% without external compensation - eliminates risk of subharmonic oscillation in high-VIN/low-VOUT designs. |
| Internal soft-start ramp | Controls output voltage rise time (2.1 ms at 500 kHz) - prevents inrush current and overshoot during cold crank or hot plug-in events. |
| Frequency foldback | Reduces fSW during overload or startup - maintains control loop stability and limits peak inductor current during fault conditions. |
Applications
| Vehicle GPS & Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering 3.3-V image sensor, ISP, and USB interface in automotive rear-view camera under cold-crank (5.5 V) and load-dump (45 V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 3.3 V with fast transient response and Eco-mode™ for parking-mode battery conservation. Use Value: Survives ISO 7637 Pulse 5a (45 V/100 ms); 146-μA quiescent current extends parking-mode runtime; integrated BOOT FET avoids dropout during engine cranking. |
Use Scenario: Generating 1.8-V core supply for radar processor in forward collision warning system operating from 12-V battery with wide temperature range. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with AEC-Q100 Grade 1 qualification and thermal shutdown protection at 176°C junction. Use Value: 92-mΩ RDS(on) minimizes heat generation in sealed enclosure; 0.8-V reference enables accurate 1.8-V output via resistor divider; RT/CLK sync aligns switching to avoid EMI with RF front-end. |
| USB Dedicated Charging Port (DCP) | Industrial 24-V Fieldbus Node |
Use Scenario: Providing 5-V/1.5-A USB charging output in automotive center console, compliant with BC1.2 and requiring robust overvoltage protection. IC Role / Device Role / Timing Role: Constant-voltage buck controller with OVP comparator that disables high-side MOSFET if output exceeds 106% of setpoint. Use Value: Internal OVP eliminates need for external crowbar circuit; 100-kHz–2.5-MHz fSW allows compact magnetics; EN pin enables controlled power-up sequence with host MCU. |
Use Scenario: Converting 24-V industrial bus to isolated 5-V logic supply for Profibus/Modbus gateway in factory automation cabinet. IC Role / Device Role / Timing Role: Input-stage buck converter handling wide-input transients (e.g., 24 V ±20%) and providing stable 5-V rail to downstream isolated DC-DC. Use Value: 42-V max input withstands 24-V bus surges; thermal shutdown (176°C) protects against enclosure overheating; HSOIC PowerPAD enables conduction cooling in dense layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQDPRRQ1 | 42-V, 3-A, dual-channel synchronous buck with spread-spectrum and higher 3.5-A peak current limit; requires external BOOT diode. | Targeted at multi-rail systems needing channel interleaving; lacks Eco-mode™, so IQ = 2.5 mA (vs. 146 μA). | Choose LM5143AQDPRRQ1 when dual outputs or EMI reduction via spread-spectrum are required; not suitable for ultra-low-IQ battery-backed use cases. |
| MPQ4333GQ-AEC1 | 40-V, 3.5-A monolithic buck with 150-μA IQ and similar Eco-mode™, but only 100 kHz–2.2 MHz fSW range and no RT/CLK sync capability. | Qualified to AEC-Q100 Grade 1 but lacks ISO 7637 load-dump validation; uses QFN-12 package (no PowerPAD). | Choose MPQ4333GQ-AEC1 for cost-sensitive designs where sync is unnecessary and thermal pad connection is impractical. |
Compared with LM5143AQDPRRQ1 and MPQ4333GQ-AEC1, the TPS54340QDDARQ1 uniquely combines ISO 7637-compliant load-dump survival, 146-μA Eco-mode™ IQ, RT/CLK synchronization, and thermally enhanced HSOIC PowerPAD - making it optimal for single-rail automotive subsystems demanding reliability, low standby drain, and EMI control.
Availability
TPS54340QDDARQ1 is available at Aetrix Electronics and suitable for vehicle accessories, ADAS power supplies, and industrial 24-V fieldbus nodes requiring stable component supply across extended temperature and automotive lifecycle requirements.
Supply support for TPS54340QDDARQ1 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 ICs, with decades of automotive qualification expertise.
The TPS54340-Q1 product line delivers high-voltage, high-current synchronous buck regulators engineered specifically for automotive power systems - emphasizing AEC-Q100 compliance, load-dump resilience, and low-quiescent-current operation in harsh environments.
FAQ
What is the maximum input voltage the TPS54340QDDARQ1 can withstand during load-dump events?
The TPS54340QDDARQ1 is designed to survive ISO 7637 load-dump pulses up to 45 V, verified per AEC-Q100 stress testing. Its absolute maximum input rating is 45 V, and internal circuitry remains functional during transient exposure - enabling direct connection to automotive 12-V and 24-V battery rails without external TVS clamping in many implementations. This capability is confirmed in the device's qualification report and electrical characteristics table.
Does the TPS54340QDDARQ1 require an external bootstrap diode?
No, the TPS54340QDDARQ1 integrates a BOOT recharge FET, eliminating the need for an external bootstrap diode. A 0.1-μF ceramic capacitor between BOOT and SW suffices for gate-drive energy storage and refresh. This integration reduces BOM count, improves reliability, and enables >99% duty cycle operation - a key differentiator versus discrete-bootstrap competitors like the LM5143AQDPRRQ1.
How does Eco-mode™ operate in the TPS54340QDDARQ1, and what is its impact on output ripple?
Eco-mode™ in the TPS54340QDDARQ1 activates when load current drops below ~31 mA (dependent on inductor value), clamping COMP at 600 mV and halting switching to reduce IQ to 146 μA. During this mode, output voltage decays until the error amplifier lifts COMP above threshold, triggering burst-mode recovery. This causes higher low-frequency output ripple versus forced-PWM, but ripple remains within specification for most automotive always-on functions such as GPS backup or CAN node keep-alive.
Can the TPS54340QDDARQ1 synchronize to an external clock, and what are the timing requirements?
Yes, the TPS54340QDDARQ1 synchronizes to external clocks via the RT/CLK pin: when pulled above 1.55 V, it enters PLL sync mode and locks to falling edges of an external clock signal. Minimum CLK pulse width is 15 ns, and PLL lock time is 78 μs at 500 kHz. This feature enables EMI reduction by aligning switching edges across multiple converters in complex automotive ECUs.
What thermal design guidance applies to the TPS54340QDDARQ1's HSOIC PowerPAD package?
The TPS54340QDDARQ1's DDA package requires the exposed thermal pad to be soldered to a dedicated PCB copper area connected to GND. TI specifies RθJB = 23.4°C/W on a 2-layer board with 1-in² thermal pad; increasing copper area and adding thermal vias improves performance. For 3.5-A continuous operation at 125°C ambient, ≥4 thermal vias (0.3-mm diameter) under the pad and ≥2-in² total GND copper are recommended to maintain TJ ≤150°C.
TPS54340QDDARQ1 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):
- 41V
- 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
TPS54340QDDARQ1 FAQ
1.How can I place an order for TPS54340QDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54340QDDARQ1 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 TPS54340QDDARQ1 reliable?
The price and inventory of TPS54340QDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54340QDDARQ1 is usually 5 days.
3.What payment methods are accepted for TPS54340QDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54340QDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54340QDDARQ1?
TPS54340QDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54340QDDARQ1 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 TPS54340QDDARQ1?
For technical support, including TPS54340QDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54340QDDARQ1 requirements.
6.How does Aetrix verify that TPS54340QDDARQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54340QDDARQ1 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 TPS54340QDDARQ1 meets industry standards.
7.What is the process for return or replacement of TPS54340QDDARQ1?
All TPS54340QDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54340QDDARQ1, 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 TPS54340QDDARQ1 part is unused and in its original packaging.
Return procedure for TPS54340QDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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