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Texas Instruments TPS54340DDA
- Part No.:
- TPS54340DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54340DDA.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
TPS54340DDA from Texas Instruments is a 42 V input, 3.5 A synchronous step-down DC-DC converter with integrated 92 mΩ high-side MOSFET, current-mode control, Eco-mode™ pulse skipping for light-load efficiency, and adjustable 100 kHz–2.5 MHz switching frequency. It operates across –40°C to 150°C junction temperature and supports automotive load-dump survival up to 45 V.
For engineers reviewing the TPS54340DDA datasheet, TPS54340DDA pinout, TPS54340DDA application, or TPS54340DDA equivalent, key selection considerations include input UVLO adjustability via EN pin, BOOT-recharge FET integration enabling >99% duty cycle, 0.8 V ±1% reference accuracy, thermal/overvoltage/frequency-foldback protection, and HSOP PowerPAD™ package thermal performance.
Technical Context
The TPS54340DDA implements constant-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier (350 µS transconductance, 10,000 V/V DC gain) drives COMP to modulate high-side switch conduction time based on FB feedback and sensed inductor current.
A phase-locked loop (PLL) synchronizes switching to external clock edges at RT/CLK when voltage exceeds 1.55 V; below 1.2 V, it reverts to resistor-programmed frequency. Internal soft-start (2.1 ms at 500 kHz) controls output ramp rate, while frequency foldback reduces fSW during overcurrent or startup to maintain inductor current regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - Supports 12 V/24 V industrial and automotive systems with ISO 7637 load-dump tolerance up to 45 V. |
| Output Current | 3.5 A continuous - Delivers regulated power to microcontrollers, sensors, and communication ICs without external current boosting. |
| Switching Frequency | 100 kHz to 2.5 MHz - Enables optimization of inductor size (high fSW) or efficiency (low fSW) via RT resistor or external CLK sync. |
| Quiescent Current | 146 µA in Eco-mode - Minimizes standby power in always-on automotive modules and battery-backed systems. |
| Reference Voltage | 0.8 V ±1% - Enables precise output regulation from 0.8 V to 41.1 V using standard FB resistor dividers. |
| High-Side RDS(on) | 92 mΩ typical - Reduces conduction loss and thermal stress in compact 4.89 mm × 3.9 mm HSOP PowerPAD™ package. |
| Protection Features | Thermal shutdown (176°C), overvoltage transient protection (OVP), frequency foldback, and cycle-by-cycle current limit - Ensures robust operation under fault conditions without external circuitry. |
Pinout & Package
TPS54340DDA uses an 8-pin HSOP (High-Speed Small Outline Package) with exposed thermal pad (PowerPAD™), measuring 4.89 mm × 3.9 mm. The thermally enhanced construction enables θJCbot = 3.6 °C/W for efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects to SW via 0.1 µF ceramic capacitor; internal recharge FET enables >99% duty cycle operation down to VOUT ≈ VIN − 0.3 V. |
| VIN | Main input supply | Accepts 4.5–42 V; powers internal bias circuits and high-side gate driver; withstands 45 V transient per ISO 7637. |
| EN | Enable / UVLO control | Pull below 1.2 V to disable; float or tie to VIN for default enable; external resistors adjust UVLO threshold and hysteresis. |
| RT/CLK | Frequency programming / sync input | Resistor-to-GND sets fSW; >1.55 V triggers PLL sync mode - allows synchronization to external clock sources. |
| FB | Feedback input | Inverting input of error amplifier; compares divided VOUT against 0.8 V reference to regulate output voltage. |
| COMP | Error amplifier output | Drives PWM comparator; connects to external RC compensation network for loop stability across load/line variations. |
| GND | Analog & power ground | Common return for control circuitry; must be connected to thermal pad for proper thermal and electrical performance. |
| SW | Switch node | Drain of internal high-side MOSFET; connects to external inductor and bootstrap capacitor; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces no-load input current to 146 µA by disabling switching while maintaining regulation via controlled burst-mode operation. |
| Integrated BOOT recharge FET | Eliminates need for external bootstrap diode, enabling high-duty-cycle operation and simplifying layout in low-VOUT/VIN ratio designs. |
| Adjustable UVLO with hysteresis | EN pin supports resistor-divider configuration to set custom start/stop thresholds (e.g., 12 V system with 9 V dropout margin). |
| Internal soft-start | 2.1 ms ramp time at 500 kHz prevents inrush current and output overshoot during power-up or recovery from fault. |
| Overvoltage transient protection (OVP) | Shuts off high-side MOSFET if VOUT exceeds 106% of target, then resumes regulation only after decay below threshold - protects downstream loads. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Regulates 5 V or 3.3 V rail for microcontroller, CAN transceiver, and sensor interface in vehicle door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck converter supplying core logic power; handles cold-crank (4.5 V) and load-dump (45 V) transients without reset or latch-up. Use Value: Eco-mode™ maintains <150 µA quiescent draw during sleep mode; integrated protection eliminates need for external TVS or supervisor ICs. | Use Scenario: Generates isolated 12 V or 24 V auxiliary rail from 48 V backplane in programmable logic controller chassis. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter; operates continuously at full load with thermal management via PowerPAD™ and PCB copper pour. Use Value: 92 mΩ RDS(on) and 42 V max input support high conversion ratio with minimal heatsinking; frequency foldback prevents saturation during short-circuit events. |
| Telecom Remote Radio Unit (RRU) | Medical Patient Monitoring Sensor Hub |
Use Scenario: Powers FPGA, ADC, and RF front-end in outdoor base station equipment requiring wide temperature (-40°C to +85°C ambient) and high reliability. IC Role / Device Role / Timing Role: Main point-of-load regulator; synchronized to system clock via RT/CLK to reduce EMI in dense RF environments. Use Value: PLL-based clock sync enables deterministic switching edge alignment; 150°C max junction rating ensures long-term reliability under sealed enclosure thermal stress. | Use Scenario: Supplies stable 3.3 V to low-noise analog front-end and wireless BLE module in portable diagnostic devices with battery backup. IC Role / Device Role / Timing Role: Low-quiescent, low-noise power source; operates in Eco-mode™ during patient idle periods to extend battery life. Use Value: 146 µA operating current and 1 µA shutdown current minimize self-discharge; 0.8 V reference enables accurate calibration of precision ADC references. |
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 |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65 V input, 0.6 A output, 1.5 MHz max fSW, no Eco-mode, higher RDS(on) (220 mΩ) | Targeted for automotive infotainment with AEC-Q100 Grade 1; lower current rating limits use in high-power sensor hubs. | Select when wider input range (>42 V) and AEC-Q100 qualification are mandatory, but output current ≤0.6 A suffices. |
| MP2451DT-LF-Z | 4.5–36 V input, 0.6 A output, fixed 2.2 MHz fSW, no UVLO adjustment, no BOOT recharge FET | Cost-optimized for consumer electronics; lacks load-dump survival and thermal shutdown hysteresis. | Choose for space-constrained, low-cost applications where 36 V max input and 0.6 A output are acceptable and automotive robustness is not required. |
Compared with LM5164QPWPRQ1 and MP2451DT-LF-Z, the TPS54340DDA delivers 3.5 A continuous current with integrated BOOT recharge and adjustable UVLO - making it uniquely suited for demanding 12 V/24 V industrial and automotive power rails where efficiency, thermal resilience, and transient robustness are critical.
Availability
TPS54340DDA is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, and telecom remote radio units requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS54340DDA 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 power management technologies, with decades of expertise in high-reliability power conversion ICs.
The TPS54340DDA belongs to TI's SWIFT™ family of high-voltage buck regulators, designed specifically for ruggedized 12 V, 24 V, and 48 V industrial and automotive power systems requiring wide input range, high efficiency at light loads, and comprehensive fault protection.
FAQ
What is the minimum input voltage required for TPS54340DDA to start switching?
The TPS54340DDA has an internally set undervoltage lockout (UVLO) threshold of 4.3 V (typical), with 325 mV hysteresis. It begins switching when VIN rises above ~4.3 V and remains active until VIN falls below ~3.975 V. This threshold can be increased using external resistors on the EN pin to match system-level brownout requirements.
Does TPS54340DDA require an external bootstrap diode?
No, the TPS54340DDA integrates a bootstrap recharge FET, eliminating the need for an external diode. A 0.1 µF ceramic capacitor between BOOT and SW is sufficient. This integration enables reliable high-duty-cycle operation and simplifies PCB layout compared to discrete bootstrap solutions.
How does Eco-mode™ improve light-load efficiency in TPS54340DDA?
Eco-mode™ in the TPS54340DDA reduces switching activity at light loads by entering pulse-skipping mode when peak inductor current falls below ~500 mA. This lowers input quiescent current to 146 µA, significantly improving efficiency at loads below 100 mA - ideal for always-on automotive and IoT applications.
Can TPS54340DDA synchronize to an external clock signal?
Yes, the TPS54340DDA supports synchronization via its RT/CLK pin. When the voltage on this pin exceeds 1.55 V, the internal PLL engages and locks to falling edges of an external clock signal (160–2300 kHz range), enabling EMI reduction and deterministic timing in multi-rail systems.
What thermal performance can be expected from the TPS54340DDA HSOP PowerPAD™ package?
The TPS54340DDA in HSOP-8 PowerPAD™ package achieves θJCbot = 3.6 °C/W and θJA = 42.0 °C/W on a standard 2-layer JEDEC board. Proper PCB layout - including ≥250 mm² exposed copper connected to the thermal pad - is essential to sustain 3.5 A continuous output under 85°C ambient conditions.
TPS54340DDA 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
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54340DDA FAQ
1.How can I place an order for TPS54340DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54340DDA 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 TPS54340DDA reliable?
The price and inventory of TPS54340DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54340DDA is usually 5 days.
3.What payment methods are accepted for TPS54340DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54340DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54340DDA?
TPS54340DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54340DDA 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 TPS54340DDA?
For technical support, including TPS54340DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54340DDA requirements.
6.How does Aetrix verify that TPS54340DDA is sourced from the original manufacturer or authorized distributors?
All TPS54340DDA 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 TPS54340DDA meets industry standards.
7.What is the process for return or replacement of TPS54340DDA?
All TPS54340DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54340DDA, 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 TPS54340DDA part is unused and in its original packaging.
Return procedure for TPS54340DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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