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Texas Instruments TPS54340DDAR
- Part No.:
- TPS54340DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54340DDAR.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
TPS54340DDAR 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 TPS54340DDAR datasheet, TPS54340DDAR pinout, TPS54340DDAR application, or TPS54340DDAR equivalent, key selection considerations include input voltage range (4.5–42 V), continuous output current capability (3.5 A), internal 0.8 V ±1% reference, BOOT-SW UVLO monitoring, and RT/CLK synchronization support for noise-sensitive systems.
Technical Context
The TPS54340DDAR implements constant-frequency peak current-mode control with 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 based on FB feedback and sensed inductor current.
It integrates BOOT recharge FET, internal soft-start (2.1 ms at 500 kHz), overvoltage transient protection (OVP trips at 106% VOUT), frequency foldback during overload, and thermal shutdown (176°C with 12°C hysteresis). The EN pin enables adjustable UVLO via external resistors and provides 1.2 V threshold with hysteresis.
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 rails including ISO 7637 load dump pulses up to 45 V. |
| Output Current | 3.5 A continuous - delivers stable regulated power without external current-sense amplifiers or discrete high-side switches. |
| Switching Frequency | 100 kHz to 2.5 MHz - adjustable via RT resistor or synchronizable to external clock for EMI reduction and multi-rail coordination. |
| Quiescent Current | 146 µA in Eco-mode - enables battery-backed or always-on systems with minimal standby drain. |
| Reference Voltage | 0.8 V ±1% - sets minimum output voltage; combined with FB divider, enables precise regulation from 0.8 V to 41.1 V. |
| High-Side RDS(on) | 92 mΩ typical at VIN = 12 V - reduces conduction loss and thermal stress in high-current buck stages. |
| Shutdown Current | 1 µA - ensures near-zero power draw when disabled, critical for safety-critical or energy-harvesting applications. |
| Junction Temp Range | –40°C to 150°C - qualified for under-hood automotive, industrial motor drives, and harsh-environment power supplies. |
Pinout & Package
TPS54340DDAR uses an 8-pin HSOP (High-Speed Small Outline Package) with exposed PowerPAD™ thermal pad (4.89 mm × 3.9 mm body). The PowerPAD must be soldered to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects to SW via 0.1 µF ceramic capacitor; supplies gate drive voltage for integrated 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. |
| EN | Enable / UVLO control | Pull below 1.2 V to disable; float or tie to VIN for default enable; external resistor divider adjusts start/stop thresholds. |
| RT/CLK | Frequency programming / sync input | Resistor-to-ground sets fSW (100–2500 kHz); pulled >1.55 V to enter PLL sync mode with external clock. |
| FB | Feedback sense input | Inverting input of error amplifier; connects to resistor divider from VOUT to set output voltage per VREF = 0.8 V. |
| COMP | Error amplifier output | Drives PWM comparator; connect Type II/III compensation network between COMP and FB/GND for stability. |
| GND | Analog & power ground | Common reference for control circuitry; must be low-impedance and tied to PowerPAD for thermal path. |
| SW | Switch node | Drain of internal high-side MOSFET and source of external low-side diode or synchronous rectifier; high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ Pulse Skipping | Reduces no-load quiescent 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; enables 100% duty-cycle operation and simplifies layout in high-VIN-to-VOUT ratio designs. |
| Adjustable UVLO with Hysteresis | EN pin allows user-defined input undervoltage lockout (e.g., 6 V start / 5.6 V stop) using two resistors, improving system brownout resilience. |
| Overvoltage Transient Protection (OVP) | Shuts off high-side MOSFET if VOUT exceeds 106% of target, preventing damage to downstream loads during line transients or feedback faults. |
| Internal Soft-Start | 2.1 ms ramp time at 500 kHz prevents inrush current and output overshoot; automatically resets during overcurrent faults for safe recovery. |
| Frequency Foldback | Reduces fSW during startup and overload to limit peak inductor current and maintain control loop stability without external intervention. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power |
|---|---|
Use Scenario: Regulating 12 V battery input to 3.3 V or 5 V for microcontrollers, CAN transceivers, and sensor interfaces in vehicle door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and load-dump-robust power domain with Eco-mode extending sleep-mode battery life. Use Value: Survives 45 V load dumps per ISO 7637; 146 µA quiescent current minimizes parasitic drain during vehicle off-state; EN pin enables wake-on-CAN functionality. | Use Scenario: Converting 24 V DC field bus to 5 V/3.3 V for programmable logic controller (PLC) digital I/O channels, analog front-ends, and communication interfaces. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator delivering stable 3.5 A output with thermal shutdown and OVP protection in DIN-rail mounted enclosures. Use Value: –40°C to 150°C operation suits uncooled industrial cabinets; 92 mΩ RDS(on) reduces heat generation; RT/CLK sync avoids beat frequencies with other system clocks. |
| Telecom Remote Radio Unit (RRU) | Test & Measurement Equipment |
Use Scenario: Generating 5 V or 12 V from 48 V backplane for FPGA, ADC/DAC, and RF front-end bias supplies in outdoor base station radios. IC Role / Device Role / Timing Role: Input-stage buck converter handling wide input variation (36–72 V) while maintaining tight output regulation and low EMI via synchronized switching. Use Value: 100 kHz–2.5 MHz fSW range allows optimization for size (high fSW) or efficiency (low fSW); BOOT UVLO ensures reliable startup even with degraded input capacitance. | Use Scenario: Providing precision 3.3 V or 5 V rails for high-speed data acquisition boards, oscilloscope front-ends, and calibration subsystems requiring low-noise, stable power. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator powering sensitive analog circuitry with minimal thermal drift and ripple-induced measurement error. Use Value: 0.8 V ±1% internal reference enables accurate output setting; current-mode control improves line/load transient response; soft-start prevents meter overshoot during power-up. |
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 |
|---|---|---|---|
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 65 V max input, 0.6 A output, lower current rating but higher VIN tolerance and integrated VCC LDO. | Better suited for 48 V telecom or HEV/EV auxiliary rails where input surges exceed 42 V; not drop-in due to lower current and different compensation structure. | Select LM5164QDDARQ1 only when 65 V input rating or AEC-Q100 qualification is mandatory; TPS54340DDAR remains preferred for 3.5 A industrial 12/24 V systems. |
| MP2451DT-LF-Z | 36 V max input, 0.6 A output, fixed 2.2 MHz fSW, no Eco-mode, smaller TSOT23-6 package, no BOOT UVLO or OVP. | Targeted at space-constrained, low-power consumer applications; lacks automotive robustness, thermal protection, and light-load efficiency features. | Choose MP2451DT-LF-Z only for cost-sensitive, low-current (<0.6 A), non-safety-critical designs where board area is primary constraint. |
Compared with LM5164QDDARQ1 and MP2451DT-LF-Z, the TPS54340DDAR uniquely balances 3.5 A output, 42 V input, Eco-mode efficiency, and comprehensive protection (OVP, thermal, frequency foldback) in a thermally enhanced HSOP package-making it optimal for mid-power industrial and automotive buck conversion where reliability and design flexibility are critical.
Availability
TPS54340DDAR is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS54340DDAR 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.
The TPS54340DDAR belongs to TI's high-voltage buck converter product line, engineered specifically for robust, high-efficiency DC-DC conversion in 12 V, 24 V, and 48 V systems where load-dump immunity, wide temperature operation, and light-load efficiency are essential.
FAQ
What is the maximum input voltage the TPS54340DDAR can withstand during load dump events?
The TPS54340DDAR is rated for absolute maximum input voltage of 45 V and is explicitly designed to survive ISO 7637-2 load dump pulses up to that level. Its internal circuitry-including BOOT UVLO, thermal shutdown, and overvoltage protection-ensures continued operation or safe shutdown during such transients without latch-up or permanent damage. Always use appropriate input filtering per TI's layout guidelines to ensure reliable performance.
Does the TPS54340DDAR require an external bootstrap diode?
No, the TPS54340DDAR integrates a BOOT recharge FET, eliminating the need for an external bootstrap diode. This simplifies bill-of-materials and PCB layout while enabling reliable 100% duty-cycle operation. A 0.1 µF X7R/X5R ceramic capacitor (10 V rating minimum) must still be placed between BOOT and SW terminals per the datasheet recommendations.
How does Eco-mode™ operate in the TPS54340DDAR, and what is its impact on output voltage ripple?
Eco-mode™ in the TPS54340DDAR activates below ~31 mA load (depending on inductor value) by clamping COMP at 600 mV and skipping switching cycles. This reduces quiescent current to 146 µA but increases low-frequency output ripple (typically <10 kHz). Ripple magnitude depends on output capacitance and ESR; TI recommends ≥22 µF ceramic + bulk capacitance to keep ripple within 1% of VOUT in Eco-mode applications.
Can the TPS54340DDAR synchronize to an external clock, and what are the timing requirements?
Yes, the TPS54340DDAR supports synchronization via the RT/CLK pin. When pulled above 1.55 V, it enters PLL sync mode and accepts external clock edges (160–2300 kHz range). Minimum CLK pulse width is 15 ns; falling-edge-triggered sync ensures deterministic phase alignment. PLL lock time is 78 µs. Synchronization helps reduce EMI in multi-rail systems and avoids beat frequencies.
What thermal management practices are required for the TPS54340DDAR in continuous 3.5 A operation?
For continuous 3.5 A operation, the TPS54340DDAR requires proper thermal design: the exposed PowerPAD must be soldered to a minimum 200 mm² copper pour connected to internal/external ground planes via ≥4 thermal vias (0.3 mm diameter). With this, θJA is 42.0°C/W. At full load and 12 V input, junction temperature rise is ~147°C above ambient-so ambient must stay ≤3°C for 150°C max TJ. Derate output current above 85°C ambient per the thermal curves in the datasheet.
TPS54340DDAR 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
- 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
TPS54340DDAR FAQ
1.How can I place an order for TPS54340DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54340DDAR 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 TPS54340DDAR reliable?
The price and inventory of TPS54340DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54340DDAR is usually 5 days.
3.What payment methods are accepted for TPS54340DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54340DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54340DDAR?
TPS54340DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54340DDAR 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 TPS54340DDAR?
For technical support, including TPS54340DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54340DDAR requirements.
6.How does Aetrix verify that TPS54340DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54340DDAR 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 TPS54340DDAR meets industry standards.
7.What is the process for return or replacement of TPS54340DDAR?
All TPS54340DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54340DDAR, 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 TPS54340DDAR part is unused and in its original packaging.
Return procedure for TPS54340DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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