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Texas Instruments TPS54340BQDDAQ1
- Part No.:
- TPS54340BQDDAQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54340BQDDAQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:5,257
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Product details
Overview
TPS54340BQDDAQ1 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 N-channel MOSFET, Eco-mode™ pulse-skipping for light-load efficiency, and adjustable 100 kHz–2.5 MHz switching frequency. It delivers regulated output down to 0.8 V in an 8-pin HSOP PowerPAD™ package, used in vehicle ADAS, eCall, and 12/24-V industrial power systems.
For engineers reviewing the TPS54340BQDDAQ1 datasheet, TPS54340BQDDAQ1 pinout, TPS54340BQDDAQ1 application, or TPS54340BQDDAQ1 equivalent, key selection considerations include its 146-μA no-load quiescent current, internal 0.8-V ±1% reference, BOOT-recharge FET for low-dropout operation, RT/CLK synchronization capability, and thermal shutdown at 176°C with 12°C hysteresis.
Technical Context
The TPS54340BQDDAQ1 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 (77 μS during soft-start) and drives the COMP pin to regulate switch current via PWM comparator.
It supports dual operating modes on the RT/CLK pin: resistor-programmed frequency (100–2500 kHz) or external clock synchronization (160–2300 kHz), with PLL lock-in time of 78 μs. The integrated BOOT recharge FET enables >99% effective duty cycle, allowing output voltages up to VIN – (IO × RDS(on)) while maintaining gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 4.5 V to 42 V - supports automotive load-dump pulses up to 45 V per ISO 7637. |
| Output current | 3.5 A continuous - determined by thermal limits and internal 92-mΩ high-side MOSFET RDS(on). |
| Switching frequency | 100 kHz to 2.5 MHz - adjustable via RT resistor or external clock; enables optimization of efficiency vs. size. |
| Quiescent current | 146 μA at no load - enables low-power standby in always-on automotive modules. |
| Reference voltage | 0.8 V ±1% - sets minimum output voltage; used with FB resistor divider for precise regulation. |
| UVLO threshold | 4.3 V (rising), 3.975 V (falling) - internal hysteresis of 325 mV prevents chatter during brownout. |
| Thermal shutdown | 176°C with 12°C hysteresis - protects device under overload or poor heatsinking conditions. |
Pinout & Package
TPS54340BQDDAQ1 uses an 8-pin HSOP (DDA) package with exposed thermal pad (PowerPAD™), 4.89 mm × 3.90 mm body size. Thermal pad must be soldered to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOT | Bootstrap supply node | Connects to SW via 0.1-μF ceramic capacitor; supplies gate drive for high-side MOSFET; monitored for UVLO. |
| 2: VIN | Main input supply | 4.5–42 V input; powers internal circuitry and high-side driver; withstands 45-V load dump. |
| 3: EN | Enable control input | Pull below 1.2 V to disable; internal 1.2-μA pullup enables floating operation; supports adjustable UVLO with resistor divider. |
| 4: RT/CLK | Frequency programming/sync input | Resistor-to-GND sets fSW; external clock edges synchronize switching; internal PLL locks within 78 μs. |
| 5: FB | Feedback input | Inverting input of error amplifier; compares output voltage (via resistor divider) to 0.8-V reference. |
| 6: COMP | Error amplifier output | Drives PWM comparator; connects to external compensation network (R/C/C) for loop stability. |
| 7: GND | Power and signal ground | Common return for VIN, BOOT, COMP, FB, EN, RT/CLK; must connect to thermal pad. |
| 8: SW | Switching node | Source of internal high-side MOSFET; connects to external inductor and BOOT capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse skipping | Reduces no-load current to 146 μA by disabling switching when load is light; maintains regulation via controlled burst mode. |
| Integrated BOOT recharge FET | Enables >99% effective duty cycle without external diode; supports low dropout operation near VIN − VOUT ≈ 0 V. |
| Adjustable UVLO with hysteresis | Internal 4.3 V threshold + 325 mV hysteresis; extended threshold possible using EN pin resistor divider. |
| Current-mode control with slope compensation | Stabilizes loop at >50% duty cycle; eliminates need for external ramp generator; simplifies compensation design. |
| AEC-Q100 Grade 1 qualification | Rated for −40°C to +125°C ambient; HBM ESD Class H1C (±2 kV); CDM Class C3B (±500 V); qualified for automotive safety-critical systems. |
Applications
| ADAS Camera Power Supply | eCall Module DC-DC Stage |
|---|---|
|
Use Scenario: Powers image sensor and ISP in rear-view or surround-view camera modules requiring stable 1.8 V or 3.3 V from 12-V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, ripple-controlled output; handles 45-V load dump transients per ISO 7637. Use Value: 146-μA quiescent current extends battery life in parked surveillance mode; Eco-mode maintains efficiency across 10-μA to 3.5-A load range. |
Use Scenario: Generates 5 V for GSM/LTE modem and microcontroller in emergency call telematics units powered from 12/24-V automotive bus. IC Role / Device Role / Timing Role: High-reliability step-down converter with EN-controlled wake-up; supports fast start-up and fault recovery during ignition cycling. Use Value: Adjustable UVLO prevents brownout resets during cranking; thermal shutdown + frequency foldback protect against sustained overloads. |
| Industrial Motor Drive Auxiliary Rail | USB Dedicated Charging Port (DCP) |
|
Use Scenario: Supplies 5 V or 12 V to gate drivers, isolation logic, and MCU in 24-V motor control inverters operating in harsh factory environments. IC Role / Device Role / Timing Role: Robust auxiliary power source tolerant to EMI, vibration, and wide temperature swings (−40°C to +125°C). Use Value: HSOP PowerPAD™ package ensures reliable thermal dissipation without heatsink; 42-V max input accommodates regenerative braking spikes. |
Use Scenario: Implements BC1.2-compliant DCP functionality in automotive infotainment USB ports, delivering 5 V @ 1.5 A from 12-V supply. IC Role / Device Role / Timing Role: Fixed-output or adjustable buck stage preceding USB port controller; provides clean, low-noise 5-V rail. Use Value: 0.8-V reference + precision FB divider enables ±1% output accuracy; RT/CLK sync avoids beat frequencies with system clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQDQRQ1 | 42-V, 3-A, dual-channel synchronous buck with spread-spectrum and higher 3.5-A peak current limit; requires external compensation. | Targeted at multi-rail systems needing channel interleaving; lacks Eco-mode, higher no-load IQ (250 μA). | Choose LM5143AQDQRQ1 when dual outputs or EMI reduction are required; not drop-in due to different pinout and control architecture. |
| MPQ4333GQ-AEC1 | 42-V, 3.5-A monolithic buck with 150-μA IQ, but fixed 2.2-MHz fSW and no RT/CLK sync; lower RDS(on) (75 mΩ). | Optimized for compact layouts where fixed frequency suffices; no adjustable UVLO or BOOT recharge FET. | Choose MPQ4333GQ-AEC1 for space-constrained designs prioritizing minimal BOM count; not pin-compatible with TPS54340BQDDAQ1. |
Compared with LM5143AQDQRQ1 and MPQ4333GQ-AEC1, the TPS54340BQDDAQ1 uniquely combines Eco-mode efficiency, BOOT-recharge FET for ultra-low dropout, and flexible RT/CLK frequency control - making it optimal for single-rail automotive subsystems demanding wide input range, low quiescent power, and robust transient handling.
Availability
TPS54340BQDDAQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics eCall units, and industrial motor drive auxiliary rails requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for TPS54340BQDDAQ1 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 TPS54340BQDDAQ1 belongs to TI's automotive-qualified DC-DC converter portfolio, designed specifically for high-reliability 12/24-V vehicle subsystems requiring robustness against load dump, cold crank, and extended temperature operation.
FAQ
What is the maximum output current capability of the TPS54340BQDDAQ1?
The TPS54340BQDDAQ1 delivers up to 3.5 A continuous output current under recommended operating conditions (TJ ≤ 150°C, proper PCB thermal design). This rating is limited by thermal performance and the internal 92-mΩ high-side MOSFET's conduction loss. Peak current limit is 4.5–6.8 A depending on temperature and input voltage, per the datasheet's open-loop specification.
Does the TPS54340BQDDAQ1 support synchronization to an external clock?
Yes, the TPS54340BQDDAQ1 supports external clock synchronization via the RT/CLK pin. When driven with a clock signal exceeding the internal PLL thresholds (1.55–2.0 V high, 0.5–1.2 V low), the device enters CLK mode and synchronizes switching to the falling edge of the external clock, enabling noise-sensitive system timing alignment.
How does the Eco-mode™ function improve efficiency in the TPS54340BQDDAQ1?
Eco-mode™ in the TPS54340BQDDAQ1 reduces no-load input current to 146 μA by entering pulse-skipping mode when output load falls below ~30 mA. During Eco-mode, the COMP pin is clamped at 600 mV and switching pauses until output droop triggers regulation recovery - eliminating switching and gate-drive losses while maintaining tight voltage regulation.
What is the purpose of the BOOT pin and how should it be configured in the TPS54340BQDDAQ1?
The BOOT pin on the TPS54340BQDDAQ1 supplies gate drive voltage to the internal high-side MOSFET via a bootstrap capacitor connected between BOOT and SW. A 0.1-μF X7R/X5R ceramic capacitor rated ≥10 V is required. The device integrates a BOOT recharge FET, enabling >99% duty cycle operation without external components.
Is the TPS54340BQDDAQ1 qualified for automotive use, and what standards does it meet?
Yes, the TPS54340BQDDAQ1 is AEC-Q100 qualified (Grade 1: −40°C to +125°C ambient), with HBM ESD Class H1C (±2 kV) and CDM Class C3B (±500 V). It survives ISO 7637-2 load-dump pulses up to 45 V and operates across full automotive temperature and voltage ranges, making it suitable for safety-critical vehicle systems.
TPS54340BQDDAQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Eco-Mode™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
TPS54340BQDDAQ1 FAQ
1.How can I place an order for TPS54340BQDDAQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54340BQDDAQ1 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 TPS54340BQDDAQ1 reliable?
The price and inventory of TPS54340BQDDAQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54340BQDDAQ1 is usually 5 days.
3.What payment methods are accepted for TPS54340BQDDAQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54340BQDDAQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54340BQDDAQ1?
TPS54340BQDDAQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54340BQDDAQ1 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 TPS54340BQDDAQ1?
For technical support, including TPS54340BQDDAQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54340BQDDAQ1 requirements.
6.How does Aetrix verify that TPS54340BQDDAQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54340BQDDAQ1 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 TPS54340BQDDAQ1 meets industry standards.
7.What is the process for return or replacement of TPS54340BQDDAQ1?
All TPS54340BQDDAQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54340BQDDAQ1, 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 TPS54340BQDDAQ1 part is unused and in its original packaging.
Return procedure for TPS54340BQDDAQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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