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Texas Instruments LMR14030SSQDDAQ1
- Part No.:
- LMR14030SSQDDAQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14030SSQDDAQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,590
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Product details
Overview
LMR14030SSQDDAQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous step-down DC-DC converter with integrated 90 mΩ high-side MOSFET, 4 V to 40 V input range, 3.5 A continuous output current, 40 µA quiescent current in sleep mode, and 75 ns minimum on-time - designed for battery regulation in engine control units and ADAS power domains.
For engineers reviewing the LMR14030SSQDDAQ1 datasheet, LMR14030SSQDDAQ1 pinout, LMR14030SSQDDAQ1 application, or LMR14030SSQDDAQ1 equivalent, key selection considerations include its spread-spectrum EMI reduction capability, precision enable input for sequencing, internal loop compensation, thermal shutdown at 170°C, and compatibility with 200 kHz–2.5 MHz frequency programming or external synchronization.
Technical Context
The LMR14030SSQDDAQ1 implements fixed-frequency peak current mode control with slope compensation to prevent sub-harmonic oscillation above 50% duty cycle. It operates in Sleep-mode at light load to maintain 40 µA IQ, and transitions to full switching when output deviation exceeds regulation window.
Its bootstrap circuit enables up to ~97% effective duty cycle during dropout, refreshed via SW node conduction; the RT/SYNC pin supports either resistor-programmed frequency (200 kHz–2.5 MHz) or PLL-based synchronization (250 kHz–2.3 MHz), with spread-spectrum dithering ±6% for EMI suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports direct connection to automotive battery rails including cold-crank (4.5 V) and load-dump (40 V) transients. |
| Output Current | 3.5 A continuous - delivers regulated power to microcontrollers, sensors, and communication ICs without external heatsinking in typical PCB layouts. |
| Quiescent Current | 40 µA in sleep mode - extends battery life in always-on vehicle modules such as telematics and body controllers. |
| Switching Frequency | 200 kHz to 2.5 MHz - adjustable via RT resistor or external clock; higher frequencies reduce inductor size, lower frequencies improve light-load efficiency. |
| High-Side RDS(on) | 90 mΩ typical - minimizes conduction loss and thermal rise at full load, enabling compact 4.9 mm × 6 mm HSOIC package operation. |
| Feedback Reference | 0.750 V ±1.5% over –40°C to +125°C - enables precise output voltage setting (e.g., 3.3 V or 5 V) using standard 1% resistors with minimal temperature drift. |
| Min. On-Time | 75 ns - supports high VIN-to-VOUT conversion ratios (e.g., 24 V → 3.3 V at 2.2 MHz) without pulse-skipping instability. |
| Thermal Shutdown | 170°C with 12°C hysteresis - protects die under sustained overload or poor airflow; resumes operation only after junction cools below 158°C. |
Pinout & Package
LMR14030SSQDDAQ1 uses an 8-pin HSOIC (DDA) package with exposed PowerPAD™ thermal pad (4.9 mm × 6 mm), optimized for automotive board space and thermal dissipation. The package features GND-connected thermal pad soldered to PCB ground plane for low RθJA of 43.2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Connects 0.1 µF X7R ceramic capacitor to SW; supplies gate drive voltage for high-side MOSFET during ON phase. |
| VIN | Main power input | Accepts 4–40 V; requires local 10 µF+ ceramic bypass capacitor placed within 3 mm of pin to minimize high-frequency noise coupling. |
| EN | Enable control | Precision analog input with 1.2 V threshold and internal 1 µA pull-up; supports system-level UVLO via external resistor divider. |
| RT/SYNC | Frequency control | Configurable as timing resistor node (200 kHz–2.5 MHz) or high-impedance sync input (250 kHz–2.3 MHz); includes PLL lock-in time of 100 µs. |
| FB | Voltage feedback | High-impedance input referenced to 0.75 V; connects to resistor divider from VOUT to set output voltage with <±1% accuracy. |
| SS | Soft-start ramp | Internal 3 µA current source charges external CSS capacitor; sets monotonic VOUT ramp time (e.g., 10 ms with 33 nF). |
| GND | System ground | Power and signal return; must be connected to thermal pad and low-impedance PCB ground plane for stable regulation and EMI control. |
| SW | Switch node | Drives external power inductor; exhibits fast edge rates requiring tight layout with minimized loop area to reduce radiated emissions. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±6% frequency dithering reduces peak EMI by >10 dB across 150 kHz–1 GHz band - critical for CISPR 25 Class 5 compliance in infotainment systems. |
| Internal compensation | Eliminates need for external Type II/III compensation network; reduces BOM count by ≥3 components and design validation effort for stable loop response. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation, HBM ±2 kV / CDM ±750 V ESD, and 15-year automotive reliability - suitable for powertrain and safety-critical ECUs. |
| Ultra-low shutdown current | 1 µA max shutdown IQ - preserves battery charge during vehicle sleep mode (e.g., >30 days without recharge in parked ADAS camera modules). |
| Adjustable UVLO hysteresis | Configurable start/stop thresholds (e.g., 12.5 V / 11.8 V) via EN divider resistors - prevents brownout oscillation during battery voltage sag in start-stop systems. |
| Thermal foldback protection | Reduces switching frequency and limits peak current when die temperature exceeds 150°C - maintains safe operation without abrupt shutdown in high-ambient environments. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12 V battery rail to 3.3 V/5 V for engine control unit (ECU) microcontrollers and CAN transceivers under cold-crank (4.5 V) and load-dump (40 V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise, and thermally robust DC power with AEC-Q100 compliance. Use Value: Maintains stable output during 4–40 V transients while consuming only 40 µA in sleep mode - enabling always-on diagnostics without battery drain. | Use Scenario: Powering programmable logic controllers (PLCs) and industrial I/O modules from wide-range 24 V DC supplies subject to line fluctuations and EMI. IC Role / Device Role / Timing Role: High-efficiency, spread-spectrum-enabled step-down converter delivering 3.5 A with minimal filtering requirements. Use Value: Reduces conducted/radiated EMI by >10 dB versus fixed-frequency alternatives - simplifies EMC certification for factory automation equipment. |
| Telecom/Datacom Systems | General Purpose Wide Vin Regulation |
Use Scenario: Generating intermediate 5 V or 3.3 V rails from 48 V telecom backplane in base station remote radio units (RRUs) operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Input-transient-hardened buck converter supporting high VIN-to-VOUT ratios with 75 ns min-on-time and 97% duty cycle capability. Use Value: Enables single-stage conversion from 48 V to 3.3 V at 2.2 MHz - shrinking solution size by eliminating cascaded regulators and reducing inductor volume by 40%. | Use Scenario: Providing flexible 3.5 A power for test equipment, medical monitors, and portable instrumentation powered from universal AC adapters or Li-ion batteries. IC Role / Device Role / Timing Role: General-purpose automotive-qualified buck regulator with programmable frequency, soft-start, and precision enable for multi-rail sequencing. Use Value: Supports rapid prototyping with internal compensation and pin-compatible family options (2 A / 5 A) - accelerating design reuse across product variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14030QDPRRQ1 | Same electrical specs but in 10-pin WSON (4 mm × 4 mm) package with PGOOD pin; RθJA = 36.5°C/W vs 43.2°C/W. | Preferred where board space is constrained and power-good signaling is required for system monitoring. | Select when footprint reduction and PGOOD flag are prioritized over HSOIC's legacy manufacturability and thermal pad accessibility. |
| LMR14020SQDDARQ1 | 2 A version in identical 8-pin HSOIC package; shares same pinout, FB reference, and feature set except reduced current limit (3.2 A typ) and higher RDS(on) (120 mΩ). | Suitable for lower-power domains like instrument clusters or HVAC controls where 2 A suffices. | Choose for cost-sensitive or thermally limited designs where 3.5 A headroom is unnecessary - retains full layout compatibility. |
Compared with LMR14030QDPRRQ1, LMR14030SSQDDAQ1 offers easier thermal management via exposed PowerPAD™ but lacks PGOOD; versus LMR14020SQDDARQ1, it delivers 75% higher current in the same footprint with lower conduction loss - making it optimal for high-density automotive power rails demanding both performance and qualification rigor.
Availability
LMR14030SSQDDAQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, industrial PLCs, telecom RRUs, and general-purpose wide-Vin power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LMR14030SSQDDAQ1 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 deep expertise in automotive-grade reliability and functional safety.
The LMR14030SSQDDAQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for robust, low-EMI DC-DC conversion in harsh automotive environments - emphasizing AEC-Q100 qualification, thermal resilience, and simplified design-in.
FAQ
What is the maximum input voltage rating for the LMR14030SSQDDAQ1?
The LMR14030SSQDDAQ1 has an absolute maximum input voltage rating of 44 V on the VIN pin, with recommended operating range from 4 V to 40 V. This allows reliable operation during automotive load-dump events up to 40 V while maintaining regulation and protection integrity - confirmed per Section 5.1 Absolute Maximum Ratings in the official datasheet.
Does the LMR14030SSQDDAQ1 support external frequency synchronization?
Yes, the LMR14030SSQDDAQ1 supports external synchronization via the RT/SYNC pin, accepting square-wave clocks from 250 kHz to 2.3 MHz with defined thresholds (VSYNC_HI ≥ 1.7 V, VSYNC_LO ≤ 0.5 V) and minimum pulse width of 30 ns. PLL lock-in time is 100 µs, and the internal oscillator disables automatically when sync edges are detected - detailed in Section 5.6 Switching Characteristics.
How does the spread-spectrum feature of the LMR14030SSQDDAQ1 reduce EMI?
The LMR14030SSQDDAQ1 implements spread-spectrum modulation by dithering the switching frequency ±6% around the center value, spreading energy across a wider bandwidth and lowering peak radiated emissions by >10 dB. This is validated in CISPR 25 testing and eliminates need for additional EMI filters in automotive infotainment and ADAS modules - specified in Section 1 Features and Section 6.3.8.
What is the purpose of the SS pin on the LMR14030SSQDDAQ1?
The SS (soft-start) pin on the LMR14030SSQDDAQ1 controls output voltage ramp-up time using an internal 3 µA current source that charges an external capacitor (CSS) to generate a linear 0–0.75 V ramp. This prevents inrush current into output capacitors and downstream loads - with ramp time calculable as tSS = (CSS × 0.75 V) / 3 µA, per Section 6.3.7.
Is the LMR14030SSQDDAQ1 pin-compatible with other devices in the LMR140xx-Q1 family?
Yes, the LMR14030SSQDDAQ1 in the 8-pin HSOIC (DDA) package is pin-compatible with LMR14020SQDDARQ1 (2 A) and LMR14050SQDDARQ1 (5 A), sharing identical pinout, FB reference, enable behavior, and feature set - enabling scalable power design with no PCB changes. This is explicitly stated in the "Description" section and Table of Device Information.
LMR14030SSQDDAQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- 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):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 200kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR14030SSQDDAQ1 FAQ
1.How can I place an order for LMR14030SSQDDAQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14030SSQDDAQ1 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 LMR14030SSQDDAQ1 reliable?
The price and inventory of LMR14030SSQDDAQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14030SSQDDAQ1 is usually 5 days.
3.What payment methods are accepted for LMR14030SSQDDAQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14030SSQDDAQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14030SSQDDAQ1?
LMR14030SSQDDAQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14030SSQDDAQ1 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 LMR14030SSQDDAQ1?
For technical support, including LMR14030SSQDDAQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14030SSQDDAQ1 requirements.
6.How does Aetrix verify that LMR14030SSQDDAQ1 is sourced from the original manufacturer or authorized distributors?
All LMR14030SSQDDAQ1 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 LMR14030SSQDDAQ1 meets industry standards.
7.What is the process for return or replacement of LMR14030SSQDDAQ1?
All LMR14030SSQDDAQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR14030SSQDDAQ1, 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 LMR14030SSQDDAQ1 part is unused and in its original packaging.
Return procedure for LMR14030SSQDDAQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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