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Texas Instruments LMR14030SDDAR
- Part No.:
- LMR14030SDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14030SDDAR.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,788
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Product details
Overview
LMR14030SDDAR from Texas Instruments is a 40V input, 3.5A synchronous step-down DC-DC converter with integrated 90mΩ high-side MOSFET, 40µA quiescent current, 2.2MHz switching capability, and internal compensation - designed for automotive battery regulation and industrial power supplies where wide VIN range and low IQ are critical.
For engineers reviewing the LMR14030SDDAR datasheet, LMR14030SDDAR pinout, LMR14030SDDAR application, or LMR14030SDDAR equivalent, key selection criteria include input voltage range (4–40V), output current capability (3.5A continuous), ultra-low IQ (40µA), programmable frequency (200kHz–2.5MHz), and thermal performance in HSOIC-8 PowerPAD™ package.
Technical Context
The LMR14030SDDAR implements fixed-frequency peak current mode control with sleep-mode operation at light load to maintain high efficiency. It features internal loop compensation, adjustable soft-start via external capacitor, and precision enable with UVLO hysteresis.
Its architecture supports high-duty-cycle operation (up to 97%) using bootstrap recharge circuitry, includes cycle-by-cycle current limiting, thermal shutdown at 170°C, output overvoltage protection (109% VREF), and synchronization to external clock (250kHz–2.3MHz) with PLL lock-in time of 100µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports direct connection to automotive battery (9–16V nominal) and industrial rails up to 36V without pre-regulation. |
| Output Current | 3.5A continuous - delivers full rated load with thermal derating per RθJA = 43.2°C/W in HSOIC-8 PowerPAD™. |
| Quiescent Current | 40µA - enables >1-year battery life in always-on systems such as telematics or ECU wake-up circuits. |
| Switching Frequency | 2.2MHz - allows use of small 2.2µH inductors and compact ceramic output capacitors for space-constrained designs. |
| High-Side RDS(on) | 90mΩ typical - reduces conduction loss at 3.5A, enabling >90% efficiency at 12V→5V/2A (fSW = 500kHz). |
| Feedback Reference | 0.750V ±1.2% - sets output voltage via resistor divider; enables precise 3.3V, 5V, or custom outputs with <±1% tolerance. |
| Min. On-Time | 75ns - supports high VIN-to-VOUT ratios (e.g., 36V→3.3V) without pulse-skipping at 2.2MHz. |
| Shutdown Current | 1µA - ensures negligible battery drain during system sleep or storage modes. |
Pinout & Package
LMR14030SDDAR uses an 8-pin HSOIC package with exposed thermal pad (DDA), measuring 4.9mm × 6mm. The PowerPAD™ thermal pad must be soldered to PCB ground plane for optimal thermal performance (RθJC(bot) = 7.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Connects 0.1µF X7R ceramic capacitor to SW; provides gate drive voltage for high-side MOSFET during ON-time. |
| VIN | Main input supply | Accepts 4–40V; requires local high-frequency bypass capacitor (e.g., 10µF ceramic + 100nF) placed near pin. |
| EN | Enable control | Precision threshold (1.2V typ); internal pull-up enables operation when floating; supports external UVLO divider for system-level sequencing. |
| RT/SYNC | Frequency control | Configurable as resistor-set oscillator (200kHz–2.5MHz) or external clock input (250kHz–2.3MHz) with PLL synchronization. |
| FB | Voltage feedback | Senses output via resistor divider; internal 0.75V reference enables accurate output regulation across temperature (-40°C to +125°C). |
| SS | Soft-start control | 3µA internal current source charges external capacitor; controls output ramp rate to limit inrush current on power-up. |
| GND | Power and signal ground | Common return for VIN, FB, EN, SS, RT/SYNC; connects to thermal pad for heat dissipation. |
| SW | Switch node | Drives external inductor; internally connected to high-side MOSFET drain; requires low-inductance layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates need for external compensation network - reduces BOM count and design iteration time for stable operation with common output capacitors. |
| Frequency Synchronization | Enables noise-sensitive systems (e.g., RF modules) to align switching edges with system clock, avoiding beat frequencies and EMI peaks. |
| Thermal Shutdown with Hysteresis | Shuts down at 170°C junction temperature and restarts after 12°C cooldown - prevents thermal runaway while allowing safe recovery in transient overload conditions. |
| Output Overvoltage Protection | Clamps FB at 109% VREF to disable high-side switch instantly - protects downstream logic (e.g., microcontrollers, sensors) from transient overshoot during load dump or startup. |
| Bootstrap Recharge Circuit | Maintains BOOT-SW ≥3.2V during 97% duty cycle operation - enables dropout operation down to VIN – VOUT ≈ 0.5V at 3.5A without external low-side FET. |
| Current Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response - simplifies stability analysis and improves load step immunity in dynamic applications. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery to 5V/3.3V for infotainment, ADAS camera modules, or body control units under cold-crank (4.5V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, stabilized DC power with UVLO hysteresis and OVP to meet ISO 16750-2 requirements. Use Value: 40µA IQ extends battery life during vehicle sleep mode; 40V absolute max rating withstands load-dump transients without external TVS. | Use Scenario: Powering PLC I/O modules, motor drives, or fieldbus interfaces from unregulated 24V industrial rails subject to brownouts and surges. IC Role / Device Role / Timing Role: High-reliability point-of-load converter delivering 3.5A with thermal foldback and short-circuit protection in harsh environments. Use Value: Internal current limiting and thermal shutdown prevent latch-up during cable short events; 43.2°C/W RθJA enables convection-cooled operation up to 125°C ambient. |
| Telecom/Datacom Systems | Battery-Powered Systems |
Use Scenario: Generating intermediate 5V or 3.3V rails from 48V backplane in access switches or optical line terminals with strict EMI limits. IC Role / Device Role / Timing Role: Synchronized buck converter operating at 2.2MHz to avoid noise in sensitive analog/RF sections and enable compact filter design. Use Value: RT/SYNC pin allows alignment with system clock; 75ns min on-time supports 48V→3.3V conversion without pulse-skipping at high frequency. | Use Scenario: Powering portable medical monitors, handheld test equipment, or IoT edge nodes from single-cell Li-ion (3.0–4.2V) or two-cell packs (6–8.4V). IC Role / Device Role / Timing Role: Efficient step-down regulator with ultra-low IQ and programmable soft-start to maximize runtime and prevent brownout during wake-up bursts. Use Value: 1µA shutdown current minimizes self-discharge; 40µA sleep-mode IQ enables multi-year operation in sensor wake-on-motion applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14020SDDAR | 2A output current, same 4–40V input, identical pinout and package - lower RDS(on) (75mΩ) but reduced current capability. | Suitable for lower-power loads (e.g., MCU-only boards); cannot support 3.5A continuous without thermal derating. | Select when load current ≤2A and board space/layout reuse is prioritized over headroom. |
| LMR14050SDDAR | 5A output current, same 4–40V input, identical pinout and package - higher RDS(on) (60mΩ) and slightly higher IQ (45µA). | Supports higher-current peripherals (e.g., FPGA core rails, multi-sensor hubs); requires more aggressive thermal management. | Select when future-proofing for >3.5A loads or parallel operation is required; shares footprint and control interface. |
Compared with LMR14020SDDAR and LMR14050SDDAR, the LMR14030SDDAR offers optimal balance of current capability (3.5A), thermal performance (RθJA = 43.2°C/W), and ultra-low IQ (40µA) - making it ideal for mid-power automotive and industrial applications where both efficiency and reliability are critical.
Availability
LMR14030SDDAR is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and telecom/datacom systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMR14030SDDAR 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 DC-DC conversion.
The LMR14030SDDAR belongs to TI's SIMPLE SWITCHER® power converter family - engineered for ease of design, robust operation in harsh environments, and broad applicability across automotive, industrial, and communications infrastructure.
FAQ
What is the maximum input voltage rating for the LMR14030SDDAR?
The LMR14030SDDAR has an absolute maximum input voltage rating of 44V on the VIN pin, with recommended operating range from 4V to 40V. This 40V upper limit ensures reliable operation under automotive load-dump conditions (per ISO 16750-2) and industrial surge events without requiring external clamping components.
Does the LMR14030SDDAR require external compensation components?
No, the LMR14030SDDAR features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces bill-of-materials count, and ensures stable operation across a wide range of output capacitors - including low-ESR ceramics commonly used in space-constrained applications.
Can the LMR14030SDDAR operate in dropout mode, and what is its minimum controllable on-time?
Yes, the LMR14030SDDAR supports high-duty-cycle operation up to ~97% via its bootstrap recharge circuit, enabling dropout operation down to VIN – VOUT ≈ 0.5V at 3.5A. Its minimum controllable on-time is 75ns, which allows stable 2.2MHz operation even at high input-to-output voltage ratios like 36V→3.3V.
How does the LMR14030SDDAR handle overcurrent and short-circuit conditions?
The LMR14030SDDAR employs cycle-by-cycle peak current limiting on the high-side MOSFET and adds frequency foldback (dividing fSW by 2/4/8) when FB drops to 75%/50%/25% of VREF. This dual-layer protection limits average inductor current, reduces power dissipation, and prevents thermal damage during sustained overloads or hard shorts.
What thermal management considerations apply to the LMR14030SDDAR in HSOIC-8 PowerPAD™ package?
The LMR14030SDDAR's HSOIC-8 PowerPAD™ package requires the exposed thermal pad to be soldered to a dedicated PCB ground plane with ≥4 thermal vias (0.3mm diameter, spaced ≤1.5mm apart). With this layout, its junction-to-board thermal resistance is 7.8°C/W, enabling 3.5A operation at +85°C ambient without forced airflow - verified per JEDEC JESD51-7.
LMR14030SDDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR14030SDDAR FAQ
1.How can I place an order for LMR14030SDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14030SDDAR 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 LMR14030SDDAR reliable?
The price and inventory of LMR14030SDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14030SDDAR is usually 5 days.
3.What payment methods are accepted for LMR14030SDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14030SDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14030SDDAR?
LMR14030SDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14030SDDAR 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 LMR14030SDDAR?
For technical support, including LMR14030SDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14030SDDAR requirements.
6.How does Aetrix verify that LMR14030SDDAR is sourced from the original manufacturer or authorized distributors?
All LMR14030SDDAR 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 LMR14030SDDAR meets industry standards.
7.What is the process for return or replacement of LMR14030SDDAR?
All LMR14030SDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR14030SDDAR, 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 LMR14030SDDAR part is unused and in its original packaging.
Return procedure for LMR14030SDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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