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LMR14030SSQDDARQ1
Texas Instruments
IC REG BUCK ADJ 3.5A 8SOPWR
20304 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 3.5A 8-PowerSOIC (0.154", 3.90mm Width)
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LMR14030SSQDDARQ1
Product Overview
1348286
DiGi Electronics Part Number
LMR14030SSQDDARQ1-DGManufacturer
Texas Instruments
LMR14030SSQDDARQ1
Description
IC REG BUCK ADJ 3.5A 8SOPWRInventory
20304 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 3.5A 8-PowerSOIC (0.154", 3.90mm Width)
Quantity
Minimum 1
Minimum 1
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LMR14030SSQDDARQ1 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
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
Package / Case
8-PowerSOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SO PowerPad
Base Product Number
LMR14030
Datasheet & Documents
HTML Datasheet
LMR14030SSQDDARQ1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-43400-6
296-43400-2
296-43400-1
LMR14030SSQDDARQ1-DG
-296-43400-1-DG
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Their affordable pricing encourages me to explore more of their solutions.
de desembre 02, 2025
Their customer service team genuinely cares about customer satisfaction.
de desembre 02, 2025
Their team is always approachable and ready to assist, which boosts my confidence in shopping with them.
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Frequently Asked Questions (FAQ)
What are the key design-in considerations when using the LMR14030SSQDDARQ1 in an automotive environment with wide input voltage transients?
When designing the LMR14030SSQDDARQ1 into automotive systems, engineers must account for its 4V to 40V input range to handle load dump and cold crank events. However, because the device lacks synchronous rectification, efficiency drops under light loads due to diode conduction losses. To mitigate thermal risk, ensure adequate copper thermal relief and ground pad connection to a thermal plane. Additionally, use input transient protection (e.g. TVS diodes) if exposure exceeds 40V is possible. The AEC-Q100 qualification supports robustness, but proper layout and external compensation are critical to maintaining loop stability under voltage transients.
Can the LMR14030SSQDDARQ1 replace the LM25145 in a 12V to 3.3V, 3A industrial power rail, and what trade-offs should be evaluated?
The LMR14030SSQDDARQ1 can replace the LM25145 in a 12V to 3.3V, 3A application, but key trade-offs exist. While both support automotive-grade operation, the LMR14030SSQDDARQ1 operates up to 2.5MHz but uses non-synchronous rectification, leading to lower efficiency—especially at light loads—compared to the synchronous LM25145. The LMR14030SSQDDARQ1 also requires an external catch diode, increasing component count. Ensure the Schottky diode (e.g., 3A rated, low VF) is minimized in loop area to reduce EMI and thermal stress. Evaluate thermal performance under worst-case ambient conditions due to higher power dissipation in the diode.
How does switching frequency selection affect EMI and efficiency in the LMR14030SSQDDARQ1, and what is the recommended range for noise-sensitive applications?
The LMR14030SSQDDARQ1 allows switching frequency adjustment from 200kHz to 2.5MHz, which directly impacts EMI and efficiency. Frequencies below 500kHz may interfere with AM band or control loops but offer better efficiency due to lower switching losses. For noise-sensitive applications, setting the frequency above 1.8MHz moves fundamental noise out of sensitive bands, but increases core and gate drive losses. Use frequency dithering via the RT resistor if available, and always verify EMI with a near-field probe. Keep in mind that higher frequencies demand tighter PCB layout and higher-grade input ceramics to avoid ringing and overshoot on the SW node.
What are the reliability risks when operating the LMR14030SSQDDARQ1 near its maximum 3.5A output current in a 40°C ambient environment?
Operating the LMR14030SSQDDARQ1 near its 3.5A limit in 40°C ambient increases junction temperature and long-term reliability risks. Without synchronous rectification, conduction losses in the external diode and inductor dominate, leading to thermal accumulation. Use thermal imaging or calculate power dissipation (considering VIN, VOUT, diode VF, and DCR) to ensure TJ remains below 110°C with margin to the 125°C limit. Poor thermal vias under the PowerPad or insufficient copper area increase failure risk. Derate current to 2.8A or lower if forced airflow or heatsinking isn't available. Monitor thermal shutdown behavior during load transients.
What layout best practices minimize voltage spikes and noise coupling when integrating the LMR14030SSQDDARQ1 in a densely packed PCB?
To minimize voltage spikes and noise in dense layouts with the LMR14030SSQDDARQ1, keep the high-current hot loop—VIN, input capacitor, SW, catch diode, and inductor—as small as possible. Place 10µF ceramic capacitors (X7R, 50V) within 2mm of the VIN and GND pins. Use a solid ground plane on an adjacent layer, but avoid placing sensitive signals underneath the SW node. Expose and solder the PowerPad to the thermal ground plane with multiple vias. Route feedback traces away from noisy nodes, and consider shielding if operating above 1MHz. A poorly optimized layout can cause false current limiting, erratic regulation, or EMI failures despite the device being AEC-Q100 qualified.
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