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LM2575SX-ADJ/NOPB
Texas Instruments
IC REG BUCK ADJ 1A DDPAK
35253 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.23V 1 Output 1A TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
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5.0 / 5.0
- (119 Ratings)
LM2575SX-ADJ/NOPB
Product Overview
1303391
DiGi Electronics Part Number
LM2575SX-ADJ/NOPB-DGManufacturer
Texas Instruments
LM2575SX-ADJ/NOPB
Description
IC REG BUCK ADJ 1A DDPAKInventory
35253 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.23V 1 Output 1A TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Quantity
Minimum 1
Minimum 1
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LM2575SX-ADJ/NOPB 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)
1.23V
Voltage - Output (Max)
37V
Current - Output
1A
Frequency - Switching
52kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package
TO-263 (DDPAK-5)
Base Product Number
LM2575
Datasheet & Documents
Manufacturer Product Page
LM2575SX-ADJ/NOPB Specifications
HTML Datasheet
LM2575SX-ADJ/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM2575SX-ADJ/NOPBTRINACTIVE-NDR
LM2575SX-ADJ-NDR
-LM2575SX
296-LM2575SX-ADJ/NOPB
296-LM2575SX-ADJ/NOPB-DG
LM2575SX-ADJ/NOPBCTINACTIVE
LM2575SX-ADJ/NOPBTRINACTIVE
LM2575SX-ADJ/NOPBTR-NDR
LM2575SXADJNOPB
296-LM2575SX-ADJ/NOPBDKR
LM2575SX-ADJ/NOPBTR-DG
LM2575SX-ADJ/NOPBTR
LM2575SX-ADJ/NOPBDKR
LM2575SX-ADJ/NOPBCT
296-LM2575SX-ADJ/NOPBTR
NATNSCLM2575SX-ADJ/NOPB
LM2575SX-ADJ/NOPBDKRINACTIVE-NDR
LM2575SX-ADJ/NOPBCT-NDR
2156-LM2575SX-ADJ/NOPB-TI
*LM2575SX-ADJ/NOPB
LM2575SX-ADJ/NOPBCT-DG
296-LM2575SX-ADJ/NOPBCT
LM2575SX-ADJ/NOPBDKRINACTIVE
LM2575SX-ADJ/NOPBDKR-DG
LM2575SX-ADJ/NOPBDKR-NDR
-LM2575SX-ADJ/NOPB-NDR
Standard Package
500
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
L’attention qu’ils portent à l’emballage se voit, chaque composant arrive parfaitement protégé.
de desembre 02, 2025
Die Lieferzeit war beeindruckend kurz. Die Verpackung war professionell gemacht und hat meine Bestellung bestens geschützt, keine Beschädigungen.
de desembre 02, 2025
DiGi Electronics offers exceptional after-sales support; their response time is remarkably quick and always helpful when I have technical questions.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the LM2575SX-ADJ/NOPB in a high-vibration industrial environment, and how can layout and component selection mitigate them?
The LM2575SX-ADJ/NOPB, housed in a TO-263 package, is susceptible to mechanical stress in high-vibration settings due to its surface-mount construction. Poor PCB layout or inadequate thermal pad soldering can lead to intermittent connections or premature failure. To mitigate this, use a robust solder stencil with sufficient paste volume for the thermal tab, secure the board with proper mounting hardware, and avoid placing the regulator near flex points. Additionally, select input/output capacitors with solid polymer or ceramic dielectrics instead of standard aluminum electrolytics, which are more prone to mechanical fatigue. Reinforce the ground plane under the device and consider conformal coating to reduce micro-crack propagation over time.
Can the LM2575SX-ADJ/NOPB reliably replace an LM2596 in a 12V-to-5V, 800mA application, and what design changes are necessary?
While both are buck regulators, the LM2575SX-ADJ/NOPB (52kHz switching frequency) and LM2596 (150kHz) differ significantly in efficiency, component sizing, and transient response. Direct replacement is possible but not drop-in: the LM2575SX-ADJ/NOPB requires a larger output inductor (typically 100µH vs. 33µH for LM2596) and different compensation. In a 12V-to-5V, 800mA design, ensure the inductor’s saturation current exceeds 1.5A and use low-ESR output capacitors (e.g., 100µF ceramic or tantalum). Also, verify thermal performance—the LM2575SX-ADJ/NOPB dissipates more heat at lower frequencies, so a grounded copper pour under the tab is essential. Expect slightly lower efficiency (~75% vs. ~85%), but better EMI characteristics due to lower switching frequency.
How does the absence of synchronous rectification in the LM2575SX-ADJ/NOPB impact efficiency at light loads, and what workaround can improve performance below 100mA?
The LM2575SX-ADJ/NOPB uses a diode-based freewheeling path instead of a synchronous MOSFET, leading to higher conduction losses at light loads (<100mA), where efficiency can drop below 60%. This makes it poorly suited for battery-powered or always-on systems without power gating. To mitigate this, add a bypass switch (e.g., a low-quiescent-current LDO like the TPS7A02) that activates only during light-load conditions, or implement pulse-skipping mode via external control if feasible. Alternatively, consider migrating to a synchronous buck like the TPS54332 for high-efficiency light-load operation, though this increases BOM complexity and cost.
What are the thermal derating considerations for the LM2575SX-ADJ/NOPB when operating near its 40V input limit in a sealed enclosure with ambient temperatures above 50°C?
At 40V input and high ambient temperatures (>50°C), the LM2575SX-ADJ/NOPB experiences significant power dissipation due to voltage differential losses, especially at 1A load. Without adequate heatsinking, junction temperature can exceed the 125°C limit, triggering thermal shutdown or reducing lifespan. Use a thermal via array under the DDPAK tab connected to an internal ground plane, and ensure minimal thermal resistance to ambient. Derate output current by ~30% above 50°C ambient—e.g., limit to 700mA at 60°C. If sustained high-power operation is required, consider adding an external heatsink or switching to a higher-efficiency topology like the LM2675 (which offers better thermal performance in similar conditions).
Is the LM2575SX-ADJ/NOPB suitable for automotive 12V battery systems with load dump transients up to 40V, and what protection circuitry is recommended?
The LM2575SX-ADJ/NOPB’s 40V absolute maximum input voltage makes it marginally suitable for automotive 12V systems, where load dump events can exceed 35V and briefly reach 40V—leaving no safety margin. To ensure reliability, add a transient voltage suppressor (TVS) diode rated for 36–39V clamping (e.g., SMAJ36A) at the input, along with a 47–100µF low-ESR input capacitor placed close to the IC. Include a reverse-polarity protection diode (e.g., SB560) if the system lacks it upstream. For harsh environments, consider upgrading to the LM5575 (42V max, AEC-Q100 qualified) for guaranteed automotive robustness, as the LM2575SX-ADJ/NOPB lacks formal automotive qualification despite its wide input range.
Quality Assurance (QC)
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LM2575SX-ADJ/NOPB CAD Models
Texas Instruments LM2575SX-ADJ/NOPB PCB symbols & footprints
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