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LM5021MM-2
Texas Instruments
IC OFFLINE SW MULT TOP 8VSSOP
8219 Pcs New Original In Stock
Converter Offline Flyback, Forward Topology Up to 1MHz 8-VSSOP
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5.0 / 5.0
- (88 Ratings)
LM5021MM-2
Product Overview
1358216
DiGi Electronics Part Number
LM5021MM-2-DGManufacturer
Texas Instruments
LM5021MM-2
Description
IC OFFLINE SW MULT TOP 8VSSOPInventory
8219 Pcs New Original In Stock
Converter Offline Flyback, Forward Topology Up to 1MHz 8-VSSOP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM5021MM-2 Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
-
Series
-
Product Status
Discontinued at Digi-Key
Output Isolation
Isolated
Internal Switch(s)
No
Voltage - Breakdown
-
Topology
Flyback, Forward
Voltage - Start Up
20 V
Voltage - Supply (Vcc/Vdd)
8V ~ 30V
Duty Cycle
50%
Frequency - Switching
Up to 1MHz
Fault Protection
Current Limiting, Over Load
Control Features
Frequency Control, Soft Start, Sync
Operating Temperature
-40°C ~ 125°C (TJ)
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package
8-VSSOP
Mounting Type
Surface Mount
Base Product Number
LM5021
Datasheet & Documents
Manufacturer Product Page
LM5021MM-2 Specifications
Design Resources
Load Detecting Pwr Supply RD-166
HTML Datasheet
LM5021MM-2-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM5021MM2
LM5021MM-2CT
LM5021MM-2DKR
LM5021MM-2TR
Standard Package
1,000
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
DiGi Electronics überzeugt durch schnellen Versand und exzellenten Kundenservice. Absolut empfehlenswert.
de desembre 02, 2025
Fast shipping and attentive customer care—top-notch service.
de desembre 02, 2025
Their thoughtful packaging minimizes packaging waste while maximizing protection.
de desembre 02, 2025
The protective packaging prevented any damage despite the transit process.
de desembre 02, 2025
I felt welcomed and valued thanks to their friendly customer care.
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Frequently Asked Questions (FAQ)
Can the LM5021MM-2 be used in a high-frequency flyback converter design above 800kHz without stability issues, and what PCB layout considerations should I follow to ensure reliable operation?
Yes, the LM5021MM-2 supports switching frequencies up to 1MHz, making it suitable for designs above 800kHz. However, at these frequencies, parasitic inductance and capacitance can cause ringing and noise coupling. To maintain stability, minimize trace lengths for the RT/CT timing components and keep the current-sense and gate drive paths short and direct. Use a solid ground plane and shield sensitive nodes. Also, ensure proper bypassing of the VCC pin with a low-ESR 1µF ceramic capacitor placed close to the IC. These steps mitigate risks of erratic switching or false over-current triggering in high-frequency flyback applications using the LM5021MM-2.
Is the LM5021MM-2 a viable drop-in replacement for the UC3844 in an existing forward converter, and what design adjustments are required?
The LM5021MM-2 is not a direct pin-to-pin replacement for the UC3844, but it can replace it in forward converters with circuit modifications. Key differences include the LM5021MM-2’s higher maximum switching frequency (up to 1MHz vs. 500kHz) and different start-up voltage (20V vs. ~16V). You must verify the startup bias supply can reach 20V. Additionally, the LM5021MM-2 lacks an internal regulator, so ensure VCC is properly derived from the auxiliary winding. Adjust RT/CT values for desired frequency and check current sense resistor values to match the LM5021MM-2’s 1V current-limit threshold. Designers should also confirm SOA margins for MOSFETs due to potentially faster switching transitions.
How does the lack of internal switch in the LM5021MM-2 affect my BOM and thermal design in an isolated offline power supply?
Since the LM5021MM-2 does not include an internal power switch, you must add an external MOSFET, increasing BOM count but offering flexibility in MOSFET selection. This allows optimization for voltage rating, RDS(on), and thermal performance based on your input voltage and power level. Designers must account for gate drive losses and ensure the LM5021MM-2’s gate driver output can source/sink sufficient current (typically ~1A peak) to switch the MOSFET rapidly, minimizing switching losses. A gate resistor between 5Ω and 22Ω is recommended to control dV/dt and prevent ringing. Thermal design must include heatsinking for the external MOSFET and transformer, especially in enclosed environments operating at full load.
What are the reliability risks of using the LM5021MM-2 in a 125°C ambient industrial application, and how can I mitigate long-term degradation?
The LM5021MM-2 is rated for junction temperatures up to 125°C, but sustained operation near this limit can accelerate aging and reduce system reliability. In high-ambient environments, ensure adequate PCB copper for heat dissipation and consider reducing switching frequency to lower internal power losses. Avoid prolonged overload conditions, as thermal stress on connected components (like the MOSFET and transformer) compounds. Additionally, because the LM5021MM-2 is discontinued at Digi-Key, ensure a long-term supply strategy by purchasing sufficient stock or qualifying the pin-compatible LM5021MMX-2 variant. Use conformal coating in harsh environments to prevent moisture-induced leakage currents that could affect startup behavior.
How does the LM5021MM-2 compare to the NCP1252 in terms of fault protection and suitability for cost-sensitive, isolated AC-DC flyback supplies?
The LM5021MM-2 offers more design flexibility than the NCP1252 due to its higher switching frequency (up to 1MHz vs. 100kHz) and support for both flyback and forward topologies, but it requires an external MOSFET, increasing BOM cost. In contrast, the NCP1252 integrates a MOSFET, simplifying designs for low-power applications. For fault protection, both provide over-current and over-load protection, but the LM5021MM-2 allows more precise current sensing and external fault management via its control features. Use the LM5021MM-2 when performance, efficiency, or higher power (>15W) is critical; switch to NCP1252 for sub-15W, cost-driven designs where integration reduces component count. Ensure proper current sense filtering with the LM5021MM-2 to avoid nuisance tripping in noisy environments.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM5021MM-2 CAD Models
Texas Instruments LM5021MM-2 PCB symbols & footprints
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