{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM5021MM-2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM5021MM-2","canonicalUrl":"https://icboms.com/texas-instruments/LM5021MM-2","factsUrl":"https://icboms.com/api/mcp/products/LM5021MM-2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM5021MM-2 offline switching controller, Flyback/Forward topology, 50% duty cycle, 1 MHz switching, 8-VSSOP package, Bulk.","salesMarkdown":"## Controller architecture and switching limits The LM5021MM-2 is a current-mode PWM controller supporting both flyback and forward topologies — the two dominant isolated offline converter architectures for auxiliary and bias supplies up to roughly 100 W. Maximum duty cycle is clamped at 50%, which limits transformer flux imbalance in current-mode flyback designs and avoids saturation during startup transients. Switching frequency reaches up to 1 MHz, enabling small magnetics and ceramic output capacitors, though above 500 kHz the layout parasitics (gate-drive loop inductance, transformer interwinding capacitance) become the limiting factor for EMI and efficiency. No internal power switch — the controller drives an external MOSFET via the OUT pin, giving the designer freedom to select the Rds(on) and Qg that match the power stage, but adding a gate-drive resistor and a snubber network to the BOM. ## Supply range, startup, and protection Vcc operates from 8 V to 30 V, wide enough for universal-input offline supplies where the bias winding delivers 12–18 V after startup, with margin for load transients. Startup threshold is 20 V — the controller remains off until the startup resistor charges the Vcc capacitor past this level, then the UVLO hysteresis keeps it running down to about 8 V. On-chip fault protection includes cycle-by-cycle current limiting and overload detection, which together prevent the transformer from saturating and limit output power during a short circuit. Control features — frequency control (for spread-spectrum EMI reduction), soft-start (for controlled output rise), and synchronization input (for multi-phase or interleaved converters) — are available on dedicated pins, though the 8-pin package limits how many can be used simultaneously. ## Package, thermal, and board-fit Supplied in Bulk packaging — loose units in an anti-static tube or bag, typical for prototype quantities and low-volume production. For reel packaging, check the alternate ordering code (LM5021MM-2/NOPB for RoHS-compliant versions on tape-and-reel). ## Lifecycle and compliance reality New designs can proceed without an obsolescence timeline. RoHS status is non-compliant. It may still be used under the RoHS exemption for lead in high-melting-temperature solders (exemption 7(c)-I) or in military/aerospace applications, but EU-compliant designs should verify the exemption applicability or migrate to the LM5021MM-2/NOPB variant. For buyers with a BOM line specifying LM5021MM-2, the active lifecycle means no urgency to qualify an alternative. If a RoHS-compliant substitute is required, the LM5021MM-2/NOPB (lead-free, tape-and-reel) is the direct TI counterpart.","metaTitle":"LM5021MM-2 TI Offline Flyback Controller, 1MHz, 8-VSSOP","metaDescription":"Texas Instruments LM5021MM-2 offline switching controller. Flyback/Forward topology, 1MHz switching, 8V-30V supply, -40°C to 125°C. Active, RoHS non-compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Topology":"Flyback, Forward","Duty Cycle":"50%","Mounting Type":"Surface Mount","Package / Case":"8-TSSOP, 8-MSOP (0.118\\\", 3.00mm Width)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control, Soft Start, Sync","Fault Protection":"Current Limiting, Over Load","Output Isolation":"Isolated","Internal Switch(s)":"No","Voltage - Start Up":"20 V","Frequency - Switching":"Up to 1MHz","Operating Temperature":"-40°C ~ 125°C (TJ)","Supplier Device Package":"8-VSSOP","Voltage - Supply (Vcc/Vdd)":"8V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.68","stockQuantity":0,"priceTiers":[{"qty":444,"price":"$0.68000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2a425e149b0b3582159cbd1556419a8c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What compliance documentation does Texas Instruments provide for LM5021MM-2?","answer":"The LM5021MM-2 is RoHS non-compliant (contains lead). TI provides a datasheet, application notes, and a PCN (product change notification) history. For RoHS-compliant designs, order the LM5021MM-2/NOPB variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM5021MM-2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM5021MM-2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}