{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP3891ES-1.5/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP3891ES-1.5-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LP3891ES-1.5-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LP3891ES-1.5%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LP3891ES-1.5/NOPB linear voltage regulator, fixed 1.5V output, 800mA, DDPAK/TO-263-5 surface-mount package, 80dB PSRR, active production.","salesMarkdown":"## 800mA fixed 1.5V LDO — dropout and PSRR for post-regulator rails The LP3891ES-1.5/NOPB is a single-output positive LDO from Texas Instruments, delivering a fixed 1.5V at up to 800mA. Quiescent current is 30 µA typical, and the maximum supply current is 8 mA — the regulator's own draw stays low even when the load is light, which matters for always-on rails in battery-powered gear. ## 80dB PSRR — what it buys on a switching pre-regulator Power-supply rejection ratio is 80 dB at 120 Hz, rolling off to 65 dB at 1 kHz. This means ripple from a 100/120 Hz rectified front-end or a 300 kHz–1 MHz switcher is attenuated by a factor of roughly 10,000 at line frequency and ~1,800 at 1 kHz. For a 50 mVpp ripple on the input, the output sees under 5 µV at 120 Hz — clean enough to feed a sensitive analog front-end or a PLL supply. The 1.5V fixed output and 5.5V maximum input give a 4V headroom window. The enable pin lets a system controller sequence the rail on and off, and the built-in protection — over-current, over-temperature, short-circuit, and UVLO — covers the common fault cases without external supervisory circuitry. ## DDPAK/TO-263-5 — hand-solderable power package The part comes in a DDPAK/TO-263-5 (5-lead plus tab) surface-mount package. The tab is electrically connected to ground (the output is positive), so no isolation mask is needed. The tube packaging is standard for prototyping and small-batch production; for reels, check the alternate order code.","metaTitle":"LP3891ES-1.5/NOPB LDO Regulator, 800mA, 1.5V Fixed, DDPAK","metaDescription":"Texas Instruments LP3891ES-1.5/NOPB linear regulator, 800mA output, 1.5V fixed, 0.4V dropout, 80dB PSRR, active production, ROHS3. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"80dB ~ 65dB (120Hz ~ 1kHz)","Package":"Tube","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-6, D²Pak (5 Leads + Tab), TO-263BA","lifecycle_stage":"eol_hot","Control Features":"Enable","Current - Output":"800mA","Protection Features":"Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"5.5V","Voltage Dropout (Max)":"0.4V @ 800mA","Current - Supply (Max)":"8 mA","Supplier Device Package":"DDPAK/TO-263-5","Current - Quiescent (Iq)":"30 µA","Voltage - Output (Min/Fixed)":"1.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.63","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$4.63000","currency":"USD"},{"qty":10,"price":"$4.16300","currency":"USD"},{"qty":25,"price":"$3.93520","currency":"USD"},{"qty":100,"price":"$3.41060","currency":"USD"},{"qty":250,"price":"$3.23564","currency":"USD"},{"qty":500,"price":"$2.90334","currency":"USD"},{"qty":1000,"price":"$2.47500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/f49e8529952262208fc8ee3b9411ec35.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy LP3891ES-1.5/NOPB and get a price?","answer":"The LP3891ES-1.5/NOPB is available to order through independent distribution."},{"question":"What does the 80dB PSRR mean for my circuit?","answer":"A 50 mVpp ripple on the input becomes under 5 µV on the output — clean enough for sensitive analog or PLL rails."},{"question":"What package does LP3891ES-1.5/NOPB come in?","answer":"It ships in a DDPAK/TO-263-5 surface-mount package (5 leads plus exposed thermal tab). The tab is ground and should be soldered to a copper pour for heat sinking."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP3891ES-1.5-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LP3891ES-1.5-NOPB 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}}