{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP38851SX-ADJ/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP38851SX-ADJ-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LP38851SX-ADJ-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LP38851SX-ADJ%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LP38851SX-ADJ/NOPB LDO voltage regulator, adjustable output 0.8V to 1.8V, 800mA, 200mV dropout, DDPAK/TO-263-7 surface mount, -40°C to 125°C.","salesMarkdown":"## 800 mA LDO with 72 dB PSRR down to 120 Hz The LP38851SX-ADJ/NOPB is a single-output positive adjustable LDO regulator from Texas Instruments, delivering 800 mA continuous output current with a maximum dropout voltage of just 0.2 V at full load — the headroom between the input rail and the output must stay above this figure across the load range to maintain regulation. Its PSRR measures 72 dB at 120 Hz and 61 dB at 1 kHz, meaning ripple on the input rail at line frequency and the lower end of switching noise is attenuated by a factor of roughly 4000× to 1000× — relevant for post-regulation of a noisy DC-DC converter feeding sensitive analog circuitry. The adjustable output range spans 0.8 V to 1.8 V, set by an external resistor divider, suiting it for low-voltage core rails in FPGAs, ASICs, or DSPs that require tight tolerance at sub-2 V levels. ## Thermal and protection envelope Built-in protection includes over-current, over-temperature, short-circuit, and under-voltage lockout (UVLO), so the regulator can survive an output short or a brown-out input without external supervisory circuitry. Quiescent current is 300 µA typical, and maximum supply current is 9 mA — the 300 µA Iq floor means the regulator's own draw is low enough for always-on rails in battery-backed systems, though not at the ultra-low-Iq level of a dedicated micropower LDO. ## Control and sourcing posture Enable and soft-start control pins are available — the enable pin allows the output to be gated by a logic signal, and soft start limits inrush current during startup, which is useful when the output capacitor bank is large or the input supply is current-limited.","metaTitle":"LP38851SX-ADJ/NOPB LDO Regulator, 800mA, Adjustable, DDPAK","metaDescription":"Texas Instruments LP38851SX-ADJ/NOPB LDO regulator, 800mA output, adjustable 0.8V-1.8V, 200mV dropout, 72dB PSRR. Active, ROHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"72dB ~ 61dB (120Hz ~ 1kHz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-263-8, D²Pak (7 Leads + Tab), TO-263CA","lifecycle_stage":"eol_hot","Control Features":"Enable, Soft Start","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)":"0.2V @ 800mA","Current - Supply (Max)":"9 mA","Voltage - Output (Max)":"1.8V","Supplier Device Package":"DDPAK/TO-263-7","Current - Quiescent (Iq)":"300 µA","Voltage - Output (Min/Fixed)":"0.8V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.44","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.44000","currency":"USD"},{"qty":10,"price":"$2.19400","currency":"USD"},{"qty":25,"price":"$2.06960","currency":"USD"},{"qty":100,"price":"$1.76330","currency":"USD"},{"qty":250,"price":"$1.65572","currency":"USD"},{"qty":500,"price":"$1.44876","currency":"USD"},{"qty":1000,"price":"$1.20040","currency":"USD"},{"qty":2500,"price":"$1.17150","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/acaf54fdea36456435ab44ed4117b0c4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What package does LP38851SX-ADJ/NOPB come in?","answer":"The supplier device package is DDPAK/TO-263-7 (7 leads plus tab), also described as TO-263-8, D²Pak."},{"question":"What is the PSRR of LP38851SX-ADJ/NOPB?","answer":"The power supply rejection ratio is 72 dB at 120 Hz and 61 dB at 1 kHz, providing strong attenuation of line-frequency ripple and lower-frequency switching noise."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP38851SX-ADJ-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/LP38851SX-ADJ-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}}