{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP5521TM/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP5521TM-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LP5521TM-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LP5521TM%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LP5521TM/NOPB, DC-DC Regulator LED Driver, 3-output switched-capacitor charge pump, I²C dimming, 4.55V output, 25.5mA per channel, 1.25MHz, 20-WFBGA, -30°C to 85°C.","salesMarkdown":"## What this charge pump LED driver is and where it fits The Texas Instruments LP5521TM/NOPB is a 3-output DC-DC regulator built as a switched-capacitor charge pump, purpose-made for driving backlight LEDs. Unlike an inductor-based boost converter, this topology generates a regulated 4.55 V output using only ceramic capacitors — no magnetic component, which saves board height and eliminates inductor whine. Each of the three channels delivers up to 25.5 mA, controlled individually over an I²C bus for dimming. The 1.25 MHz switching frequency keeps external capacitors small, though the 20-WFBGA package (also called 20-TuSMD) means the board needs a reflow oven and X-ray inspection; this is not a hand-solder field-swap part. The -30°C to 85°C ambient range covers indoor consumer gear like LCD monitor backlights, portable device displays, and appliance panels, but it stops short of automotive cabin or outdoor enclosure temperatures. ## I²C dimming — what it means for the firmware and MCU choice Dimming is handled entirely through the I²C interface, not a PWM input pin. That means the host microcontroller needs an I²C peripheral and a few bytes of register-write code to set each channel's brightness independently. No dedicated PWM timer is required, which simplifies the MCU selection, but the firmware must handle the I²C protocol and potentially a register map. The driver does not generate its own PWM waveform on the outputs; the current is set digitally via the bus. For a design already using I²C for other peripherals, this fits cleanly; for a system that only has a spare GPIO, an external I²C bridge or a different driver topology would be needed. ## Switched-capacitor topology — the no-inductor trade-off The charge-pump steps up the input voltage (2.7 V to 5.5 V) to the 4.55 V output using flying capacitors. No inductor means no magnetic field emissions and a simpler PCB layout.","metaTitle":"LP5521TM/NOPB LED Driver, DC-DC Regulator, I²C Dimming","metaDescription":"LP5521TM/NOPB is a 3-channel switched-capacitor charge pump LED driver with I²C dimming, 4.55V output, 25.5mA per channel, 1.25MHz switching, -30°C to 85°C","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"DC DC Regulator","Dimming":"I²C","Package":"Tape & Reel (TR); Cut Tape (CT)","Topology":"Switched Capacitor (Charge Pump)","Frequency":"1.25MHz","Applications":"Backlight","Mounting Type":"Surface Mount","Package / Case":"20-WFBGA","lifecycle_stage":"eol_hot","Voltage - Output":"4.55V","Number of Outputs":"3","Internal Switch(s)":"Yes","Operating Temperature":"-30°C ~ 85°C (TA)","Voltage - Supply (Max)":"5.5V","Voltage - Supply (Min)":"2.7V","Supplier Device Package":"20-TuSMD","Current - Output / Channel":"25.5mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.62","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.62000","currency":"USD"},{"qty":10,"price":"$1.45100","currency":"USD"},{"qty":25,"price":"$1.37720","currency":"USD"},{"qty":100,"price":"$1.13120","currency":"USD"},{"qty":250,"price":"$1.05744","currency":"USD"},{"qty":500,"price":"$0.93450","currency":"USD"},{"qty":1250,"price":"$0.73776","currency":"USD"},{"qty":2500,"price":"$0.69600","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/90b5c231cac52c9ebcf85be771eb74ac.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can LP5521TM/NOPB be used as a replacement for LP5521?","answer":"The TM/NOPB suffix indicates a lead-free (NOPB) finish and a specific tape-and-reel / cut-tape packaging option. Functionally it is the same die as the LP5521 base part, so it should be a drop-in replacement for designs that already use the LP5521 in the same 20-WFBGA footprint. Verify the tape orientation and reel quantity against your pick-and-place setup."},{"question":"What is the closest functional second-source to LP5521TM/NOPB?","answer":"The LM2703MF-ADJ/NOPB is a single-output boost regulator in the same DC-DC regulator class, but it uses an inductive step-up topology, delivers 0.35 A on one channel, and comes in a different package. It is not a pin-compatible or direct replacement for the LP5521TM/NOPB's three-channel charge-pump architecture."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP5521TM-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/LP5521TM-NOPB when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}