{"product_id":"ltc3807eudc-buck-regulator","title":"LTC3807EUDC LGSG Buck Regulator Positive Output Step-Down DC-DC Controller","description":"\u003ch2\u003eLTC3807EUDC LGSG Buck Regulator | Low-IQ Synchronous Step-Down Controller for Antminer L3+ Hashboard Repair\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eLTC3807EUDC\u003c\/strong\u003e (marking \u003cstrong\u003e714 LGSG\u003c\/strong\u003e) is a \u003cstrong\u003elow-IQ synchronous step-down DC-DC controller\u003c\/strong\u003e in a \u003cstrong\u003e20-WFQFN exposed-pad package\u003c\/strong\u003e, used on the \u003cstrong\u003eAntminer L3+ hashboard\u003c\/strong\u003e to drive an external MOSFET pair into a buck topology. Wide \u003cstrong\u003e4V to 38V input supply range\u003c\/strong\u003e + \u003cstrong\u003e0.8V precision reference\u003c\/strong\u003e + \u003cstrong\u003eup to 99% duty cycle\u003c\/strong\u003e covers the full range of hashboard voltage conversion requirements from a single controller IC.\u003c\/p\u003e\n\u003cp\u003eKey features for hashboard control duty: \u003cstrong\u003e50kHz to 900kHz programmable switching frequency\u003c\/strong\u003e, \u003cstrong\u003eTRACK\/SS pin for output voltage ramping\u003c\/strong\u003e, \u003cstrong\u003epower-good output\u003c\/strong\u003e for system status monitoring, \u003cstrong\u003etracking input\u003c\/strong\u003e for multi-rail sequencing, \u003cstrong\u003ecurrent limit + soft start + frequency control + enable\u003c\/strong\u003e. The controller drives external MOSFETs (not integrated) — sized to whatever output current the hashboard rail needs, up to the FET's capability.\u003c\/p\u003e\n\u003ch3\u003eWhen to Replace the LTC3807EUDC\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAntminer L3+ hashboard rail dead\u003c\/strong\u003e — controller not driving the external MOSFET pair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHashboard boots but rail drops under load\u003c\/strong\u003e — controller entering current-limit or losing regulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower-good output stuck low\u003c\/strong\u003e on the controller — internal fault or output out of spec.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible damage on the 20-WFQFN package\u003c\/strong\u003e after a downstream MOSFET failure or transient event.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjacent external MOSFETs also failed\u003c\/strong\u003e — replace MOSFETs + controller together to avoid repeat failure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eLTC3807EUDC LGSG Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eLTC3807EUDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMarking\u003c\/td\u003e\n\u003ctd\u003e714 LGSG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Product\u003c\/td\u003e\n\u003ctd\u003eLTC3807\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eSynchronous step-down (buck) DC-DC controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eTransistor driver (external MOSFETs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Configuration\u003c\/td\u003e\n\u003ctd\u003ePositive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Phases\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e4V to 38V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference Voltage\u003c\/td\u003e\n\u003ctd\u003e0.8V (precision)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching Frequency\u003c\/td\u003e\n\u003ctd\u003e50 kHz to 900 kHz (programmable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDuty Cycle (Max)\u003c\/td\u003e\n\u003ctd\u003e99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSynchronous Rectifier\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Features\u003c\/td\u003e\n\u003ctd\u003eCurrent limit, enable, frequency control, soft start, tracking, power-good output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to +125°C (TJ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003e20-WFQFN exposed pad\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Board\u003c\/td\u003e\n\u003ctd\u003eAntminer L3+ hashboard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eBrand New\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eFAQ — LTC3807EUDC Buck Controller\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Controller vs converter — what's the difference?\u003c\/strong\u003e\u003cbr\u003eA: A converter has integrated MOSFETs (small current capability, drop-in simplicity). A controller drives external MOSFETs (higher current capability, more BOM complexity). The LTC3807EUDC is a controller — when it dies, also inspect the external MOSFET pair it was driving. They often go together.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm the controller is the failed part?\u003c\/strong\u003e\u003cbr\u003eA: Scope the high-side and low-side gate-drive outputs. Healthy controller produces clean PWM at the programmed frequency (50–900kHz range). Dead controller produces no drive, asymmetric drive, or shoot-through. Also check the power-good output — should be high once VOUT is in regulation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: 20-WFQFN rework profile?\u003c\/strong\u003e\u003cbr\u003eA: WFQFN with exposed pad — bottom-side preheat 130–150°C, top-side hot air 320°C with flux paste. The exposed pad carries thermal load and must reflow to the board's copper. After reflow, verify all 20 pins via continuity test + scope-probe the gate-drive outputs under low-power conditions before re-energising the full hashboard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Bulk pricing for L3+ repair benches?\u003c\/strong\u003e\u003cbr\u003eA: Yes — email contact@lys-sz.com for tube-quantity LTC3807EUDC pricing and matched external-MOSFET kits.\u003c\/p\u003e\n\u003ch3\u003eRelated products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/tps61161drvr-bzr-led-driver-antminer-hashboard\"\u003eTPS61161DRVR BZR LED Driver \/ Boost (Antminer L3+)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/l3-s9-boost-module-14v-for-hashboard-l3-s9-6r8-rt8537-green-version-voltage-regulator\"\u003eL3+ \/ S9 Boost Module 14V (6R8 RT8537)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/antminer-l3-u73-step-down-power-module-dc-board-voltage-regulator-black-version\"\u003eAntminer L3+ U73 Step-Down Power Module\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/spx5205m5-linear-voltage-regulator-ic-antminer-s9-l3-repair\"\u003eSPX5205M5 Linear Voltage Regulator (Antminer S9 \/ L3)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAntminer L3+ repair benches stocking LTC3807EUDC buck controllers by the tube? Email \u003ca href=\"mailto:contact@lys-sz.com\"\u003econtact@lys-sz.com\u003c\/a\u003e for bulk pricing. Worldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":41725026795699,"sku":null,"price":11.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/LTC3807EUDC-3807EUDC-LGSG-Buck-Regulator-Positive-Output-Step-Down-Controller.webp?v=1774192243","url":"https:\/\/lys-sz.com\/products\/ltc3807eudc-buck-regulator","provider":"LYS Shenzhen","version":"1.0","type":"link"}