{"product_id":"up1542s-up1542ssu8-sop8-synchronous-rectified-buck-controller","title":"UP1542S UP1542SSU8 SOP-8 Synchronous Rectified Buck Controller","description":"\u003ch2\u003eUP1542S Synchronous Rectified Buck Controller – Hashboard PCB Replacement IC\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eUP1542S (UP1542SSU8)\u003c\/strong\u003e is a \u003cstrong\u003esynchronous rectified buck controller\u003c\/strong\u003e in an \u003cstrong\u003eSOP-8\u003c\/strong\u003e package, designed to step down \u003cstrong\u003e5 V or 12 V\u003c\/strong\u003e input rails to outputs as low as \u003cstrong\u003e0.6 V\u003c\/strong\u003e. On ASIC miner hash boards it drives the local step-down converter that feeds power to groups of hashing chips. When this controller fails, its downstream ASIC string loses its supply rail and drops out of the hash chain — often appearing as a block of consecutive dead chips on a test-fixture scan rather than a single failed ASIC.\u003c\/p\u003e\n\u003ch3\u003eDistinguishing a Controller Fault from a Chip Fault\u003c\/h3\u003e\n\u003cp\u003eIf a test fixture reports a contiguous group of failed chip positions (e.g. positions 12–18 all dead while 11 and 19 are fine), the fault is almost certainly in the power stage rather than in seven individual ASICs. Measure the output voltage at the inductor pad of the suspect buck converter: if the rail is absent or far below spec, the UP1542S controller is the primary suspect. A secondary check is to measure the switching waveform at the SW pin — a flat line confirms the controller is not switching.\u003c\/p\u003e\n\u003ch3\u003eReplacement Procedure\u003c\/h3\u003e\n\u003cp\u003eRemove the failed UP1542S with a soldering iron or hot-air station at 300–330 °C, taking care not to disturb the surrounding inductor and capacitors. Clean the eight pads, apply flux, and place the new IC observing pin-1 orientation. Solder by dragging a fine iron tip across the leads, then inspect under magnification for bridges — the 1.27 mm SOP-8 pitch is relatively forgiving. After replacement, power the board and verify the output voltage matches the original design value (typically 0.6–1.0 V depending on the ASIC family) before reinstalling in the miner.\u003c\/p\u003e\n\u003ch4\u003eUP1542S Buck Controller Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003ePart Number\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eUP1542S (UP1542SSU8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eSynchronous rectified buck controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003ePackage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eSOP-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eInput Voltage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e5 V \/ 12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eMinimum Output Voltage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e0.6 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eControl Scheme\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eConstant frequency, voltage mode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eSurface mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e−45 °C to +125 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eRelated Buck Controllers \u0026amp; Power ICs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/up1529q-up9305w-up1542s-up1529qsu8-power-chip-antminer-hashboard-repair-ic-l3-s9\"\u003eUP1529Q \/ UP9305W Power Chip – Antminer L3+ \/ S9\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lm27402s-lm27402sq-switching-controller-synchronous-buck-antminer\"\u003eLM27402S Sync Buck Controller – Antminer\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/tps40322rhbr-dual-output-synchronous-buck-controller-innosilicon-a10-hashboard-repair\"\u003eTPS40322 Dual Buck Controller – Innosilicon A10\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kb6880-pwm-buck-controller-innosilicon-cryptominer-a4-a6-hashboard-repair\"\u003eKB6880 PWM Buck Controller – Innosilicon A4\/A6\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRepairing hash board power stages in volume? \u003ca href=\"mailto:contact@lys-sz.com\"\u003eContact us at contact@lys-sz.com\u003c\/a\u003e for buck controller IC kits and volume pricing.\u003c\/p\u003e\n\u003cp\u003eWorldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":41724673589427,"sku":null,"price":1.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/UP1542S-UP1542SSU8-SOP8-Synchronous-Rectified-Buck-Controller-replacement-IC-Hash-board-PCB.webp?v=1746857030","url":"https:\/\/lys-sz.com\/products\/up1542s-up1542ssu8-sop8-synchronous-rectified-buck-controller","provider":"LYS Shenzhen","version":"1.0","type":"link"}