--- title: How A Belkin USB Charger Pulls Off A 3 Milliwatt Standby... description: The Belkin BoostCharger Pro claims 'zero standby power', which in practice means about 3 milliwatts at 0.3 mA. A teardown reveals the charger uses a Renesas... canonical: https://daily.dev/posts/how-a-belkin-usb-charger-pulls-off-a-3-milliwatt-standby-usage-vdxu1e0ol twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How A Belkin USB Charger Pulls Off A 3 Milliwatt Standby Usage | daily.dev og:description: The Belkin BoostCharger Pro claims 'zero standby power', which in practice means about 3 milliwatts at 0.3 mA. A teardown reveals the charger uses a Renesas... og:url: https://daily.dev/posts/how-a-belkin-usb-charger-pulls-off-a-3-milliwatt-standby-usage-vdxu1e0ol og:image: https://api.daily.dev/og/posts/vdXu1e0OL.png og:image:alt: How A Belkin USB Charger Pulls Off A 3 Milliwatt Standby Usage og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How A Belkin USB Charger Pulls Off A 3 Milliwatt Standby Usage **[Hackaday](https://daily.dev/sources/hackaday)** · 3 min read · 0 upvotes · 0 comments ## Summary The Belkin BoostCharger Pro claims 'zero standby power', which in practice means about 3 milliwatts at 0.3 mA. A teardown reveals the charger uses a Renesas iW9870 flyback controller IC following a Renesas application note for zero standby USB-C adapters. The USB-PD controller detects cable presence and signals the flyback section to mostly shut down when idle. However, inserting an e-marked USB-C cable (with no device attached) spikes standby draw to ~30 mW, disabling the feature. Some users report the charger randomly cutting output during active charging, a side effect of the cable-detection logic. The author suggests a physical on/off switch as a simpler, more reliable alternative. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Your charger's specs matter way more than you think, and here's what actually protects your devices](https://daily.dev/posts/your-charger-s-specs-matter-way-more-than-you-think-and-here-s-what-actually-protects-your-devices-zghcls9e1) · XDA Developers · 0 upvotes · 0 comments --- Tags: [#reverse-engineering](https://daily.dev/tags/reverse-engineering) [View this post on daily.dev](https://daily.dev/posts/how-a-belkin-usb-charger-pulls-off-a-3-milliwatt-standby-usage-vdxu1e0ol) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"How A Belkin USB Charger Pulls Off A 3 Milliwatt Standby Usage","url":"https://daily.dev/posts/how-a-belkin-usb-charger-pulls-off-a-3-milliwatt-standby-usage-vdxu1e0ol","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-a-belkin-usb-charger-pulls-off-a-3-milliwatt-standby-usage-vdxu1e0ol"},"datePublished":"2026-03-22T08:20:42.710Z","dateModified":"2026-03-22T08:21:14.055Z","description":"The Belkin BoostCharger Pro claims 'zero standby power', which in practice means about 3 milliwatts at 0.3 mA. 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