Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Mon, 20 Apr 2020 02:58:34 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 03K9kaKn027881; Mon, 20 Apr 2020 05:46:56 -0400 Received: from outgoing-exchange-5.mit.edu (OUTGOING-EXCHANGE-5.MIT.EDU [18.9.28.59]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 03K9kZD6027878 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 20 Apr 2020 05:46:36 -0400 Received: from oc11exedge2.exchange.mit.edu (OC11EXEDGE2.EXCHANGE.MIT.EDU [18.9.3.18]) by outgoing-exchange-5.mit.edu (8.14.7/8.12.4) with ESMTP id 03K9kVVS015204 for ; Mon, 20 Apr 2020 05:46:41 -0400 Received: from oc11expo25.exchange.mit.edu (18.9.4.96) by oc11exedge2.exchange.mit.edu (18.9.3.18) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Mon, 20 Apr 2020 05:45:54 -0400 Received: from oc11exhyb8.exchange.mit.edu (18.9.1.113) by oc11expo25.exchange.mit.edu (18.9.4.96) with Microsoft SMTP Server (TLS) id 15.0.1365.1; Mon, 20 Apr 2020 05:46:32 -0400 Received: from NAM02-BL2-obe.outbound.protection.outlook.com (104.47.38.57) by oc11exhyb8.exchange.mit.edu (18.9.1.113) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Mon, 20 Apr 2020 05:46:32 -0400 Received: from CO2PR07CA0057.namprd07.prod.outlook.com (2603:10b6:100::25) by SN6PR01MB5198.prod.exchangelabs.com (2603:10b6:805:bd::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2921.29; Mon, 20 Apr 2020 09:46:31 +0000 Received: from CO1NAM03FT022.eop-NAM03.prod.protection.outlook.com (2603:10b6:100:0:cafe::c0) by CO2PR07CA0057.outlook.office365.com (2603:10b6:100::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2921.26 via Frontend Transport; Mon, 20 Apr 2020 09:46:31 +0000 Received: from mail-ed1-f45.google.com (209.85.208.45) by CO1NAM03FT022.mail.protection.outlook.com (10.152.80.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2921.25 via Frontend Transport; Mon, 20 Apr 2020 09:46:30 +0000 Received: by mail-ed1-f45.google.com with SMTP id l3so3891444edq.13 for ; Mon, 20 Apr 2020 02:46:30 -0700 (PDT) From: RussellMc To: Microcontroller discussion list - Public. Sender: "piclist-bounces@mit.edu" Date: Mon, 20 Apr 2020 02:44:42 -0700 Subject: Re: [EE] LDO reg keeps failing. Looking for suggestions. Thread-Topic: [EE] LDO reg keeps failing. Looking for suggestions. Thread-Index: AdYW+kHMRqkASsyFQG6xZhcYc8hasA== Message-ID: References: <20200420073653.GL12237@laptop.org> List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: Pass (protection.outlook.com: domain of gmail.com designates 209.85.208.45 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.208.45; helo=mail-ed1-f45.google.com; dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=2kNGecELaKt2nCk0rlQeQ1oRxFq9st7e6p3sFuDJ0GM=; b=sUp5GSR1jQyoNlCfwazhSNpx7LnQgpudUcP6CD1gsNLOx7dOt24rjBjVjMxGBmMIuI 8oforWkxCQsxkMQ0wWhtqJbj6xOJp2bOy7e02PuRMDJ9DTFZ9DeoJWdkbnyiA25wWuLQ Nq3YWbPfOH2agIQJcLs/bezUQKepIM78sl1qQU26uScKBzoSJsLUSiwqig6I6VnLVm/b 576pOQ/S6RiMjLW1upX+NR3ZKyK334NMVm4a0AHisX7OV3mVMgJ50Do8X8IPwlvnQGs5 EIb/3K/G3R2RxXZo+mp0QPLXfsUKWswy6iHXCz1cYhOI4bwupkEtI87HsCijZqBE4tfr 3Ojw== authentication-results: spf=pass (sender IP is 209.85.208.45) smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified) header.d=gmail.com;mit.edu; dmarc=pass action=none header.from=gmail.com;compauth=pass reason=100 errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-received: by 2002:a05:6402:1597:: with SMTP id c23mr8229673edv.353.1587375988750; Mon, 20 Apr 2020 02:46:28 -0700 (PDT) x-topics: [EE] x-content-filtered-by: Mailman/MimeDel 2.1.6 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 On phone. Can't display diagram. Is there a reverse biased diode across regulator from input to output > Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .