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CC: Russell McMahon Sender: "piclist-bounces@mit.edu" Date: Fri, 4 Sep 2020 01:52:51 -0700 Subject: Re: [OT] Simple LiPo charging circuit Thread-Topic: [OT] Simple LiPo charging circuit Thread-Index: AdaCmi+s7416vLUSR8uETkJQVPWkVA== Message-ID: References: <6091de9f-23e5-b862-5cde-28e7450429d0@gmail.com> <20200904030306.GA30954@laptop.org> <7d0c7aa5-e974-9e82-015e-2e3501768c5d@gmail.com> <20200904060223.GC30954@laptop.org> <6e6855d8-1672-c321-c397-0459849c1da3@gmail.com> 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 209.85.208.48 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.208.48; helo=mail-ed1-f48.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 :cc; bh=xUbhESDR/wFTs69o5+uGT1BQTGC9iObvheMstkpw6yw=; b=dfxeB4KRqMJMbw46RWmC/wJL6VKG/q6r9FXTiybhvf/BEGZsL+e5eOpNgFT1sxaFQj mHiajjVkPYbLUX60rVCYzwEAqasoBLV+fFK8G/dkCj3cKbDYnwyD6rH7RlWpfA4k+DI5 el5ib3gQezCWywEud6LkUBNy/GvxqWCaVr3b79qP3JyB1NQlC2eqcCI+86LE8BFf5HZG WykvG7GlFxE8qBYsSJXfHFVTluTL3RRaxeYeXVolLwJQhwxa7e6v3QrBytTM0QL1Swfg UQckvy6Gw9qCXi2Y7TTzZt9xzeLgF0e00IQYUjxhmP/p15ewLpqZ6vSnlKqmNrt2O+Mu xKhw== authentication-results: spf=pass (sender IP is 209.85.208.48) 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; 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:a50:fa94:: with SMTP id w20mr7168846edr.206.1599209584350; Fri, 04 Sep 2020 01:53:04 -0700 (PDT) x-topics: [OT] 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 You can combine the boost converter version to allow higher Vin plus the battery low voltage protection circuit from the lower vin board. These can be connected with 2 wires and a few tracks cut on the 4056 board. Circuits of the 4056 PCBs are available. The DW01 drives a low side back to back FET pair in a single pkg. Easier to do than describe :-). You could make a low voltage cutoff yourself but it would cost more than a 4056. Russell On Fri, 4 Sep 2020, 19:48 Clint Jay, wrote: > Agree on theTP4056 boards, excellent value for money, I buy the TP4056/DW= 01 > charge/battery protection boards in packs of ten these days as they're > really handy for throwing together a quick Li-Ion battery pack for portab= le > gear. > > An example: > > https://www.ebay.co.uk/itm/5PCS-5V-Micro-USB-Lithium-Battery-Charging-Boa= rd-Charger-Module-1A-18650 > > I've also found a variant which doesn't have the DW01 battery protection = IC > but does have the TP4056 and a boost converter which can provide outputs = up > to a claimed 12V/2A (I'm pretty sure it won't give 2A at 12V but it still > looks very useful) > > https://www.ebay.co.uk/itm/USB-18650-Lithium-Li-ion-Battery-Charger-Modul= e-Boost-3-7V-to-5V-9V-12V-New/ > > > --=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 .