DIY USB Chargers

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Want to make your own USB charger for smartphone, tablets and laptops?

Today, USB (Universal Serial Bus) charges just about any electronic device. From smartphones, tablets and notebooks to fitness bands and other portable battery-powered devices, USB charges it all. Devices can charge from USB ports in wall sockets, airports, laptop, cars, etc. Notably, the USB specification has changed as legacy USB interfaces cannot keep up with the trend towards smaller, thinner, and lighter designs. The era of USB Type-C and USB Power Delivery (PD) is here to offer more power and greater flexibility than conventional USB charging.

And that said, designers of USB power supplies need components that can achieve a balance in producing a compact, cost-effective design to meet the size and cost barriers faced in portable consumer devices. At the same time, they should be able to meet the necessary safety and energy-efficiency standards.

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Here are several reference designs to help you get started with USB charger development. They are provided with a complete schematic, BOM, layout, and more. Check them out!

1. Low-cost Mini USB Charger For Smartphones/Tablets

Here is a compact and cost-effective design form factored for stuffing inside a little white cube occupying a space of 1″ by 1″ by 1″. It plugs into a standard AC receptacle and charges smartphones, tablets, handhelds. The design features TI’s TPS2511, a USB Switch and charging port controller in a single package. It also includes the UCC28700 Fly Power Controller to reduce standby power to less than 30 mW. That means a five-star energy rating!

The TPS2511‘s USB switch ensures compliance with USB current limit and safety standards. The charging port contains all necessary control signals for BC1.2 standard compliance as well as the handshaking protocols for all popular smartphones and handheld devices.

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Click here for the reference design.

2. 5V/2.1A Smart USB Car Charger

DC/DC chargers in cars are becoming quite popular. This reference design is a complete automotive USB charger solution from the car battery. This compact design is form factored to fit inside a cigarette lighter socket and provide a single USB charging port. From a 9V to 40V DC input, this design generates a 5V/2.1A output for smartphones and tablets. The TPS2511 USB power switch offers adaptive electrical signature to recognize and charge many devices.

Click here for reference design

3. 18 W USB PD Rapid-charger

Do you want to make a USB power adapter tailored to the next generation of electronic devices? This reference design describes how to make an 18-Watt, Type-C and USB-PD compliant ac-dc power converter ideal for chargers for smart mobile devices. It is claimed to be fast, compact and highly energy-efficient and offers 5 V/3 A or 9 V/2 A output. The design uses the InnoSwitch-CP and Weltrend WT6630P USB TypeC USB-PD controller. The WT6630P is a highly integrated USB PD controller that minimizes external components by integrating many components to allow small form factor and low BOM cost. The design contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.

Click here for the reference design.

4. Fast 60W USB Car Charger

The CCG2 60W Car Charger Reference design describes how to make a receptacle based USB-C Charger with USB PD 2.0 support. Charger dimensions are 49.00mm(L) x 45.00mm(W) x 11.92(H). It is designed to work with standard Car Lighter Attachment (CLA). In the PD mode, it supports [email protected], [email protected], [email protected], [email protected], [email protected], [email protected] and [email protected] output. The board can be programmed to support any output voltage between 0 to 20V with 100mV resolution. It works with any DC input between 4V to 24V. Applications include fast and efficient charging experiences for cell phone (Galaxy Note 8 / s8 / s8 plus, iPhone/iPad), new MacBook 12-inch / MacBook Pro, and other USB-C laptop/notebook.

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Click here for more information.

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