High efficiency sync switch mode charger controller solar lithium battery charger reference design


Design files


This reference design is featured in solar lithium battery applications. This design, which contains an integrated switch-mode battery charge controller, provides input voltage regulation, which reduces charge current when input voltage falls below a programmed level. When the input is powered by a solar panel, the input regulation loop maintains the panel at maximum power output. This solution is also called the HPA639 A. The manual includes the  bill of materials, board layout, and schematic. The user's guide describes the features and operation of the solution.

  • # Series Cells: 1 to 6S
  • Max Input Volts: 28V
  • Max Charge Current: 8A
  • Topology: Switch mode
  • Communication: Standalone
  • Features:  Programmable Maximum Power Point Tracking (MPPT) for Solar Panel;
  • Adjustable charge voltage

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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU109.PDF (598 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR080.PDF (83 K)

Detailed schematic diagram for design layout and components

TIDR081.PDF (33 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDU110.PDF (394 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ24650Standalone 1-6 cell Buck battery charge controller with solar input and integrated MPPT

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report TIDA-00049 Test Results Aug. 27, 2013

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