Solar MPPT Charge Controller Reference Design
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Key Document


This design is a 20A Maximum Power Point Tracking (MPPT) solar charge controller created for solar panel inputs corresponding to 12V and 24V panels. The design is targeted for small and medium power solar charger solutions and is capable of operating with 12V/24V panels and 12V/24V batteries up to 20A output current. Designed with scalability in mind, it can easily be adapted to a 48V system by changing the MOSFETs to 100V rated parts. The user can also increase the current to 40A by using the TO-220 package version of same MOSFETs used currently. The Solar MPPT Charge Controller was created with real world considerations, including reverse battery protection and software programmable alarms and indications provided in hardware but were left non-configured. The design has an operating efficiency of above 97% at full load in a 24V system. For 12V systems the efficiency is above 96% and includes losses in the reverse battery protection MOSFETs.

  • More than 96% efficiency at full load in 12V and 24V systems
  • Supports Wide Input Voltage Range: 15VDC - 44VDC
  • Flexible design supports both 12V or 24V solar panels
  • Output Current: 20A max
  • Small Board Form Factor: 130 mm x 84 mm x 22 mm

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Schematic/Block Diagram

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Test Data

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TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18502Q5B  40V, N ch NexFET MOSFETâ„¢, single SON5x6, 2.3mOhm  MOSFETs  Sample & Buy Not Available
CSD18532Q5B  60V, N ch NexFET MOSFETâ„¢, single SON5x6, 3.2mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
INA271  -16 to 80V, split-stage current sense amplifier w/ in-line filter capability  Current sense amplifiers  Sample & Buy Not Available
LM5019  7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
MSP430F5132  25 MHz MCU with 8KB FLASH, 1KB SRAM, 10-bit ADC, Comparator, DMA, 16-bit High Resolution Timer  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
SM72295  3-A, 100-V full bridge gate driver with Integrated current sense amplifier  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules
TLV704  150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18502Q5B VSON-CLIP (DNK)| 8 Download
CSD18532Q5B VSON-CLIP (DNK)| 8 Download Download
INA271 Download Download
LM5019 Download Download
Download Download
MSP430F5132 Download -
Download -
Download Download
SM72295 Download Download
TLV704 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1350 29 Jan 2014
Design files (3)
Title Type Size (KB) Date
ZIP 1112 14 Aug 2018
ZIP 28 29 Jan 2014
PDF 54 29 Jan 2014
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Software development (1)

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