Universal uP Controlled Battery Charger 24Vin 10 Aout max, 5/12V 2A & 5V 4A, 2 USB Ports Ref Design PMP9668 (ACTIVE)

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Key Document

Description

BQ24745 is a host controlled synchronous buck battery charger capable of charging batteries at up to 19.2V and up to 8 A normally, extended to 10 A with use of 8 mOhm battery sense resistor. The power train is capable of 8 A with convection only cooling and 10 A with moderate fan cooling (~200 LFM). The Test Report includes Thermal images for both cases. While the design shows a 28 pin MSP430 as the host, any processor with SMBus capability will work. A 5/12V 2A auxiliary converter using TPS54335, and 5V 4A with TPS40170 with 2x CSD18504 are provided. For the two USB ports, the design provides TPS2561A for power switching and TPS2513A for control. A linear TPS70933 provides the 3.3V for the MSP430 and interface signals. A rich Test Interface allows full testing of hardware in the absence of software and then provides multiple interface choices for software development.

Features
  • Host controlled 10 A charger off 24 Vin
  • MSP430 controller shown, but can work off other processors with SMBus capability
  • Power train can be verified without  processor 
  • 5/12 V 2A and 5V 4A with two USB ports & 3.3V uP power provided
  • All parts on top side for ease of testing / battery discharge switch provided
  • Schematic, BOM, layout and Test Report focusing on Battery charger

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Schematic/Block Diagram

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Design Files

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TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
BQ24745  SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator  Battery management  Not Available Not Available
CSD18504Q5A  40V, N ch NexFET MOSFET™, single SON5x6, 6.6mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
TPS2513A  Dual USB Dedicated Charging Port Controllers  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS2561A  Dual Channel Precision Adjustable Current-Limited Power Switches  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS40170  4.5 V to 60 V Wide-Input Synchronous PWM Buck Controller  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS54335A  4.5V to 28V Input, 3A, Synchronous, Step-Down Converter with Eco-mode  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA 30-V ultra-low-Iq wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
BQ24745 Download -
CSD18504Q5A VSONP (DQJ)| 8 Download Download
TPS2513A Download Download
TPS2561A Download
TPS40170 Download Download
TPS54335A Download Download
Download Download
TPS709 Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1272 27 May 2015
Design files (5)
Title Type Size (KB) Date
ZIP 334 27 May 2015
PDF 3092 27 May 2015
PDF 357 27 May 2015
PDF 132 27 May 2015
PDF 384 27 May 2015

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