Overvoltage and Overcurrent Protection IC & Li+ Charger Front-End Protection IC Reference Design


Design files


This reference design, using bq24300 and bq24304, is a highly integrated design that provides protection to Li-ion batteries from failures of the charging circuit. The IC continuously monitors the input voltage, the input current, and the battery voltage. The design operates like a linear regulator: for voltages up to the Input Overvoltage threshold, the output is held at 5.5V (bq24300), 5.0V (bq24305) or 4.5V (bq24304). In case of an input overvoltage condition, if the overvoltage condition persists for more than a few microseconds, the IC solution removes power from the charging circuit by turning off an internal switch. In the case of an overcurrent condition, it limits the current to a safe value for a blanking duration before turning the switch off. Additionally, the IC solution also monitors its own die temperature and switches off if it becomes too hot. The reference design also offers optional protection against reverse voltage at the input with an external P-channel MOSFET.

  • # Series Cells: 1S
  • Max Input Volts: 26V
  • Max Charge Current: 200mA
  • Communication: Standalone

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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.

TIDU081.PDF (1089 K)

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

TIDR049.PDF (109 K)

Detailed schematic diagram for design layout and components

TIDR050.PDF (54 K)

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

TIDU082.PDF (115 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ24160I2C 1cell 2.5A Buck battery charger with dual-input, Power Path and USB detection

Data sheet: PDF | HTML
Battery protectors

BQ24300Charger front end protection IC with 30V max Vin and 5.5V LDO output

Data sheet: PDF

Technical documentation

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Type Title Date
Test report TIDA-00034 Test Results Aug. 26, 2013

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