Product details

Function Charger Front-End Protection Number of series cells (Min) 1 Number of series cells (Max) 1 Features Overcurrent protection Typical operating current (Typ) (uA) 340 Rating Catalog Vin (Max) (V) 30
Function Charger Front-End Protection Number of series cells (Min) 1 Number of series cells (Max) 1 Features Overcurrent protection Typical operating current (Typ) (uA) 340 Rating Catalog Vin (Max) (V) 30
WSON (DSG) 8 4 mm² 2 x 2
  • Provides Protection for Three Variables:
    • Input Overvoltage
    • Input Overcurrent with Current Limiting
    • Battery Overvoltage
  • 30V Maximum Input Voltage
  • Optional Input Reverse Polarity Protection
  • High Immunity Against False Triggering Due to Voltage Spikes
  • Robust Against False Triggering Due to Current Transients
  • Thermal Shutdown
  • Enable Function
  • Small 2 mm × 2 mm 8-Pin SON Package
  • LDO Mode Voltage Regulation Options:
    • 5.5V on bq24300
    • 4.5V on bq24304
    • 5.0V on bq24305
  • APPLICATIONS
    • Bluetooth Headsets
    • Low-Power Handheld Devices
  • Provides Protection for Three Variables:
    • Input Overvoltage
    • Input Overcurrent with Current Limiting
    • Battery Overvoltage
  • 30V Maximum Input Voltage
  • Optional Input Reverse Polarity Protection
  • High Immunity Against False Triggering Due to Voltage Spikes
  • Robust Against False Triggering Due to Current Transients
  • Thermal Shutdown
  • Enable Function
  • Small 2 mm × 2 mm 8-Pin SON Package
  • LDO Mode Voltage Regulation Options:
    • 5.5V on bq24300
    • 4.5V on bq24304
    • 5.0V on bq24305
  • APPLICATIONS
    • Bluetooth Headsets
    • Low-Power Handheld Devices

The bq24300 and bq24304 are highly integrated circuits designed to provide 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 device 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 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 also monitors its own die temperature and switches off if it becomes too hot.

The IC also offers optional protection against reverse voltage at the input with an external P-channel MOSFET.

The bq24300 and bq24304 are highly integrated circuits designed to provide 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 device 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 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 also monitors its own die temperature and switches off if it becomes too hot.

The IC also offers optional protection against reverse voltage at the input with an external P-channel MOSFET.

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Technical documentation

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Type Title Date
* Data sheet Overvoltage and Overcurrent Protection IC & Li+ Charger Front-End Protection IC datasheet (Rev. C) 04 Dec 2009
User guide bq2430x/1x DSG EVM (HPA245) for Li+ Charger Front End Protection IC (Rev. B) 04 Nov 2016
Analog design journal Battery-charger front-end IC improves charging-system safety 16 May 2008
Application note How to Meet 24V Hot Plug-In Test for Charge Front-End bq243xx 02 Jan 2008
Application note High Voltage Pulse Transient Safety Design fro bq243xx 04 Dec 2007

Design & development

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Reference designs

TIDA-00034 — Overvoltage and Overcurrent Protection IC & Li+ Charger Front-End Protection IC Reference Design

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 (...)
Reference designs

PMP4651 — Contactless Charger 30mA Single Li-Ion

Complete wireless charger set for small Li-Ion battery charging system. The nominal output curent is 30mA on a single cell battery, while the intput comes from an USB source.
Reference designs

PMP2562 — Contactless Battery Charger

This reference design is a very small resonant Flyback converter coupled via air (few millimeter distance) from a "receiver". ~ 250mW is wirelessly transferred with an efficiency of 65%.
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WSON (DSG) 8 View options

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