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Parameters

Number of series cells 1 Charge current (Max) (A) 6 Operating Vin (Max) (V) 12 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 4.65 Absolute Vin (safety rating) (Max) ((V)) 20 Control topology Flash Charger Control interface I2C Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, Integrated ADC Operating Vin (Min) (V) 3.2 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

DSBGA (YFF) 56 9 mm² 2.823 x 3.371 open-in-new Find other Battery charger ICs

Features

  • 97% Efficient power stage for 6-A fast charge
  • Patent pending switched cap charger architecture optimized for 50% duty cycle
    • Input voltage is 2x battery voltage (3.5 V to 4.65 V)
    • Output current is 2x of input current (up to 4.5 A)
    • Reduces power loss across the cable
  • Integrated programmable protection features for safe operation
    • Input overvoltage protection (BUS_OVP)
    • Input overcurrent protection (BUS_OCP) with adjustable alarm
    • Input overvoltage with external OVP FET (VAC_OVP up to 17 V)
    • Battery overvoltage protection (BAT_OVP) with adjustable alarm
    • Output overvoltage (VOUT_OVP)
    • Input overcurrent protection (BUS_OCP) with adjustable alarm
    • IBAT overcurrent protection (BAT_OCP) with adjustable alarm
    • Switching MOSFET cycle-by-cycle current limit
    • Battery temperature monitoring
    • Connector temperature monitoring
  • Programmable settings for system optimization
    • STAT, FLAG, and MASK options for interrupts
    • ADC readings and configuration
  • Integrated 16-bit effective analog-to digital converter (ADC)
    • ±0.5% BUS voltage
    • ±0.5% VOUT voltage
    • –0.4% to 0.2% BAT voltage with differential sensing
    • ±1.5% BAT current at 6 A with external RSENSE
    • ±1% BAT temperature
    • ±1% BUS temperature
    • ±4°C die temperature

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Description

The BQ25968 is a 97% efficient, 6-A battery charging solution using a switched cap architecture. This architecture and the integrated FETs are optimized to enable a 50% duty cycle, allowing the cable current to be half the current delivered to the battery, reducing the losses over the charging cable as well as limiting the temperature rise in the application.

The dual-phase architecture increases charging efficiency and reduces the input and ouput cap requirements. When used with a main charger such as BQ25790, the system enables the fastest charging at the lowest power loss from precharge through CC, CV, and termination.

The dual-phase architecture reduces the input cap requirements as well as reducing the output voltage ripple. When used with a standard charger such as the BQ2589x, the system enables the fastest charging at the lowest power loss from precharge through CC, CV, and termination.

The device integrates all the necessary protection features to ensure safe charging, including input over-voltage and over-current protection, output overvoltage and overcurrent protection, temperature sensing for the battery and cable, and monitoring the die temperature.

The device includes a 12-bit effective analog-to-digital converter (ADC) to provide bus voltage, bus current, output voltage, battery voltage, battery current, bus temperature, bat temperature, die temperature, and other calculated measurements needed to manage the charging of the battery from the smart wall adapter or power bank.

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Technical documentation

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Type Title Date
* Datasheet BQ25968 I2C Controlled Single Cell High Efficiency 6-A Switched Cap Fast Charger With ADC datasheet (Rev. A) Feb. 19, 2021
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014

Design & development

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