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Frequent questions

  • [FAQ] BQ25792: Why does the SYS output of the evaluation module (EVM) collapse when no battery (or battery simulator) is attached to the BAT pins?

    Part Number: BQ25792 The EVMs are configured to simulate working with a battery with a thermistor. When the battery is removed but the simulated thermistor is still present, the charger continues to change the BAT as a battery is present. The charger…

  • [FAQ] BQ25792: What is the expected output voltage and how much dc resistive load can the SDRV pin provide?

    Part Number: BQ25792 The BQ25792 SDRV pin output rises to approximately 5V above the voltage sensed at the BATP pin. The SDRV pin charge pump output is designed only for charging a capacitive load, like at the gate of a FET. It cannot drive a dc resistive…

  • [FAQ] BQ25792: What voltage does this narrow voltage DC (NVDC) charger regulate the SYS output to if no battery is attached and charge is disabled?

    Part Number: BQ25792 With charge disabled and no battery attached, BQ25792 regulates SYS to the MINSYS (SYSMIN) voltage set by the BQ25792 Minimal System Voltage Register REG00[5:0].

  • [FAQ] TPS544C25: How to set Vout using Pin strap and using PMBUS

    Part Number: TPS544C25 Other Parts Discussed in Thread: TPS544B25 This FAQ discusses how to set the Vout for TPS544C25, TPS544B25 Using Feedback Divider Network without PMBUS If you want the converter to start to a default 0.84V as an example, here…

  • [FAQ] BQ25601: [FAQ] Why does the LED connected to STAT pin flashes and the SYS voltage unstable when battery is not connected for BQ25601, BQ25601D, BQ25606, BQ25611D, BQ25616, BQ25616J, BQ25618, BQ25619, BQ25600, BQ25600D, BQ25600C?

    Part Number: BQ25601 Other Parts Discussed in Thread: BQ25600 , , BQ25618 , BQ25606 , BQ25600D , BQ25616 , BQ25619 , , BQ25600C , BQ25611D Hi, The LED on the battery charger evaluation module (EVM) flashes and the SYS voltage is not stable when the…

  • [FAQ] BQ25890: Why does the LED connected to STAT pin flashes and the SYS voltage unstable when battery is not connected for BQ25890, BQ25890H, BQ25892, BQ25895, BQ25895M, BQ25896, BQ25898, BQ25898D, BQ25898C, BQ24190, BQ24192, BQ24192I, BQ24193, BQ24195...

    Part Number: BQ25890 Other Parts Discussed in Thread: BQ24190 , BQ25898 , BQ24296 , BQ24192I , BQ25895 , BQ25896 , BQ24193 , BQ24192 , BQ24292I , , BQ24295 , BQ24298 , BQ25898C , BQ25898D , , BQ24259 , BQ25895M , BQ25892 , BQ24296M , BQ24195 , BQ24196…

  • [FAQ] Why does my e-load cause my high side switch to shut down?

    One common practice when people are using an e-load to mimic a resistive load is to use the e-load in constant current mode. However, by doing so the user will often experience unwanted device shutdowns. Why is this happening? Resistive loads in nature…

  • [FAQ] What is TI High Side Switches' extended voltage range?

    Sometimes the datasheet for TI High Side Switch will have a section called “extended voltage range” like below: The “extended supply voltage” is only for transient conditions such as cold crank (less than minimum nominal supply voltage) and surge…

  • [FAQ] What’s TI high side switch’s inrush current limit feature?

    Other Parts Discussed in Thread: TPS272C45 In some TI high side switches (ex. TPS272C45), there is a unique feature called “Inrush Current Handling”. It’s an additional feature built on top of the traditional fixed current limiting. The functionality…

  • [FAQ]Why VSYS does not start up normally when there is a loading on the SYS and the battery is not present for BQ25601, BQ25601D, BQ25606, BQ25611D, BQ25616, BQ25616J, BQ25618, BQ25619, BQ25600, BQ25600D, BQ25600C?

    Part Number: BQ25601D Other Parts Discussed in Thread: BQ25600 , BQ25601 , BQ25618 , BQ25606 , BQ25600D , BQ25616 , BQ25619 , , BQ25600C , BQ25611D Hi, It was observed that VSYS could not start up normally with some loading on SYS when the battery…

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