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    Answered

  • [FAQ] BQ2517x: Why does the charge current become lower than configured, and what is thermal regulation (TREG)? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

    Resolved
    Part Number: BQ25172 The BQ2517x family are linear (LDO) chargers . Power dissipation = (VIN − VOUT) × IOUT. When this dissipation causes the die temperature to reach ~125°C (TREG threshold), the device automatically reduces output current to prevent…
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    • Answered

  • [FAQ] BQ2517x: How is charging current set and dynamically changed, and what does the ISET pin voltage indicate? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

    Resolved
    Part Number: BQ25172 Charge current is set by a resistor to GND on the ISET pin: IOUT = KISET / RISET, where KISET = 300 ±10% (Ohms·mA) for the BQ2517x family. For example, RISET = 600ohms → IOUT ≈ 500mA. The ISET pin also serves as a real-time current…
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  • [FAQ] BQ2517x: Why does the STAT pin behave unexpectedly (always ON or cycling) when no battery is connected? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

    Resolved
    Part Number: BQ25172 When no battery is connected, the BQ2517x family does not have a battery detection feature. Instead, the IC charges the output capacitor toward the BAT OVP threshold, then shuts off. The output capacitor discharges back through…
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    • Answered

  • BQ25176J: Battery charger using USB Type C

    Resolved
    Part Number: BQ25176J Other Parts Discussed in Thread: BQ25171-Q1 , BQ25172 Tool/software: Hi, We are planning to use BQ25176J with USB Type C for below condition: 1. Able to charge 3 Duracell (1.5v) or 2 Li-ion (5v) 2. Charging current should be…
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    • Answered

  • [FAQ] BQ2517x: What is the correct STAT pin behavior and what voltage reference should be used for the STAT pin pull-up? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

    Resolved
    Part Number: BQ25172 STAT pin states (open-drain, active low): Charging in progress: STAT pulled LOW (LED on if pull-up connected) Charge complete / Standby: STAT HIGH (LED off) Fault (VIN OVP, BAT OVP, BAT OCP): STAT blinks at 1Hz Thermal…
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  • [FAQ] BQ2517x: What causes the STAT pin to blink at 1Hz, and does it continue blinking as long as the fault persists? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

    Resolved
    Part Number: BQ25172 The STAT pin blinks at 1Hz to indicate a fault condition. Fault conditions that trigger 1Hz blinking include: VIN OVP, BAT OVP, BAT OCP, and Open/Short on VSET, ISET, or TMR pins. When no battery is connected, the output capacitor…
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    • Answered

  • [FAQ] BQ2517x: Can VSET or TMR resistor values be chosen freely to get any charge voltage or time, or are only specific values valid? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M

    Resolved
    Part Number: BQ25172 The VSET and TMR pins on all BQ2517x devices operate as digital bin systems , not analog. At startup, a calibrated current pulse is applied to the pin and the resulting voltage is measured and compared to a lookup table of predefined…
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  • BQ25176J: how to calculate alternative value for RVset

    Resolved
    Part Number: BQ25176J Hi dear people, at the end, I am going to use the BQ25176J to charge a LIC. The producer of the LIC recommends the following values: ISET=750mA Best charging voltage 3.8V. If you cannot set 3.8V, please set 3.7V The data sheet…
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  • [FAQ] BQ2517x: How should the TS pin be configured if no NTC thermistor is used, and can the TS pin be used as a charge enable/disable? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

    Resolved
    Part Number: BQ25172 If no NTC temperature monitoring is needed, connect a 10 kOhm resistor from TS to GND . This biases the TS pin within the normal operating range (~350–380 mV with the internal 38 µA current source), preventing any false hot/cold…
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  • BQ25176J: Load sharing, how does it work?

    Resolved
    Part Number: BQ25176J Other Parts Discussed in Thread: BQ24075 My load is 500mA, and wanna charge the battery using 100mA. Should I use ISET which results in an ICHG = 600mA ? What if my load is lowered to 100mA, will then the "spare" current 500mA…
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