• BQ25176K: Difference between BQ25176K and BQ25176J

  

  Marvn Arcangel

  Part Number: BQ25176K Other Parts Discussed in Thread: BQ25176J , Tool/software: Hi Experts, Quick question, what is the difference between BQ25176K and BQ25176J? I checked the datasheet and they seem identical. Thanks, Marvin A

  • 9 months ago
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• BQ25176K: Any single cell linear charger with charge terminate @ 4.25V?

  

  Christina Lim

  Part Number: BQ25176K Other Parts Discussed in Thread: BQ25176J Hi, I'm looking for any single cell linear charger with a terminate voltage at 4.25V. Is BQ25176K a right fit? Thanks, Christina

  • 8 months ago
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Answered

• [FAQ] BQ2517x: How should the PCB be designed to minimize heating of BQ2517x devices? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

  

  Ibraheem Alkhawam

  Resolved

  Part Number: BQ25172 Because the BQ2517x ICs are linear regulators, thermal PCB layout is critical: Exposed thermal pad: Must be soldered to GND with good coverage. Thermal vias: Use multiple vias near/under the IC to connect top-side copper…

  • Resolved

  • 2 months ago
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Answered

• [FAQ] BQ2517x: Why does charge current appear lower than configured, and how can this be verified? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

  

  Ibraheem Alkhawam

  Resolved

  Part Number: BQ25172 Reduced charge current is most commonly caused by thermal regulation (TREG) limiting output current to protect the die. Other causes include: A current meter (ammeter) placed in series with the output — even a low-resistance…

  • Resolved

  • 2 months ago
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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

  

  Ibraheem Alkhawam

  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…

  • Resolved

  • 2 months ago
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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

  

  Ibraheem Alkhawam

  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…

  • Resolved

  • 2 months ago
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Answered

• [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

  

  Ibraheem Alkhawam

  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…

  • Resolved

  • 2 months ago
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Answered

• [FAQ] BQ2517x: Why does the charge timer run longer than expected, and what causes the safety timer to extend? BQ25171-Q1, BQ25173-Q1, BQ25170, BQ25172, BQ25173, BQ25176J, BQ25176K, BQ25176M, BQ25175

  

  Ibraheem Alkhawam

  Resolved

  Part Number: BQ25172 Other Parts Discussed in Thread: BQ25176J The most common cause of the charge timer running longer than programmed is thermal regulation (TREG) . When the die temperature reaches the TREG threshold, the device: (1) reduces output…

  • Resolved

  • 2 months ago
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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

  

  Ibraheem Alkhawam

  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…

  • Resolved

  • 2 months ago
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Answered

• [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

  

  Ibraheem Alkhawam

  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…

  • Resolved

  • 2 months ago
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