• BQ25175: Charging permanently disabled/damaged after battery removal

  

  MUHAMMAD ASIM ZIA

  Part Number: BQ25175 Tool/software: Hi TI, I recently had an experience where the system functioned correctly, fast charging at 3V for 1S1P, 1S2P battery configurations. However, during my testing, I disconnected the battery connector while the USB…

  • 11 months ago
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum
Answered

• BQ25175: Check whether the temperature range can be adjusted using the TS pin of BQ25175.

  

  Grady Lee

  Resolved

  Part Number: BQ25175 Other Parts Discussed in Thread: BQ25170 Hi, TI experts. Is it possible to control the temperature range with the TS pin of BQ25175? If possible, could you explain how? Please check. Thank you.

  • Resolved

  • over 2 years ago
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum
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
  • Power management
  • Power management forum

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