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BQ25176J

ACTIVE

800-mA linear charger for one-cell Li-ion and LiFePO4 with VINDPM and JEITA

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Data sheet

BQ25176J

ACTIVE
Data sheet Order now

Product details

Number of series cells 1 Charge current (max) (A) 0.8 Vin (max) (V) 25 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 4.4 Absolute max Vin (max) (V) 30 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 3 Rating Catalog Operating temperature range (°C) -40 to 125
Number of series cells 1 Charge current (max) (A) 0.8 Vin (max) (V) 25 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 4.4 Absolute max Vin (max) (V) 30 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 3 Rating Catalog Operating temperature range (°C) -40 to 125
WSON (DSG) 8 4 mm² 2 x 2
  • Input voltage up to 30 V tolerant
  • Input Voltage Based Dynamic Power Management (VINDPM)
  • Automatic Sleep Mode for low power consumption
    • 350-nA battery leakage current
    • 80-µA input leakage current when charge disabled
  • Supports 1-cell Li-Ion, Li-Poly, and LiFePO 4
  • External resistor programmable operation
    • VSET to set battery regulation voltage:
      • Li-Ion: 4.05 V, 4.15 V, 4.2 V, 4.35 V, 4.4 V
      • LiFePO 4: 3.5 V, 3.6 V, 3.7 V
    • ISET to set charge current from 10 mA to 800 mA
  • High accuracy
    • ±0.5% charge voltage accuracy
    • ±10% charge current accuracy
  • Charging features
    • Precharge current 20% of ISET
    • Termination current 10% of ISET
    • NTC thermistor input to monitor battery temperature
    • TS pin for charging operation control over JEITA range
    • Open-drain output for status and fault indication
  • Integrated fault protection
    • 26-V IN overvoltage protection
    • VSET based OUT overvoltage protection
    • 1000-mA overcurrent protection
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection
    • VSET, ISET pins short/open protection
  • Input voltage up to 30 V tolerant
  • Input Voltage Based Dynamic Power Management (VINDPM)
  • Automatic Sleep Mode for low power consumption
    • 350-nA battery leakage current
    • 80-µA input leakage current when charge disabled
  • Supports 1-cell Li-Ion, Li-Poly, and LiFePO 4
  • External resistor programmable operation
    • VSET to set battery regulation voltage:
      • Li-Ion: 4.05 V, 4.15 V, 4.2 V, 4.35 V, 4.4 V
      • LiFePO 4: 3.5 V, 3.6 V, 3.7 V
    • ISET to set charge current from 10 mA to 800 mA
  • High accuracy
    • ±0.5% charge voltage accuracy
    • ±10% charge current accuracy
  • Charging features
    • Precharge current 20% of ISET
    • Termination current 10% of ISET
    • NTC thermistor input to monitor battery temperature
    • TS pin for charging operation control over JEITA range
    • Open-drain output for status and fault indication
  • Integrated fault protection
    • 26-V IN overvoltage protection
    • VSET based OUT overvoltage protection
    • 1000-mA overcurrent protection
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection
    • VSET, ISET pins short/open protection

The BQ25176J is an integrated 800-mA linear charger for 1-cell Li-Ion, Li-Polymer, and LiFePO 4 batteries targeted at space-limited portable applications. The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.

The device has four phases for charging a Li-Ion/Li-Poly battery: trickle charge to bring the battery voltage up to V BAT_SHORT, precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.

In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold, T REG, is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and automatic charge termination. The charge voltage and fast charge current are programmable through external resistors. The precharge and termination current threshold track the fast charge current setting.

The BQ25176J is an integrated 800-mA linear charger for 1-cell Li-Ion, Li-Polymer, and LiFePO 4 batteries targeted at space-limited portable applications. The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.

The device has four phases for charging a Li-Ion/Li-Poly battery: trickle charge to bring the battery voltage up to V BAT_SHORT, precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.

In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold, T REG, is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and automatic charge termination. The charge voltage and fast charge current are programmable through external resistors. The precharge and termination current threshold track the fast charge current setting.
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* Data sheet BQ25176J: 800-mA JEITA-Compliant Linear Battery Charger For 1-Cell Li-Ion and LiFePO4With VINDPM datasheet PDF | HTML 31 Oct 2023

Design & development

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Evaluation board

BQ25176JEVM — BQ25176J evaluation module for 800-mA linear battery charger

BQ25176JEVM is designed to evaluate and test the various operating modes of the BQ25176J.
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