BQ25173 Series
800-mA linear charger for 1-cell to 4-cell supercapacitor
Manufacturer: Texas Instruments
Catalog
800-mA linear charger for 1-cell to 4-cell supercapacitor
Key Features
• Input voltage up-to 40-V tolerantAutomatic Sleep mode for low power consumption350-nA leakage current2-µA input leakage current when charge disabledSupports 1- to 4-cell supercapacitorSupports charging supercapacitor from 0 VExternal resistor programmable operationFB pin to adjust supercapacitor regulation voltageISET to set charge current from 10 mA to 800 mAHigh accuracy±1% charge voltage accuracy±10% charge current accuracyCharging featuresCEpin for charging function controlOpen-drain output for status and fault indicationOpen-drain output for power-good indicationIntegrated fault protection18-V IN overvoltage protection1000-mA overcurrent protection125°C thermal regulation; 150°C thermal shutdown protectionOUT short-circuit protectionISET pin short/open protectionInput voltage up-to 40-V tolerantAutomatic Sleep mode for low power consumption350-nA leakage current2-µA input leakage current when charge disabledSupports 1- to 4-cell supercapacitorSupports charging supercapacitor from 0 VExternal resistor programmable operationFB pin to adjust supercapacitor regulation voltageISET to set charge current from 10 mA to 800 mAHigh accuracy±1% charge voltage accuracy±10% charge current accuracyCharging featuresCEpin for charging function controlOpen-drain output for status and fault indicationOpen-drain output for power-good indicationIntegrated fault protection18-V IN overvoltage protection1000-mA overcurrent protection125°C thermal regulation; 150°C thermal shutdown protectionOUT short-circuit protectionISET pin short/open protection
Description
AI
The BQ25173 is an integrated 800-mA linear charger for 1- to 4-cell supercapacitors targeted at space-limited applications. The device has a single power output that charges the supercapacitor. The system load can be placed in parallel with the supercapacitor; the charge current is shared between the system and supercapacitor.
During charging, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold, TREG, is exceeded. This feature allows for fast charging of a fully discharged supercapacitor.
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 charge function control. The charge voltage and fast-charge current are programmable through external resistors.
The BQ25173 is an integrated 800-mA linear charger for 1- to 4-cell supercapacitors targeted at space-limited applications. The device has a single power output that charges the supercapacitor. The system load can be placed in parallel with the supercapacitor; the charge current is shared between the system and supercapacitor.
During charging, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold, TREG, is exceeded. This feature allows for fast charging of a fully discharged supercapacitor.
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 charge function control. The charge voltage and fast-charge current are programmable through external resistors.
