1 Features

• AEC-Q100 qualified for automotive applications

– Temperature grade 1: –40°C ≤ TA ≤ 125°C

– HBM ESD classification level 2

– CDM ESD classification level C4B

• 40-V load-dump tolerant to support charging backup

supercapacitor, 3-V to 18-V operating

• Automatic Sleep mode for low power consumption

– 350-nA output leakage current

– 2-μA input leakage current when charge

disabled

• Support 1- to 4-cell supercapacitor charging from 0

V

• External resistor programmable operation

– FB pin to adjust supercapacitor regulation

voltage

– ISET to set charge current from 10 mA to 800

mA

• High accuracy

– ±1 charge voltage accuracy

– ±10 charge current accuracy

• Charging features

– CE pin for charging function control

– Open-drain output for status and fault indication

– Open-drain output for power-good indication

• Integrated fault protection

– 18-V IN overvoltage protection

– 1000-mA overcurrent protection

– 125°C thermal regulation; 150°C thermal

shutdown protection

– ISET pin short protection

2 Applications

• Telematics control unit (TCU)

• Emergency call (eCall)

• Fleet management, asset tracking

3 Description

The BQ25173-Q1 is an automotive rated, 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 and 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.