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BQ25173 ACTIVE

800-mA linear charger for 1-cell to 4-cell supercapacitor

BQ25173 800-mA Linear Battery Charger for 1- to 4-Cell Supercapacitor datasheet (pdf, 2.85 MB)

Parameters

Operating Vin(Max)(V)	18
Rating	Catalog
Control interface	Standalone (RC-Settable)
Features	IC thermal regulation Input OVP
Battery charge voltage(Max)(V)	10.5
Absolute Vin (safety rating)(Max)((V))	40
Operating Vin(Min)(V)	3
Charge current(Max)(A)	0.8
Cell chemistry	SuperCap
Function	Charger
Number of series cells	1 2 3 4

Features & description

Input voltage up-to 40-V tolerant
Automatic Sleep mode for low power consumption
- 350-nA leakage current
- 2-µA input leakage current when charge disabled
Supports 1- to 4-cell supercapacitor
Supports charging supercapacitor 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
- OUT short-circuit protection
- ISET pin short/open protection

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, T_REG, 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.