1 Features
• Fully compliant USB charger
– Selectable 100-mA and 500-mA maximum
input current
– 100-mA Maximum current limit ensures
compliance to USB-IF standard
– Input-based dynamic power management (VINDPM)
for protection against poor USB sources
• Functional Safety-Capable (BQ24074)
– Documentation available to aid functional safety
system design
• 28-V Input rating with overvoltage protection
• Integrated dynamic power path management
(DPPM) function simultaneously and
independently powers the system and charges the
battery
• Supports up to 1.5-A charge current with current
monitoring output (ISET)
• Programmable input current limit up to 1.5 A for
wall adapters
• System output tracks battery voltage (BQ24072)
• Programmable termination current (BQ24074)
• Battery disconnect function with SYSOFF input
(BQ24075, BQ24079)
• Programmable pre-charge and fast-charge safety
timers
• Reverse current, short-circuit and thermal
protection
• NTC thermistor input
• Proprietary start-up sequence limits inrush current
• Status indication – charging/done, power good
• Safety-Related Certification:
– IEC 62368-1 Certification (BQ24072)

2 Applications
• TWS Charging case and headphones
• Gaming accessory
• Video doorbells, IP network cameras
• Asset tracking and fleet management
• Portable medical devices

3 Description
The BQ2407x series of devices are integrated
Li-Ion linear chargers and system power path
management devices targeted at space-limited
portable applications. The devices operate from either
a USB port or an AC adapter and support charge
currents up to 1.5 A. The input voltage range with
input overvoltage protection supports unregulated
adapters. The USB input current limit accuracy and
start up sequence allow the BQ2407x to meet USBIF
USBIF
inrush current specifications. Additionally, the input
dynamic power management (VIN-DPM) prevents the
charger from crashing incorrectly configured USB
sources.
The BQ2407x features dynamic power path
management (DPPM) that powers the system
while simultaneously and independently charging the
battery. The DPPM circuit reduces the charge current
when the input current limit causes the system output
to fall to the DPPM threshold; thus, supplying the
system load at all times while monitoring the charge
current separately. This feature reduces the number
of charge and discharge cycles on the battery, allows
for proper charge termination and enables the system
to run with a defective or absent battery pack.