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.