深圳市中立信电子科技有限公司

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 USB-IF

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.

Applications

• Smart Phones

• Portable Media Players

• Portable Navigation Devices

• Low-Power Handheld Devices