1 Features

Charge

–1% charging voltage accuracy

–10% charge current accuracy

– Pin selectable USB 100mA and 500mA

Maximum input current limit

– Programmable termination and precharge

Threshold, BQ24040 and BQ24045

– High voltage (4.35V) chemical support, with

BQ24045

Protect

–30V input rating; 6.6V or 7.1V input

Over voltage protection

– Input voltage dynamic power management

–125°C heat regulation; 150°C heat

Shutdown Protection

– Output short circuit protection and ISET short circuit

Investigate

– Operates in JEITA range via battery NTC –

1/2 fast charge current when cold, 4.06 volts when hot,

BQ24040 and BQ24045

– Fixed 10 hour safety timer, BQ24040 and

BQ24045

system

– Auto kill and timer disable modes

For battery packs without thermistors,

BQ24040 and BQ24045

– Status Indication – Charging Complete

– Available in a small size of 2 × 2 mm2

DFN-10 Packaging

– Automatic start function integrated in the production line

Test, BQ24041

Functional safety type (BQ24040)

– Documentation that contributes to functional safety

system design

Safety related certifications:

– IEC 62368-1 CB certification (BQ24040,

BQ24045) 2 application

2 applications

TWS Headphones and Headphones

Smart Watches and Wristbands

wireless speaker

moving position

Portable Medical Equipment

3 Description

BQ2404x series devices are highly integrated

Li-Ion and Li-Polymer linear charger devices target

Portable applications with limited space. these devices

Operates from a Universal Serial Bus port or AC adapter. This

High input voltage range with input overvoltage

Protection supports low cost unregulated adapters.

The BQ2404x has a single supply output for charging

Battery. System loads can be placed in parallel

Use battery as long as average system load

Does not prevent the battery from fully charging during charging

10 hour safety timer.

The battery is charged in three stages: conditioning,

Constant current and constant voltage. take full charge of

stage, the internal control loop monitors the IC

junction temperature and reduce charge current

If the internal temperature threshold is exceeded.

Charger Power Stage and Charge Current Sensing

Features are fully integrated. Charger function

With high precision current and voltage regulation

Loop, charge status display and charge termination.

Precharge Current and Termination Current

Threshold through external

Resistors on BQ24040 and BQ24045. fast

The charge current value can also be passed through

external resistor.