1 F

m

1 F

m

1kW

1.5kW

1.5kW

2kW

DisconnectafterDetection

+

BatteryPack

VBUS

GND

D+

D-

USBPort

DC+

GND

Adaptor

VDD

D-

D+

GND

TTDM/BAT_EN

Host

SystemLoad

OR

ISET/100/500mA

1

2

3

4

5

10

9

8

7

6

IN

ISET

VSS

PRETERM

PG

NC

ISET2

CHG

TS

OUT

bq24040

+

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

bq24040, bq24041, bq24045

SLUS941F – SEPTEMBER 2009 – REVISED MARCH 2015

bq2404x 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start

1 Features

3 Description

The bq2404x series of devices are highly integrated

1

•

Charging

Li-Ion and Li-Pol linear chargers devices targeted at

–

1% Charge Voltage Accuracy

space-limited

portable

applications.

The

devices

–

10% Charge Current Accuracy

operate from either a USB port or AC adapter. The

high input voltage range with input overvoltage

–

Pin Selectable USB 100mA and 500mA

protection supports low-cost unregulated adapters.

Maximum Input Current Limit

The bq2404x has a single power output that charges

–

Programmable Termination and Precharge

the battery. A system load can be placed in parallel

Threshold, bq24040 and bq24045

with the battery as long as the average system load

–

High voltage (4.35V) Chemistry Support with

does not keep the battery from charging fully during

bq24045

the 10 hour safety timer.

•

Protection

The battery is charged in three phases: conditioning,

–

30V Input Rating; with 6.6V or 7.1V Input

constant current and constant voltage. In all charge

Overvoltage Protection

phases, an internal control loop monitors the IC

junction temperature and reduces the charge current

–

Input Voltage Dynamic Power Management

if an internal temperature threshold is exceeded.

–

125°C Thermal Regulation; 150°C Thermal

Shutdown Protection

The charger power stage and charge current sense

functions are fully integrated. The charger function

–

OUT Short-Circuit Protection and ISET short

has high accuracy current and voltage regulation

detection

loops, charge status display, and charge termination.

–

Operation over JEITA Range via Battery

The pre-charge current and termination current

NTC – 1/2 Fast-Charge-Current at Cold, 4.06V

threshold are programmed via an external resistor on

at Hot, bq24040 and bq24045

the bq24040 and bq24045. The fast charge current

value is also programmable via an external resistor.

–

Fixed 10 Hour Safety Timer, bq24040 and

bq24045

Device Information(1)

•

System

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

Automatic Termination and Timer Disable

bq24040

WSON (10)

2.00 mm x 2.00 mm

Mode (TTDM) for Absent Battery Pack With

bq24041

WSON (10)

2.00 mm x 2.00 mm

Thermistor, bq24040 and bq24045

bq24045

WSON (10)

2.00 mm x 2.00 mm

–

Status Indication – Charging/Done

(1) For all available packages, see the orderable addendum at

–

the end of the data sheet.

–

Integrated Auto Start Function for Production

Line Testing, bq24041

Simplified Schematic

2 Applications

•

Smart Phones

•

PDAs

•

MP3 Players

•

Low-Power Handheld Devices

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.