IN

VSS

BAT

DC

GND

Adaptor

bq24230

OUT

EN2

TS

TEMP

PACK+

PACK-

SYSTEM

TD

13

8

15

1

2

3

5

10

11

1mF

4.7mF

1 k

2.94 k

1 k

4.32 k

4.7mF

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

bq24230, bq24232

SLUS821I – OCTOBER 2008 – REVISED NOVEMBER 2015

bq2423x USB-Friendly Lithium-Ion Battery Charger And Power-Path Management IC

The

bq2423x

features

dynamic

power-path

1 Features

management (DPPM) that powers the system while

1

•

Fully Compliant USB Charger

simultaneously

and

independently

charging

the

–

Selectable 100-mA and 500-mA Maximum

battery. The DPPM circuit reduces the charge current

Input Current

when the input current limit causes the system output

to fall to the DPPM threshold, thus supplying the

–

100-mA Maximum Current Limit Ensures

system load at all times while monitoring the charge

Compliance to USB-IF Standard

current separately. This feature reduces the number

–

Input-based Dynamic Power Management

of charge and discharge cycles on the battery, allows

for proper charge termination, and enables the

Sources

system to run with a defective or absent battery pack.

Additionally, this enables instant system turn-on even

•

28-V Input Rating With Overvoltage Protection

with a totally discharged battery. The power-path

•

Integrated Dynamic Power-Path Management

management architecture also permits the battery to

(DPPM) Function Simultaneously and

supplement the system current requirements when

Independently Powers the System and Charges

the adapter cannot deliver the peak system currents,

the Battery

enabling the use of a smaller adapter.

•

Supports up to 500-mA Charge Current With

The battery is charged in three phases: conditioning,

Current Monitoring Output (ISET)

constant current, and constant voltage. In all charge

•

Programmable Input Current Limit up to 500 mA

phases, an internal control loop monitors the IC

for Wall Adapters

junction temperature and reduces the charge current

if the internal temperature threshold is exceeded.

•

Programmable Termination Current (bq24232)

•

Programmable Precharge and Fast-Charge Safety

The charger power stage and charge current sense

functions are fully integrated. The charger function

Timers

has high-accuracy current and voltage regulation

•

Reverse Current, Short-Circuit, and Thermal

loops, charge status display, and charge termination.

Protection

The input current limit and charge current are

•

NTC Thermistor Input

programmable using external resistors.

•

Proprietary Start-Up Sequence Limits Inrush

Current

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Status Indication – Charging/Done, Power Good

bq24230

•

Small 3 mm × 3 mm 16-Lead QFN Package

VQFN (16)

3.00 mm × 3.00 mm

bq24232

2 Applications

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

the end of the datasheet.

•

Bluetooth™ Devices

•

Low-Power Handheld Devices

Typical Application Circuit

3 Description

The bq2423x series of devices are highly 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 ac adapter and support charge

currents between 25 mA and 500 mA. The high-input-

voltage

range

with

input

overvoltage

protection

supports low-cost, unregulated adapters. The USB

input current limit accuracy and start-up sequence

allow the bq2423x to meet USB-IF inrush current

specification. Additionally, the input dynamic power

crashing poorly designed or incorrectly configured

USB sources.

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.