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SLUS810A – SEPTEMBER 2008 – REVISED DECEMBER 2008
1.5A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC
1
•
FEATURES
Fully Compliant USB Charger
– Selectable 100mA and 500mA Maximum
Input Current
– 100mA Maximum Current Limit Ensures
Compliance to USB-IF Standard
– Input based Dynamic Power Management
(V
IN
-DPM) for Protection Against Poor USB
Sources
28V 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 1.5A Charge Current with
Current Monitoring Output (ISET)
Programmable Input Current Limit up to 1.5A
for Wall Adapters
System Output Tracks Battery Voltage
(bq24072)
Programmable Termination Current (bq24074)
Battery Disconnect Function with SYSOFF
Input (bq24075)
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
Small 3 mm × 3 mm 16 Lead QFN Package
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 AC adapter and support charge currents up to
1.5A. 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
specification. Additionally, the input dynamic power
management (V
IN
-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.
Typical Application Circuit
1kW
1kW
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7
PGOOD
IN
1
m
F
IN
13
CHG
9
OUT
10
11
SYSTEM
4.7
m
F
8
VSS
bq24075
EN
2
BAT
5
2
3
APPLICATIONS
Smart Phones
Portable Media Players
Portable Navigation Devices
Low-Power Handheld Devices
System
ON/OFF
Control
15
SYSOFF
ISET
TMR
EN1
ILM
4.7
m
F
PACK+
CE
TS
1
TEMP
14
12
16
4
6
1.18kW
1.13kW
PACK-
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
