Data Sheet

IN
VSS
BAT
DC+
GND
Adaptor
HOSTbq24072
bq24073
CE
OUT
TD
EN1
EN2
TS
TEMP
PACK+
PACK-
SYSTEM
ISET
PGOOD
CHG
TMR
ILM
R3
1.13kW
R4
1.5kW
R1
46.4kW
R2
1.18kW
R5
1.5kW
C2
4.7 Fm
C1
1 Fm
C3
4.7 Fm
bq24072 , bq24073 , bq24074 , bq24075 , bq24079
www.ti.com SLUS810K –SEPTEMBER 2008–REVISED MARCH 2015
10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
The bq2407x devices power the system while simultaneously and independently charging the battery. The input
power source for charging the battery and running the system can be an AC adapter or a USB port. The devices
feature dynamic power-path management (DPPM), which shares the source current between the system and
battery charging and automatically reduces the charging current if the system load increases. When charging
from a USB port, the input dynamic power management (VIN-DPM) circuit reduces the input current limit if the
input voltage falls below a threshold, preventing the USB port from crashing. The power-path architecture also
permits the battery to supplement the system current requirements when the adapter cannot deliver the peak
system currents.
The bq2407x is configurable to be host controlled for selecting different input current limits based on the input
source connected, or a fully stand alone device for applications that do not support multiple types of input
sources.
10.2 Typical Application
V
IN
= UVLO to V
OVP
, I
FASTCHG
= 800 mA, I
IN(MAX)
= 1.3 A, Battery Temperature Charge Range = 0°C to 50°C,
6.25-hour Fastcharge Safety Timer
Figure 30. Using bq24072/ bq24073 in a Host-Controlled Charger Application
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Product Folder Links: bq24072 bq24073 bq24074 bq24075 bq24079