BQ24153 Datasheet, PDF (15/40 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support

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OPERATIONAL FLOW CHART
bq24153
bq24156, bq24158
SLUSA27 – MARCH 2010
Power Up
V BUS > V UVLO
V CSOUT < V LOWV
No
Reset and Start
15-M inute T imer
POR
Load I² C Registers
Yes
with Default Value
/CE = LOW
Disable Charge
Charge Configure
Mode
/CE = HIGH
High Impedance Mode or Host
Controlled Operation Mode
Any Charge State
Wait Mode
Delay TINT
V CSOPUT < V SHORT ?
No
Disable Charge
Indicate Power
not Good
Yes
No
Enable I _SHORT
Indicate Short
Circuit condition
Yes
V BUS < V IN ( MIN ) ?
No
15- Minute
Timer Expired ?
Regulate
Input Current , Charge
Current or Voltage
Yes
Indicate Charge- In -
Progress
Yes
VBUS < V IN ( MIN ) ?
Yes
No
15-Minute
No
Timer Expired ?
Yes
Turn Off Charge
Enable I _DETECT for
t DETECT
Turn Off Charge
Indicate Fault
/CE =HIGH
No
VCSOUT < V SHORT ?
No
Termination Enabled
ITERM detected
and VCSOUT > V OREG -V RCH
?
Yes
Yes
V CSOUT < VOREG -
V RCH ?
No
15-Minute Timer
Active ?
Yes
Charge Complete
High Impedance
Mode
Battery Removed
Yes
Reset Charge
Parameters
Wait Mode
Delay TINT
No
No
Charge Complete
Indicate DONE
V CSOUT < V OREG -
VRCH ?
Yes
Figure 25. Operational Flow Chart of bq2415x in Charge Mode
DETAILED FUNCTIONAL DESCRIPTION
For a current restricted power source, such as a USB host or hub, a high efficiency converter is critical to fully
use the input power capacity for quickly charging the battery. Due to the high efficiency for a wide range of input
voltages and battery voltages, the switch mode charger is a good choice for high speed charging with less power
loss and better thermal management than a linear charger.
The bq24153/6/8 are highly integrated synchronous switch-mode chargers, featuring integrated FETs and small
external components, targeted at extremely space-limited portable applications powered by 1-cell Li-Ion or
Li-polymer battery pack. Furthermore, bq24153/8 also has bi-directional operation to achieve boost function for
USB OTG support.
Copyright © 2010, Texas Instruments Incorporated
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Product Folder Link(s): bq24153 bq24156 bq24158