BQ24180_1 Datasheet, PDF (15/41 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and Accessory Power Connection

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bq24180
SLUSA02 A – FEBRUARY 2010 – REVISED FEBRUARY 2010
Adapter Plug IN
Watchdog Active
Active Host
Communication
No
VUVLO < VIN < VOVP?
Yes
No
Hi-Z bit = 0?
Yes
No
/CE bit = 0?
Yes
Good Adapter
No
connected?
Yes
Begin Safety Timer
Enable Hi-Z Mode
Wait 2s
VHIGH<VIN<VOVP
No
Yes
Enable 50mA
precharge current
Timer 2x
STAT = 0
VBAT > 2V?
No
Enable 50mA
precharge current
STAT = 0
Begin HOST
Mode Battery
Charging
Figure 26. Startup on Adapter Plug-In in Host-Controlled Mode
Charge Profile
In charge mode, bq24180 has five control loops to regulate input voltage, input current, charge current, charge
voltage and device junction temperature. During the charging process, all five loops are enabled and the one that
is dominant will take over the control. The bq24180 supports a precision Li-ion or Li-polymer charging system for
single-cell applications. Figure 27 indicates a typical charge profile without input current regulation loop and it is
similar to the traditional CC/CV charge curve, while Figure 27 shows a typical charge profile when input current
limiting loop is dominant during the constant current mode, and in this case the charge current is higher than the
input current so the charge process is faster than the linear chargers. For bq24180, the input current limits, the
charge current, termination current, and charge voltage are all programmable using I²C interface.
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): bq24180
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