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| BQ24232H_15 Datasheet, PDF (14/42 Pages) Texas Instruments – bq2423xx USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC | |||
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bq24230H, bq24232H
SLUSBI8A â JANUARY 2014 â REVISED DECEMBER 2014
Feature Description (continued)
www.ti.com
PGOOD = Hi -Z
CHG = Hi -Z
BATTFET ON
VUVLO<VIN <VOVP No
and
V IN > V BAT+ V IN (DT)
Yes
PGOOD = Low
Begin Startup
IIN (MAX)100 mA
Yes
VOUTshort ?
No
Input Current
Limit set by EN 1
and EN2
Yes
EN 1= EN 2 =1
No
Yes
ILIM or ISET short ?
No
CE = Low
Yes
Begin Charging
No
Figure 11. Start-up Flow Diagram
9.3.3 Power-Path Management
The bq2423xH features an OUT output that powers the external load connected to the battery. This output is
active whenever a source is connected to IN or BAT. The following sections discuss the behavior of OUT with a
source connected to IN to charge the battery and a battery source only.
9.3.3.1 Input Source Connected â Adapter or USB
With a source connected, the power-path management circuitry of the bq2423xH monitors the input current
continuously. The OUT output is regulated to a fixed voltage (VO(REG)). The current into IN is shared between
charging the battery and powering the system load at OUT. The bq2423xH has internal selectable current limits
of 100 mA (USB100) and 500 mA (USB500) for charging from USB ports, as well as a resistor-programmable
input current limit.
14
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Product Folder Links: bq24230H bq24232H
Copyright © 2014, Texas Instruments Incorporated
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