Datasheet

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bq24316
IN
OUT
Charger
Accessory
powersupply
EN
DIS
Battery
pack
torestof
system
e.g.
cellphone
AC Adapter
bq24316
IN
OUT
Charger
Accessory
powersupply
EN
DIS
Battery
pack
torestof
system
e.g.
cellphone
IN
OUT
ChargePump,
Bandgap,
BiasGen
Q1
V
OUT
bq24314
bq24316
SLUS763C – JULY 2007 – REVISED OCTOBER 2007
Figure 25. Charging - The Red Arrows Show the Direction of Current Flow
Figure 26. Powering an Accessory - The Red Arrows Show the Direction of Current Flow
In the second case, when power is being delivered to an accessory, the bq24314/bq24316 device is required to
support current flow from the OUT pin to the IN pin.
If V
OUT
> V
UVLO
+ 0.7V, FET Q1 is turned on, and the reverse current does not flow through the diode but through
Q1. Q1 will then remain ON as long as V
OUT
> V
UVLO
– V
HYS-UVLO
+ R
DS
ON*I
ACCESSORY
. Within this voltage range,
the reverse current capability is the same as the forward capability, 1.5A. It should be noted that there is no
overcurrent protection in this direction.
Figure 27.
14 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): bq24314 bq24316