BQ24314EVM Datasheet, PDF (14/26 Pages) Texas Instruments – OVERVOLTAGE AND OVERCURRENT PROTECTION IC

bq24314
bq24316
SLUS763C – JULY 2007 – REVISED OCTOBER 2007
AC Adapter
IN OUT
bq24316
www.ti.com
Accessory
DIS
power supply
Charger
EN
Battery
pack
e.g.
cellphone
to rest of
system
Figure 25. Charging - The Red Arrows Show the Direction of Current Flow
IN OUT
bq24316
Accessory
EN
power supply
Charger
DIS
Battery
pack
e.g.
cellphone
to rest of
system
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_DSON*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.
IN
Charge Pump,
Bandgap,
Bias Gen
Q1 ^OUT
V_OUT
Figure 27.
14
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