BQ24751RHDRG4 Datasheet, PDF (26/38 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger

bq24751
SLUS734D – DECEMBER 2006 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
Vadapter
ACDET
0V
700ms delay after
ACDET, before allow
ACDRV to turn-on
700ms
Vin
In all cases, after 700ms
delay, have input over-
current protection,
ACOC, by linearly limiting
input current.
Threshold is equal to the
lower of Idpm*1.5, or
10A.
ACOC, with ACOP Latch-off,
Latch-off time accumulates
only when in current limit
regulation, ACOC. The time
before latch-off is
programmable with Cacop,
and is inversely proportional to
source-drain voltage of
ACFET (power). Cacop
charge/discharge per time
also provides memory for
power averaging over time.
2ms
8ms
Allow Charge to Turn-on
After Latch-Off, Latch
can only clear by:
1) bringing ACDET below
2.4V, then above 2. 4V; or
2) bringing PVCC below
UVLO, then above
UVLO.
ACGOOD
Vadapter
Vbattery
Ilim = 1.5xIdpm
(100 mV max
Across ACP_ACN)
BATDRV
ACDRV
Vsystem
Input Current
Allow Charge
Charge Current
V (ACOP)
A. ACFET overpower protection; initial current limit allows safe soft-start without system voltage droop.
Figure 34. ACOC Protection During Adapter Insertion
26
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