BQ24705 Datasheet, PDF (14/30 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger With Low Input Power Detect

bq24705
SLUS779 – DECEMBER 2007
FUNCTIONAL BLOCK DIAGRAM
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0.6V ^-
+
ACDET
2.4V ^-
+
AC VGOOD
8 ms
Delay
Rising
ACGOOD
VREF
ACP
ACN
BAT
3.3V
LDO
ENA_BIAS
PVCC
EAI
EAO
+
V(ACP-ACN)
-
-
IIN_REG
+
10mA
CHRG_ON
-
VBAT_REG
+
FBO
IIN_ER
1V
BAT_ER
COMP
ERROR
AMPLIFIER
-
+
20 mA BAT_SHORT
700 ms
Delay
Rising
CHGEN
LEVEL
SHIFTER
CHGEN
PVCC
BTST
HIDRV
SRP
SRN
ISYNSET
ACSET
SRSET
VADJ
+
V(SRP-SRN)
20X
- ICH_ER
-
IBAT_ REG ₊
V(SRP - SRN) +
-
SYNCH
20 mA
BTST
BAT
–
+
2.9 V/Cell
+
-
BAT_SHORT
4 V ^+_
PH
IC Tj +
155°C
–
ACOP
SYNCH
REFRESH
-
C _BTST
+
TSHUT
DC-DC
CONVERTER
PWM LOGIC
VBATSET
IBATSET
VBAT_REG
BAT
+
BAT_OVP
IINSET
104% X VBAT_REG
IBAT_REG
–
RATIO
PROGRAM
IIN_REG
V(SRP-SRN)
+
CHG_OCP
VREF
145% X IBAT_REG
–
PVCC _{6V LDO}
ENA_BIAS
PH
REGN
LODRV
PGND
ACP
ACN
+ _V(IADAPT)
20x
-
IADAPT
CELLS
2, 3, 4
ACDET ⁺
–
3.1V
+
-
ACOV
PVCC –
+
4V
+
-
UVLO
DPM_LOOP_ON
DPMDET
AGND
14
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