BQ24740_14 Datasheet, PDF (16/33 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger

bq24740
SLUS736C – DECEMBER 2006 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
FUNCTIONAL BLOCK DIAGRAM
0.6 V ^-
+
ACDET
ENA_BIAS_CMP
2.4 V ^-
+
AC_VGOOD
700 ms
Rising
Delay
AC_VGOOD_DG
EXTPWR
VREFGOOD
VREF
IADSLP
3.3 V ENA_BIAS
LDO
UVLO
IADSLP
V(IADAPT) ₊
-
250
mV
+
-
AC_IGOOD
EAI
EAO
ACP
FBO
+ _V(ACP-ACN)
20x
- IIN_ER
-
IIN_REG
+
ACN
COMP
ERROR
AMPLIFIER
AC_VGOOD_DG
CHGEN
BAT
- BAT_ER
VBAT _REG
+
SRP
3.5 mA
+ V(SRP-SRN)
20x
- ^ICH_ER
–
IBAT_REG +
SRN
3.5 mA
-
+
1V
20 µA
DC-DC
CONVERTER
PWM LOGIC
LEVEL
SHIFTER
CHRG_ON
20 µA
SYNCH
PVCC_BAT
PVCC _{6 V LDO}
VREFGOOD
CHGEN
PVCC
BTST
HIDRV
PH
REGN
ISYNSET
ACSET
SRSET
VADJ
VDAC
CELLS
LPREF
LPMD
V(SRP-SRN) + _SYNCH
-
BTST _-
+
4 V ^+_
PH
REFRESH
CBTST
IC Tj + TSHUT
155°C ^-
VBATSET
IBATSET
VBAT _REG
104% X VBAT_REG
-
BAT_OVP
IINSET _{IBAT_REG}
BAT ⁺
RATIO
PROGRAM
IIN_REG
145% X IBAT_REG -
V(SRP-SRN) +
CHG_OCP
V(IADAPT) +
-
ACDET +
-
3.1 V
+
-
ACOV
PVCC -
+
4V
+
-
UVLO
PVCC +
BAT – + ^–
185 mV
LODRV
PGND
ACP _{+ V(IADAPT)}
20x
IADAPT
ACN -
DPM_LOOP_ON
DPMDET
PVCC_BAT
AGND
PGND
bq24740
16
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