BQ24704 Datasheet, PDF (14/31 Pages) Texas Instruments – Low Cost, Host-Controlled Li-Ion and Li-Polymer Battery Charger With Low Iq

bq24704
SLUS838 – MAY 2009........................................................................................................................................................................................................ www.ti.com
FUNCTIONAL BLOCK DIAGRAM
0.6 V
–
+
ACDET
VREF
3.3V
LDO
ENA_BIAS
PVCC
ACP
ACN
+
16x
–
V(ACP-ACN)
IIN_REG
BAT
VBAT_REG
2.4 V ^–
+
AC_VGOOD
Delay
1.2 s Rising
10 μs Falling
EAI
EAO
FBO
– IIN_ER
+
– BAT_ER
+
COMP
ERROR
AMPLIFIER
–
1V
+
CHGEN
LEVEL
SHIFTER
ACGOOD
CHGEN
PVCC
BTST
HIDRV
SRP
SRN
ISYNSET
ACSET
SRSET
VADJ
3.5 mA
+ V(SRP-SRN)
20x
–
IBAT_REG
3.5 mA
ICH_ER
–
+
20 mA
20 mA
SYNCH
DC-DC
CONVERTER
PWM LOGIC
PVCC _{6V LDO}
CHRG_ON
ENA_BIAS
V(SRP-SRN)
+
SYNCH
–
BTST
–
+
4 V ^_+
PH
REFRESH
C_BTST
IC Tj
+
TSHUT
155°C
–
VBATSET
IBATSET
VBAT_REG
104% X VBAT_REG
–
BAT_OVP
IINSET
IBAT_REG
BAT
+
RATIO
PROGRAM
IIN_REG
VREF
145% X IBAT_REG
–
V(SRP-SRN) +
CHG_OCP
ACP
ACN
+ _V(IADAPT)
16x
–
DPM_LOOP_ON
PH
REGN
LODRV
PGND
IADAPT
DPMDET
CELLS
PVCC _–
BAT – + +
185 mV
PVCC_BAT
AGND
PGND
bq24704
14
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