BQ24751RHDRG4 Datasheet, PDF (18/38 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger

bq24751
SLUS734D – DECEMBER 2006 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
FUNCTIONAL BLOCK DIAGRAM
ACDET
ACOP
CHGEN
VREF
0.6 V ^-
+
ENA_BIAS
2.4 V ^-
+
VREF
ENA_SRC
Isrc=K*V(PVCC-ACP)
K=18 µA/V
ENA_SNK
+
ACOPDET
-
5 µA
2V
+
-
ACDET
PVCC_UVLO
ADAPTER DETECTED
PVCC
+
BAT
-
185 mV
ACOP_LATCH
S
Q
RQ
ENA_BIAS
3.3 V
LDO
PVCC
EAI
700 ms
Delay
Rising
PVCC- BAT
SYSTEM
POWER
SELECTOR
LOGIC
EAO
PVCC-6V _PVCC-6V
LDO
ENA_BIAS
PVCC
PVCC-6V
ACN
ACN-6V
ACGOOD
PVCC
ACDRV
BATDRV
ACP
ACN
BAT
SRP
SRN
ACSET
SRSET
VADJ
+
20x
-
V(ACP-ACN)
-
IIN_REG ₊
-
+
285 mV
V(ACN-BAT)
-
VBAT_REG ₊
3.5 mA
+
20x
–
V(SRP-SRN)
-
IBAT_ REG ₊
3.5 mA
FBO
IIN_ER
BAT_ER
COMP
ERROR
AMPLIFIER
-
+
1V
BAT_OVP
20uA
CHG_OCP
ACOV
ACOP
ICH_ER
20 µA
V(ACN-BAT)
BAT_SHORT
UVLO
ACLOWV
SYNCH
ACFET_ON
CHGEN
LEVEL
SHIFTER
DC-DC
CONVERTER
PWM LOGIC
PVCC _{6V LDO}
ENA_BIAS
CHRG_ON
V(SRP - SRN) +
-
13 mV
+
-
SYNCH
BTST
-
+
4 V ^+_
PH
REFRESH
CBTST
IC Tj
+
TSHUT
155°C
-
VBATSET
IBATSET
BAT
VBAT_REG
104% X VBAT_REG
+
-
BAT_OVP
IINSET _{IBAT_REG}
RATIO
PROGRAM
IIN_REG
V(SRP-SRN)
+
CHG_OCP
145% X IBAT_REG
-
ACP
ACN
+
V(IADAPT)
20x
-
LEARN
BTST
HIDRV
PH
REGN
LODRV
PGND
IADAPT
VDAC
OVPSET
CELLS
AGND
+
-
3.1 V
+
-
ACOV
PVCC -
+
4V
+
-
UVLO
BAT
–
+
2.9 V/cell
+
–
BAT_SHORT
bq24751
18
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