BQ24742 Datasheet, PDF (16/35 Pages) Texas Instruments – Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge

bq24741, bq24742
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
FUNCTIONAL BLOCK DIAGRAM
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ACDET
0.6V ^-
+
ENA_BIAS_CMP
2.4V ^-
+
AC_VGOOD
ACGOOD
EXTPWR
VREF
VREFGOOD
3.3V
LDO
ENA_BIAS
PVCC
UVLO
ACP
ACN
+
20X
-
VAC20X
+
IIN_REG _-
FBO
IIN_ER
VAC20X
250mV
+
-
EAI
EAO
COMP
ERROR
AMPLIFIER
-
+
- _{AC_IGOOD}
PVCC-BAT
1 MΩ
CE
+
-
BAT
900mV
BAT
CSP
CSN
TRICKLE
FSET
+ BAT_ER
VBAT_REG
-
3.5 mA
+
VSR20X
20X
+ ICH_ER
-
-
3.5 mA
CHRG_ON
IBAT_ REG
60mV
1 MΩ
OSC
CLK
+
1V
20 µA
20 µA
BAT_SHORT
PVCC-BAT
SYNCH
AC_VGOOD
CLK
DC-DC
CONVERTER
PWM LOGIC
BTST
-
+
4V ^+_
SW
REFRESH
CBTST
LEVEL
SHIFTER
PVCC _{6V LDO}
VREFGOOD
CE
ACSET
SRSET
VADJ
VDAC
CELLS
LPREF
LPMOD
IC Tj +
155 °C
-
TSHUT
VBATSET
IBATSET
VBAT_REG
104% X VBAT_REG
-
BAT_OVP
IINSET _{IBAT_REG}
BAT
+
RATIO
PROGRAM
IIN_REG
2.08 V / 2.5 V
-
CHG_OCP
VSR20X
+
VAC20X +
-
ACDET +
-
3.1V
+
-
ACOV
PVCC -
+
8V
+
-
UVLO
VAC20X
+
V(IADAPT)
-
DPM_LOOP_ON
VSR20X +
30mV -
SYNCH
1.7 V ⁺
BAT ^-
BAT_SHORT
bq24741/2
PVCC
CE
BTST
HIDRV
SW
REGN
LODRV
PGND
IADAPT
DPMDET
AGND
PGND
16
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