BQ24600_1 Datasheet, PDF (9/31 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger with Low Iq

bq24600
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BLOCK DIAGRAM
SLUS891 – FEBRUARY 2010
bq24600
CE
1M
VCC
-
SRN+100mV
+
VCC
-
VUVLO
+
SLEEP
UVLO
3.3V
LDO
VREF
INTERNAL
REFERENCE
VFB
SRP
SRN
COMP
ERROR
AMPLIFIER
-
+
1V
CE
PWM
2.1 V
BAT _OVP
+
20xV(SRP-SRN)
20X
-
IBAT_ REG
20uA
20μA
SRP-SRN
5 mV
+
-
BTST
PH ^_ +
+
SYNCH
-
- REFRESH
+
PWM
CONTROL
LOGIC
2mA
FAULT
V(SRP-SRN)
160% X IBAT_REG
4.2V
CHG_OCP
CHARGE
LEVEL
SHIFTER
VCC
CE
6V LDO
ENA_BIAS
8mA
CHARGE
DISCHARGE
ISET
ISET
ISET
10
Safety Timer ^FAULT
IC Tj +
145degC ^-
BAT
104% X VBAT_REG
IBAT_ REG
VFB _-
+
1.55V
+
-
LOWV
VFB -
+
2.05 V
+
-
RCHRG
bq24600
20xV(SRP-SRN)
ISET
10
VCC +
-
VACOV
+
-
TERM
TSHUT
BAT _OVP
STATE
MACHINE
LOGIC
STAT
PG
LOWV
ACOV
BATTERY
DETECTION
LOGIC
DISCHARGE
LTF
SUSPEND
HTF
RCHRG
TERM
TERMINATE CHARGE
TCO
VREF
-
+
+
-
+
-
Figure 11. Functional Block Diagram for bq24600
VCC
VREF
BTST
HIDRV
PH
REGN
LODRV
GND
STAT
PG
TS
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