BQ24640 Datasheet, PDF (11/25 Pages) Texas Instruments – High-Efficiency Synchronous Switch-Mode Super Capacitor Charger

bq24640
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BLOCK DIAGRAM
SLUSA44 – MARCH 2010
VREF
3.3V
LDO
VCC
VREF
VOLTAGE
REFERENCE
SLEEP
UVLO
VCC
-
SRN+100mV
+
VCC
-
VUVLO
+
SLEEP
UVLO
CE
1M
FBO
VFB
SRP
SRN
+
VREG -
+
20X
V(SRP-SRN)
+
-
-
CHARGE
COMP
ERROR
AMPLIFIER
EAI
-
+
1V
EAO
-
+
CE
PWM
20uA
20uA
OUT_OVP
SRP-SRN
+
5 mV -
BTST
PH ^_ +
4V
+
SYNCH
-
- REFRESH
+
PWM
CONTROL
LOGIC
8mA
V(SRP-SRN)
-
160% X ISET +
CHG_OCP
ISET
IC Tj +
145 degC
-
TSHUT
CHARGE
STAT
VFB _-
OUT_OVP
STATE
PG
104% X VREG +
MACHINE
LOGIC
VCC +
-
ACOV
VACOV
+
-
LTF
SUSPEND
HTF
TCO
bq24640
LEVEL
SHIFTER
VCC
6V LDO
CE
VREF
-
+
+
-
+
-
VCC
BTST
HIDRV
PH
REGN
LODRV
GND
STAT
PG
TS
Figure 9. Functional Block Diagram
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