BQ24630 Datasheet, PDF (12/33 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with System Power Selector and Low Iq

bq24630
SLUS894 – JANUARY 2010
BLOCK DIAGRAM
VREF
CE
ACP
ACN
ACSET
VFB
SRP
SRN
TTC
ISET1
ISET2
ACN
VCC- 6 V ^{ACN -6 V}
REG
VREF
VOLTAGE
REFERENCE
3.3 V
LDO
VCC
SLEEP
UVLO
VCC
-
SRN+100 mV
+
VCC
-
VUVLO
+
ACN +
SRN+200 mV -
bq24630
SLEEP
UVLO
ACN - SRN
SYSTEM
POWER
SELECTOR
LOGIC
ACOV
VCC- 6 V VCC- 6 V
REG
VCC
VCC- 6 V
ACN
+ _V(ACP-ACN)
20X
-
1.8 V
1M
COMP
ERROR
AMPLIFIER
-
+
1V
CE
PWM
BAT_OVP
ACN - 6 V
LEVEL
SHIFTER
+
20X
V(SRP-SRN)
-
IBAT_ REG
DISCHARGE
OR
CHARGE
8 mA 2 mA
FAULT
V(SRP-SRN)
160% X IBAT_REG
Safety Timer ^FAULT
20 mA _{SRP- SRN}
5mV ^+-
20 mA
BTST
PH ^_ +
4.2V
-
CHG_OCP
+
+
SYNCH
-
- ^REFRESH
+
PWM
CONTROL
LOGIC
VCC
CE
6 V LDO
30 minute
TTC _Precharge
timer
ISET1
8
IC Tj + TSHUT
145 °C
-
ISET1
1.25 mV
IBAT_ REG
BAT
108% X VBAT_REG
BAT_OVP
STATE
MACHINE
LOGIC
CHARGE
STAT1
STAT2
PG
DISCHARGE
LTF
VREF
-
+
VFB
0.35V
+
-
VFB
1.675V ^+-
-
LOWV
+
COOL
WARM
-
RCHRG
+
100X V(SRP -SRN)
bq24630
ISET2
TTC -
0.4 V +
VCC +
-
VACOV ^+-
TERM
DISABLE
TMR/TERM
BATTERY
DETECTION
LOGIC
COOL ^-
+
ACOV
SUSPEND
WARM +
-
HTF
+
-
RCHRG
TERM
TCO
+
-
TERMINATE CHARGE
Figure 16. Functional Block Diagram of bq24630
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VCC
ACDRV
BATDRV
BTST
HIDRV
PH
REGN
LODRV
GND
STAT1
STAT2
PG
TS
12
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