BQ24721 Datasheet, PDF (23/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

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bq24721
SLUS683 – NOVEMBER 2005
VCC
5-V LDO
ENA
VREF5
ACDET
CHGEN
+
1.2 V
-
ADAPTER
DETECTED
BAT
-
SMBUS ₊
BATDEPSET
BATDEP
SYS
250 mV
-
+
BAT + 250 mV
SYS-BAT
SRP-BAT
ACOC
PVCC-6V _PVCC-6V PVCC
LDO
PVCC
EAO
EAI
FBO
ACP
ACN
BAT
SRP
SRN
SYNP
SYNN
ISYNSET
TS
(bq24721 only)
AGND
ACOC_SET ₊
-
ACOC
SYSTEM
POWER
SELECTOR
LOGIC
PVCC-6V
PVCC-6V
SYS-6V _{SYS 6-V} SYS
LDO
+
V(ACP-ACN)
-
-
IIN
+
DAC
-
250 mV
+
BAT + 250 mV
4 mA
OVP +
-
ACP-BAT
-
VBAT
+
DAC
110% x BAT_DAC
ICH_ER
BAT_ER
COMP
ERROR
AMPLIFIER
-
+
1V
SMBUS
CHGEN
20 mA
OVP
OCP
CHGEN
SYS-6V
LEVEL
SHIFTER
+
V(SRP-SRN)
-
IBAT
DAC
- ^ICH_ER
+
20 mA
SYNCH
ACP-BAT
DC-DC
CONVERTER
PWM LOGIC
SUSPEND
VCC
6-V LDO
2 x IBAT_DAC
-
+ V(SYNP-N)
+
-
+
ISYNSET x 500
-
OCP
SYNCH
1V
+
_
VREF5
+
-
-
+
+
-
+
-
TSDET
LTF
HTF
TCO
TSDET
BTST
-
+
4.5 V ⁺_
PH
REFRESH
CBTST
IC T_J
+
TSHUT
145^oC
-
SUSPEND
500 kHz 300 kHz
SW FREQ
SELECT
ACP
ACN
SRP
SRN
+
V(IADAPT)
20x
-
SELECT
+
V(IBAT)
20x
-
VBAT
DAC
IBAT
DAC
IIN (DPM)
DAC
CHARGE STATUS
REGISTER
CHARGE MODE
REGISTER
SMBus LOGIC
BYPASS
ACDRV
SYS
BATDRV
BTST
HIDRV
PH
REGN
LODRV
PGND
IOUT
ALARM
SDA
SCL
Figure 56. bq24721 Functional Block Diagram
23