BQ24650 Datasheet, PDF (11/33 Pages) Texas Instruments – Synchronous Switch-Mode Battery Charge Controller for Solar Power With Maximum Power Point Tracking

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BLOCK DIAGRAM
SLUSA75 – JULY 2010
VREF
3.3V
LDO
VCC
VREF
VOLTAGE
REFERENCE
SLEEP
UVLO
VCC
-
SRN+100 mV
+
VCC
-
VUVLO
+
SLEEP
UVLO
bq24650
VCC
175 mV -
+
FBO
MPPSET
VFB
SRP
SRN
-
1.2 V +
+
2.1 V
-
+
20X
V(SRP-SRN)
+
-
0.8V -
FAULT
COMP
ERROR
AMPLIFIER
EAI -
+
1V
EAO
+
-
CE
PWM
20uA
20 uA
BAT _OVP
SRP-SRN
5 mV
+
-
BTST
PH ^_ +
4V
+
SYNCH
-
- REFRESH
+
PWM
CONTROL
LOGIC
2 mA
8 mA
CHARGE
DISCHARGE
TERM_EN
0.8V
0.8V
10
V(SRP-SRN)
-
200% X IBAT_REG +
CHG_OCP
30 Minute
Precharge
Timer
IC Tj +
145°C ^-
FAULT
TSHUT
IBAT_ REG
VFB
-
BAT _OVP
104% X 2.1V
+
STATE
MACHINE
LOGIC
CHARGE
STAT1
STAT2
VFB _-
+
1.5V
+
-
LOWV
VFB -
+
2.05V
+
-
RCHRG
V(SRP - SRN) +
0.8V
-
10
VCC +
-
32V
+
-
TERM
LOWV
BATTERY
DETECTION
LOGIC
DISCHARGE
ACOV
LTF
SUSPEND
HTF
RCHRG
TERM
TERMINATE CHARGE
TCO
LEVEL
SHIFTER
VCC
6V LDO
CE
VREF
-
+
+
-
+
-
BTST
HIDRV
PH
REGN
LODRV
GND
STAT 1
STAT 2
TS
Figure 15. Functional Block Diagram
Copyright © 2010, Texas Instruments Incorporated
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