ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢂ ꢆ ꢀꢁ ꢂꢃ ꢄꢅ ꢇ
SLUS553D − MAY 2003 − REVISED JULY 2005
BLOCK DIAGRAM
VHSP
20
VCC
22
VREF
7
VREF
VHSP
VOLTAGE
REGULATOR
REFERENCE
ACPRES
ACDET
2
1
ACPRES
ACPRES
300 kHz
HYST
VCC
+
S
R
Q
Q
2 V
PWM
LOGIC
LEVEL
SHIFT
HIGH−SIDE
DRIVE
21
PWM
V
OSC
ACPRES
+
VHSP
ACSEL
3
8
5 V
ENABLE
µ
100
A
BATDA
VTBD
+
BATTERY
Zero Volt
Charging
VOLTAGE
ERROR
13
9
BATP
AMPLIFIER
5 V
+
COMP
ACP
10
12
11
6
BATSET
VCC
Ω
2 k
0.25 V
+
+
V
FB
ACN
ac
SRN
CURRENT
ERROR
Ω
2 k
ACSET
16
15
5
SRP
+
+
AMPLIFIER
SRN
BATTERY
+
CURRENT
ERROR
SRSET
25
AMPLIFIER
VCC
Ω
k
+
0.8 x V
NOBAT
25
ADAPTER
SELECT
DRIVE
Ω
k
NO BATTERY
24
ACDRV
V
+
BATDEP
COMPARATOR
BATDEP
4
DEPLETED
BATTERY
VHSP
2
COMPARATOR
VCC
BATTERY SELECT
LOGIC
BATP
+
BATTERY
SELECT
DRIVE
VS
18
19
AND
23
17
BATDRV
GND
SWITCH TO
BATTERY
ACPRES
ANTI−CROSS
CONDUCT
ALARM
ACSEL
ACDRV
VCC
1
SRP
+
ACSEL
SRN
A=20
14
IBAT
1
2
bq24702 ONLY
bq24703 ONLY
UDG−00137
11
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