Datasheet

www.ti.com
UDG-00137
20
VHSP
VHSP
REGULATOR
22
VCC
7
VREF
VOLTAGE
REFERENCE
VREF
ACPRES
2ACPRES
+
1ACDET
ACPRES
HYST
LEVEL
SHIFT
S Q
QR
PWM
LOGIC
OSC
21
HIGH-SIDE
DRIVE
300 kHz
+
3ACSEL
8ENABLE
VCC
VHSP
10COMP
5 V
100
µ
A
+
+
5 V
SRN
+
2 k
Ω
12ACP
11ACN
+
6ACSET
25
k
Ω
VCC
ac
CURRENT
ERROR
AMPLIFIER
BATTERY
CURRENT
ERROR
AMPLIFIER
BATTERY
VOLTAGE
ERROR
AMPLIFIER
+
13
PWM
BATP
9 BATSET
16 SRP
2 k
Ω
15 SRN
5 SRSET
25
k
Ω
0.25 V
BATTERY
SELECT
DRIVE
ADAPTER
SELECT
DRIVE
+
24
VCC
VHSP
VCC
23 BATDRV
BATTERY SELECT
LOGIC
AND
ANTI-CROSS
CONDUCT
+
NO BATTERY
COMPARATOR
17 GND
+
A=20
VCC
14 IBAT
SRP
SRN
ACSEL
ACPRES
+
SWITCH TO
BATTERY
4BATDEP
+
DEPLETED
BATTERY
COMPARATOR
BATP
18VS
2
2
1
1
ACDRV
ACDRV
ACSEL
bq24702 ONLY
bq24703 ONLY
19ALARM
2 V
+
BATDA
VTBD
Zero Volt
Charging
V
ACPRES
V
FB
0.8 x V
NOBAT
V
BATDEP
bq24702
bq24703
SLUS553E – MAY 2003 – REVISED OCTOBER 2007
BLOCK DIAGRAM
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Product Folder Link(s): bq24702 bq24703