BQ24702_16 Datasheet, PDF (11/37 Pages) Texas Instruments – MULTICHEMISTRY BATTERY CHARGER CONTROLLER

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