BQ24700 Datasheet, PDF (4/29 Pages) Texas Instruments – NOTEBOOK PC BATTERY CHARGE CONTROLLER AND SELECTOR WITH DPM

bq24700, bq24701
NOTEBOOK PC BATTERY CHARGE CONTROLLER
AND SELECTOR WITH DPM
SLUS452B – APRIL 2001 – REVISED NOVEMBER 2002
block diagram
ACPRES 2
VHSP
20
VCC/2
VCC > 15 V
VCC
VREF
22
7
VREF = 5 V
0.5%
VOLTAGE
REFERENCE
HYST = 6%
ACDET 1
+
REF1 = 1.22 V
ACSEL 3
ACPRES
OSC
REF1 = 1.22 V
ACPRES
300 kHz
2V
+
SQ
RQ
REF2 = 1.25 V
0.5%
PWM
LOGIC
LEVEL
SHIFT
VCC
HIGH–SIDE
DRIVE
VHSP
ENABLE 8
COMP 10
ACP 12
ACN 11
ACSET 6
BATDEP 4
VS 18
ALARM 19
5V
100 µA
2 kΩ
+
VCC
+
ac
CURRENT
ERROR
AMPLIFIER
BATTERY
VOLTAGE
ERROR
AMPLIFIER 5 V
+
SRN
+
+
1.25 V
0.5%
2 kΩ
0.25 V
25 kΩ
0.8 x REF1
REF1=1.22 V +
BATP +
DEPLETED
BATTERY
COMPARATOR
SWITCH TO
BATTERY
BATTERY
CURRENT
ERROR
AMPLIFIER
+
NO BATTERY
COMPARATOR
+
50 kΩ
VCC
ADAPTER
SELECT
DRIVE
2
ACPRES
ACSEL
BATTERY SELECT
LOGIC
AND
ANTI–CROSS
CONDUCT
VHSP
VCC
BATTERY
SELECT
DRIVE
1
1 _{bq24700 ONLY}
ACDRV
ACSEL
SRP
SRN
SRN
VREF
+
A=20
2 _{bq24701 ONLY}
ą
21 PWM
13 BATP
9 BATSET
16 SRP
15 SRN
5 SRSET
24 ACDRV
23 BATDRV
17 GND
14 IBAT
UDG–00137
4
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265