13 Others
13.1. Description of Major ICs (1)
IC903
C1ZBZ0004521
CHANGE PUMP CONTROLLER
VIN
6
GND
3
CTRL_A
4
LOGIC
CTRL_B
CONTROL
5
Pin
Label
I/O
1
VSP
O
Positive terminal of the output
2
VSN
O
Negative terminal of the output
3
GND
-
GND
4
CTRL_A
I
Control signal 1, this signal should be low when no pump.
5
CTRL_B
I
Control signal 2, this signal should be low when no pump.
6
VIN
I
Power supply
7
C1N
O
Negative terminal of the charge-pump transfer capacitor 1 (1.0uF/10V)
8
C1P
O
Positive terminal of the charge-pump transfer capacitor 1 (1.0uF/10V)
9
C2N
O
Negative terminal of the charge-pump transfer capacitor 2 (1.0uF/10V)
10
C2P
O
Positive terminal of the charge-pump transfer capacitor 2 (1.0uF/10V)
11
C3N
O
Negative terminal of the charge-pump transfer capacitor 3 (1.0uF/10V)
12
C3P
O
Positive terminal of the charge-pump transfer capacitor 3 (1.0uF/10V)
IC4703
IC4706
C0JBAR000432
Signal Selector IC
VSN
2
C3P
CHARGE-PUMP
12
VSN
C3N
11
VSP
1
C2P
10
C2N
CHARGE-PUMP
9
VSP
C1P
8
C1N
7
Description
IC4708
C0DBGYY01912
REGULATOR
VIN
3
CURRENT
LIMIT
VOLTAGE
REFERENCE
Pin
Label
I/O
1
VOUT
O
Regulated voltage output
2
VSS
-
Ground
3
VIN
I
Supply voltage input
IC4701
IC4702
IC4704
IC4705
IC4806
C0ABBB000220
COMPARATOR
A OUTPUT
V +
1
A
A -INPUT
B OUTPUT
-
+
2
A +INPUT
B
B -INPUT
+
-
3
B +INPUT
V -
4
54
VOUT
1
RA
+
-
RB
VSS
2
Description
IC4801
IC4802
IC4803
IC4804
C0ABBB000369
COMPARATOR
A OUTPUT
V +
8
1
A
A -INPUT
B OUTPUT
-
+
7
2
A +INPUT
B -INPUT
+ -
6
3
B +INPUT
V -
5
4
IC4805
8
7
6
5