PDP-427XD
205
5
6
7
8
5
6
7
8
C
D
F
A
B
E
• Regulator IC
LTC3412EFE (MAIN ASSY: IC4103)
Block Diagram
Pin Arrangement (Top view)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SVIN
PGOOD
ITH
VFB
RT
SYNC/MODE
SGND
PVIN
PGND
SW
PVIN
SW
SW
PGND
SW
RUN/SS
1
4
2
7
5
8
3
9
16
OSCILLATOR
LOGIC
6
0.74V
0.86V
RUN
15
14
11
10
SGND
BCLAMP
RUN/SS
PGOOD
SYNC/MODE
PGND
PGND
SW
SW
SW
SW
13
12
SYNC/MODE
+
V
0.8V
SVIN
ITH
VOLTAGE
REFERENCE
SLOPE
COMPENSATION
RECOVERY
PMOS CURRENT
COMPARATOR
SLOPE
COMPENSATION
BURST
COMPARATOR
ERROR
AMPLIFIER
VFB
NMOS CURRENT
COMPARATOR
P-CH
N-CH
REVERSE
CURRENT
COMPARTOR
PVIN PVIN
RT
Pin Function
−
−
−
−
−
−
No.
Pin Name
I/O
Pin Function
No.
Pin Name
I/O
Pin Function
1
SVIN
I
Signal Input Supply.
9
PVIN
I
Power Input Supply
2
PGOOD
O
Power Good Output.
10
SW
Switch Node Connection to the Inductor.
3
ITH
−
Error Amplifier Compensation Point.
11
SW
Switch Node Connection to the Inductor.
4
VFB
I
Feedback Pin.
12
PGND
Power Ground
5
RT
I
Oscillator Resistor Input.
13
PGND
Power Ground
6
SYNC/MODE
I
Mode Select and External Clock
Synchronization Input.
14
SW:
Switch Node Connection to the
Inductor.
7
RUN/SS
I
Run Control and Soft-Start Input.
15
SW
Switch Node Connection to the Inductor.
8
SGND
−
Signal Ground.
16
PVIN
I
Power Input Supply