Datasheet

Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide
DS70336A-page 56 © 2008 Microchip Technology Inc.
FIGURE 1-4: DAUGHTER BOARD SCHEMATIC 3 OF 5
VOUT3
20V/0.75A
Stage 3 Boost
D
G
S
9VANA_GND
9VANA_GND
L5
22uH
9VANA_GND
C28
0.1uF
C5
0.47nF
Q14
FDT459N
C24
0.1uF
C25
R52
22R 1% 1/8W
D9
BAS16
+9V
R53
0.5R
R54
1k
C26
4.7uF 25V
C27
220uF 25V Elec
J8
R55
20k 1% 1/8W
R56
3.3k
D13
LED_0805
R59
10k
9VANA_GND
D10
Schottky
TP12
Boost+
TP13
GND
R13
20k 1% 1/8W
R14
2.2k 1% 1/8W
C20
2.2nF 25V
R15
5.1k
+3.3V_DIG
9VANA_GND
Q4
BSR14_SOT23
9VANA_GND
Voltage FB Boost
U3
TC1428COA
R34
3.3K
+3.3V_DIG
PWM3H
INB
Voltage FB2
Current Sense
3
INA
NC
V
SS
NC
OUTA
VDD
OUTB
A
A
A
A
A
B
B
B
B
B
A
B
R54
A
B
A
B
VIN
A
B
A
B
A
B
B
A
0.1uF
C4
J15
A
B
A
B
A
B
8 7
5
6
Current Sense2
J14