Rainbow Electronics MAX1802 - Manual (Page 15)

MAX1802
Digital Camera Step-Down
Power Supply
______________________________________________________________________________________ 15
OSC
4
5
VL
VL
REF
REF OSC
GND
DCON1 DCON2 DCON3 DL3
20
DL1
D1 D2 D3 D4
Q3
Q4 Q5
D
6
Q2
DL2 FB1
12 15
FB2
19 16
DHM LXM DLM
PGNDM
FBM
VDDC
LXC FBC
FB3 VL
28 22 23 18 11 31 10 24 13
3 2
29 14 17 21
ONC ON1 ONM COMPM COMPC COMP1 COMP2 COMP3
VH
VDDM
PGND
25
32
0.1
µ
F
1µ
F
0.1
µ
H
1µ
F
10
µ
H
10
µ
H
100
µ
F
10
µ
F
1µ
F
1µ
F 1µ
F
1µ
F
4.7
µ
H
4.7
µ
F
464k 100k
100pF
40.2k
10
µ
F
DCON
D5
Q1
GND
IN
COMP DL
MAX1802
OFF
ON
6 7 8 9 1 27 26 30
CORE MAIN
+12V
+3.3V +1.8V
LCD BIAS +18V -7.5V CCD BIAS +15V
100k
100k
100k
100k
165k
44.2k
1.34
M
Ω
MAX1801
C
C3
1000pF
C
C2
1000pF
C
C1
1000pF
C
CC
470pF
C
CM
4.7nF R
CM
33k
R
CC
90k
R
C1
10k
R
C2
10k
R
C3
10k
2
4 3 1
7
5 6 8
C
OSC
R
OSC
INPUT
2.5V TO 11V
+5V
MOTOR DRIVE
+7V
BACKLIGHT
Q
1
, Q
2
, Q
3
: FDN337N
Q
4
, Q
5
: SEE
MOSFET SELECTION
SECTION
D
1
, D
2
, D
3
, D
4
: CMSD-4448
D
5
: MBR0502L
1.1M
Ω
0.1
µ
F
Figure 1. Typical Application Circuit