Datasheet

MAX1997/MAX1998
Quintuple/Triple-Output TFT LCD Power Supplies
with Fault Protection and VCOM Buffer
______________________________________________________________________________________ 13
Figure 1. Standard Application Circuit
V
IN
2.7V TO 5.5V
L1
3.0µH
P1
R2
51.1kΩ
C2
10µF
6.3V
R1
10Ω
Q1
V
LOGIC
2.5V
C7
1000pF
C8
100pF
C1
0.47µF
R5
150kΩ
R3
150kΩ
R88
12.4kΩ
R99
12.4kΩ
R77
510Ω
R4
43.2kΩ
C12
1µF
C13
10µF
C18
0.1µF
ANALOG GROUND
(GND)
POWER GROUND
(PGND)
GATE
OCN
LX
FB
OCP
IN
SHDN
FREQ
DRV1
FB1
20
23
25
27
26
29
32
D1
V
MAIN
9V
LX
31
3
4
R15
6.8kΩ
R18
6.8kΩ
R11
118kΩ
R12
20kΩ
R10
2.2kΩ
R7
7.68kΩ
R9
1MΩ
R8
1.21kΩ
R6
100kΩ
R16
150kΩ
R17
24.3kΩ
R21
39kΩ
R20
20kΩ
R14
20kΩ
R13
20kΩ
R19
301kΩ
R22
39kΩ
R23
39kΩ
D5
DRVP
FBP
Q3
LX
22
21
D3
D4
DRV2
FB2
Q2
V
G_OFF
-7V
V
G_ON
20V
19
18
ONDC
30
PFLT
28
ON2
ONP
ONN
FBNB
OUTB
FBPB
V
DDB
16
17
14
15
8
7
6
DRVA
11
N1
TGNDA
TGNDB
24
1
DRVN
FBN
LX
Q4
D2
9
10
C27
1000pF
V
SOURCE
9V
CT
REF
GND
REF
D6
REF
5
12
13
V
VCOM
PGND
2
V
GAMMA
8.6V
C17
0.22µF
C16
0.1µF
C20
0.47µF
C26
1µF
C19
0.1µF
C24
0.1µF
C25
0.1µF
C22
0.1µF
C14
2.2µF
C15
1µF
C11
0.47µF
C9
0.01µF
C4
4.7µF
10V
C5
4.7µF
10V
C6
4.7µF
10V
C23
0.1µF
MAX1997
R24
150kΩ
C28
1000pF