Rainbow Electronics MAX8758 - Manual (Page 10)

MAX8758
Typical Operating Circuit
The typical operating circuit ( Figure 1) of the MAX8758
is a power-supply solution for TFT LCD panels in note-
book computers. The circuit generates a +8.5V source
driver supply, and approximately +22V and -7V gate
driver supplies. The input voltage range for the IC is
from +1.8V to +5.5V, but the
Figure 1 circuit is
designed to run from 2.7V to 3.6V. Table 1 lists some
selected components and Table 2 lists the contact
information of component suppliers.
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
10 ______________________________________________________________________________________
MAX8758
V MAIN
+8.5V/300mA
TO VCOM
BACKPLANE
V GON
+24V/20mA
FROM TCON
V IN
+1.8V TO +5.5V
V GOFF
-8V/20mA
IN
FREQ
SHDN
COMP
LDO
FB
LX
GND
PGND
OUT
SUPB
GON
DRN
CTL
MODE
SS
POSB
NEGB
OUTB
THR
DLP
SRC
C15
0.1µF
C1
3.3µF
6.3V
C2
3.3µF
6.3V
R4
10Ω
C6
1µF
R10
100kΩ
R3
100kΩ
C7
220pF
C8
33pF
C9
0.22µF
C10
0.022µF
C11
150pF
R9
20kΩ
D2 D3
D4
C3
4.7µF
10V C4
4.7µF
10V C5
4.7µF
10V
L1
4.7µH
C6
0.1µF
C17
0.1µF
C19
0.1µF
C18
0.1µF
R1
200kΩ
1%
R2
34.0kΩ
1%
C12
0.1µF
R5
100kΩ
R6
100kΩ
R8
20.0kΩ
1%
R7
51.1kΩ
1%
C13
0.033µF
C14
0.1µF
D1
Figure 1. Typical Operating Circuit