User guide

MAX1748
Triple-Output TFT LCD DC-DC Converter
14 ______________________________________________________________________________________
C
INTG
470pF
C
REF
0.22µF
R4 49.9k
R3
1M
0.22µF
6.8µH
0.1µF
1.0µF
0.47µF
V
MAIN
= +18V, 140mA
V
NEG
= -8V, 20mA
R5
319k
R6
49.9k
V
IN
= 5.0V
SUPN SHDN RDY
V
POS
=
+25V, 5mA
R2 10k
R1 130k
R
COMP
5k
C
COMP
68nF
C
OUT
10µF
IN SUPP
LX FB
DRVP
FBP
INTG
TGND
GND
FBN REF PGND
MAX1748
0.22µF
0.1µF
0.47µF
3.3µF
100k
DRVN
1.0µF
Figure 4. Power Supply Using Cascoded MOSFET