Rainbow Electronics MAX1779 - Manual (Page 11)

MAX1779
Low-Power Triple-Output TFT LCD DC-DC
Converter
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GND PGND
R6
C REF
0.22 µF
V SUPN = 2.7V TO 13V
SUPN
OSC
R5 V
NEG
C5
C6
D5
D4
+
-
DRVN
FBN
REF
MAX1779
+
- V REF
1.25V
V NEG = - V REF
V REF = 1.25V
R5
R6
( )
Figure 2. Negative Charge-Pump Block Diagram
GND PGND
V REF
1.25V
R4
V SUPP = 2.7V TO 13V
SUPP
OSC
R3 V POS
C3
C4
D3
D2
+
-
DRVP
FBP
MAX1779
+
-
V POS = 1 + V
REF
V REF = 1.25V
R3
R4
( )
Figure 3. Positive Charge-Pump Block Diagram