Rainbow Electronics MAX1697 - Manual (Page 10)

MAX1697
60mA, SOT23 Inverting Charge Pump
with Shutdown
10 ______________________________________________________________________________________
MAX1697
2
5
1
V
OUT
= (2V
IN
) -
(V FD1 ) - (V FD2 )
C2
+V
IN
C1
3
4
6
V OUT = -V IN
C4
D1
D1, D2 = 1N4148
C3
D2
SHDN
Figure 6. Combined Doubler and Inverter
MAX1697
4
1
GND
OUT
V+
R L
Figure 7. Heavy Load Connected to a Positive Supply
TRANSISTOR COUNT: 275
MAX1697 MAX1697
2
1 V OUT
C2
2
+V IN
C1 C1
3 3
4 4
6
5 5
6 1
V OUT = -V IN
R OUT =
R OUT OF SINGLE DEVICE
NUMBER OF DEVICES
…
…
SHDN
Figure 5. Paralleling MAX1697s to Reduce Output Resistance
Chip Information
MAX1697 MAX1697
2
1 V OUT
C2
2
+V IN
C1
C2
SHDN
C1
3 3
4 4
6
5 5
6 1
V OUT = -nV IN
…
…
Figure 4. Cascading MAX1697s to Increase Output Voltage