60mA, SOT23 Inverting Charge Pump
with Shutdown
…
+VIN
2
2
3
3
MAX1697
MAX1697
C1
4
C1
4
6
5
1
6
…
C2
5
1 VOUT
C2
SHDN
VOUT = -nVIN
Figure 4. Cascading MAX1697s to Increase Output Voltage
SHDN
3
5
+VIN
2
D1, D2 = 1N4148
C1
4 MAX1697
D1
6
1
VOUT = -VIN
C2
D2
VOUT = (2VIN) -
C3
C4 (VFD1) - (VFD2)
Figure 6. Combined Doubler and Inverter
…
+VIN
2
2
3
MAX1697
3
MAX1697
C1
4
C1
4
6
1
6
1
VOUT
5
SHDN
ROUT
=
ROUT OF SINGLE DEVICE
NUMBER OF DEVICES
…
5
VOUT = -VIN
C2
Figure 5. Paralleling MAX1697s to Reduce Output Resistance
GND 4
MAX1697
OUT 1
V+
RL
Figure 7. Heavy Load Connected to a Positive Supply
Chip Information
TRANSISTOR COUNT: 275
10 ______________________________________________________________________________________