MAX1697 Maxim, MAX1697 Datasheet - Page 10

• Manufacturer Part Number: MAX1697
• Description: 60mA / SOT23 Inverting Charge Pump with Shutdown
• Manufacturer: Maxim

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