MAX1720 ON Semiconductor, MAX1720 Datasheet - Page 8

• Manufacturer Part Number: MAX1720
• Description: Switched Capacitor Voltage Inverter
• Manufacturer: ON Semiconductor

the forward voltage drop of each external diode. The performance characteristics for the above converter are shown below.
Note that curves A and C show the circuit performance with economical 1N4148 diodes, while curves B and D are with lower
loss MBRA120E Schottky diodes.
Figure 23. Doubler Load Regulation, Output Voltage vs. Output Current
A single device can be used to construct a negative voltage doubler. The output voltage is approximately equal to −2V
−10.0
−2.0
−4.0
−6.0
−8.0
0
0
V
in
V
10
+
A
B
I
out
in
, OUTPUT CURRENT (mA)
+
1
2
3
Figure 22. Negative Output Voltage Doubler
Capacitors = 10 mF
Figure 24. Negative Output Voltage Tripler
20
C
D
1
2
3
OSC
Capacitors = 10 mF
OSC
http://onsemi.com
30
6
5
4
T
A
MAX1720
= 25°C
+
6
5
4
8
40
+
+
+
+
Curve
A
B
C
D
+
+
+
+
V
in
3.0
3.0
5.0
5.0
−V
(V)
out
+
−V
MBRA120E
MBRA120E
All Diodes
out
1N4148
1N4148
R
out
124
115
96
94
in
minus
(W)