MAX1720 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
MAX1720 Datasheet PDF : 18 Pages
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MAX1720
A single device can be used to construct a negative voltage tripler. The output voltage is approximately equal to −3Vin minus
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.
0
−2.0
−4.0
A
B
−6.0
−8.0
C
−10.0
D
−12.0
−14.0
TA = 25°C
−16.0
0
10
20
30
40
50
Iout, OUTPUT CURRENT
Figure 25. Tripler Load Regulation, Output Voltage vs. Output Current
Curve
A
B
C
D
Vin (V)
3.0
3.0
5.0
5.0
All Diodes
1N4148
Rout (W)
267
MBRA120E
250
1N4148
205
MBRA120E
195
Vin
+
1
6
OSC
+
2
5
+
Vout
3
4
Capacitors = 10 mF
Figure 26. Positive Output Voltage Doubler
A single device can be used to construct a positive voltage doubler. The output voltage is approximately equal to 2Vin minus
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.
10.0
D
Curve
8.0
A
C
B
6.0
B
C
4.0
D
A
2.0
TA = 25°C
0
0
10
20
30
40
Iout, OUTPUT CURRENT (mA)
Figure 27. Doubler Load Regulation, Output Voltage vs. Output Current
Vin (V)
3.0
3.0
5.0
5.0
All Diodes
1N4148
Rout (W)
32
MBRA120E
26
1N4148
26
MBRA120E
21
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