MAX1720 ON Semiconductor, MAX1720 Datasheet - Page 14

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

with an input voltage of 5.0 V. The output will regulate at a level of −V
below. Note, the dashed line is the open loop and the solid line is the closed loop performance.
This converter is a combination of Figures 37 and 32. It provides a line and load regulated output of −2.36 V at up to 450 mA
−2.2
−2.4
−2.6
−2.8
−3.0
−3.2
0
Figure 40. Current Boosted Load Regulation,
0.1
Output Voltage vs. Output Current
V
in
V
in
I
out
Figure 42. Positive Output Voltage Doubler with High Current Capability
, OUTPUT CURRENT (A)
0.2
+
Figure 39. Line and Load Regulated Negative Output Voltage
+
C
3
0.3
C
1
2
3
3
1
2
3
OSC
0.4
10 k
OSC
V
R
R
R
T
with High Current Capability
A
in
out
1
2
= 25°C
= 10 kW
= 9.0 kW
= 5.0 V
= 0.9 W
0.5
http://onsemi.com
6
5
4
6
5
4
MAX1720
0.6
Q
Q
2
1
14
50
50
−1.0
−1.2
−1.4
−1.6
−1.8
−2.0
−2.2
−2.4
C
C
Q
Q
ref
+
Capacitors = 220 mF
Q
Q
1
3
1
2
3.0
C
= C
= 220 mF
= PZT751
= PZT651
1
2
(R
1
= PZT751
= PZT651
Figure 41. Current Boosted Line Regulation,
2
Q
Q
2
/R
= 470 mF
2
1
1
C
3.5
+ 1). The performance characteristics are shown
1
+
Output Voltage vs. Input Voltage
+
V
in
4.0
, INPUT VOLTAGE (V)
C
2
+
R
R
2
1
C
4.5
2
−V
out
V
out
5.0
I
R
R
T
out
A
1
2
= 25°C
= 10 k
= 9 kW
= 100 mA
5.5
6.0