MAX829 ONSEMI [ON Semiconductor], MAX829 Datasheet - Page 8

• Manufacturer Part Number: MAX829
• Description: Switched Capacitor Voltage Converter
• Manufacturer: ONSEMI [ON Semiconductor]

capacitors are required for the inverter to function. A third capacitor, the input bypass capacitor, may be required depending
on the power source for the inverter. The performance for this device is illustrated below.
approximately equal to −V
additional stage. This is due to a reduction of input voltage to each successive stage as the converter output is loaded. Note that
the ground connection for each successive stage must connect to the negative output of the previous stage. The performance
characteristics for a converter consisting of two cascaded devices are shown below.
The MAX828 / 829 primary function is a voltage inverter. The device will convert 5.0 V into −5.0 V with light loads. Two
Two or more devices can be cascaded for increased output voltage. Under light load conditions, the output voltage is
−1.0
−2.0
−3.0
−4.0
−5.0
−6.0
0.0
0
T
Figure 25. Voltage Inverter Load Regulation
Output Voltage vs. Output Current MAX828
A
= 25 C
V
V
in
10
in
= 3.3 V
I
out
, OUTPUT CURRENT (mA)
Figure 27. Cascade Devices for Increased Negative Output Voltage
in
V
in
20
times the number of stages. The converter output resistance increases dramatically with each
+
= 5.0 V
+
1
2
3
30
OSC
+
MAX829 Capacitors = 3.3 mF
MAX828 Capacitors = 10 mF
40
MAX828, MAX829
http://onsemi.com
5
4
50
8
−V
−1.0
−2.0
−3.0
−4.0
−5.0
−6.0
out
0.0
+
0
1
2
3
Figure 26. Voltage Inverter Load Regulation
Output Voltage vs. Output Current MAX829
T
A
= 25 C
V
in
OSC
= 3.3 V
10
I
out
+
, OUTPUT CURRENT (mA)
V
in
5
4
= 5.0 V
20
30
40
50