MAX829 ONSEMI [ON Semiconductor], MAX829 Datasheet - Page 15

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

500 mA. This is accomplished with the addition of two external switch transistors and two Schottky diodes. The output voltage
is approximately equal to 2V
diodes. The performance characteristics for the converter are shown below. Note that the output resistance is reduced to 1.8 W.
The MAX828/829 can be configured to produce a positive output voltage doubler with current capability in excess of
−2.2
−2.4
−2.6
−2.8
−3.0
−3.2
8.0
8.8
8.4
7.6
7.2
6.8
0
0
Figure 46. Current Boosted Load Regulation,
Boosted Load Regulation, Output Voltage vs.
Output Voltage vs. Output Current MAX828
Figure 49. Positive Doubler with Current
0.1
0.1
V
I
out
I
in
Output Current, MAX828
out
, OUTPUT CURRENT (mA)
Figure 48. Positive Output Voltage Doubler with High Current Capability
, OUTPUT CURRENT (A)
0.2
0.2
+
in
C
minus the sum of the base emitter drops of both transistors and the forward voltage of both
0.3
3
0.3
1
2
3
0.4
0.4
OSC
V
R
T
V
R
T
A
A
in
in
out
out
= 25 C
= 25 C
= 5.0 V
= 5.0 V
= 0.9 W
0.5
= 1.8 W
0.5
MAX828, MAX829
http://onsemi.com
5
4
0.6
0.6
15
50
50
−2.0
−2.2
−2.4
−2.6
−2.8
−3.0
−3.2
9.0
8.6
8.2
7.8
7.4
7.0
Capacitors = 220 mF
Q
Q
0
0
1
2
= PZT751
= PZT651
Figure 47. Current Boosted Load Regulation,
Boosted Load Regulation, Output Voltage vs.
Q
Q
Output Voltage vs. Output Current MAX829
2
1
Figure 50. Positive Doubler with Current
C
0.1
0.1
1
+
I
out
I
Output Current, MAX829
out
, OUTPUT CURRENT (mA)
, OUTPUT CURRENT (A)
0.2
0.2
+
C
0.3
0.3
2
V
out
0.4
0.4
V
R
T
V
R
T
A
A
in
out
in
out
= 25 C
= 25 C
= 5.0 V
= 5.0 V
= 1.0 W
0.5
= 1.8 W
0.5
0.6
0.6