MAX829 ONSEMI [ON Semiconductor], MAX829 Datasheet - Page 14

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

external switch transistors and two Schottky diodes. The output voltage is approximately equal to −V
base emitter drops of both transistors and the forward voltage of both diodes. The performance characteristics for the converter
are shown below. Note that the output resistance is reduced to 0.9 and 1.0 ohms for the 828 and 829 respectively.
The output current capability of the MAX828 and MAX829 can be extended beyond 600 mA with the addition of two
−1.0
−2.0
−3.0
−4.0
−5.0
0
Figure 43. Parallel Load Regulation, Output
T
A
= 25 C
Voltage vs. Output Current MAX828
20
I
out
, OUTPUT CURRENT (mA)
V
in
Figure 45. External Switch for Increased Negative Output Current
40
B
+
−V
out
C
3
= V
60
A
1
2
3
in
−V
BE(Q1) −
OSC
Curve
80
C
D
A
B
MAX828, MAX829
V
http://onsemi.com
BE(Q2)
5
4
100
V
−2 V
in
5.0
3.0
5.0
3.0
14
(V)
F
−1.0
−2.0
−3.0
−4.0
−5.0
0
R
Q
Q
out
13.3
17.3
14.4
17.3
2
1
Figure 44. Parallel Load Regulation, Output
C
C
Q
Q
T
+
(W)
A
1
3
1
2
C
= C
= 220 mF
= PZT751
= PZT651
= 25 C
1
Voltage vs. Output Current MAX829
2
20
= 470 mF
I
out
D
+
, OUTPUT CURRENT (mA)
40
C
2
−V
C
out
60
in
minus the sum of the
80
100