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MAX829EUK

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
MAX828, MAX829
http://onsemi.com
13
A 3.0 1N4148
B 3.0 MBRA120E
Curve V
in
(V) Diodes
110
96.5
MAX828
R
out
(W)
C 5.0 1N4148
D 5.0 MBRA120E
84.5
78.2
111
96.7
MAX829
R
out
(W)
87.3
77.1
+
5
4
2
3
1
OSC
MAX828 Capacitors = 10 F
MAX829 Capacitors = 3.3 F
V
in
5
4
2
3
1
OSC
+
−V
out
+
+
Figure 42. Paralleling Devices for Increased Negative Output Current
An increase in converter output current capability with a reduction in output resistance can be obtained by paralleling two
or more devices. The output current capability is approximately equal to the number of devices paralleled. A single shared
output capacitor is sufficient for proper operation but each device does require it’s own pump capacitor. Note that the output
ripple frequency will be complex since the oscillators are not synchronized. The output resistance is approximately equal to
the output resistance of one device divided by the total number of devices paralleled. The performance characteristics for a
converter consisting of two paralleled devices is shown below.
0
−1.0
−2.0
4020
−3.0
−4.0
−5.0
80 100
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
60
Figure 43. Parallel Load Regulation, Output
Voltage vs. Output Current MAX828
A
B
0
−1.0
−2.0
4020
−3.0
−4.0
−5.0
80 10
0
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
60
Figure 44. Parallel Load Regulation, Output
Voltage vs. Output Current MAX829
C
D
T
A
= 25°C T
A
= 25°C
MAX828, MAX829
http://onsemi.com
14
A 5.0
B 3.0
Curve V
in
(V)
13.3
17.3
R
out
()
C 5.0
D 3.0
14.4
17.3
+
5
4
2
3
1
OSC
+
V
in
−V
out
Q
1
C
3
−V
out
= V
in
−V
BE(Q1)
−
V
BE(Q2)
−2 V
F
+
C
2
Q
2
C
1
C
1
= C
2
= 470 F
C
3
= 220 F
Q
1
= PZT751
Q
2
= PZT651
Figure 45. External Switch for Increased Negative Output Current
The output current capability of the MAX828 and MAX829 can be extended beyond 600 mA with the addition of two
external switch transistors and two Schottky diodes. The output voltage is approximately equal to −V
in
minus the sum of the
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.
−2.6
I
out
, OUTPUT CURRENT (A)
V
out
, OUTPUT VOLTAGE (V)
0 0.4 0.50.30.20.1 0.6
−3.2
−2.4
−2.8
−2.2
Figure 46. Current Boosted Load Regulation,
Output Voltage vs. Output Current MAX828
V
in
= 5.0 V
R
out
= 0.9
T
A
= 25°C
−3.0
−2.6
I
out
, OUTPUT CURRENT (A)
V
out
, OUTPUT VOLTAGE (V)
0 0.4 0.50.30.20.1 0
.6
−3.2
−2.4
−2.8
−2.2
−2.0
Figure 47. Current Boosted Load Regulation,
Output Voltage vs. Output Current MAX829
V
in
= 5.0 V
R
out
= 1.0
T
A
= 25°C
−3.0
MAX828, MAX829
http://onsemi.com
15
Figure 48. Positive Output Voltage Doubler with High Current Capability
+
5
4
2
3
1
OSC
+
V
in
V
out
Q
1
C
3
+
C
2
Q
2
C
1
Capacitors = 220 F
Q
1
= PZT751
Q
2
= PZT651
50
50
The MAX828/829 can be configured to produce a positive output voltage doubler with current capability in excess of
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
in
minus the sum of the 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 1.8.
8.0
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
0 0.4 0.50.30.20.1
6.8
8.4
7.6
8.8
Figure 49. Positive Doubler with Current
Boosted Load Regulation, Output Voltage vs.
Output Current, MAX828
V
in
= 5.0 V
R
out
= 1.8
T
A
= 25°C
7.2
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
7.0
9.0
Figure 50. Positive Doubler with Current
Boosted Load Regulation, Output Voltage vs.
Output Current, MAX829
V
in
= 5.0 V
R
out
= 1.8
T
A
= 25°C
7.4
8.6
8.2
7.8
0.6 0 0.4 0.50.30.20.1 0
.6
+
5
4
2
3
1
OSC
MAX828: Capacitors = 10 F
MAX829: Capacitors = 3.3 F
+
+
V
in
+
+
+V
out
Figure 51. A Positive Doubler, with a Negative Inverter
−V
out
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX829EUK

Mfr. #:
Buy MAX829EUK
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators Switched Cap Voltage
Lifecycle:
New from this manufacturer.
Delivery:
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