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參數(shù)資料
| 型號： | MAX1720 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Switched Capacitor Voltage Inverter with Shutdown(帶關(guān)斷功能的開關(guān)電容電壓反相器) |
| 中文描述： | SOT23封裝、開關(guān)電容電壓反相器，帶有關(guān)斷 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大小： | 182K |
| 代理商： | MAX1720 |
MAX1720
http://onsemi.com
13
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 performance characteristics for a converter consisting of two paralleled
devices is shown below.
0
0
1.0
2.0
40
30
20
3.0
4.0
5.0
10
50
80
100
I
out
, OUTPUT CURRENT (mA)
Figure 36. Parallel Load Regulation, Output
Voltage vs. Output Current
V
o
,
60
70
90
A
B
T
A
= 25
°
C
A
5.0
B
3.0
Curve
V
in
(V)
14.5
17
R
out
( )
+
6
4
2
3
1
OSC
+
V
in
5
V
out
Q
1
C
3
V
out
= V
in
V
BE(Q1)
V
BE(Q2)
2 V
F
Figure 37. External Switch for Increased Negative Output Current
+
C
2
Q
2
C
1
C
1
= C
2
= 470 F
C
3
= 220 F
Q
1
= PZT751
Q
2
= PZT651
The output current capability of the MAX1720 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 .
2.8
I
out
, OUTPUT CURRENT (mA)
V
o
,
0
0.4
0.5
0.3
0.2
0.1
0.6
3.2
2.6
3.0
2.4
2.2
Figure 38. Current Boosted Load Regulation, Output Voltage vs. Output Current
V
in
= 5.0 V
R
out
= 0.9
T
A
= 25
°
C
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1720EUT | 功能描述:電荷泵 Switched Cap Voltage RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1720EUT+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP INV -1.25V TO -5.5V 25MA 6PIN SOT-23 - Rail/Tube |
| MAX1720EUT+T | 功能描述:電荷泵 Switched-Cap Voltage Inverter w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1720EUTG | 功能描述:電荷泵 Switched Cap Voltage Inverter w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1720EUT-T | 功能描述:電荷泵 Switched-Cap Voltage Inverter w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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