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參數(shù)資料
| 型號(hào)： | MAX1720EUTG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched Capacitor Voltage Inverter with Shutdown |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 21 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | LEAD FREE, TSOP-6 |
| 文件頁(yè)數(shù)： | 15/18頁(yè) |
| 文件大?。?/td> | 191K |
| 代理商： | MAX1720EUTG |
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MAX1720
http://onsemi.com
15
The MAX1720 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 is shown below. Note that the output resistance is reduced to 1.9 .
8.0
I
out
, OUTPUT CURRENT (A)
V
o
,
0
0.4
0.5
0.3
0.2
0.1
0.6
6.8
8.4
7.6
8.8
Figure 43. Positive Doubler with Current Boosted Load Regulation, Output Voltage vs. Output Current
V
in
= 5.0 V
R
out
= 1.9
T
A
= 25
°
C
7.2
Figure 44. Line and Load Regulated Positive Output Voltage Doubler with High Current Capability
+
6
4
2
3
1
OSC
+
V
in
5
V
out
Q
1
C
3
+
C
2
Q
2
C
1
Capacitors = 220 F
Q
1
= PZT751
Q
2
= PZT651
R
2
R
1
10 k
50
50
This converter is a combination of Figures 42 and the shunt regulator to close the loop. In this case the anode of the regulator
is connected to ground. This convert provides a line and load regulated output of 7.6 V at up to 300 mA with an input voltage
of 5.0 V. The output will regulate at a level of V
ref
(R
2
/R
1
+ 1). The open loop configuration is the dashed line and the closed
loop is the solid line. The performance characteristics are shown below.
8.0
I
out
, OUTPUT CURRENT (A)
Figure 45. Current Boosted Close Loop Load
Regulation, Output Voltage vs. Output Current
V
o
,
0
0.4
0.5
0.3
0.2
0.1
0.6
6.8
8.4
7.6
8.8
V
in
= 5.0 V
R
out
= 1.9
R
out
= 0.5
R
1
= 10 k
R
2
= 51.3 k
T
A
= 25
°
C
Open Loop
Closed Loop
7.2
6.0
V
in
, INPUT VOLTGE (V)
V
o
,
1.0
4.0
5.0
3.0
2.0
6.0
1.0
7.0
5.0
8.0
Figure 46. Current Boosted Close Loop Line
Regulation, Output Voltage vs. Input Voltage
I
out
= 100 mA
R
1
= 10 k
R
2
= 51.3 k
T
A
= 25
°
C
4.0
3.0
2.0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MAX1721EUT | 制造商:Maxim Integrated Products 功能描述:VOLTAGE INVERTER - Rail/Tube |
| MAX1721EUT+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP INV -5.5V TO -1.4V 25MA 6PIN SOT-23 - Rail/Tube |
| MAX1721EUT+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 |
| MAX1721EUTT | 制造商:MAXIM 功能描述:New |
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