參數(shù)資料
型號(hào)： MAX1720
廠(chǎng)商： ON SEMICONDUCTOR
元件分類(lèi)： 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(kāi)關(guān)電容電壓反相器)
中文描述： SOT23封裝、開(kāi)關(guān)電容電壓反相器，帶有關(guān)斷
文件頁(yè)數(shù)： 6/18頁(yè)
文件大?。?/td> 182K
代理商： MAX1720
MAX1720
http://onsemi.com
6
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C
1
will
lower the output resistance and larger values of C
2
will
reduce output voltage ripple. (See Equation 3).
Table 1 shows various values of C
1
, C
2
and C
3
with the
corresponding output resistance values at 25
°
C. Table 2
shows the output voltage ripple for various values of C
1
, C
2
and C
3
. The data in Tables 1 and 2 was measured not
calculated.
Table 1. Output Resistance vs. Capacitance
(C
1
= C
2
= C
3
), V
in
= 4.75 V and V
out
= 4.0 V
C
1
= C
2
= C
3
( F)
R
( )
0.7
129.1
1.4
69.5
3.3
37.0
7.3
26.5
10
25.9
24
24.1
50
24
Table 2. Output Voltage Ripple vs. Capacitance
(C
1
= C
2
= C
3
), V
in
= 4.75 V and V
out
= 4.0 V
C
1
= C
2
= C
3
( F)
Output Voltage Ripple
(mV)
0.7
382
1.4
342
3.3
255
7.3
164
10
132
24
59
50
38
Input Supply Bypassing
The input voltage, V
in
should be capacitively bypassed to
reduce AC impedance and minimize noise effects due to the
switching internals in the device. If the device is loaded from
V
out
to GND, it is recommended that a large value capacitor
(at least equal to C
1
) be connected from V
in
to GND. If the
device is loaded from V
in
to V
out
, a small (0.7 F) capacitor
between the pins is sufficient.
Voltage Inverter
The most common application for a charge pump is the
voltage inverter (Figure 14). This application uses two or
three external capacitors. The C
1
(pump capacitor) and C
2
(output capacitor) are required. The input bypass capacitor,
C
3
, may be necessary depending on the application. The
output is equal to V
in
plus any voltage drops due to loading.
Refer to Tables 1 and 2 for capacitor selection. The test setup
used for the majority of the characterization is shown in
Figure 14.
Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also, use a large ground plane to minimize noise
leakage into other circuitry.
Capacitor Resources
Selecting the proper type of capacitor can reduce switching
loss. Low ESR capacitors are recommended. The MAX1720
was characterized using the capacitors listed in Table 3. This
list identifies low ESR capacitors for the voltage inverter
application.
Table 3. Capacitor Types
Manufacturer/Contact
Part Types/Series
AVX
8434489411
www.avxcorp.com
TPS
Cornell Dubilier
5089968561
www.cornelldubilier.com
ESRD
Sanyo/Oscon
6196616835
www.sanyovideo.com/oscon.htm
SN
SVP
Vishay
6032241961
www.vishay.com
593D
594
6
4
2
3
1
OSC
Capacitors = 10 F
+
+
V
in
5
+
V
out
Figure 18. Voltage Inverter
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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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