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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)： | 5/18頁(yè) |
| 文件大?。?/td> | 191K |
| 代理商： | MAX1720EUTG |
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MAX1720
http://onsemi.com
5
6
4
2
3
1
OSC
V
out
C
1
C
2
+
R
L
+
+C
3
V
in
Figure 14. Test Setup/Voltage Inverter
5
C
1
= C
2
= C
3
= 10 F
DETAILED OPERATING DESCRIPTION
The MAX1720 charge pump converter inverts the voltage
applied to the V
in
pin. Conversion consists of a twophase
operation (Figure 15). During the first phase, switches S
2
and
S
4
are open and S
1
and S
3
are closed. During this time, C
1
charges to the voltage on V
in
and load current is supplied from
C
2
. During the second phase, S
2
and S
4
are closed, and S
1
and
S
3
are open. This action connects C
1
across C
2
, restoring
charge to C
2
.
Figure 15. Ideal Switched Capacitor Charge Pump
S3
S4
C
2
C
1
S1
S2
V
in
V
out
From Osc
APPLICATIONS INFORMATION
Output Voltage Considerations
The MAX1720 performs voltage conversion but does not
provide regulation. The output voltage will drop in a linear
manner with respect to load current. The value of this
equivalent output resistance is approximately 26 nominal
at 25
°
C with V
in
= 5.0 V. V
out
is approximately 5.0 V at light
loads, and drops according to the equation below:
VDROP
Vout
Iout
Rout
VDROP)
(Vin
Charge Pump Efficiency
The overall power conversion efficiency of the charge
pump is affected by four factors:
1. Losses from power consumed by the internal
oscillator, switch drive, etc. (which vary with input
voltage, temperature and oscillator frequency).
2. I
2
R losses due to the onresistance of the MOSFET
switches onboard the charge pump.
3. Charge pump capacitor losses due to Equivalent
Series Resistance (ESR).
4. Losses that occur during charge transfer from the
commutation capacitor to the output capacitor when
a voltage difference between the two capacitors
exists.
Most of the conversion losses are due to factors 2, 3 and 4.
These losses are given by Equation 1.
PLOSS(2,3,4)
Iout
2
Rout
Iout
2
1
(fOSC)C1
8RSWITCH
4ESRC1
ESRC2
(eq. 1)
The 1/(f
OSC
)(C
1
) term in Equation 1 is the effective output
resistance of an ideal switched capacitor circuit (Figures 16
and 17).
The losses due to charge transfer above are also shown in
Equation 2. The output voltage ripple is given by Equation 3.
0.5C2(VRIPPLE
2
2VoutVRIPPLE)]
fOSC
PLOSS
[ 0.5C1(Vin
2
Vout
2
)
(eq. 2)
VRIPPLE
Iout
(fOSC)(C2)
2(Iout)(ESRC2)
(eq. 3)
R
L
C
2
C
1
V
in
V
out
f
Figure 16. Ideal Switched Capacitor Model
R
L
C
2
V
in
V
out
R
EQUIV
REQUIV
1
f
C1
Figure 17. Equivalent Output Resistance
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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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