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參數(shù)資料
| 型號(hào)： | MAX868EUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Regulated, Adjustable -2x Inverting Charge Pump |
| 中文描述： | 0.035 A SWITCHED CAPACITOR REGULATOR, 630 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 1.11 MM HEIGHT, UMAX-10 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 152K |
| 代理商： | MAX868EUB |
M
__________________Design Proc edure
S etting the Output V oltage
Set the output voltage using two external resistors, R1
and R2, as shown in Figure 4. Since the input bias cur-
rent at FB has a 50nA maximum, large resistor values in
the feedback loop do not significantly degrade accura-
cy. Begin by selecting R2 in the 100k
to 500k
range,
and calculate R1 using the following equation:
where V
OUT
is the desired output voltage, and V
REF
is
any available regulated positive voltage. When the
MAX868 is powered by a regulated voltage, V
IN
can be
used as the reference for setting the output voltage.
When the MAX868 is powered by an unregulated sup-
ply, such as when operating directly from a battery, use
any available positive reference voltage in the system.
Note that due to the MAX868’s doubling and inverting
charge-pump action, the output voltage is limited to
-2 x V
IN
.
Alternatively, to configure the MAX868 as a simple,
unregulated doubler-inverter (V
OUT
= -2 x V
IN
), con-
nect FB to IN. In this configuration, the MAX868 runs at
its maximum oscillator frequency, operating as a con-
ventional, open-loop charge pump.
If multiple oscillator cycles are required to regulate the
output, reduce the values for R1 and R2, or parallel a
small capacitor (C
C
) across R1 to compensate the
feedback loop and ensure stability. Choose the lowest
capacitor value that ensures stability; values up to 47pF
are adequate for most applications.
R
R
x
V
V
OUT
REF
1
2
|
|
=
Regulated, Adjustable -2x
Inverting Charge Pump
6
_______________________________________________________________________________________
C
OUT
V
OUT
C2-
C1+
C1-
C2+
IN
IN
GND
(a)
(b)
C
OUT
V
OUT
C2-
C2+
C1-
C1+
Figure 2.
a)
In charge phase, the left-hand switches are
closed and the right-hand switches are open, charging the fly-
ing capacitors (C1 and C2) while the output capacitor (C
OUT
)
services the load.
b)
The equivalent circuit of the charge phase
of operation.
C2-
C1+
C1-
C2+
IN
(a)
(b)
C
OUT
V
OUT
C
OUT
V
OUT
C2+
C2-
C1+
C1-
Figure 3.
a)
In discharge phase, the left-hand switches are
open and the right-hand switches are closed, transferring
energy from the flying capacitors (C1 and C2) to the output
capacitor (C
OUT
).
b)
The equivalent circuit of the discharge
phase of operation.
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| MAX868EUB+ | 功能描述:電荷泵 Reg/Adj -2x Invertin Charge Pump 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 |
| MAX868EUB+T | 功能描述:電荷泵 Reg/Adj -2x Invertin Charge Pump 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 |
| MAX868EUB-T | 功能描述:電荷泵 Reg/Adj -2x Invertin Charge Pump 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 |
| MAX868MUB/PR | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX86900EFD+ | 制造商:Maxim Integrated Products 功能描述:FIRST GEN BIO SENSOR WITH RED AND IR LED INTEGRATED IN OESIP - Rail/Tube 制造商:Maxim Integrated Products 功能描述:SENSOR RED/IR LED OESIP |
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