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參數(shù)資料
| 型號： | SP682 |
| 英文描述： | Ultra-Low Power Inverting Voltage Doubler(極低功耗，反相電壓倍增器) |
| 中文描述： | 超低功耗反相電壓倍增（極低功耗，反相電壓倍增器） |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 92K |
| 代理商： | SP682 |
5
SP682DS/07
SP682 Inverting Voltage Doubler
Copyright 2000 Sipex Corporation
Table 1. R
OUT
.vs. C1, C2
Table 2. C3 .vs. V
RIPPLE
The ESR of the charge pump capacitors also
determine the output resistance. Assuming that
switch resistances are approximately equal, the
output resistance can be derived as shown be-
low:
R
OUT
= 16*(R
SW1-4
) + 4*( ESR
C1
+ ESR
C2
) + ESR
C3
+ 1 / (f
OSC
* C1) + 1 / (f
OSC
* C2)
R
is typically 140
at +25
°
C with VCC at
+5V using 3.3
μ
F capacitors. The total internal
switch resistance (16*R
) is approximately
90
. The table below shows the comparison of
R
OUT
versus C1&C2.
C1, C2 (
μ
F)
0.05
0.10
0.47
1.00
3.30
4.70
10.00
22.00
ROUT (
)
4085
2084
510
285
140
125
105
94
The output voltage ripple is also affected by the
capacitors, specifically C
. Larger values
will reduce the output ripple for a given load of
current. The formula representation is:
V
RIPPLE
= {1 / [2 * (f
OSC
* C3)] + 2 * (ESR
C3
)} * I
OUT
To minimize the output ripple, the C
OUT
storage
capacitor can be increased to over 10
μ
the pump capacitors can range from 1
μ
F to 5
μ
F.
Table 2
shows the typical V
RIPPLE
for given
C
OUT
values.
C
OUT
(
μ
F)
0.50
1.00
3.30
4.70
10.00
22.00
V
RIPPLE
(mV)
1020
520
172
120
70
43
SHUTDOWN FEATURE
The
SP682
charge pump includes a shutdown
feature (pin 8) which disables the charge pump
when the V
is not needed. A logic "1" will
activate the shutdown. If shutdown is not needed,
it can be left open where an internal pull-down
resistor will always keep the charge pump ac-
tive. Typical input current for the shutdown pin
is 3
μ
A. The shutdown feature is another option
for conserving power in portable applications.
PARALLEL DEVICES
Multiple
SP682
charge pumps can be connected
in parallel. However, the effective output resis-
tance now is the output resistance of a single
device divided by the number of devices. Con-
necting multiple pumps allows the user to save
on the storage capacitor. The charge pump
capacitors still must be separate for each device.
APPLICATIONS INFORMATION
The
SP682
charge pump produces a doubled,
inverted voltage from the V
input. As such, it
can serve in many applications where a negative
–5V to –10V output is needed. Typical applica-
tions include powering analog switches, and
biasing LCD displays and panels.
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