參數(shù)資料
型號： LMK316BJ475KL
廠商： Texas Instruments, Inc.
英文描述： UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
中文描述： 未穩(wěn)壓60 mA充電泵電壓型逆變器
文件頁數(shù)： 15/23頁
文件大?。?/td> 430K
代理商： LMK316BJ475KL
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 4. Measurement Results on the TPS60400 (Typical)
VI
[V]
IO( )
[mA]
CI
[
μ
F]
C(fly)
[
μ
F]
CO
[
μ
F]
LP
[
μ
H]
CP
[
μ
F]
BW = 500 MHz
VPOUT
VP
–
P[mV]
320
BW = 20 MHz
VPOUT
VP
–
P[mV]
240
VPOUT
VACeff [mV]
CERAMIC
CERAMIC
CERAMIC
CERAMIC
5
60
1
1
1
65
5
60
1
1
2.2
120
240
32
5
60
1
1
1
0.1 (X7R)
260
200
58
5
60
1
1
1
0.1
0.1 (X7R)
220
200
60
5
60
1
1
2.2
0.1
0.1 (X7R)
120
100
30
5
60
1
1
10
0.1
0.1 (X7R)
50
28
8
rail splitter
TPS60400
OUT
C1+
IN
C1
–
GND
1
2
3
5
4
C(fly)
1
μ
F
CO
1
μ
F
CI
1
μ
F
VO (
–
VI)
GND
VI
GND
C3
1
μ
F
Figure 26. TPS60400 as a High-Efficiency Rail Splitter
A switched-capacitor voltage inverter can be configured as a high efficiency rail-splitter. This circuit provides a
bipolar power supply that is useful in battery powered systems to supply dual-rail ICs, like operational amplifiers.
Moreover, the SOT23-5 package and associated components require very little board space.
After power is applied, the flying capacitor (C
(fly)
) connects alternately across the output capacitors C
3
and C
O
.
This equalizes the voltage on those capacitors and draws current from V
I
to V
O
as required to maintain the
output at 1/2 V
I
.
The maximum input voltage between V
I
and GND in the schematic (or between IN and OUT at the device itself)
must not exceed 6.5 V.
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