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參數(shù)資料
| 型號： | LTC1429CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Clock-Synchronized Switched Capacitor Regulated Voltage Inverter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, SO-14 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 275K |
| 代理商： | LTC1429CS |
6
LTC1429
APPLICATIO
S I
FOR
ATIO
U
creating a voltage between V
CC
and OUT of up to 2
×
V
CC
.
In doubler mode, the LTC1429 uses a single flying capaci-
tor to invert the input supply voltage and the output voltage
is stored on the output bypass capacitor between switch
cycles. The LTC1429CS8 is always configured in doubler
mode and has only one pair of flying capacitor pins (Figure
3a). The LTC1429CS can be configured in doubler mode by
connecting a single flying capacitor between the C1
+
and
C2
–
pins; C1
–
and C2
+
should be left floating (Figure 3b).
W
U
U
voltage; the total voltage between the V
CC
and OUT pins is
3
×
V
CC
. Tripler mode can be used to generate –5V from
a single positive 3.3V supply, for example. Tripler mode
requires two external flying capacitors. The first connects
between C1
+
and C1
–
and the second between C2
+
and C2
–
(Figure 3c). Because of the relatively high voltages that can
be generated in this mode, care must be taken to ensure
that the total input-to-output voltage never exceeds 12V,
or the LTC1429 may be damaged. This is possible with
supply voltages above 4V in tripler mode and above 6V in
doubler mode, although in most applications the output
voltage will be kept in check by the regulation loop. As the
input supply voltage rises, the allowable output voltage
drops, finally reaching –4V with a 8.5V supply. To avoid
this problem, use doubler mode whenever possible with
high input supply voltages.
THEORY OF OPERATION
A block diagram of the LTC1429 is shown in Figure 4. The
heart of the LTC1429 is the charge pump core, shown in the
dashed line. It generates a negative output voltage by first
charging the flying caps between V
CC
and ground. It then
Figure 4. Block Diagram
1
2
3
4
5
6
7
14
13
12
11
10
9
8
C1
C2
C1
+
C1
–
C2
+
C2
–
LTC1429CS
LTC1429 F03
1
2
3
4
5
6
7
14
13
12
11
10
9
8
C1
C1
+
C1
–
C2
+
C2
–
LTC1429CS
1
2
3
4
8
7
6
5
C1
+
C1
–
C1
LTC1429CS8
(a)
SO-8 DOUBLER MODE
(b)
S0-14 DOUBLER MODE
(c)
SO-14 TRIPLER MODE
Figure 3. Flying Capacitor Connections
Tripler Mode
The LTC1429CS can be used in a tripler mode which can
generate negative output voltages up to twice the supply
S
R
Q
S2
S3
S7
S1
S5
V
CC
V
OUT
V
OUT
LTC1429 F04
60mV
1.18V
1.24V
R
ADJ
*
R1*
R0*
*LTC1429CS14 ONLY
C
OUT
C1
–
C1
+
C1
S4
S6
C2
–
50k
100k
226k
INTERNALLY
CONNECTED FOR
FIXED OUTPUT
VOLTAGE PARTS
124k
C2
+
C2
+
ADJ/COMP
REG
SHUTDOWN
–
+
COMP 1
–
+
COMP 2
SYNC/SD
DELAY
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