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參數(shù)資料
| 型號： | LTC1429 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Clock-Synchronized Switched Capacitor Regulated Voltage Inverter |
| 中文描述： | 時(shí)鐘同步開關(guān)電容穩(wěn)壓電壓逆變器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大小： | 275K |
| 代理商： | LTC1429 |
3
LTC1429
ELECTRICAL CHARACTERISTICS
F
SYNC
= 700kHz with 50% duty cycle square wave, unless otherwise noted.
The
G
denotes specifications which apply over the full operating
temperature range.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
Setting output to < –7V will exceed the total voltage maximum
rating with a 5V supply. With supplies higher than 4V the output should
never be set to exceed (V
CC
– 12V).
Note 3:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground, unless otherwise
specified. All typicals are given at T
A
= 25
°
C.
Note 4:
C1 = C2 = 0.1
μ
F means the specifications apply to tripler mode
where V
CC
– V
OUT
= 3.3V
CC
(LTC1429CS only; the LTC1429CS8 cannot be
connected in tripler mode), with C1 connected between C1
+
and C1
–
and
C2 connected between C2
+
and C2
–
. C2 = 0 implies doubler mode where
V
CC
– V
OUT
= 2V
CC
; for the LTC1429CS, this means C1 connects from C1
+
to C2
–
with C1
–
and C2
+
floating. For the LTC1429CS8 in doubler mode,
C1 connects from C1
+
to C1
–
; there are no C2 pins.
Note 5:
Adjustable output parts only; does not apply to fixed output parts.
Note 6:
For output voltages below –4.5V, the LTC1429 may reach 50%
duty cycle and fall out of regulation with heavy load or low input voltages.
Beyond this point, the output will follow the input with no regulation.
Note 7:
LTC1429 will operate with square wave of 40% to 60% duty cycle.
For best performance, use a square wave with 50% duty cycle.
Note 8:
Maximum frequency is not tested. Typical part can be used
beyond 2MHz.
LTC1429CS
TYP
1
2
35
5
SYMBOL
V
OUT
PARAMETER
Output Regulation
CONDITIONS
–1.24V
≥
V
OUT
≥
–4V, 0
≤
I
OUT
≤
12mA
–4V
≥
V
OUT
≥
–5V, 0
≤
I
OUT
≤
8mA
V
OUT
= 0V
I
OUT
= 5mA, V
OUT
= –4V
MIN
MAX
5
5
75
UNITS
G
G
%
%
I
SC
V
RIP
Output Short Circuit Current
Output Ripple Voltage
G
mA
mV
Doubler Mode, V
CC
= 5V, C1 = 0.1
μ
F, C2 = 0 (Note 4), C
OUT
= 3.3
μ
F, F
SYNC
=700kHz with 50% duty cycle, unless otherwise noted.
LTC1429CS8/LTC1429CS
MIN
TYP
SYMBOL
V
OUT
PARAMETER
Output Regulation
CONDITIONS
–1.24V
≥
V
OUT
≥
–4V, 0
≤
I
OUT
≤
10mA
–4V
≥
V
OUT
≥
–4.5V, 0
≤
I
OUT
≤
10mA (Note 6)
V
OUT
Set to –4V, 0
≤
I
OUT
≤
10mA
V
OUT
= 0V
I
OUT
= 5mA, V
OUT
= –4V
MAX
5
5
–4.20
125
UNITS
G
G
1
2
%
%
V
V
OUT
I
SC
V
RIP
Output Voltage
Output Short Circuit Current
Output Ripple Voltage
G
–3.80
–4.00
80
10
G
mA
mV
Tripler Mode,V
CC
= 3.3V, C1 = C2 = 0.1
μ
F (Note 4), C
OUT
= 3.3
μ
F,
Maximum Output Current vs
Supply Voltage
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
(See Test Circuits; Figure 1 for Doubler Mode, Figure 2 for Tripler Mode)
Output Voltage vs Output Current
Output Voltage vs Supply Voltage
OUTPUT CURRENT (mA)
0
O
–4.02
–4.06
–4.10
–4.08
–4.04
–4.00
–3.96
–3.92
8
LTC1429 TPC01
–3.98
–3.94
–3.90
2
1
3
5
7
9
4
6
10
T
A
= 25
°
C
V
= 3.3V
TRIPLER MODE
V
CC
= 5V
DOUBLER MODE
SUPPLY VOLTAGE (V)
3.0
O
–4.04
–4.05
–4.06
7.0
LTC1429 TPC02
–4.03
–4.02
–4.00
4.0
5.0
6.0
–4.01
–4.08
–4.07
3.5
4.5
5.5
6.5
DOUBLER MODE
I
L
= 5mA
TRIPLER MODE
I
L
= 5mA
T
A
= 25
°
C
SUPPLY VOLTAGE (V)
3.0
0
M
5
15
20
25
6.5
6.0
45
LTC1429 TPC03
10
3.5
4.0
4.5
5.0
5.5
7.0
30
35
40
V
OUT
= –4V
±
5%
T
A
°
C
TRIPLER MODE
DOUBLER MODE
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