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參數(shù)資料
| 型號： | LTC1911EMS8-1.8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 200K |
| 代理商： | LTC1911EMS8-1.8 |
4
LTC1911-1.5/LTC1911-1.8
sn1911 1911is
TYPICAL PERFOR U
Start-Up Time
vs Soft-Start Capacitor
Output Ripple
vs Output Load Current
Output Current Transient Response
Line Transient Response
SOFT-START CAPACITOR (nF)
0.1
0.1
S
1
10
100
1
10
1911 G10
100
T
A
= –40
°
C
T
A
= 25
°
C
T
A
= 85
°
C
V
IN
= 3.6V
4V
V
IN
3V
500mV/DIV
V
20mV/DIV
I
OUT
= 225mA
20
μ
s/DIV
1911 G14
250mA
25mA
I
OUT
V
20mV/DIV
V
IN
= 3.6V
10
μ
s/DIV
1911 G13
V
IN
(Pin 1):
Input Supply Voltage. V
IN
may be between
2.7V and 5.5V. Suggested bypass for V
IN
is a 10
μ
F (1
μ
F
min) ceramic low ESR capacitor.
C2
+
(Pin 2):
Flying Capacitor Two Positive Terminal.
C2
–
(Pin 3):
Flying Capacitor Two Negative Terminal.
GND (Pin 4):
Ground. Connect to a ground plane for best
performance.
C1
–
(Pin 5):
Flying Capacitor One Negative Terminal.
V
OUT
(Pin 6):
Regulated Output Voltage. V
OUT
is discon-
nected from V
IN
during shutdown. Bypass V
OUT
with a
≥
10
μ
F ceramic low ESR capacitor (4
μ
F min, ESR < 0.1
max).
C1
+
(Pin 7):
Flying Capacitor One Positive Terminal.
PIU
SS/SHDN (Pin 8):
Soft-Start/Shutdown Control Pin. This
pin is designed to be driven with an external open-drain
output. Holding the SS/SHDN pin below 0.3V will force
the LTC1911-X into shutdown mode. An internal pull-up
current of 2
μ
A will force the SS/SHDN voltage to climb to
V
IN
once the device driving the pin is forced into a Hi-Z
state. To limit inrush current on start-up, connect a
capacitor between the SS/SHDN pin and GND. Capaci-
tance on the SS/SHDN pin will limit the dV/dt of the pin
during turn on which, in turn, will limit the dV/dt of V
OUT
.
By selecting an appropriate soft-start capacitor, the user
can control the inrush current for a known output capaci-
tor during turn-on (see Application Information). If nei-
ther of the two functions are desired, the pin may be left
floating or tied to V
IN
.
LTC1911-1.8 Output Voltage Ripple
V
50mV/DIV
2-TO-1 MODE
V
IN
= 5V
I
= 250mA
ALL WAVEFORMS AC COUPLED
100ns/DIV
1911 G12
OUTPUT LOAD CURRENT (mA)
0
0
O
P
)
5
10
15
20
30
50
100
150
200
1911 G11
250
300
25
T
A
= 4.7
μ
F
T
A
= 10
μ
F
T
A
= 22
μ
F
V
50mV/DIV
3-TO-2 MODE
V
IN
= 3.6V
V
50mV/DIV
1-TO-1 MODE
V
IN
= 2.7V
V
IN
(V)
2.5
1.40
F
1.45
1.50
1.55
1.60
3.0
3.5
4.0
4.5
1911 G15
5.0
5.5
T
A
= –40
°
C
T
A
= 25
°
C
T
A
= 85
°
C
Oscillator Frequency
vs Supply Voltage
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