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参数资料
| 型号： | LTC1911EMS8-1.8 |
| 厂商： | Linear Technology |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 1.8V 0.25A 8MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 250mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP |
| 其它名称： | LTC1911EMS81.8 |
LTC1911-1.5/LTC1911-1.8
TYPICAL PERFOR A CE CHARACTERISTICS
Start-Up Time
vs Soft-Start Capacitor
Output Ripple
vs Output Load Current
Oscillator Frequency
vs Input Supply Voltage
100
V IN = 3.6V
30
1.60
T A = –40 ° C
T A = 25 ° C
T A = 85 ° C
25
C OUT = 4.7 μ F
1.55
T A = –40 ° C
10
20
T A = 25 ° C
15
C OUT = 10 μ F
1.50
1
10
5
C OUT = 22 μ F
1.45
T A = 85 ° C
0.1
0.1
1 10
100
0
0
50
100 150 200
250
300
1.40
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V OUT
50mV/DIV
2-TO-1 MODE
V IN = 5V
V OUT
50mV/DIV
3-TO-2 MODE
V IN = 3.6V
V OUT
50mV/DIV
1-TO-1 MODE
V IN = 2.7V
SOFT-START CAPACITOR (nF)
1911 G10
LTC1911-1.8 Output Voltage Ripple
250mA
I OUT
25mA
V OUT
20mV/DIV
OUTPUT LOAD CURRENT (mA)
1911 G11
Output Current Transient Response
4V
V IN
500mV/DIV
3V
V OUT
20mV/DIV
V IN (V)
Line Transient Response
1911 G15
I OUT = 250mA 100ns/DIV
1911 G12
V IN = 3.6V
10 μ s/DIV
1911 G13
I OUT = 225mA
20 μ s/DIV
1911 G14
ALL WAVEFORMS AC COUPLED
PI FU CTIO S
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.
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 .
1911f
4
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