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参数资料
| 型号： | LTC3631EMS8E-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V 0.1A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.5 V ~ 45 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 100mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LTC3631
APPLICATIONS INFORMATION
Output Voltage Programming
For the adjustable version, the output voltage is set by
an external resistive divider according to the following
equation:
controller is enabled. Figure 7 shows examples of con-
figurations for driving the RUN pin from logic.
V SUPPLY V IN
V OUT = 0.8V ? ? 1 +
R2 ?
?
?
R1 ?
?
LTC3631
RUN
4.7M
LTC3631
RUN
3631 F07
R3
? ? ? OUT ?
Δ I VIN = ?
The resistive divider allows the V FB pin to sense a fraction
of the output voltage as shown in Figure 6. Output voltage
can range from 0.8V to V IN .
V OUT
R1
V FB
LTC3631 R2
GND
3631 F06
Figure 6. Setting the Output Voltage
To minimize the no-load supply current, resistor values in
the megohm range should be used; however, large resistor
values should be used with caution. The feedback divider
is the only load current when in shutdown. If PCB leak-
age current to the output node or switch node exceeds
the load current, the output voltage will be pulled up. In
normal operation, this is generally a minor concern since
the load current is much greater than the leakage. The
increase in supply current due to the feedback resistors
can be calculated from:
? V OUT ? ? V ?
? R1 + R2 ? ? V IN ?
Figure 7. RUN Pin Interface to Logic
The RUN pin can alternatively be configured as a precise
undervoltage lockout (UVLO) on the V IN supply with a
resistive divider from V IN to ground. The RUN pin com-
parator nominally provides 10% hysteresis when used in
this method; however, additional hysteresis may be added
with the use of the HYST pin. The HYST pin is an open-
drain output that is pulled to ground whenever the RUN
comparator is not tripped. A simple resistive divider can
be used as shown in Figure 8 to meet specific V IN voltage
requirements.
V IN
R1
RUN
R2 LTC3631
HYST
3631 F08
Figure 8. Adjustable Undervoltage Lockout
Specific values for these UVLO thresholds can be computed
from the following equations:
Rising ? V IN ? UVLO ? Threshold = 1.21V ? ? 1 +
Falling ? V IN ? UVLO ? Threshold = 1.10V ? ? 1 +
R2 ?
R2 + R3 ?
Run Pin with Programmable Hysteresis
The LTC3631 has a low power shutdown mode controlled
by the RUN pin. Pulling the RUN pin below 0.7V puts the
LTC3631 into a low quiescent current shutdown mode
(I Q ~ 3μA). When the RUN pin is greater than 1.2V, the
?
?
?
?
R1 ?
?
R1 ?
?
3631fe
For more information www.linear.com/LTC3631
13
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