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参数资料
| 型号： | MIC2009YM6TX |
| 厂商： | Micrel Inc |
| 文件页数： | 26/30页 |
| 文件大小： | 0K |
| 描述： | IC DISTRIBUTION SW ADJ SOT23-6 |
| 标准包装： | 3,000 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 100 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 可调 |
| 输入电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 带卷 (TR) |
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Micrel, Inc.
To prevent false triggering of the VUVLO feature, the
MIC20X6 includes a delay timer to blank out
momentary excursions below the VUVLO trip point. If
V IN stays below the VUVLO trip point for longer than
32ms (typical), then the load is disengaged and the
MIC20X6 will wait 128ms before reapplying power to
the load. If V IN remains below the VUVLO trip point,
then the load will be powered for the 32ms blanking
period and then again disengaged. This is illustrated in
the scope plot below. If V IN remains above the VUVLO
trip point MIC20X6 resumes normal operation.
MIC20xx Family
Calculating VUVLO Resistor Divider Values
The VUVLO feature is designed to keep the internal
switch off until the voltage on the VUVLO pin is greater
than 0.25V. A resistor divider network connected to the
VUVLO and VIN pins is used to set the input trip
voltage V TRIP (see Figure 10). The value of R2 is
chosen to minimize the load on the input supply I DIV and
the value of R1 sets the trip voltage V TRIP .
The value of R2 is calculated using:
R 2 =
V VUVLO
I DIV
The vale of R1 is calculated using:
R1 = R2 × ? ?
? 1 ? ?
? V TRIP
? V VUVLO
Where for both equations:
V VUVLO = 0.25V
?
?
Figure 9. VUVLO Operation
VUVLO and Kickstart? operate independently in the
MIC2016. If the high-current surge allowed by
Kickstart? causes V IN to dip below the VUVLO trip
point for more than 32ms, VUVLO will disengage the
load, even though the Kickstart? timer has not timed
out.
When working with large value resistors, a small
amount of leakage current from the VUVLO terminal
can cause voltage offsets that degrade system
accuracy. Therefore, the maximum recommended
resistor value for R2 is 100k ? .
Using the divider loading current I DIV of 100μA, the
value of R2 can be estimated by:
I IN_LOAD
R 2 =
0 . 25 V
100 μA
= 2 . 5 k Ω
Input
Supply
+
R1
VIN
VOUT
MIC20X6
+
Now the value of R1 can be calculated by:
R 1 = 2 . 5 k Ω × ?
? 1 ? = 45 k
R2
VUVLO
? 4 . 75 V
? 0 . 25 V
?
?
Figure 10. VUVLO Application Circuit
where:
V TRIP = 4.75V (for a 5V supply)
V VUVLO = 0.25V
August 2011
26
M9999-080211-D
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