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参数资料
| 型号： | MIC2779L-1BM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 5/6页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR ADJ HYSTER SOT23-5 |
| 标准包装： | 3,000 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2779L-1BM5TR MIC2779L-1BM5TR-ND |
V BAT(lo) = V REF ?
? R1 + R2 + R3 ?
?
?
R2 + R3
V BAT(lo) = 3.1V = 1.24 ?
? 1M ? ?
? R2 + 344k ?
V BAT(hi) = V REF ?
? R1 + R2 + R3 ?
?
?
R3
MIC2779
Applications Information
Programming the Thresholds
The low-voltage threshold is calculated using:
?
The high-voltage threshold is calculated using:
?
where, for both equations:
V REF = 1.240V
In order to provide the additional criteria needed to solve
for the resistor values, the resistors can be selected such
that they have a given total value, that is, R1 + R2 + R3 =
R TOTAL . A value such as 1MΩ for R TOTAL is a reasonable
value because it draws minimum battery current but has no
measurable effect on accuracy.
When working with large resistors, a small amount of leak-
age current can cause voltage offsets that degrade system
accuracy. The maximum recommended total resistance from
V BAT to ground is 3MΩ.
Micrel, Inc.
Once R3 is determined, the equation for V BAT(lo) can be
used to determine R2. A single lithium-ion cell should not be
discharged below 2.5V. Many applications limit the drain to
3.1V. Using 3.1V for the V BAT(lo) threshold allows calculation
of the two remaining resistor values.
?
R2 = 56k ?
R1 = 1M ? ? R2 ? R3
R1 = 600k ?
The accuracy of the resistors can be chosen based upon the
accuracy required by the system.
Input Transients
The MIC2779 is inherently immune to very short negative-
going “glitches.” Very brief transients may exceed the V BAT(lo)
threshold without tripping the output.
As shown in Figure 2, the narrower the transient, the deeper
the threshold overdrive that will be ignored by the MIC2779.
The graph represents the typical allowable transient dura-
tion for a given amount of threshold overdrive that will not
generate a reset.
R 1 604k
R 2 56k
LTH
R 3 340k
V BATT
1%
1%
1%
MIC2779
VDD / R S T
R ST
HTH GND
140
120
100
80
60
40
Input Transient
Response
20
Figure 1. Example Circuit
0
1
10
100
1000
V BAT(hi) = 1.24 ?
? 1M ? ?
? R3 ?
Oncethedesiredtrippointsaredetermined,settheV BAT(hi)
threshold ?rst.
For example, use a total of 1MΩ = R1 + R2 + R3. For a typical
single-cell lithium ion battery, 3.6V is a good “high threshold”
because at 3.6V the battery is moderately charged. Solving
for R3:
?
R3 = 344k ?
RESET COMP. OVERDRIVE, V REF –V LTH (mV)
Figure 2. Input Transient Response
January 2006
5
MIC2779
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