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| 型号： | LTC2919CMS-3.3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR PREC 3.3V 10-MSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.921V，可调，可调 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
LTC2919
APPLICATIO S I FOR ATIO
Table 2b. Possible Combinations of Supply Monitoring. For Example Purposes, All Supplies are Monitored at 5% Tolerance and
Connections are Shown Only for ADJ1, ADJ2, REF, SEL, OUT1 and OUT2. Output Pull-up Resistors are Omitted for Clarity.
SEL OPEN
15V
R P6
2.37M
–15V
R N6
1.02M
R P5
10.7k
ADJ1 OUT1
ADJ2 OUT2
UV
OV
R N5
4.02k
ADJ1 OUT1
ADJ2 OUT2
OV
UV
R P4
76.8k
R N4
30.9k
REF
SEL
REF
SEL
1 Positive UV and OV
1 Negative UV and OV
15V
R P2
309k
–15V
R N2
309k
–15V
R N2
1.02M
15V
R P2
619k
ADJ1 OUT1
ADJ2 OUT2
UV (15V)
UV (–15V)
ADJ1 OUT1
ADJ2 OUT2
OV (–15V)
OV (15V)
R P1
11.5k
R N1
10.7k
R N1
30.9k
R P1
20k
REF
SEL
REF
SEL
1 Positive UV, 1 Negative UV
1 Negative OV, 1 Positive OV
15V
5V
–15V
–5V
R P2A
309k
R P1A
11.5k
R P2B
133k
R P1B
13.7k
ADJ1 OUT1
ADJ2 OUT2
REF SEL
UV (15V)
OV (5V)
R N2A
1.02M
R N1A
30.9k
R N2B
137k
R N1B
13.3k
ADJ1 OUT1
ADJ2 OUT2
REF SEL
OV (–15V)
UV (–5V)
1 Positive UV, 1 Positive OV
Adjust Input Trip Point
The trip threshold for the supplies monitored by the
adjustable inputs is set with an external resistor divider,
allowing the user complete control over the trip point.
Selection of this trip voltage is crucial to the monitoring
of the system.
Any power supply has some tolerance band within which
it is expected to operate (e.g., 5V ±10%). It is generally
undesirable that a supervisor issue a reset when the power
supply is inside this tolerance band. Such a “nuisance”
reset reduces reliability by preventing the system from
functioning under normal conditions.
1 Negative UV, 1 Negative OV
To prevent nuisance resets, the supervisor threshold must
be guaranteed to lie outside the power supply tolerance
band. To ensure that the threshold lies outside the power
supply tolerance range, the nominal threshold must lie out-
side that range by the monitor’s accuracy speci?cation.
All three of the LTC2919 inputs (ADJ1, ADJ2, V CC UVLO)
have the same maximum threshold accuracy of ±1.5% of
the programmed nominal input voltage (over the full operat-
ing temperature range). Therefore, using the LTC2919, the
typical 10% UV threshold is at 11.5% below the nominal
input voltage level. For a 5V input, the threshold is nominally
4.425V. With ±1.5% accuracy, the trip threshold range is
2919f
10
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