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参数资料
| 型号： | LTC2919IMS-2.5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR PREC 2.5V 10-MSOP |
| 标准包装： | 50 |
| 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： | 2.213V，可调，可调 |
| 工作温度： | -40°C ~ 85°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： | 管件 |
LTC2919
APPLICATIO S I FOR ATIO
If the user’s application requires, the SEL pin may be driven
using a three-state buffer which satis?es the V IL , V IH and
leakage conditions of this three-state input pin.
If the state of the SEL pin con?gures a given input as
“negative polarity,” the voltage at that ADJ pin must be
below the trip point (0.5V nominal), or the corresponding
OUT and RST output will be pulled low. Conversely, if a
given input is con?gured as “positive polarity”, the ADJ pin
voltage must be above the trip point or the corresponding
OUT and RST will assert low.
Thus, a “negative polarity” input may be used to deter-
mine whether a monitored negative voltage is smaller in
absolute value than it should be (–UV), or a monitored
positive voltage is larger than it should be (+OV). The
opposite is true for a “positive polarity” input (–OV or
+UV). These polarity de?nitions are also shown in Table
1. For purposes of this data sheet, a negative voltage is
considered “undervoltage” if it is closer to ground than it
should be (e.g., –4.3V for a –5V supply).
Proper con?guration of the SEL pin and setting of the
trip-points via external resistors allows for any two fault
conditions to be detected. For example, the LTC2919 may
monitor two supplies (positive, negative or one of each)
for UV or for OV (or one UV and one OV). It may also
monitor a single supply (positive or negative) for both UV
and OV. Tables 2a and 2b show example con?gurations
for monitoring possible combinations of fault condition
and supply polarity.
Table 2a. 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 = V CC
SEL = GND
15V
R P2A
309k
R P2B
115k
5V
–15V
R N2A
309k
–5V
R N2B
137k
ADJ1 OUT1
ADJ2 OUT2
UV (15V)
UV (5V)
ADJ1 OUT1
ADJ2 OUT2
UV (–15V)
UV (–5V)
R P1A
11.5k
R P1B
13.7k
R N1A
10.7k
R N1B
13.3k
REF
2 Positive UV
SEL
REF
2 Negative UV
SEL
–15V
R N2A
1.02M
–5V
R N2B
137k
15V
R P2A
619k
R P2B
133k
5V
ADJ1 OUT1
ADJ2 OUT2
OV (–15V)
OV (–5V)
ADJ1 OUT1
ADJ2 OUT2
OV (15V)
0V (5V)
R N1A
30.9k
R N1B
11.8k
R P1A
20k
R P1B
13.7k
REF
2 Negative OV
SEL
REF
2 Positive OV
SEL
15V
R P2
309k
–15V
R N2
1.02M
15V
R P2
619k
–15V
R N2
309k
ADJ1 OUT1
ADJ2 OUT2
UV (15V)
OV (–15V)
ADJ1 OUT1
ADJ2 OUT2
OV (15V)
UV (–15V)
R P1
11.5k
R N1
30.9k
R P1
20k
R N1
10.7k
REF
SEL
REF
SEL
1 Positive UV, 1 Negative OV
1 Positive OV, 1 Negative UV
2919f
9
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