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参数资料
| 型号： | LTC2919IMS-2.5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16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
4.425V ±75mV over temperature (i.e., 10% to 13% below
5V). The monitored system must thus operate reliably
down to 4.35V or 13% below 5V over temperature.
The above discussion is concerned only with the DC value
of the monitored supply. Real supplies also have relatively
high frequency variations from sources such as load
transients, noise and pickup.
The LTC2919 uses two techniques to combat spurious
outputs toggling from high frequency variation. First,
the timeout period helps prevent high frequency varia-
tion whose frequency is above 1/ t RST from appearing at
the RST output. Second, the propagation delay versus
it may be added externally. See 48V Telecom UV/OV with
Hysteresis Applications on page 14 for an example.
Selecting External Resistors
In a typical positive supply monitoring application, the
ADJx pin connects to a tap point on an external resistive
divider between a positive voltage being monitored and
ground, as shown in Figure 1.
When monitoring a negative supply, the ADJx pin connects
to a tap point on a resistive divider between the negative
voltage being monitored and the buffered reference (REF),
as shown in Figure 2.
overdrive function ?lters short glitches before the OUT1,
OUT2 toggling or RST pulling low.
V MON
–
When an ADJ becomes invalid, the corresponding OUT
and RST pin assert low. When the supply recovers past
the valid threshold, the reset timer starts (assuming it is
not disabled) and RST does not go high until it ?nishes.
If the supply becomes invalid any time during the timeout
period, the timer resets and starts fresh when the supply
R P2
R P1
ADJx
0.5V
+
+
–
next becomes valid.
To reduce sensitivity of short glitches from toggling the
output pins, the comparator outputs go through a lowpass
?lter before triggering the output logic. Any transient at the
input of a comparator needs to be of suf?cient magnitude
and duration to pass the ?lter before it can change the
2919 F01
Figure 1. Setting Positive Supply Trip Point
REF
monitor state.
The combination of the reset timeout and comparator
R N1
R N2
ADJx
+
–
?ltering prevents spurious changes in the output state
without sacri?cing threshold accuracy. If further supply
glitch immunity is needed, the user may place an external
V MON
0.5V
+
–
capacitor from the ADJ input to ground. The resultant RC
lowpass ?lter with the resistor divider will further reject
high frequency components of the supply, at the cost of
slowing the monitor’s response to fault conditions.
A common solution to the problem of spurious reset is
to introduce hysteresis around the nominal threshold.
However, this hysteresis degrades the effective accuracy
of the monitor and increases the range over which the
system must operate. The LTC2919 therefore does not
have hysteresis, except in comparator mode (by tying
2919 F02
Figure 2. Setting Negative Supply Trip Point
Normally the user will select a desired trip voltage based
on their supply and acceptable tolerances, and a value of
R N1 or R P1 based on current draw. Current used by the
resistive divider will be approximately:
0.5V 0.5V
I = . OR =
R P1 R N1
TMR pin to V CC ). If hysteresis is desired in other modes,
2919f
11
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