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参数资料
| 型号： | LTC2913CDD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MONITOR DUAL 10-DFN |
| 标准包装： | 121 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1343 (CN2011-ZH PDF) |
LTC2913
APPLICATIONS INFORMATION
V UV(MIN) = 0.5V ? 0.985 ? 1 +
Power-Up/Power-Down
As soon as V CC reaches 1V during power-up, the UV output
asserts low and the OV output weakly pulls to V CC .
The LTC2913 is guaranteed to assert UV low and OV high
under conditions of low V CC , down to V CC = 1V. Above
V CC = 2V (2.1V maximum), the VH and VL inputs take
The two extreme conditions, with a relative accuracy of
1.5% and resistance accuracy of 1%, result in:
R C ? 0.99
( R A + R B ) ? 1.01
and
R C
R A +R B
control.
Once both VH inputs and V CC are valid, an internal timer
is started. After an adjustable delay time, UV weakly pulls
high.
Threshold Accuracy
Reset threshold accuracy is important in a supply-sensitive
system. Ideally, such a system resets only if supply voltages
V UV(MAX) = 0.5V ? 1.015 ? 1 +
For a desired trip point of 4.5V,
Therefore,
R C ? 1.01
( R A + R B ) ? 0.99
= 8
fall outside the exact thresholds for a speci?ed margin.
All LTC2913 inputs have a relative threshold accuracy of
±1.5% over the full operating temperature range.
V UV(MIN) = 0.5V ? 0.985 ? 1 + 8
and
0.99
1.01
= 4.354V
For example, when the LTC2913 is programmed to moni-
tor a 5V input with a 10% tolerance, the desired UV trip
point is 4.5V. Because of the ±1.5% relative accuracy of
V UV(MAX) = 0.5V ? 1.015 ? 1 + 8
1.01
0.99
= 4.650V
the LTC2913, the UV trip point is between 4.433V and
4.567V which is 4.5V ±1.5%.
Likewise, the accuracy of the resistances chosen for R A ,
R B and R C can affect the UV and OV trip points as well.
Using the example just given, if the resistances used to
set the UV trip point have 1% accuracy, the UV trip range
is between 4.354V and 4.650V. This is illustrated in the
following calculations.
The UV trip point is given as:
Glitch Immunity
In any supervisory application, noise riding on the moni-
tored DC voltage causes spurious resets. To solve this
problem without adding hysteresis, which causes a new
error term in the trip voltage, the LTC2913 lowpass ?lters
the output of the ?rst stage comparator at each input. This
?lter integrates the output of the comparator before as-
serting the UV or OV logic. A transient at the input of the
comparator of suf?cient magnitude and duration triggers
V UV = 0.5V 1 +
R C
R A + R B
the output logic. The Typical Performance Characteristics
show a graph of the Transient Duration vs. Comparator
Overdrive.
2913fb
8
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