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参数资料
| 型号： | LTC2913CDD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12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
R B =
0.5V V n
Voltage Monitoring
The LTC2913 is a low power dual voltage monitoring
circuit with two undervoltage and two overvoltage inputs.
A timeout period that holds OV and UV asserted after all
faults have cleared is adjustable using an external capacitor
and is externally disabled.
Each voltage monitor has two inputs (VHn and VLn) for
detecting undervoltage and overvoltage conditions. When
con?gured to monitor a positive voltage V n using the
2. Choose R B to obtain the desired UV trip point
Once R A is known, R B is chosen to set the desired trip
point for the undervoltage monitor.
? – R A (2)
I n V UV
3. Choose R C to complete the design
Once, R A and R B are known, R C is determined by:
3-resistor circuit con?guration shown in Figure 1, VHn
is connected to the high side tap of the resistive divider
and VLn is connected to the low side tap of the resistive
R C =
V n
I n
– R A – R B
(3)
R A =
divider.
3-Step Design Procedure
The following 3-step design procedure determines ap-
propriate resistances to obtain the desired UV and OV trip
points for the voltage monitor circuit in Figure 1.
For supply monitoring, V n is the desired nominal operat-
ing voltage, I n is the desired nominal current through the
resistive divider, V OV is the desired overvoltage trip point
and V UV is the desired undervoltage trip point.
1. Choose R A to obtain the desired OV trip point
R A is chosen to set the desired trip point for the
If any of the variables V n , I n , V UV or V OV change, then each
step must be recalculated.
Voltage Monitor Example
A typical voltage monitor application is shown in Figure 2.
The monitored voltage is a 5V ±10% supply. Nominal cur-
rent in the resistive divider is 10μA.
1. Find R A to set the OV trip point of the monitor.
0.5V 5V
? 45.3k
10μ A 5.5V
2. Find R B to set the UV trip point of the monitor.
R A =
0.5V V n
R B =
overvoltage monitor.
?
I n V OV
(1)
0.5V 5V
? – 45.3k 10.2k
10μA 4.5V
3. Determine R C to complete the design.
V n
R C
LTC2913
R C =
5V
10μA
– 45.3k 10.2k 442k
VHn
UV n
V1
5V ± 10%
V CC
5V
–
R B
+
0.5V
R C
442k
VH1
V CC
OV
R A
VLn
OV n
R B
10.2k
R A
45.3k
LTC2913
VL1
GND
UV
2913 F01
Figure 1. 3-Resistor Positive UV/OV Monitoring Con?guration
2913 F02
Figure 2. Typical Supply Monitor
2913fb
7
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