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参数资料
| 型号： | LTC2914CGN-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MONITOR QUAD 16SSOP |
| 标准包装： | 100 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
LTC2914
APPLICATIONS INFORMATION
R C
R B
10k
R A
45.3k
For positive supply monitoring, V n is the desired nomi-
nal operating voltage, I nd is the desired nominal current
through the resistive divider, I na is the resistive divider
current calculated using the 1% resistor R A . V OV is the
desired overvoltage trip point and V UV is the desired
undervoltage trip point.
For negative supply monitoring, to compensate for the 1V
reference, 1V must be subtracted from V n , V OV and V UV
before using each in the following equations.
1A. Choose R A to obtain the desired OV trip point
V1 V CC
5V ± 10% 5V
442k V CC
VH1 OV
LTC2914
VL1 UV
SEL
GND
2914 F03
Figure 3. Positive Supply Monitor
1A. Find R A to set the OV trip point of the monitor.
? n
R A =
I n
V OV
R A =
?
I na =
?
R A ischosentosetthedesiredtrippointfortheover-
voltage monitor.
0.5V V
(1)
1B. Calculate I na
0.5V 5V
10μA 5.5V
1B. Calculate I na
0.5V 5V
45.3k 5.5V
≈ 45.3k
= 10.034μA
? n
I na =
R B =
– 45.3k ? 10k
?
? n –R A
R B =
(2)
R C =
V n
I na
R C =
– 45.3k ? 10k ≈ 442k
R A =
≈ 46.4k
?
= 9.947μA
I no ?
?
0.5V V
R A V OV
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.
0.5V V
I na V UV
3. Choose R C to Complete the Design
Once R A and R B are known, R C is determined by:
–R A –R B (3)
If any of the variables V n , I na , I nd , V UV or V OV change, then
each step must be recalculated.
Positive Voltage Monitor Example
A positive voltage monitor application is shown in Figure 3.
The monitored voltage is a 5V ±10% supply. Nominal
current in the resistive divider is 10μA.
2. Find R B to set the UV trip point of the monitor.
0.5V 5V
10.034μA 4.5V
3. Determine R C to complete the design.
5V
10.034μA
Negative Voltage Monitor Example 1
A negative voltage monitor application is shown in Figure 4.
The monitored voltage is a –5V ±10% supply. Nominal
current in the resistive divider is 10μA. For the negative
case, 1V is subtracted from V n , V OV and V UV .
1A. Find R A to set the OV trip point of the monitor.
0.5V –5V – 1V
10μA –5.5V – 1V
1B. Calculate I na
0.5V –5V – 1V
46.4k –5.5V – 1V
2. Find R B to set the UV trip point of the monitor.
?
R B =
0.5V –5V – 1V
9.947μA –4.5V – 1V
? 46.4k ? 8.45k
2914fc
10
For more information www.linear.com/LTC2914
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