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参数资料
| 型号： | LTC2914CGN-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MONITOR QUAD 16SSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
LTC2914
APPLICATIONS INFORMATION
+
–
Voltage Monitoring
The LTC2914 is a low power quad voltage monitoring cir-
cuit with four undervoltage and four overvoltage inputs. A
timeout period that holds OV or 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
configured to monitor a positive voltage V n using the
3-resistor circuit configuration 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 divider.
If an input is configured as a negative voltage monitor, the
outputs UV n and OV n in Figure 1 are swapped internally. V n
is then connected as shown in Figure 2. Note, VHn is still
connected to the high-side tap and VLn is still connected
to the low-side tap.
Polarity Selection
The three-state polarity-select pin (SEL) selects one of three
possible polarity combinations for the input thresholds,
as described in Table 1. When an input is configured for
negative supply monitoring, VHn is configured to trigger an
overvoltage condition and VLn is configured to trigger an
undervoltage condition. With this configuration, an OV con-
dition occurs when the supply voltage is more negative than
the configured threshold and a UV condition occurs when
the voltage is less negative than the configured threshold.
V n
The three-state input pin SEL is connected to GND, V CC or
left unconnected during normal operation. When the pin
is left unconnected, the maximum leakage allowed from
the pin is ±10μA to ensure it remains in the open state.
Table 1 shows the three possible selections of polarity
based on the SEL pin connection.
Table 1. Voltage Polarity Programming (V UOT = 0.5V Typical)
SEL V3 INPUT V4 INPUT
V CC Positive Positive
VH3 < V UOT → UV VH4 < V UOT → UV
VL3 > V UOT → OV VL4 > V UOT → OV
Open Positive Negative
VH3 < V UOT → UV VH4 < V UOT → OV
VL3 > V UOT → OV VL4 > V UOT → UV
GND Negative Negative
VH3 < V UOT → OV VH4 < V UOT → OV
VL3 > V UOT → UV VL4 > V UOT → UV
3-Step Design Procedure
The following 3-step design procedure allows selecting
appropriate resistances to obtain the desired UV and OV trip
points for the positive voltage monitor circuit in Figure 1
and the negative voltage monitor circuit in Figure 2. 1%
resistor tolerances are suggested to maintain the ±1.5%
threshold accuracy.
LTC2914
REF
1V
R C
LTC2914
VHn
UV n
R A
VHn
OV n
–
–
R B
R A
VLn
+
0.5V
OV n
R B
VLn
+
0.5V
UV n
2914 F01
R C
Figure 1. 3-Resistor Positive UV/OV Monitoring Configuration
V n
2914 F02
Figure 2. 3-Resistor Negative UV/OV Monitoring Configuration
2914fc
For more information www.linear.com/LTC2914
9
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