参数资料
型号: LTC2914CGN-1#PBF
厂商: Linear Technology
文件页数: 11/18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 =
? 46.4k ? 8.45k ≈ 549k
R CUV = (R AUV + R BUV ) ?
V UV
V REF
(49.9k + 49.9k) ?
≈ 698k
3.  DetermineR C tocompletethedesign.
–5V – 1V
9.947μA
V CC
5V
V CC
REF OV
2. Calculate R CUV based on the desired undervoltage trip
point of –6V.
=
–6V – 1V
1V
R AOV =
R A
46.4k
R B
8.45k
R C
549k
LTC2914
VH3 UV
VL3 SEL
GND
3. Calculate R AOV and I na
V REF – 0.5V
I nd
=
1V – 0.5V
10μA
≈ 49.9k
V3
–5V ± 10%
2914 F04
I na ≈ 10.020μA
Figure 4. Negative Supply Monitor
4. Calculate R BOV for a desired overvoltage trip point of
–30V.
Negative Voltage Monitoring Example 2
Negative voltage monitoring applications with wide operat-
ing voltage ranges such that:
R BOV =
0.5V – V OV
I na
=
0.5V – 30 – 1
10.020μA
≈ 3.01M
2 ? V UV < V OV
V CC
5V
create situations where the VH or VL pins exceeds the
–0.3V absolute maximum voltage ratings. To ensure that
the LTC2914 operates within its design specifications,
utilize the equations shown below to determine proper
resistor sizing for the circuit in Figure 5. In the following
example, the undervoltage trip point is –6V. The overvolt-
age trip point is –30V.
D1
R AUV
49.9k
R BUV
49.9k
A
R AOV
49.9k
R BOV
3.01M
V CC
REF
LTC2914
VH3
VL3
GND
OV
UV
SEL
R CUV
R AUV =
V REF – 0.5V 1V – 0.5V
= ≈ 49.9k
I na =
V REF – 0.5V 1V – 0.5V
R AUV
R AUV
1A.FindR AUV andR BUV andletnodeAbeavirtualground,
which ensures that the diode current will not affect the
voltage monitor threshold accuracy. Let the resistive
divider current I nd = 10μA.
I nd 10μA
R AUV = R BUV
1B. Calculate I na using the resistor values chosen above.
= ≈ 10.020μA
2914 F05
698k
V3
Figure 5. Negative Supply Monitor for Wide Operating Range
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 LTC2914 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 control.
Once all VH inputs and V CC become valid an internal timer
is started. After an adjustable delay time, UV weakly pulls
high.
2914fc
For more information www.linear.com/LTC2914
11
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