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参数资料
| 型号： | MAX972EBL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/17页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR OPN DRN DL 9UCSP |
| 标准包装： | 2,500 |
| 类型： | 通用 |
| 元件数： | 2 |
| 输出类型： | 开路漏极 |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 11 V，±1.25 V ~ 5.5 V |
| 电压 - 输入偏移（最小值）： | 10mV @ 5V |
| 电流 - 输出（标准）： | 0.015mA @ 5V |
| 电流 - 静态（最大值）： | 4µA |
| CMRR, PSRR（标准）： | 80dB CMRR，80dB PSRR |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | * |
| 安装类型： | * |
| 包装： | * |
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
12
______________________________________________________________________________________
2) Select R1. The leakage current into INB- is normally
under 1nA, so the current through R1 should exceed
100nA for the thresholds to be accurate. R1 values
up to about 10M
can be used, but values in the
100k
to 1M range are usually easier to deal with.
In this example, choose R1 = 294k
.
3) Calculate R2 + R3. The overvoltage threshold
should be 5.5V when VIN is rising. The design
equation is as follows:
4) Calculate R2. The undervoltage threshold should be
4.5V when VIN is falling. The design equation is as
follows:
5) Calculate R3:
Choose R3 = 1M
(1% standard value)
6) Verify the resistor values. The equations are as
follows, evaluated for the above example:
Battery Switchover Circuit
The switchover from line-powered DC to a backup
battery is often accomplished with diodes. But this
simple method is sometimes unacceptable, due to the
voltage drop and associated power loss across the
diode in series with the battery. Figure 6’s circuit
replaces the diode with a P-channel MOSFET
controlled by one of the MAX9_3 comparator outputs.
When the DC wall adapter drops below 4V (determined
by R1 and R2), OUTA goes low, turning on Q1.
Comparator B is used to measure the battery voltage,
and gives a “low-battery” indication when the battery
drops below 3.6V.
Level-Shifter
Figure 7 shows a circuit to shift from bipolar ±5V inputs
to single-ended 5V outputs. The 10k
resistors protect
the comparator inputs, and do not materially affect the
circuit’s operation.
Overvoltage Threshold :
V
(V
V )
(R1
R2
R3)
R1
5.474V
Undervoltage Threshold :
V
(V
V )
(R1
R2
R3)
(R1 + R2)
4.484V
where the hysteresis voltage V
V
R5
R4
OTH
REF
H
UTH
REF
H
REF
=+
×
++
=
×
++
=
=×
.
RR
R
Mk
M
32
3
2
1 068
61 9
1 006
(
+
)
.
=
=
=
RR
R
VV
V
R
kM
k
Choose R
k
s
dard value
REF
H
UTH
21
2
3
1
294
1 068
1 182
0 005
45
294
62 2
261 9
1
(
+
)
(
)
(
+
.
)
(.
.
)
.
( %
).
=×
=
×
=
tan
RR
R
V
VV
k
M
OTH
REF
H
23
1
294
55
1 182
0 005
1
1 068
.
(.
.
)
.
+=
×
+
= ×
+
=
MAX9_3
INB-
REF
HYST
INA+
3
5
6
4
1
8
V-
2
V+
7
1M
OUTA
OUTB
R5
10k
R1
294k
R2
62.2k
R3
1M
POWER GOOD
VIN
VOTH = 5.5V
VUTH = 4.5V
R4
2.4M
5V
Figure 5. Window Detector
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX972EPA | 功能描述:校验器 IC Dual Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX972EPA+ | 功能描述:校验器 IC Dual Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX972ESA | 功能描述:校验器 IC Dual Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX972ESA+ | 功能描述:校验器 IC Dual Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX972ESA+T | 功能描述:校验器 IC Dual Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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