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参数资料
| 型号： | MAX837EUS-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC V-MONITOR MICROPOWER SOT143-4 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 标准传输延迟为 80 µs |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143-4 |
| 包装： | 剪切带 (CT) |
| 其它名称： | MAX837EUS-TCT |
4-Pin Micropower Voltage Monitors
both parts. For the MAX836, select the ratio of resistors
R1 and R2 so that IN sees 1.204V when the monitor volt-
age falls to or rises above the desired trip point (V TRIP ).
R3 adds hysteresis and is typically an order of magni-
Determine the thermistor ’s resistance (R2) at the
desired temperature. Then, using R2’s resistance and
half the resistance of R3, calculate R1’s value with the
following formula:
R1 = (R2 + R3) ?
?
- 1 ?
tude larger than R1 or R2. The current through R1 and
R2 should be at least 500nA to ensure that the 12nA
maximum input current does not shift the trip point sig-
nificantly. Capacitor C1 adds additional noise rejection.
Monitoring Voltages Other than V CC
The MAX836/MAX837 can monitor voltages other than
V CC (Figure 3). Calculate V TRIP as shown in the
? V CC
1.204
?
?
Programming the Trip Voltage section. The monitored
voltage (V MON ) is independent of V CC . V IN must be 1V
less than V CC .
Heater Temperature Control
Figure 4 shows a basic heater temperature-control cir-
GND
MAX837
OUT
V MON
R1
cuit. Upon power-up, OUT is high and the n-channel
MOSFET turns on. Current flows through the heating
V CC
V CC
IN
element (R4), warming the surrounding area. R2 is a
negative-temperature-coefficient thermistor and as tem-
perature increases, its resistance decreases. As the
thermistor heats up and its resistance decreases, the
MAX837’s voltage at IN decreases until it reaches the
1.204V threshold voltage. At this point, OUT goes low,
turning off the heating element. The thermistor cools
and the voltage at IN rises until it overcomes the
0.1 μ F
Figure 3. Monitoring Voltages Other than V CC
R2
MAX837’s hysteresis (6mV). OUT returns high when this
point is reached, turning on the heating element again.
This cycle repeats as long as power is applied.
V CC
GND
OUT
OUT
0.1 μ F
R1
V CC
V CC
MAX837
IN
R3
V CC
MAX837
IN
THERMISTOR
WITH
NEGATIVE
COEFFICIENT
R2
T
HEATING
ELEMENT
R4
0.1 μ F
R1
R2
C1
R3
GND
OUT
( 1.204 - 1 ) Ω
NOTE: C1 ADDS ADDITIONAL NOISE IMMUNITY
R1 = ( R2 + R3)
V CC
Figure 2. Adding Hysteresis to the Comparator
Figure 4. Heater Temperature Control
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5
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