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| 型号： | MAX6457UKD3B+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | IC SUPPLY VOLT MONITOR SOT23-5 |
| 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： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 90 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1417 (CN2011-ZH PDF) |
| 其它名称： | MAX6457UKD3B+TDKR |
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
= V
V REFD REF ?
Detailed Description
Each of the MAX6457–MAX6460 high-voltage (4V to
28V), low-power voltage monitors include a precision
bandgap reference, one or two low-offset-voltage com-
?
?
R 4 ?
R 3 + R 4 ? ?
R 1 = R 2 ? TRIP ? 1 ?
R 1 = R 2 ? TRIP - 1 ?
parators, internal threshold hysteresis, internal timeout
period, and one or two high-voltage open-drain outputs.
Programming the Trip Voltage (V TRIP )
Two external resistors set the trip voltage, V TRIP (Figure 5).
V TRIP is the point at which the applied voltage (typically
V CC ) toggles OUT. The MAX6457/MAX6458/MAX6459/
MAX6460’s high input impedance allows large-value
resistors without compromising trip-voltage accuracy.
To minimize current consumption, select a value for R2
between 10k ? and 1M ? , then calculate R1 as follows:
? V ?
? V TH ?
? V ?
? V REFD ?
where V REF = reference output voltage (2.25V, typ),
V REFD = divided reference, V TRIP = desired trip thresh-
old in (in volts).
For an active-low power-good output, connect the
resistor divider R1 and R2 to the inverting input and the
reference-divider network to the noninverting input.
Alternatively, connect an external reference less than
1.4V to either input.
V TRIP
V CC
V CC
R PULLUP
R1
V CC
R PULLUP
R1
MAX6457–
IN+
R2
IN+
MAX6460
OUT
(OUTA FOR
MAX6459)
OUT
(OUTA)
R2
R3
REF
MAX6460
OUT
OUT
GND
V REFD
IN-
V TRIP = V TH
R1 + R2
R2
R4
GND
Figure 5a. Programming the Trip Voltage
Figure 5b. Programming the MAX6460 Trip Voltage
where V TRIP = desired trip voltage (in volts), V TH =
threshold trip voltage (V TH + for overvoltage detection
or V TH - for undervoltage detection).
Use the MAX6460 voltage reference (REF) to set the
trip threshold by connecting IN+ or IN- through a volt-
V IN+
V TH+
V TH-
V HYST
age divider (within the inputs common-mode voltage
range) to REF. Do not connect REF directly to IN+ or
IN- since this violates the input common-mode voltage
range. Small leakage currents into the comparators
inputs allows use of large value resistors to prevent
V OUT
V CC
loading the reference and affecting its accuracy. Figure
0
t TP
t TP
5b shows an active-high power-good output. Use the
following equation to determine the resistor values
when connecting REF to IN-:
8
Figure 6. Input and Output Waveforms (Noninverting Input Varied)
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6457UKD3C | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LOW-CURRENT VOLTAGE M - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6457UKD3C+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 5PIN SOT-23 - Rail/Tube |
| MAX6457UKD3C+T | 功能描述:监控电路 Single Low C/V Voltage Monitor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6457UKD3C-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6458UKD0A | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LOW-CURRENT VOLTAGE M - Cut Tape Product |
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