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参数资料
| 型号： | MAX4505EUK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC SIGNAL LINE PROTECTOR SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 过压防护 |
| 应用： | 控制系统 |
| 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： | 1420 (CN2011-ZH PDF) |
| 其它名称： | MAX4505EUK+TDKR |
Fault Protection with Power Off
When power is off (i.e., V+ = V- = 0), the protector is a
virtual open circuit. The output stays at 0 with up to
±40V applied to the input.
Fault Protection with Power On
A fault condition exists when the voltage on AIN
exceeds either supply rail. This definition is valid when
power is on or off, as well as during all states while
power ramps up or down.
Applications Information
Supplying Power Through External ICs
The MAX4505 has low supply current (<250A), which
allows the supply pins to be driven by other active cir-
cuitry instead of connected directly to the power
sources. In this configuration, the part can be used as a
driven fault-protected switch with V+ or V- used as the
control pins. For example, with the V- pin grounded, the
output of a CMOS gate can drive the V+ pin to turn the
device on and off. Ensure that the driving source(s)
does not drive the V+ pin more negative than the V- pin.
Protector as Circuit Elements
Figure 3 shows a MAX4505 used in front of a MAX338
unprotected 1-to-8 multiplexer. With supplies at ±15V,
VAOUT of the MAX4505 clamps to ±15V and VOUT of
the MAX338 goes to ±14V. With supplies off, VAOUT
goes to 0 even though the input remains at ±25V.
Multiplexer and Demultiplexer
The MAX4505 can be used in series with the output of a
MAX4508 (1-to-8 multiplexer) to act as multiplexer or
demultiplexer. The MAX4508 is a fault-protected multi-
plexer whose inputs are designed to interface with harsh
environments; however, its common output is not fault
protected if connected to outside signals (i.e., demulti-
plexer use). If the common output can see fault signals,
then it needs to be protected, and the MAX4505 can be
added to provide complete protection.
As seen in Figure 4, the signal input can now be put
into pin 3 of the MAX4505 (new common output for sys-
tem), and outputs can be taken at MAX4508 pins 4 to
7, and 9 to 12. This is the classic demultiplexer opera-
tion. This system now has full protection on both of the
multiplexers’ inputs and outputs.
Measuring Path Resistance
Measuring path resistance requires special techniques,
since path resistance varies dramatically with the AIN
and AOUT voltages relative to the supply voltages. Do
not use conventional ohmmeters. Their applied voltage
and currents are usually unpredictable. The true resis-
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
_______________________________________________________________________________________
7
MAX4505
ROUT
VIN
AIN
V-
V+
AOUT
Figure 2. Application Circuit
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
MAX338
-15V
1
2
8
7
+15V
+25V
3
4
6
5
MAX4505
A1
A2
GND
V+
NO5
NO6
NO7
NO8
AO
EN
V-
OV
+5V
+3V
+15V
-5V
NO3
NO1
NO2
NO4
VOUT
Figure 3. Protecting a MAX338 with a MAX4505
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
MAX4508
-15V
1
2
8
7
+15V
NEW COM
3
4
6
5
MAX4505
A1
A2
GND
V+
NO5
NO6
NO7
NO8
AO
EN
V-
O
+5V
+3V
+15V
-15V
NO3
NO1
NO2
NO4
COM
Figure 4. Demultiplexer Application Using MAX4505
with MAX4508
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4506C/D | 功能描述:模拟开关 IC Fault-Protected High Voltage Signal-Line Protectors RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4506C/D+ | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4506CPA | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4506CSA | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4506CSA+ | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
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