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参数资料
| 型号： | MAX638 |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 48V-to-5V DC-DC Converter Using MAX638 Switching Step-Down Regulator Borrows Power from Phone Lines |
| 中文描述： | 5V/可调、CMOS、降压型、开关稳压器 |
| 文件页数： | 1/4页 |
| 文件大小： | 36K |
| 代理商： | MAX638 |
POWER-SUPPLY CIRCUITS
Apr 30, 1999
48V-to-5V DC-DC Converter Using MAX638
Switching Step-Down Regulator Borrows Power
from Phone Lines
The telephone subscriber lines provide -48V voltage, but the equipment on
the customer premises is usually operated from a lower voltage. The circuit
using MAX638 illustrates a conversion of this available voltage to 5V
required in modems, telephone test sets, and other portable systems
connected to subscriber (household) telephone lines.
This circuit
(Figure 1)
is not battery-powered in the usual sense. Its power comes from a -
48V lead-acid battery in a remote central office of the telephone system. The circuit is handy
for use in modems, telephone test sets, and other portable systems connected to subscriber
(household) telephone lines. It is also useful in telemetry systems.
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| MAX6380UR33 | 制造商:Maxim Integrated Products 功能描述:3-PIN ULTRA-LOW-POWER SC70 VOLTAG - Cut Tape Product |
| MAX6380UR33+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR DETECT 3.3V 3PIN SOT-23 - Cut Tape Product |
| MAX6380UR33+T | 功能描述:电压监测器/监控器 3-Pin ULow-Power Voltage Detector RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| MAX6380UR33-T | 功能描述:电压监测器/监控器 RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| MAX6380UR34 | 制造商:Maxim Integrated Products 功能描述:3-PIN ULTRA-LOW-POWER SC70 VOLTAG - Cut Tape Product |
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