LM317MQ集成电路（IC）的线性+开关稳压器规格书PDF中文资料

LM317MQ属于集成电路（IC）的线性+开关稳压器。由德州仪器制造生产的LM317MQ稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。

1 Features

1• Output Voltage Range Adjustable

from 1.25-V to 37-V

• Output Current Greater Than 500-mA

• Internal Short-Circuit Current Limiting

• Thermal-Overload Protection

• Output Safe-Area Compensation

• Q Devices Meet Automotive Performance

Requirements

• Customer-Specific Configuration Control Can Be

Supported for Q Devices Along With

Major-Change Approval

2 Applications

• Electronic Point-of-Sales

• Medical/Health/Fitness Applications

• Printers

• Appliances/White Goods

• TV/Set-Top Box

3 Description

The LM317M is an adjustable 3-terminal positive

voltage regulator capable of supplying more than

500-mA over an output-voltage range of 1.25-V to

37-V. The LM317M is exceptionally easy to use and

requires only two external resistors to set the output.

Furthermore, both line and load regulation are better

than standard fixed regulators.

In addition to having higher performance than fixed

regulators, the LM317M includes on-chip current

limiting, thermal-overload protection, and safe-

operating-area protection. All overload protection

remains fully functional if the ADJUST terminal is

disconnected.

The LM317 is a floating regulator meaning there is no device ground terminal. Quiescent current flows to

the load instead of being wasted flowing to ground.

Regulated output voltage of hundreds of volts is

possible if the maximum input to output differential does not exceed 40-V at any time. Device can be

used as a floating current source controlled by a

single resistor.

Normally, no capacitors are needed unless the device

is more than six inches from the input filter

capacitors, in which case an input bypass capacitor

of any type is needed. An optional electrolytic or

tantalum output capacitor can be added to improve

transient response. Ceramic output capacitors can be

used but output ringing may be present on transients.

The ADJUST terminal can be bypassed with any type

of capacitor to achieve high ripple-rejection ratios,

which are difficult to achieve with standard threeterminal

regulators.