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 three-terminal regulators.

• 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

• Output options
• Adjustable Output
• Iout (Max) (A)
• 0.5
• Vin (Max) (V)
• 40
• Vin (Min) (V)
• 3
• Vout (Max) (V)
• 37
• Vout (Min) (V)
• 1.2
• Noise (uVrms)
• 38
• Iq (Typ) (mA)
• 3.5
• Thermal resistance θJA (°C/W)
• 60
• Rating
• Automotive
• Load capacitance (Min) (μF)
• 0
• Regulated outputs (#)
• 1
• Features
• —
• Accuracy (%)
• 2
• PSRR @ 100 KHz (dB)
• 22
• Dropout voltage (Vdo) (Typ) (mV)
• 2000
• Operating temperature range (C)
• -40 to 125

LM317MQ的完整型号有：LM317MQDCYR、LM317MQDCYRG4，以下是这些产品的关键参数及官网采购报价：

LM317MQDCYR，工作温度：-40 to 125，封装：SOT-223 (DCY)-4，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网LM317MQDCYR的批量USD价格：.18（1000+）

LM317MQDCYRG4，工作温度：-40 to 125，封装：SOT-223 (DCY)-4，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网LM317MQDCYRG4的批量USD价格：.315（1000+）

LM317A-337N-EVM — 3 引脚可调节稳压器评估模块

LM317A-337N-EVM 演示了 LM317A 可调稳压器及其负向互补稳压器 LM337-N 的典型应用。此评估模块为每个器件采用 SOT-223 封装选项，提供高达 1.0A 的负载电流。此 EVM 可轻松修改以填充 TO-220 版器件，从而适应 1.5A 工作电流。此模块提供了足量的占用空间供客户选择电容，还具有 4 个铜层和散热空间以实现出色的功耗。