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線性與低壓差 (LDO) 穩壓器

LM317M

現行

500-mA、40-V、可調整線性電壓穩壓器

立即訂購
產品規格表

LM317M

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Vin (max) (V) 40 Vin (min) (V) 3.75 Iout (max) (A) 0.5 Output options Adjustable Output Vout (max) (V) 37 Vout (min) (V) 1.2 Noise (µVrms) 38 PSRR at 100 KHz (dB) 22 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 60 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
Rating Catalog Vin (max) (V) 40 Vin (min) (V) 3.75 Iout (max) (A) 0.5 Output options Adjustable Output Vout (max) (V) 37 Vout (min) (V) 1.2 Noise (µVrms) 38 PSRR at 100 KHz (dB) 22 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 60 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
SOT-223 (DCY) 4 45.5 mm² (6.5 mm × 7 mm) TO-252 (KVU) 3 66.726 mm² (6.6 mm × 10.11 mm)
  • LM317MQ (new chip) AEC-Q100 qualified for automotive applications
    • Temperature grade 2: –40°C ≤ TA ≤ 105°C
  • Adjustable output voltage range (VOUT): 1.25V to 37V
  • Output current (IOUT): Up to 500mA
  • Built-in, short-circuit current limiting and thermal protection
  • Stable without any output capacitor
  • Operating junction temperature: –40°C to +125°C
  • Packages:
    • 4-pin, 6.5mm × 7mm SOT-223 (RθJA[new chip] : 77.7°C/W)
    • 3-pin, 6.6mm × 10.11mm TO-252 (RθJA[new chip] : 31.7°C/W)
  • LM317MQ (new chip) AEC-Q100 qualified for automotive applications
    • Temperature grade 2: –40°C ≤ TA ≤ 105°C
  • Adjustable output voltage range (VOUT): 1.25V to 37V
  • Output current (IOUT): Up to 500mA
  • Built-in, short-circuit current limiting and thermal protection
  • Stable without any output capacitor
  • Operating junction temperature: –40°C to +125°C
  • Packages:
    • 4-pin, 6.5mm × 7mm SOT-223 (RθJA[new chip] : 77.7°C/W)
    • 3-pin, 6.6mm × 10.11mm TO-252 (RθJA[new chip] : 31.7°C/W)

The LM317M and LM317MQ are adjustable floating, positive-voltage regulators capable of supplying an output current of 0.5A over an output voltage range of 1.25V to 37V. The device requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. The device includes current limiting, thermal overload protection, and safe operating area protection.

The device 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 37V at any time. The device can function as a floating current source controlled by a single resistor.

Additionally, the device does not need an output capacitor for stable operation across the load current range. Optionally, the transient performance of the device can be improved using an electrolytic or tantalum output capacitor. Bypass the ADJUST pin with any type of capacitor to achieve high ripple-rejection ratios.

The LM317M and LM317MQ are adjustable floating, positive-voltage regulators capable of supplying an output current of 0.5A over an output voltage range of 1.25V to 37V. The device requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. The device includes current limiting, thermal overload protection, and safe operating area protection.

The device 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 37V at any time. The device can function as a floating current source controlled by a single resistor.

Additionally, the device does not need an output capacitor for stable operation across the load current range. Optionally, the transient performance of the device can be improved using an electrolytic or tantalum output capacitor. Bypass the ADJUST pin with any type of capacitor to achieve high ripple-rejection ratios.

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM317M, LM317MQ Adjustable Floating Regulators datasheet (Rev. R) PDF | HTML 2026/5/7
應用說明 LDO Noise Demystified (Rev. B) PDF | HTML 2020/8/18
應用說明 LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 2017/8/9
應用說明 Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 2013/5/5
應用說明 A New Production Technique for Trimming Voltage Regulators 2002/10/3
應用說明 Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems 2002/10/3

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開發板

MLTLDO2EVM-037 — 適用於 DCY、DDA 和 KVU 封裝的通用 LDO 線性電壓穩壓器評估模組

MLTLDO2EVM-037 多重封裝低壓差 (LDO) 評估模組 (EVM) 可讓設計工程師評估多種常用線性穩壓器封裝的運作情形及性能，以利在自己的電路應用中使用。此 EVM 配置包含 DDA、3 針腳和 5 針腳 KVU，以及用於工程師焊接和評估其零件的 DCY 封裝板上配置。

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SOT-223 (DCY) 4 Ultra Librarian
TO-252 (KVU) 3 Ultra Librarian
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