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線性與低壓差 (LDO) 穩壓器

LM317MQ

現行

適用汽車應用的 500-mA、40-V 可調式線性電壓穩壓器

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產品規格表

LM317MQ

現行
產品規格表 立即訂購

產品詳細資料

Rating Automotive Vin (max) (V) 37, 40 Vin (min) (V) 2.5, 3 Iout (max) (A) 0.5 Output options Adjustable Output, Fixed Output Vout (max) (V) 37 Vout (min) (V) 1.25 Noise (µVrms) 38 PSRR at 100 KHz (dB) 22 Iq (typ) (mA) 3.5 Thermal resistance θJA (°C/W) 60 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 2 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
Rating Automotive Vin (max) (V) 37, 40 Vin (min) (V) 2.5, 3 Iout (max) (A) 0.5 Output options Adjustable Output, Fixed Output Vout (max) (V) 37 Vout (min) (V) 1.25 Noise (µVrms) 38 PSRR at 100 KHz (dB) 22 Iq (typ) (mA) 3.5 Thermal resistance θJA (°C/W) 60 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 2 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
SOT-223 (DCY) 4 45.5 mm² 6.5 x 7
  • 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 temperature range: –40°C to +125°C
  • Packages:
    • 4-pin, 6.5mm × 7mm SOT-223 (RθJA : 77.7°C/W)
    • 3-pin, 6.6mm × 10.11mm TO-252 (RθJA : 31.7°C/W)
  • 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 temperature range: –40°C to +125°C
  • Packages:
    • 4-pin, 6.5mm × 7mm SOT-223 (RθJA : 77.7°C/W)
    • 3-pin, 6.6mm × 10.11mm TO-252 (RθJA : 31.7°C/W)

The LM317M and LM317MQ are adjustable three-pin, 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 40V at any time. The device functions 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, add an electrolytic or tantalum output capacitor to improve transient response. Ceramic output capacitors are available, but output ringing is potentially present on transients. Bypass the ADJUST pin with any type of capacitor to achieve high ripple-rejection ratios.

The LM317M and LM317MQ are adjustable three-pin, 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 40V at any time. The device functions 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, add an electrolytic or tantalum output capacitor to improve transient response. Ceramic output capacitors are available, but output ringing is potentially present on transients. Bypass the ADJUST pin with any type of capacitor to achieve high ripple-rejection ratios.

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LM317M 現行 500-mA、40-V、可調整線性電壓穩壓器 Pin-to-pin equivalent for industrial applications

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類型 標題 日期
* Data sheet LM317M, LM317MQ 3-Pin Adjustable Regulators datasheet (Rev. Q) PDF | HTML 2025年 7月 25日
Application note LDO Noise Demystified (Rev. B) PDF | HTML 2020年 8月 18日
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 2017年 8月 9日

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開發板

LM317A-337N-EVM — 3 針腳可調整穩壓器評估模組

LM317A-337N-EVM 展示了 LM317A 可調整穩壓器及其負補數 LM337-N 的規範應用。評估模組 (EVM) 透過每個裝置的 SOT-223 封裝選項進行評估，可提供高達 1A 的負載電流。EVM 設計便於輕鬆修改，可安裝 TO-220 版本的裝置以實現 1.5A 的工作電壓。此 EVM 擁有足夠的佔用空間供選擇個人電容器，以及 4 銅層和散熱器空間，可實現絕佳功耗。

使用指南: PDF
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SOT-223 (DCY) 4 Ultra Librarian
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