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参数

Output options Adjustable Output Iout (Max) (A) 1.5 Vin (Max) (V) 40 Vin (Min) (V) 4.2 Vout (Max) (V) 37 Vout (Min) (V) 1.25 Noise (uVrms) 75 Iq (Typ) (mA) 5 Thermal resistance θJA (°C/W) 39 Load capacitance (Min) (µF) 0 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 4 PSRR @ 100 KHz (dB) 40 Dropout voltage (Vdo) (Typ) (mV) 1200 Operating temperature range (C) -55 to 150, -55 to 125 open-in-new 查找其它 线性稳压器(LDO)

封装|引脚|尺寸

TO-CAN (NDS) 2 969 mm² 38.94 x 24.89 TO-CAN (NDT) 3 92 mm² 10.03 x 9.14 open-in-new 查找其它 线性稳压器(LDO)

特性

  • For a newer drop-in alternative, see the LM317
  • Typ. 0.1% load regulation
  • Typ. 0.01%/V line regulation
  • 1.5-A output current
  • Adjustable output down to 1.25 V
  • Current limit constant with temperature
  • 80-dB ripple rejection
  • Short-circuit protected output
  • −55°C to 150°C operating temperature range (LM117)

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open-in-new 查找其它 线性稳压器(LDO)

描述

The LM117 and LM317-N series of adjustable 3-pin positive voltage regulators are capable of supplying in excess of 1.5 A over a 1.25-V to 37-V output range and a wide temperature range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators.

The LM117 and LM317-N offer full overload protection such as current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios that are difficult to achieve with standard 3-terminal regulators.

Because the regulator is floating and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. That is, avoid short-circuiting the output.

By connecting a fixed resistor between the adjustment pin and output, the LM117 and LM317-N can be also used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground, which programs the output to 1.25 V where most loads draw little current.

For applications requiring greater output current, see the LM150 series (3 A) and LM138 series (5 A) data sheets. For the negative complement, see the LM137 series data sheet.

open-in-new 查找其它 线性稳压器(LDO)
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LM2941 正在供货 具有使能功能的 1A、26V、高 PSRR、可调节低压降稳压器,-40°C°C 至 +125°C 工作温度范围 This product is a lower dropout (500mV), 1-A LDO regulator.

技术文档

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类型 标题 下载最新的英文版本 日期
* 数据表 LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator 数据表 2020年 6月 10日
应用手册 A Topical Index of TI LDO Application Notes 2019年 6月 27日
技术文章 LDO basics: capacitor vs. capacitance 2018年 8月 1日
技术文章 LDO Basics: Preventing reverse current 2018年 7月 25日
技术文章 LDO basics: introduction to quiescent current 2018年 6月 20日
技术文章 LDO basics: noise – part 1 2017年 6月 14日
选择指南 TI Components for Aerospace and Defense Guide 2017年 3月 22日
应用手册 AN-1028 Maximum Power Enhancement Techniques for Power Packages 2013年 5月 6日
应用手册 AN-103 LM340 Series Three Terminal Positive Regulators 2013年 5月 6日
应用手册 AN-1148 Linear Regulators: Theory of Operation and Compensation 2013年 5月 6日
应用手册 AN-178 Applications for an Adjustable IC Power Regulator 2013年 5月 5日
应用手册 AN-182 Improving Power Supply Reliability with IC Power Regulators 2013年 5月 5日
应用手册 Method For Cal Output Voltage Tolerances in Adj Regs 2013年 5月 5日
应用手册 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise 2013年 5月 5日
应用手册 Packaging Limit Ranges of Linear Regulators 2010年 5月 8日
应用手册 Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) 2008年 6月 4日
应用手册 A New Production Technique for Trimming Voltage Regulators 2002年 10月 3日
应用手册 High Voltage Adjustable Power Supplies 2002年 10月 3日
应用手册 Understanding the Terms and Definitions of LDO Voltage Regulators 1999年 10月 21日

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