LM309

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采用气密封装的 1A 5V 输出线性稳压器/LDO

产品详情

Output options Fixed Output Iout (max) (A) 1 Vin (max) (V) 35 Vin (min) (V) 7.1 Vout (max) (V) 5 Vout (min) (V) 5 Fixed output options (V) 5 Noise (µVrms) 40 Iq (typ) (mA) 5.2 Thermal resistance θJA (°C/W) 35 Rating Military Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 5 PSRR at 100 KHz (dB) 64 Dropout voltage (Vdo) (typ) (mV) 1950 Operating temperature range (°C) 0 to 125
Output options Fixed Output Iout (max) (A) 1 Vin (max) (V) 35 Vin (min) (V) 7.1 Vout (max) (V) 5 Vout (min) (V) 5 Fixed output options (V) 5 Noise (µVrms) 40 Iq (typ) (mA) 5.2 Thermal resistance θJA (°C/W) 35 Rating Military Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 5 PSRR at 100 KHz (dB) 64 Dropout voltage (Vdo) (typ) (mV) 1950 Operating temperature range (°C) 0 to 125
TO-CAN (NDS) 2 969.2166 mm² 38.94 x 24.89 TO-CAN (NDT) 3 91.6742 mm² 10.03 x 9.14
  • Specified to be compatible, worst case, with TTL and DTL
  • Output current in excess of 1A
  • Internal thermal overload protection
  • No external components required

  • Specified to be compatible, worst case, with TTL and DTL
  • Output current in excess of 1A
  • Internal thermal overload protection
  • No external components required

The LM109 series are complete 5V regulators fabricated on a single silicon chip. They are designed for local regulation on digital logic cards, eliminating the distribution problems association with single-point regulation. The devices are available in two standard transistor packages. In the solid-kovar TO-5 header, it can deliver output currents in excess of 200 mA, if adequate heat sinking is provided. With the TO-3 power package, the available output current is greater than 1A.

The regulators are essentially blowout proof. Current limiting is included to limit the peak output current to a safe value. In addition, thermal shutdown is provided to keep the IC from overheating. If internal dissipation becomes too great, the regulator will shut down to prevent excessive heating.

Considerable effort was expended to make these devices easy to use and to minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response somewhat. Input bypassing is needed, however, if the regulator is located very far from the filter capacitor of the power supply. Stability is also achieved by methods that provide very good rejection of load or line transients as are usually seen with TTL logic.

Although designed primarily as a fixed-voltage regulator, the output of the LM109 series can be set to voltages above 5V, as shown. It is also possible to use the circuits as the control element in precision regulators, taking advantage of the good current-handling capability and the thermal overload protection.


The LM109 series are complete 5V regulators fabricated on a single silicon chip. They are designed for local regulation on digital logic cards, eliminating the distribution problems association with single-point regulation. The devices are available in two standard transistor packages. In the solid-kovar TO-5 header, it can deliver output currents in excess of 200 mA, if adequate heat sinking is provided. With the TO-3 power package, the available output current is greater than 1A.

The regulators are essentially blowout proof. Current limiting is included to limit the peak output current to a safe value. In addition, thermal shutdown is provided to keep the IC from overheating. If internal dissipation becomes too great, the regulator will shut down to prevent excessive heating.

Considerable effort was expended to make these devices easy to use and to minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response somewhat. Input bypassing is needed, however, if the regulator is located very far from the filter capacitor of the power supply. Stability is also achieved by methods that provide very good rejection of load or line transients as are usually seen with TTL logic.

Although designed primarily as a fixed-voltage regulator, the output of the LM109 series can be set to voltages above 5V, as shown. It is also possible to use the circuits as the control element in precision regulators, taking advantage of the good current-handling capability and the thermal overload protection.


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类型 标题 下载最新的英语版本 日期
* 数据表 LM109/LM309 5-Volt Regulator 数据表 (Rev. A) 2004年 5月 3日
应用手册 A Topical Index of TI LDO Application Notes (Rev. F) 2019年 6月 27日
应用手册 AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) 2013年 5月 6日
应用手册 AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) 2013年 5月 6日
应用手册 AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) 2013年 5月 5日
应用手册 Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 2013年 5月 5日
应用手册 Packaging Limits Range of Linear Regulators 2010年 5月 8日
应用手册 Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 2008年 6月 4日
应用手册 Linear and Switching Voltage Regulator Fundamental Part 1 2007年 3月 21日
应用手册 Understanding the Terms and Definitions of LDO Voltage Regulators 1999年 10月 21日

设计和开发

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封装 引脚 下载
TO-CAN (NDS) 2 查看选项
TO-CAN (NDT) 3 查看选项

订购和质量

包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

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