- 制造厂商：TI
- 产品类别：电源管理
- 技术类目：线性和低压降 (LDO) 稳压器
- 功能描述：采用气密封装的 5A 可调输出线性稳压器/LDO
- 点击这里打开及下载LM138的技术文档资料
- TI代理渠道，提供当日发货、严格的质量标准，满足您的目标价格
The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5 A over a 1.2-V to 32-V output range. They are exceptionally easy to use and require only 2 resistors to set the output voltage. Careful circuit design has resulted in outstanding load and line regulation, comparable to many commercial power supplies. The LM138 family is supplied in a standard 3-lead transistor package.
A unique feature of the LM138 family is time-dependent current limiting. The current limit circuitry allows peak currents of up to 12 A to be drawn from the regulator for short periods of time. This allows the LM138 to be used with heavy transient loads and speeds start-up under full-load conditions. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. Also included on the chip are thermal overload protection and safe area protection for the power transistor. Overload protection remains functional even if the adjustment (ADJ) pin is accidentally disconnected.
Normally, 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 output capacitor can be added to improve transient response, while bypassing the adjustment pin increases the ripple rejection of the regulator.
Besides replacing fixed regulators or discrete designs, the LM138 is useful in a wide variety of other applications. Because the regulator is floating and receives 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; do not short-circuit output to ground. The part numbers in the LM138 series which have a suffix are packaged in a standard steel TO-CAN package, while those with a suffix are packaged in a TO-220 plastic package. The LM138 is rated for TJ = –55°C to 150°C, and the LM338 is rated for TJ = 0°C to 125°C.
- Specified 7-A Peak Output Current
- Specified 5-A Output Current
- Adjustable Output Down to 1.2 V
- Specified Thermal Regulation
- Current Limit Constant With Temperature
- P + Product Enhancement Tested
- Output is Short-Circuit Protected
- Output options
- Adjustable Output
- Iout (Max) (A)
- 5
- Vin (Max) (V)
- 40
- Vin (Min) (V)
- 4.2
- Vout (Max) (V)
- 32
- Vout (Min) (V)
- 1.24
- Noise (uVrms)
- 37
- Iq (Typ) (mA)
- 0.045
- Thermal resistance θJA (°C/W)
- 35
- Rating
- Military
- Load capacitance (Min) (μF)
- 0
- Regulated outputs (#)
- 1
- Features
- —
- Accuracy (%)
- 4
- PSRR @ 100 KHz (dB)
- 10
- Dropout voltage (Vdo) (Typ) (mV)
- 3000
- Operating temperature range (C)
- -55 to 125
LM138的完整型号有：LM138K STEEL、LM138K STEEL/NOPB，以下是这些产品的关键参数及官网采购报价：
LM138K STEEL，工作温度：-55 to 125，封装：TO-3 (NDS)-2，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Call TI，引脚镀层/焊球材料：Call TI，TI官网LM138K STEEL的批量USD价格：62.359（1000+）
LM138K STEEL/NOPB，工作温度：-55 to 125，封装：TO-3 (NDS)-2，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Level-1-NA-UNLIM，引脚镀层/焊球材料：Call TI，TI官网LM138K STEEL/NOPB的批量USD价格：62.359（1000+）
LM138K STEEL，工作温度：-55 to 125，封装：TO-3 (NDS)-2，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Call TI，引脚镀层/焊球材料：Call TI，TI官网LM138K STEEL的批量USD价格：62.359（1000+）
LM138K STEEL/NOPB，工作温度：-55 to 125，封装：TO-3 (NDS)-2，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Level-1-NA-UNLIM，引脚镀层/焊球材料：Call TI，TI官网LM138K STEEL/NOPB的批量USD价格：62.359（1000+）
