The Texas Instruments LM140K - 15 is a three - terminal positive voltage regulator. It can stably output 15V with an output voltage tolerance of ±4% at (Tj=25∘C) under a 1A load. It has multiple protection mechanisms like thermal overload, short - circuit current limiting, and output transistor safety area protection. This regulator is suitable for local voltage regulation on circuit boards, fixed - voltage power supply in devices needing 15V, and can be adjusted with external components for different voltage/current needs. It can handle high - current applications, providing over 1A of output current with proper heat dissipation.
Texas Instruments LM140K-15's Features
The LM140K - 15 is a three-terminal positive voltage regulator introduced by Texas Instruments, which has the following characteristics:
High Load Capacity and Precise Voltage Regulation: It has complete specification parameters under a 1A load. When the junction temperature: Tj=25∘C, the output voltage tolerance is controlled within ±4%, and it can stably output a voltage of 15V, which can meet the requirements of various circuits with high voltage accuracy.
Multiple Protection Mechanisms: It integrates internal thermal overload protection, internal short-circuit current limiting, and output transistor safe area protection functions. When the chip temperature is too high, a short circuit occurs, or the output transistor operates beyond the safe range, the protection mechanism will be activated to prevent the chip from being damaged, enhancing the stability and reliability of the circuit.
Product Enhancement Testing: It has undergone P + product enhancement testing and has been strictly inspected in terms of performance and quality. Compared with ordinary products, it may perform better in aspects such as stability and anti-interference ability, and can be applied to occasions with high requirements for component performance and reliability.
Flexible Application Features: In addition to being used as a 15V fixed voltage regulator, it can also be used in combination with external components to achieve adjustments of the output voltage and current, expanding the application scenarios. In some circuits that require different voltage or current outputs, external components such as resistors can be used to flexibly configure the output parameters according to relevant formulas.
Simple Design for Use: The entire series of regulators is designed to simplify the usage process and reduce the number of external components. Under normal circumstances, a bypass capacitor is not required at the output terminal (although a bypass capacitor can improve the transient response); only when the regulator is far from the power supply filter capacitor, a bypass is required at the input terminal, reducing the complexity and cost of the circuit design.
Texas Instruments LM140K-15's Applications
The LM140K - 15 from Texas Instruments is a three-terminal positive voltage regulator that is widely used in various electronic circuit scenarios, as follows:
Local (On-board) Voltage Regulation: It can effectively eliminate the noise and distribution problems caused by single-point regulation and provide a stable 15V voltage for specific circuits on the board. In complex circuit boards, different chips have different power supply requirements. The LM140K - 15 can precisely supply power to specific chips or modules. For example, on a computer motherboard, it can provide a stable power source for some chips that have high requirements for voltage stability, avoiding the impact of voltage fluctuations on their performance and stability.
Fixed Voltage Power Supply: In many circuits that require a fixed 15V voltage output, it can be directly used as a power voltage regulator. For instance, some sensors in industrial control equipment, specific modules of communication devices, etc. These devices have high requirements for power supply stability. With its output voltage tolerance of ±4% (when Tj=25∘C ), the LM140K - 15 can provide a stable and reliable 15V power supply for these devices to ensure their normal operation.
Adjustable Voltage and Current Circuits: By matching with external components, the adjustment of the output voltage and current can be achieved. According to the formula (VOUT= 5V +(5V /R1 + IQ)R2 (5V/R1 > 3) changing the values of the external resistors R1 and R2 can adjust the output voltage. In experimental circuits and the development of customized electronic devices, this adjustable feature meets different voltage and current requirements and enhances the flexibility of circuit design.
High Current Applications: Under sufficient heat dissipation conditions, it can provide an output current of more than 1A, which is suitable for loads with large current requirements. For example, some power amplifiers, small motor drive circuits, etc. It can provide sufficient power support for these loads to ensure their normal operation.
Combined Applications in Various Complex Circuits: In the actual design of electronic systems, it is often used in combination with other circuit components. In some circuits that require both positive and negative voltages to be provided simultaneously, it can cooperate with other negative voltage regulators. In circuits that are sensitive to power supply noise, it can be used in combination with bypass capacitors to improve the transient response and reduce the impact of power supply noise on the circuit.
Texas Instruments LM140K-15's Attributes
| Output options |
Fixed Output |
Iout (max) (A) |
1 |
| Vin (max) (V) |
35 |
Vin (min) (V) |
17.6 |
| Vout (max) (V) |
15 |
Vout (min) (V) |
5 |
| Fixed output options (V) |
5, 12, 15 |
Noise (µVrms) |
40 |
| Iq (typ) (mA) |
7 |
Thermal resistance θJA (°C/W) |
39 |
| Rating |
Military |
Load capacitance (min) (µF) |
0 |
| Regulated outputs (#) |
1 |
Accuracy (%) |
4 |
| PSRR at 100 KHz (dB) |
50 |
Dropout voltage (Vdo) (typ) (mV) |
2500 |
| Operating temperature range (°C) |
-55 to 125 |
|
|
Texas Instruments LM140K-15's Category- LDO Voltage Regulators ICS
LDO (Low Dropout Linear Regulator) integrated circuits are indispensable power management components in modern electronic devices. Compared with traditional linear regulators, LDOs can operate normally even when the voltage difference between the input and output is extremely small. Their working principle is based on an internal feedback circuit. Through precise control, transistors or field-effect transistors (FETs) in the linear region are used to subtract the excess part from the input voltage, thereby generating a stable output voltage. LDOs have numerous advantages. In terms of cost, their design is relatively simple, and they require few external components. Usually, only one or two bypass capacitors are needed, which reduces the overall cost. In terms of noise control, LDOs perform excellently. They can effectively reduce the power output noise and provide a pure power supply for circuits that are sensitive to noise. For example, they are widely used in audio and radio frequency circuits. The characteristic of low quiescent current enables LDOs to reduce their own power consumption in battery-powered devices, thereby extending the battery life. This advantage is particularly obvious in portable electronic devices. The application fields of LDOs are extremely extensive. In mobile devices such as mobile phones and tablets, LDOs provide stable low-voltage power supplies for chips to ensure the stable operation of the devices. On computer motherboards, LDOs provide precise voltage regulation for different chip modules, avoiding performance degradation caused by voltage fluctuations. In communication base station equipment, LDOs ensure that the signal processing circuits work under stable voltage conditions, guaranteeing the communication quality.
Although Texas Instruments' LM140K-15 is not a typical LDO (it is a three-terminal positive voltage regulator), it has similarities in function with LDOs and can also provide a stable voltage output. The LM140K-15 can output a precise 15V voltage, has a high load capacity, and can maintain good performance under a 1A load. It also has a complete protection mechanism, such as thermal overload protection and short-circuit current limitation. In circuit scenarios that require a stable 15V power supply, it can, like an LDO, provide a reliable power supply guarantee for the load, ensuring the stable and efficient operation of the circuit.
LM140LAH-12 vs LM140K-15
| |
 |
 |
| Part number and picture |
LM140LAH-12 +BOM |
LM140K-15 +BOM |
| Manufacturer |
Texas Instruments |
Texas Instruments |
| Package |
TO-3 |
TO-CAN (NDS)-2 |
| Description |
Linear Voltage Regulator IC Positive
Fixed 1 Output 100mA TO-3 |
This product ensures stable output |
| Stock |
12099 |
6378 |
| Output options |
Fixed Output |
Fixed Output |
| Maximum Continuous Drain Current (A) |
0.1 |
1 |
| Vin (max) (V) |
35 |
35 |
| Vin (min) (V) |
17.6 |
17.6 |
| Vout (max) (V) |
15 |
15 |
| Vout (min) (V) |
5 |
5 |
| Fixed output options (V) |
5, 12, 15 |
5, 12, 15 |
| Noise (µVrms) |
40 |
40 |
| Iq (typ) (mA) |
4.5 |
7 |
| Thermal resistance θJA (°C/W) |
26 |
39 |
| Rating |
Military |
Military |
| Load capacitance (min) (µF) |
0 |
0 |
| Regulated outputs (#) |
1 |
1 |
| Accuracy (%) |
4 |
4 |
| PSRR at 100 KHz (dB) |
40 |
50 |
| Dropout voltage (Vdo) (typ) (mV) |
1500 |
2500 |
| Operating temperature range (°C) |
-55 to 125 |
-55 to 125 |
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