Overview
The LM1084IS-3.3/NOPB is a 5A low dropout positive voltage regulator produced by Texas Instruments. This regulator is known for its high current capability and low dropout voltage, making it suitable for a variety of applications requiring stable and efficient voltage regulation. The LM1084 has the same pinout as the industry-standard LM317 and is available in fixed output voltages, including 3.3V, as well as an adjustable version. It features current limiting, thermal protection, and a wide operating temperature range from -40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 3.3 | V |
| Output Current | 5 | A |
| Input Voltage Range | 2.6 to 29 | V |
| Dropout Voltage | 1.3 to 1.5 | V |
| Line Regulation | 0.015% (typical) | % |
| Load Regulation | 0.1% (typical) | % |
| Operating Temperature Range | -40 to 125 | °C |
| Maximum Junction Temperature | 150 | °C |
| Quiescent Current | 5 to 10 | mA |
| Ripple Rejection | 60 to 75 | dB |
Key Features
- High output current capability of up to 5A
- Low dropout voltage of 1.3V to 1.5V at full load
- Current limiting and thermal protection for enhanced reliability
- Wide operating temperature range from -40°C to 125°C
- High line and load regulation: 0.015% and 0.1% respectively
- Low quiescent current, typically 5 to 10 mA
- High ripple rejection, typically 60 to 75 dB
- Available in fixed and adjustable output voltage versions
Applications
- Post regulator for switching DC/DC converters
- High-efficiency linear regulators
- Battery chargers
- Constant voltage and constant current applications
- Generating negative supply voltage
- Remote sensing for precise voltage regulation
Q & A
- What is the maximum output current of the LM1084IS-3.3/NOPB?
The maximum output current is 5A. - What is the dropout voltage of the LM1084IS-3.3/NOPB?
The dropout voltage is 1.3V to 1.5V at full load. - What is the operating temperature range of the LM1084IS-3.3/NOPB?
The operating temperature range is -40°C to 125°C. - Does the LM1084IS-3.3/NOPB have current limiting and thermal protection?
Yes, it includes current limiting and thermal protection. - What are the typical line and load regulations of the LM1084IS-3.3/NOPB?
The typical line regulation is 0.015%, and the typical load regulation is 0.1%. - What is the quiescent current of the LM1084IS-3.3/NOPB?
The quiescent current is typically 5 to 10 mA. - What is the ripple rejection of the LM1084IS-3.3/NOPB?
The ripple rejection is typically 60 to 75 dB. - Can the LM1084IS-3.3/NOPB be used as a battery charger?
Yes, it can be used as a battery charger to regulate the charging current. - How can the LM1084IS-3.3/NOPB be used to generate a negative supply voltage?
By tying the output to GND, the GND node can be at a relatively more negative potential than the output, thus generating a negative supply voltage. - What is remote sensing in the context of the LM1084IS-3.3/NOPB?
Remote sensing is a method of compensating the output voltage to a precise degree by sensing the output and feeding it back through the feedback circuit.
