Overview
The LM1086CSX-3.3/NOPB is a 1.5-A low dropout positive voltage regulator produced by Texas Instruments. This device is part of the LM1086 series, which is known for its high performance and versatility. The LM1086CSX-3.3/NOPB is specifically configured to provide a fixed output voltage of 3.3V. It features a maximum dropout of 1.5V at 1.5A of load current and has the same pin-out as TI's industry standard LM317. This regulator includes current limiting, thermal protection, and a zener-trimmed bandgap reference, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 3.3 | V |
| Output Current | 1.5 | A |
| Maximum Input Voltage | 29 | V |
| Dropout Voltage | 1.5 | V |
| Line Regulation | 0.015% | |
| Load Regulation | 0.1% | |
| Output Accuracy | 2% | |
| Temperature Range | -40°C to 125°C | |
| Package Type | TO-263-4, D²PAK (3 leads + tab) | |
| Ripple Rejection | 60 dB @ 120 Hz |
Key Features
- Fixed output voltage of 3.3V or adjustable versions available
- Current limiting and thermal protection
- 2% output accuracy
- Line regulation of 0.015% (typical) and load regulation of 0.1% (typical)
- Maximum input voltage up to 29V
- Stable with ceramic output capacitors with appropriate ESR
- Ripple rejection of 60 dB @ 120 Hz
- Temperature range: -40°C to 125°C
Applications
- High-efficiency linear regulators
- Battery chargers
- Post-regulation for switching supplies
- Constant current regulators
- Microprocessor supplies
- Audio amplifier supplies
- Fire alarm control systems
Q & A
- What is the maximum output current of the LM1086CSX-3.3/NOPB?
The maximum output current is 1.5 A.
- What is the dropout voltage of the LM1086CSX-3.3/NOPB at 1.5 A of load current?
The dropout voltage is 1.5 V.
- What is the maximum input voltage for the LM1086CSX-3.3/NOPB?
The maximum input voltage is 29 V.
- What is the output voltage accuracy of the LM1086CSX-3.3/NOPB?
The output voltage accuracy is 2%.
- What are the typical line and load regulations for the LM1086CSX-3.3/NOPB?
The typical line regulation is 0.015%, and the typical load regulation is 0.1%.
- What is the temperature range for the LM1086CSX-3.3/NOPB?
The temperature range is -40°C to 125°C.
- What types of capacitors are recommended for stability with the LM1086CSX-3.3/NOPB?
Ceramic, solid tantalum, or aluminum electrolytic capacitors are recommended, with specific ESR values for stability.
- Can the LM1086CSX-3.3/NOPB be used as a constant current regulator?
- What are some common applications for the LM1086CSX-3.3/NOPB?
Common applications include high-efficiency linear regulators, battery chargers, post-regulation for switching supplies, and microprocessor supplies.
- How does the ripple rejection of the LM1086CSX-3.3/NOPB change with adjustment voltage?
The ripple rejection decreases as the adjustment voltage increases, but this can be compensated by bypassing the adjust terminal with a capacitor.
