Overview
The LT3080IQ#PBF is a 1.1A low dropout linear regulator produced by Analog Devices Inc. This regulator is part of the LT3080 series, known for its high performance and versatility. It can be adjusted using a single resistor and is capable of delivering an output current of up to 1.1A. The LT3080IQ#PBF is particularly useful in applications requiring low dropout voltage and high accuracy, making it suitable for a wide range of electronic systems, including those needing multiple voltage rails and thermal management.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Output Current | 1.1 | A |
| Dropout Voltage | 0.35 | V |
| Output Voltage | Adjustable to 0V | V |
| Input Voltage Range | 1.2 to 36 | V |
| Operating Temperature Range | -40 to 125 | °C |
| Maximum Junction Temperature | 125 | °C |
| PSRR (Power Supply Rejection Ratio) | 30 | dB |
| RMS Noise | 40 | µV (10Hz to 100kHz) |
| Minimum Load Current | 0.5 | mA |
| Line Regulation | <0.001%/V | %/V |
| Load Regulation | <1 mV | mV |
Key Features
- Adjustable output voltage down to 0V using a single resistor.
- Low dropout voltage of 350mV, except for the SOT-223 package.
- High accuracy with 1% initial accuracy of SET pin current.
- Low output noise: 40µVRMS (10Hz to 100kHz).
- Stable with a minimum ceramic output capacitor of 2.2µF.
- Current limit with foldback and overtemperature protection.
- Available in various packages including 8-Lead MSOP, 3mm × 3mm DFN, 5-Lead DD-Pak, TO-220, and 3-Lead SOT-223.
- AEC-Q100 qualified for automotive applications.
Applications
The LT3080IQ#PBF is well-suited for a variety of applications, including:
- Multiple rail power supplies where adjustable voltage is necessary.
- Low voltage digital ICs requiring precise voltage regulation.
- Systems needing thermal management without heat sinks, as the regulator can be paralleled to spread heat.
- Automotive applications due to its AEC-Q100 qualification.
- General-purpose power supply designs requiring high accuracy and low dropout voltage.
Q & A
- What is the maximum output current of the LT3080IQ#PBF?
The maximum output current is 1.1A. - What is the dropout voltage of the LT3080IQ#PBF?
The dropout voltage is 350mV. - How is the output voltage adjusted?
The output voltage can be adjusted using a single resistor connected to the SET pin. - What is the input voltage range of the LT3080IQ#PBF?
The input voltage range is from 1.2V to 36V. - What is the operating temperature range of the LT3080IQ#PBF?
The operating temperature range is from -40°C to 125°C. - Is the LT3080IQ#PBF suitable for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications. - What kind of protection features does the LT3080IQ#PBF have?
It includes current limit with foldback, overtemperature protection, and safe operating area protection. - Can the LT3080IQ#PBF be paralleled to increase output current?
Yes, it can be paralleled to increase output current or spread heat in surface-mounted boards. - What is the minimum ceramic output capacitor required for stability?
The minimum ceramic output capacitor required is 2.2µF. - How does the LT3080IQ#PBF manage heat dissipation?
Heat dissipation can be managed by using a higher voltage supply for the control circuitry and a lower voltage supply for the collector, and by inserting a resistor in series with the collector to spread the heat on the PCB.
