Overview
The LT1117CST-3.3#PBF is a positive low dropout regulator produced by Analog Devices Inc. This device is designed to provide up to 800mA of output current and is available in both adjustable and fixed output voltage versions. The LT1117CST-3.3#PBF specifically offers a fixed output voltage of 3.3V. It is known for its high efficiency, low dropout voltage, and robust performance characteristics, making it suitable for a variety of applications where space and power efficiency are critical.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Output Current | 800 | mA | |||
| Output Voltage (LT1117-3.3) | IOUT = 10mA, 0°C ≤ TJ ≤ 125°C | 3.3 | 3.3 | 3.3 | V |
| Dropout Voltage (VIN – VOUT) | IOUT = 800mA | 1.2 | V | ||
| Line Regulation | 0.2% | ||||
| Load Regulation | 0.4% | ||||
| Operating Junction Temperature Range | 0°C | 125°C | |||
| Storage Temperature Range | –65°C | 150°C | |||
| Minimum Output Capacitance | 10 | μF |
Key Features
- Low dropout voltage: Guaranteed maximum of 1.2V at 800mA, decreasing at lower load currents.
- High efficiency: Quiescent current flows into the load, increasing efficiency.
- Adjustable and fixed output voltages: Available in 2.85V, 3.3V, and 5V fixed versions, as well as an adjustable version.
- Space-saving package: Available in a 3-lead plastic SOT-223 package.
- Robust performance: Operates down to 1V input to output differential and has a current limit to minimize stress on the regulator and power source.
- Precision voltage regulation: On-chip trimming adjusts the reference/output voltage to within ±1%.
Applications
- Active SCSI terminators
- High efficiency linear regulators
- Post regulators for switching supplies
- Battery chargers
- 5V to 3.3V linear regulators
Q & A
- What is the maximum output current of the LT1117CST-3.3#PBF?
The maximum output current is 800mA.
- What are the available fixed output voltages for the LT1117 series?
The fixed output voltages available are 2.85V, 3.3V, and 5V.
- What is the minimum output capacitance required for stability?
A minimum of 10μF of output capacitance is required for stability.
- What is the operating junction temperature range for the LT1117CST-3.3#PBF?
The operating junction temperature range is 0°C to 125°C.
- What is the typical dropout voltage at 800mA load current?
The typical dropout voltage at 800mA load current is 1.2V.
- What package type is the LT1117CST-3.3#PBF available in?
The device is available in a 3-lead plastic SOT-223 package.
- What are some common applications of the LT1117 series?
Common applications include active SCSI terminators, high efficiency linear regulators, post regulators for switching supplies, battery chargers, and 5V to 3.3V linear regulators.
- How does the quiescent current of the LT1117 affect efficiency?
The quiescent current flows into the load, increasing the overall efficiency of the regulator.
- What is the line regulation of the LT1117CST-3.3#PBF?
The line regulation is a maximum of 0.2%.
- What is the load regulation of the LT1117CST-3.3#PBF?
The load regulation is a maximum of 0.4%.
