Overview
The LT1931AES5#TRMPBF is a high-performance, inverting DC/DC converter produced by Analog Devices Inc. This component is part of the LT1931 series, known for its low noise and high efficiency. It operates in a dual inductor inverting topology, which effectively filters both the input and output currents, resulting in very low output voltage ripple. The LT1931AES5#TRMPBF is particularly useful for applications requiring a negative voltage supply from a positive input voltage.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency | 1.2 MHz / 2.2 MHz | |
| Output Voltage | -5V at 350mA, -12V at 150mA (from 5V input) | V |
| Output Ripple | 1 mV-P-P | mV |
| Switch Voltage | 36V | V |
| VIN to VOUT Differential | Up to 34V | V |
| Package Type | 5-Lead TSOT-23 | |
| Operating Temperature Range | -40°C to 85°C | °C |
| Quiescent Current | Typically 4.5 mA (not switching) | mA |
Key Features
- Low Noise Operation: Achieves very low output voltage ripple of 1 mV-P-P when using ceramic output capacitors.
- High Efficiency: Efficient operation with minimal heat generation.
- Fixed Frequency Switching: Ensures a clean output free from low frequency noise.
- Low Impedance Output: Output voltage remains within 1% of nominal during large load steps.
- Compact Package: Available in the 5-lead ThinSOT package, making it suitable for space-constrained applications.
Applications
- Disk Drive MR Head Bias: Suitable for biasing the MR heads in disk drives.
- Digital Camera CCD Bias: Used for biasing CCDs in digital cameras.
- LCD Bias: Applicable for biasing LCD displays.
- GaAs FET Bias: Ideal for biasing GaAs FETs in various applications.
- Local Low Noise/Low Impedance Negative Supply: Provides a stable, low-noise negative voltage supply for local use.
Q & A
- What is the operating frequency of the LT1931AES5#TRMPBF?
The LT1931AES5#TRMPBF operates at fixed frequencies of 1.2 MHz and 2.2 MHz.
- What are the typical output voltages and currents for the LT1931AES5#TRMPBF?
The component can generate -5V at 350mA or -12V at 150mA from a 5V input.
- What is the output ripple of the LT1931AES5#TRMPBF?
The output ripple is very low, approaching 1 mV-P-P when ceramic output capacitors are used.
- What is the maximum VIN to VOUT differential for the LT1931AES5#TRMPBF?
The maximum VIN to VOUT differential is up to 34V.
- In what package is the LT1931AES5#TRMPBF available?
The component is available in the 5-lead ThinSOT (TSOT-23) package.
- What is the operating temperature range of the LT1931AES5#TRMPBF?
The operating temperature range is -40°C to 85°C.
- What are some common applications of the LT1931AES5#TRMPBF?
Common applications include disk drive MR head bias, digital camera CCD bias, LCD bias, GaAs FET bias, and local low noise/low impedance negative supply.
- How does the LT1931AES5#TRMPBF ensure low noise operation?
The component uses fixed frequency switching and a dual inductor inverting topology to ensure low noise operation.
- What is the quiescent current of the LT1931AES5#TRMPBF when not switching?
The quiescent current is typically 4.5 mA when not switching.
- Is the LT1931AES5#TRMPBF RoHS compliant?
