Overview
The LT8390JFE#PBF is a synchronous 4-switch buck-boost DC/DC controller produced by Analog Devices Inc. This controller is designed to regulate output voltage, input or output current from an input voltage that can be above, below, or equal to the output voltage. It utilizes a proprietary peak-buck peak-boost current mode control scheme, allowing smooth transition between buck, buck-boost, and boost regions. The LT8390 is suitable for a wide range of applications, including those requiring high efficiency and reliability over a broad temperature range.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Voltage Range | 4 | 60 | V | |
| Operating Junction Temperature Range | –40 | 150 | °C | |
| Switching Frequency | 600 | kHz | ||
| FB Voltage Regulation | 0.2 | 0.5 | 0.8 | % |
| FB Load Regulation | 0.2 | 0.5 | 0.8 | % |
| Current Comparator Maximum Current Sense Threshold | 35 | 40 | 50 | mV |
| FB Overvoltage Threshold | 1.08 | 1.1 | 1.12 | V |
| Package Type | 28-Lead (4mm × 5mm) Plastic QFN |
Key Features
- Synchronous 4-switch buck-boost topology for high efficiency and smooth transition between buck, buck-boost, and boost regions.
- Regulates output voltage, input or output current from an input voltage above, below, or equal to the output voltage.
- Proprietary peak-buck peak-boost current mode control scheme.
- Wide input voltage range: 4V to 60V.
- High accuracy voltage regulation with 0.2% to 0.8% FB voltage regulation and 0.2% to 0.8% FB load regulation.
- Multiple fault protection modes including hiccup, latch-off, and keep-running during output short-circuit conditions.
- Operating temperature range from –40°C to 150°C, with automotive-grade options available.
Applications
- Automotive systems, including those requiring high reliability and temperature stability.
- Industrial power supplies where high efficiency and wide input voltage range are necessary.
- Railway and aerospace applications due to its robust design and wide operating temperature range.
- Renewable energy systems, such as solar and wind power, where input voltage can vary widely.
Q & A
- What is the input voltage range of the LT8390JFE#PBF? The input voltage range is from 4V to 60V.
- What is the switching frequency of the LT8390JFE#PBF? The switching frequency is typically 600 kHz.
- What are the operating temperature ranges for the LT8390JFE#PBF? The operating temperature ranges are from –40°C to 150°C, with specific grades for automotive applications.
- What types of fault protection does the LT8390JFE#PBF offer? The LT8390JFE#PBF offers hiccup, latch-off, and keep-running fault protection modes during output short-circuit conditions.
- Can the LT8390JFE#PBF be used in automotive applications? Yes, versions of this part are available with controlled manufacturing to support automotive applications and are designated with a #W suffix.
- What is the package type of the LT8390JFE#PBF? The package type is a 28-Lead (4mm × 5mm) Plastic QFN.
- How does the LT8390JFE#PBF regulate output voltage and current? It uses a proprietary peak-buck peak-boost current mode control scheme to regulate output voltage and current from an input voltage above, below, or equal to the output voltage.
- What is the accuracy of the voltage regulation in the LT8390JFE#PBF? The voltage regulation accuracy is 0.2% to 0.8% for FB voltage regulation and 0.2% to 0.8% for FB load regulation.
- Can the LT8390JFE#PBF be used in industrial power supplies? Yes, it is suitable for industrial power supplies due to its high efficiency and wide input voltage range.
- How does the LT8390JFE#PBF handle overvoltage and short-circuit conditions? It has built-in overvoltage and short-circuit protection mechanisms, including fault modes such as hiccup, latch-off, and keep-running.
