Overview
The LT8609EMSE#PBF is a high-efficiency, high-speed synchronous monolithic step-down switching regulator produced by Analog Devices Inc. This compact regulator is designed to operate over a wide input voltage range and is suitable for various applications requiring high current output with low quiescent current.
It is part of the LT8609 family, which includes the LT8609, LT8609A, and LT8609B, each with slightly different characteristics such as switch edge speed and operation modes. The LT8609EMSE#PBF is particularly noted for its high efficiency, fast transient response, and low EMI emissions.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Units |
|---|---|---|---|---|
| Input Voltage Range | 3.0 | - | 42 | V |
| Output Current | - | - | 3 | A |
| Quiescent Current (Non-Switching) | 1 | 1.7 | 4 | µA |
| Switching Frequency | 200kHz | - | 2.2MHz | - |
| Output Ripple (P-P) | - | - | 10mV | - |
| Minimum On-Time | 45ns | - | - | - |
| Operating Junction Temperature Range | -40°C | - | 125°C | - |
| Package Type | - | - | 10-Lead Plastic MSOP | - |
Key Features
- Wide Input Voltage Range: Operates from 3.0V to 42V, making it versatile for various power supply configurations.
- Ultralow Quiescent Current: Consumes only 1.7µA of non-switching quiescent current, enhancing efficiency in low-load conditions.
- High Efficiency: Achieves efficiency greater than 93% at 1A, 5V output from a 12V input.
- Fast Transient Response: Internal compensation with peak current mode topology allows for fast transient response and good loop stability.
- Low EMI Emissions: Features spread spectrum frequency modulation and slower switch edges in the LT8609A version for reduced EMI.
- Adjustable and Synchronizable: The switching frequency can be adjusted from 200kHz to 2.2MHz, and the regulator can be synchronized to an external clock.
- Output Soft-Start and Tracking: A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up.
- Compact Package: Available in a small 10-Lead MSOP package, making it suitable for space-constrained designs.
Applications
- General Purpose Step-Down Conversion: Suitable for a wide range of applications requiring high-efficiency step-down conversion.
- GSM Transceivers: Ideal for applications in wireless communication systems due to its low EMI emissions and high efficiency.
- Automotive Systems: AEC-Q100 qualified, making it suitable for use in automotive applications where reliability and performance are critical.
- Low EMI Step-Down Conversion: The LT8609A version with slower switch edges is particularly useful in applications where low EMI is a requirement.
Q & A
- What is the input voltage range of the LT8609EMSE#PBF?
The input voltage range is from 3.0V to 42V.
- What is the maximum continuous output current of the LT8609EMSE#PBF?
The maximum continuous output current is 3A.
- What is the quiescent current of the LT8609EMSE#PBF in non-switching mode?
The quiescent current in non-switching mode is 1.7µA.
- Can the LT8609EMSE#PBF be synchronized to an external clock?
Yes, the LT8609EMSE#PBF has a SYNC pin that allows synchronization to an external clock.
- What is the typical efficiency of the LT8609EMSE#PBF at 1A, 5V output from a 12V input?
The typical efficiency is greater than 93%.
- What package types are available for the LT8609EMSE#PBF?
It is available in a 10-Lead Plastic MSOP package.
- Is the LT8609EMSE#PBF suitable for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications.
- How does the LT8609EMSE#PBF manage EMI emissions?
It features spread spectrum frequency modulation and slower switch edges in the LT8609A version to reduce EMI emissions.
- Can the output voltage of the LT8609EMSE#PBF be adjusted?
Yes, the output voltage can be adjusted using the FB pin and external resistors.
- What is the minimum on-time of the LT8609EMSE#PBF?
The minimum on-time is 45ns.
