LM2647MTC

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LM2647MTC is an adjustable high-precision low voltage DC/DC converter, which belongs to the DC/DC switching controller in PMIC voltage regulator. It provides up to a maximum of 1A output current and enhanced accuracy over military temperature range. With profound expertise, detailed knowledge and extensive experience of power management designs, the operating principles and application field of the LM2647MTC can be discussed.

FEATURES

The LM2647MTC is designed for applications requiring low extraneous noise, high conversion efficiency, compact circuit implementations and low power dissipation. Specifically, its features are:

• Pulse frequency modulation with frequency foldback
• 2.8V to 5V wide input voltage range
• Adjustable output voltage up to 5V
• Very high efficiency (up to 96%)
• Very low noise and ripple (2µVrms at 1A)
• Fast transient response & soft-start function

WORKING PRINCIPLE

The LM2647MTC is a closed-loop DC/DC switching controller that uses Pulse Frequency Modulation (PFM) technology to control the output voltage, which achieves high efficiency and low external noise. The output voltage can be set with a simple external resistive divider or an optional external DAC. The resistor values determine the peak current of the switching MOSFET and the peak current of the output inductor, allowing the setting of the exact required current.

The LM2647MTC includes several key features, such as a PFM control loop, programmable short-circuit protection, and frequency foldback control. During constant voltage mode, the PFM control loop monitors the output by comparing it to the feedback voltage. In order to maintain the output voltage and ensure that the system is stable, the output voltage is adjusted depending on the error between the two voltage levels. While the Fast Transient Response feature allows the output voltage to meet system load requirements with minimal delay, the programmable short-circuit protection feature eliminates the need for external protection components.

The frequency foldback feature is also integrated in the LM2647MTC. The frequency foldback feature reduces the switching power dissipation, resulting in better efficiency and output ripple. When the inductor current approaches the peak current limit, the frequency will be reduced and a foldback operation will occur. This reduces the power dissipation, allowing the system to run at higher efficiency.

APPLICATION FIELD

The LM2647MTC is a suitable choice for applications that require low excursions on the output voltage, such as memory power, microprocessor core and I/O voltages. Additionally, it is suitable for distributed power supplies, low voltage switching regulators, automotive applications and data power servers. This device is also well-suited for configurable power supplies, medical instrumentation and charging. Typical applications for the LM2647MTC are shown in Figure 1.

Figure 1. Typical applications of the LM2647MTC.

In conclusion, the LM2647MTC is an adjustable high-precision low voltage DC/DC converter suitable for many applications in the field of power supply and management designs. Its features provide a number of advantages, such as current-mode PFM control, fast transient response and frequency foldback. These features enable the LM2647MTC to provide up to 1A output current as well as improved accuracy over the military temperature range. Thus, the LM2647MTC is an ideal choice for many applications that require a robust, efficient, and accurate DC/DC converter.

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