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LM2665M6 Application Field and Working Principle

The LM2665M6 is a DC-DC switching regulator designed for battery-operated applications. It is an integrated, high-efficiency boost regulator with adjustable output voltage and current, enabling longer battery life over comparable designs.

Description

The LM2665M6 is a low-power, highly integratedDC-DC switching regulator that operates in Buck, Boost, SEPIC, Flyback or Invertingtopologies. The high efficiency switching regulator features adjustable input and outputvoltage, adjustable current limit, and high current output. It effectively delivers up to 2MHz switching frequency with fixed frequency voltage mode control scheme, eliminating the use of high gain amplifiers. It is equipped with a built-in low-dropout (LDO) regulator for regulating a noisy input voltage supply.

Features and Benefits

• High- Efficiency Operation: The LM2665M6 provides up to 95% efficiency and is designed to be operable from a single cell Li-ion battery.
• High Output Current: Output current up to 4.2A, up to 4A with operating conditions up to 0.4V dropout.
• Low Quiescent Current: Quiescent current of just 90uA helps extend battery life in light load applications.
• Wide Input Voltage Range: Operates down to 1.8V or up to 6V without loop stability issues.
• Defeatable Dynamic Voltage Scaling: Enable power saving at light loading condition.
• Tiny SOT-23-8 Packages: The tiny 8-Lead SOT-23 allows minimal design footprint.

Applications

The LM2665M6 is ideally suited for battery operated portable applications such as mobile phones, PDAs and other battery powered devices. Other applications include DC/DC transducers, DC/DC power supplies and output boost converters.

Working Principle

The LM2665M6 operates in Buck, Boost, SEPIC, Flyback or Inverting topologies. It incorporates a fixed frequency PWM control for output regulation. The internal oscillator runs at a fixed frequency, which is adjustable from 50kHz to 2MHz, depending on the application requirements. The output voltage of the LM2665M6 is regulated by the error amplifier and feedback inputs connections. The voltage VFB is compared to the internal reference voltage VREF. If VFB is lower than VREF, the error amplifier regulates the PWM comparator to drive the N-MOS switch OFF. The N-MOS switch is turned OFF and the inductor current flows through the low side diode and the output capacitor, increasing the output voltage. If VFB is higher than VREF, the error amplifier regulates the PWM comparator to drive the N-MOS switch ON. The inductor current is discharged through the N-MOS switch, decreasing the output voltage. The LM2665M6 also features adjustable current limit. When the current limit is greater than the inductor current limit, the inductor current will increase until it reaches the current limit threshold, then the PWM comparator is disabled, ceasing the switch drive. The current through the inductor is thereby limited and regulated to the preset current limit parameter.

Conclusion

In conclusion, the LM2665M6 is an integrated, high-efficiency DC-DC switching regulator designed for battery operated applications. With high efficiency operation and adjustable current limit, it is designed to provide longer battery life in portable applications. Its high-speed switching architecture helps minimize the control loop latency and reduces power dissipation. It offers wide input voltage range and variable output voltage, making it ideal for a variety of applications.

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