LM2665M6/NOPB

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Introduction

The LM2665M6/NOPB is a monolithic switching regulator from Texas Instruments that has been designed to provide a high-level performance, cost efficient power supply solution for a variety of applications. The LM2665M6/NOPB is a synchronous rectified DC/DC switching regulator, with a maximum output current of 1.5A and an adjustable output voltage from 0.8 V to 5.2V.

Application Field

The LM2665M6/NOPB can be used in a wide range of applications such as battery powered systems (including mobile phones, digital cameras, music players, etc.), portable medical & automotive electronics, wireless communications and industrial / instrumentation applications. As the LM2665M6/NOPB is a low-cost, efficient switching regulator, it is also well-suited as a general-purpose DC/DC regulator where space and cost efficiency are primary considerations.

Working Principle

The LM2665M6/NOPB works by first converting the input voltage (typically 5V) to an intermediate voltage (typically 3.2V). This is done by an internal charge pump which consists of two transistors, effectively creating a voltage divider between the input voltage and the intermediate voltage. The regulator then starts a switching cycle to charge a capacitor from the intermediate voltage to the output voltage. This charging process takes place in two stages, first using a voltage ramp generated by the regulator\'s oscillator and comparator circuits to charge the output voltage to a coarse value, and then using the built-in current source to fine-tune the output voltage to the precise final value.

The switching cycle is controlled by the LM2665M6/NOPB\'s control logic. When the output voltage reaches the required level, the control logic stops the switching cycle and goes into a low-power standby state until the output voltage drops below a certain threshold (typically 0.4 V), at which point the regulator is restarted.

The LM2665M6/NOPB also features a power Sequencing mode to enable accurate sequencing of multiple outputs. It is possible to configure the timing and voltage level for each output as desired. This feature allows the designer to ensure that the power-up sequence is safe and reliable.

Conclusion

The LM2665M6/NOPB is a versatile, cost-efficient switching regulator that is suitable for a wide range of applications. Its on-chip control logic and power sequencing mode enable precise control of the output voltage, making it well-suited for applications that require tight control of the output voltage. By choosing the LM2665M6/NOPB, designers can have confidence that their design will have superior performance, high efficiency, and reliability.

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