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Introduction

The LM3218SEE/NOPB is a monolithic switched-mode power supply (SMPS) controller IC that uses a low-input voltage and provides multiple selectable output voltage steps. This device integrates a number of features, including line and load regulation, high efficiency, reverse current protection, input overvoltage protection, thermal shutdown and frequency adjustment. This article will provide an overview of the application field and working principle of the LM3218SEE/NOPB.

Application Field

The LM3218SEE/NOPB SMPS IC is designed for a variety of inverting and isolated DC/DC conversion applications. It is most commonly used in 12-V to 28-V automotive applications, such as vehicle displays, instrumentation, and air conditioning systems. It is also suitable for a wide range of commercial and industrial applications, including telecom and server systems, pulsed laser diode systems, and high-accuracy analog circuitry.

Physical Characteristics

The LM3218SEE/NOPB is available in a compact 20-pin, 4-mm × 4-mm power quad flat no-lead (PQFN) package, which makes it easy to integrate into applications that require a small form factor. It is rated for a supply voltage from 10 V to 28 V and a power dissipation of up to 3.2 W.

Operating Principles

The LM3218SEE/NOPB works by controlling a third-party N-channel MOSFET switch that switches either a buck (step down) or boost (step up) buck-boost converter topology. The input current is sensed and the output voltage is controlled by a voltage mode control loop. The power output can be varied over a wide range by adjusting the switching frequency of the MOSFET, which varies the duty cycle of the converter. If the output voltage varies, the controller will modulate the frequency to maintain regulation accuracy.

Conclusion

The LM3218SEE/NOPB is a versatile precision switching regulator SMPs IC that is suitable for a wide range of applications, from automotive to commercial and industrial. It is available in a small package and has a range of features to ensure efficient operation.

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