LM3420AM5X-8.4

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PMICs (Power Management Integrated Circuits) are very important devices used in a wide range of applications and the Battery Chargers are the most popular. Among these, LM3420AM5X-8.4 is one of the most widely used. It is a low quiescent current, constant frequency step-down synchronous DC-DC converter. It can deliver up to 20A output current and is configurable with adjustable switching frequency from 500kHz to 2MHz.

The LM3420AM5X-8.4 is used for various kinds of battery charging applications and provides a variable output voltage. It can operate over a wide range of input voltages from 4.5V to 42V and can be set to charge various types of batteries from single cell Li-Ion to four internally connected Li-Ion cells. This makes it one of the most versatile and cost-effective battery chargers in the market.

The LM3420AM5X-8.4 provides many features which make it suitable for battery charger applications. It provides adjustable current limiting and programmable slope compensation to optimize the charging process. It also has auto restart capabilities, thermal shutdown and current limiting to protect the battery from overcharge and overvoltage conditions. Additionally, the LM3420AM5X-8.4 is compatible with eFUSE, which allows the power supply to be configured and monitored using REF.

The operating principle of the LM3420AM5X-8.4 is very simple. It uses a voltage feedback loop to set the output voltage of the battery charger and then applies a PWM (Pulse Width Modulation) signal with a constant frequency to the power MOSFET. This allows the output voltage to be regulated. In order to optimize the power efficiency, the LM3420AM5X-8.4 includes a synchronous rectification function. This function ensures that the power MOSFET will switch on and off together with the PWM signal and thus reduce the losses in the power supply by reducing the on-state power MOSFET resistance.

The LM3420AM5X-8.4 is ideal for battery charging applications due to its adjustable output voltage range, current limiting and programmable slope compensation. It is used in many consumer and industrial applications such as electric vehicles, power tools, portable devices and industrial robots. It is an efficient, cost effective and reliable power management solution.

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