LM3622M-4.2/NOPB

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The LM3622M-4.2/NOPB is a general purpose 4.2V linear battery charging controller from Texas Instruments. This chip is part of the company\'s wider portfolio of power management integrated circuits (PMICs). It is specifically designed for battery charging applications such as those found in portable electronic devices. This article will provide an overview of the LM3622M-4.2/NOPB\'s application field and working principles.

The LM3622M-4.2/NOPB is suitable for use in both single and multicell Ni-MH/NiCd charging applications. It employs an input current shunt approach plus a low on-resistance linear pass-through MOSFET switch to provide constant current charging and thermal protection. The linear pass-through switch also helps prevent overcharging. The chip provides both USB-compliant and automatically controlled charging methods, allowing the user to customize their design for a specific application\'s needs.

The LM3622M-4.2/NOPB offers a number of features that make it suitable for a variety of battery charging applications. First of all, it provides adjustable charging current from 0.025A to 2A. It also features thermal overload protection and overvoltage protection, plus it has a selectable timer that provides automatic termination of charging at a preset time depending on the battery capacity. Additionally, the chip also has a low-current quiescent current of only 700µA, making it very efficient.

In terms of its application field, the LM3622M-4.2/NOPB can be used in portable systems such as mobile phones, notebook computers, PDA’s, digital cameras and camcorders. It can also be used in medical and industrial applications, as well as automotive lighting systems and GPS navigation systems. Its wide operating temperature range of -40°C to 85°C makes it suitable for use in extreme environments.

The LM3622M-4.2/NOPB works by converting incoming AC or DC power into a regulated output voltage to charge the battery. It is configured to the appropriate charge rate and current limit threshold by an on-chip, digitally adjustable DC setting circuit. The capacitor and resistor connected to the chip’s set pin will be adjusted depending on the charging current and cutoff timer setting. The chip monitors the current, voltage, and temperature sensors within the system, and turns on and off the charge current appropriately to ensure safe, efficient charging. Once the battery reaches full charge, the chip will automatically terminate the charge.

In summary, the LM3622M-4.2/NOPB is a power management integrated circuit (PMIC) that is designed to manage the charging of single and multicell Ni-MH/NiCd batteries. It features adjustable current and cutoff time settings, thermal overload protection and low quiescent current consumption. The chip can be used in a variety of portable systems, as well as medical, industrial, automotive and GPS navigation applications. It works by converting incoming AC or DC power into a regulated output voltage, and then monitors the charging process to ensure safe, efficient charging.

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