LM3621M/NOPB

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Power Management ICs, or PMICs, are integrated circuits typically used in consumer electronics and consumer applications. The LM3621M/NOPB is a PMIC Battery Charger IC from Texas Instruments specifically designed for single cell Li-Ion and Li-Pol batteries in portable applications such as cellular phones, desktops, and laptop computers. It utilizes a maximum power point tracking algorithm to ensure that the output current is optimized for maximum efficiency over a range of input voltages and battery temperatures.

The LM3621M/NOPB contains one current path, so it can be used in single-cell charging applications. It is capable of delivering up to 1A of output current and includes precise voltage regulation for both charging and discharging and protects against undervoltage, overvoltage, and overcurrent faults. The charger also supports trickle pre-charge, sleep modes, and a rechargeable battery reset. Additionally, the LM3621M/NOPB supports temperature monitoring and thermal protection through an integrated temperature sensor.

The LM3621M/NOPB is suitable for a wide range of applications, including handheld and medical devices, smartphones, tablets, and notebook PCs. Its wide input voltage range (3V to 5.25V), low quiescent current of 15uA, and fast charge time of less than 1 hour (1C) make it ideal for applications requiring quick charge times and low power. Additionally, the LM3621M/NOPB features an advanced dynamic power management algorithm which adjusts output current as needed to ensure maximum efficiency over a wide range of input voltages and battery temperatures.

The LM3621M/NOPB implements an algorithm to accurately track the maximum power point of the Li-Ion/Li-Pol battery stack, enabling the optimal maximum refill of the battery. During operation, the power management algorithm samples the battery cell voltage and the input source present across the system input. The algorithm then adjusts the charging current accordingly to ensure the maximum efficiency over a range of input voltages and battery temperatures. The LM3621M/NOPB is highly accurate and maintains a tight tolerance of +/-2%.

The LM3621M/NOPB implements robust safety features such as undervoltage lock out and overvoltage protection. It also incorporates temperature monitoring and overcurrent protection. The LM3621M/NOPB can operate with minimum microcontroller control, and most of the fault condition handling algorithms are implemented internally. In addition, the LM3621M/NOPB features a wake-up reset function, which enables automatic system reset in the event of an overcurrent fault. The reset logic is monitored continuously, ensuring safety during operation.

The LM3621M/NOPB is suitable for a wide range of applications and is available in a space-saving 7-pin SOT-23 package. The LM3621M/NOPB features low quiescent current, a wide input voltage range, fast charge time and accurate maximum power point tracking algorithms. Additionally, it includes high-reliability safety features and easy to understand charge status pins. The LM3621M/NOPB is an ideal choice for charging single cell Li-Ion/Li-Pol batteries in small, portable electronic products.

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