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CVCC Cell Lithium-Ion Battery Charger Controller, 16-pin SOIC, National Semiconductor LM3621M - Y19361

National Semiconductor

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National Semiconductor
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Product Overview

Unused, new old stock.

This National Semiconductor LM3621 is a full-function constant voltage, constant current (CVCC) lithium-ion (Li+) battery charger controller. It provides 1% regulation accuracy over the specified temperature range without using external precision resistors.

This 16-pin SOIC IC controls five charge modes: conditioning, fast, top-off, monitor, and maintenance. In addition, the LM3621 detects and flags defective batteries and over-current and over-voltage fault events.

The architecture of the IC is based on high gain constant voltage and constant current control loops. The LM3621 is designed to control a switching charger, a linear charger, or an offline ac adapter charger.

The LM3621 consists of a logic controller, precision bandgap reference, wide bandwidth transconductance error amplifiers, comparators, and an output buffer.


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