LTC4121EUD-4.2

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The LTC4121EUD-4.2 is a high-efficiency, high-voltage, high-current synchronous rectified multi-cell lithium-ion or lithium-polymer battery charger integrated circuit (IC) designed to enable customers to rapidly charge large battery stacks in consumer and industrial applications. This IC combines targeted features, a thermally enhanced package, a low RDS(ON) internal power MOSFET and a compact form factor. Designed to instantly check cell states and charge up to a selected voltage and current, the LTC4121EUD-4.2 reduces time-to-full-charge while increasing safety.

The fundamental operating principle of the LTC4121EUD-4.2 is to control an internal high side power switch based on an externally applied voltage, overcharge protection current limit, under- and overvoltage cell protection thresholds and a thermally controlled, accurate switching frequency.

The integrated circuit includes an analog-configurable power switch, current monitor and a rich set of protections such as overvoltage, undervoltage, cell balancing, temperature and current monitor for different cells in the stack. The LTC4121EUD-4.2 senses cell voltages and can be used to monitor stack conditions.

The LTC4121EUD-4.2 provides the selection of 1-cell or 2-cell charging mode, 10V–5.5V charging, a current monitor and overvoltage protection. This IC also offers a wide range of features and protections, such as undervoltage protection, current monitor, overvoltage protection, cell balancing, and thermal control, as well as a wide operating temperature range. The LTC4121EUD-4.2 has a high real-time accuracy (< 0.5% accuracy) and can safely charge up to 99 cells.

The LTC4121EUD-4.2 offers an open-drain Fault Output (ODFO) for low or high side over-current and overtemperature conditions, and is capable of driving a 10μA fault signal current from the ODFO pins. The IC also contains a test pin for host-controlled cell balancing.

The LTC4121EUD-4.2 is suitable for a wide variety of applications and markets. In consumer applications, it is useful for most consumer and rechargeable gadgets ranging from mobile phones to electric vehicles, as it enables quicker and safer charging. In industrial applications, the LTC4121EUD-4.2 can be used to charge multiple series and parallel lithium-ion/lithium-polymer cells. Its features ensure that system designers have the necessary safety and protection features to ensure maximum safety of the system and the highest efficiency in charging.

In short, the LTC4121EUD-4.2 is a high-efficiency, high-voltage, multi-cell lithium-ion or lithium-polymer battery charger IC with advanced protection and monitoring features. Its wide range of application areas makes it an ideal choice for charging applications, with its combination of targeted features and low RDS(ON) internal power MOSFET providing efficient charging of large battery stacks in consumer and industrial applications.

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