Product Details The LTC4007EGN-TR is a high-efficiency standalone lithium-ion battery charger controller designed for charging 3- or 4-cell Li-Ion battery packs. It combines constant-current and constant-voltage charging control with battery monitoring and charge termination functions, providing a practical solution for rechargeable battery power systems.The device operates from a 6V to 28V input range and supports charging currents exceeding 4A. Charging current can be programmed through an external resistor, while the charger provides current monitoring through a dedicated output. The charging voltage can be configured for different cell counts and Li-Ion charging chemistries, making the controller suitable for a range of multi-cell battery designs.The LTC4007EGN-TR uses a synchronous switching architecture to achieve high conversion efficiency, with efficiency reaching up to 96% under suitable operating conditions. Its maximum duty cycle can reach 98%, while the low dropout characteristic helps maintain charging operation as the input voltage approaches the battery voltage.Battery management functions are integrated into the controller to simplify charger design. The device provides built-in charge termination, automatic recharge behavior, low-battery detection, AC adapter current limiting and fault indication. A thermistor input can also be used to suspend charging when the battery temperature falls outside the qualified charging range.The controller is designed for 24-pin narrow SSOP packaging, making it suitable for compact power management boards where an external switching charger architecture is preferred. Its programmable charging current and configurable battery cell settings allow designers to adapt the charging circuit to different battery capacities and system requirements.Typical applications include notebook computers, portable instruments, battery backup systems and standalone Li-Ion chargers. It can also be used in portable electronic equipment and other rechargeable power systems requiring controlled multi-cell lithium-ion charging.When designing with the LTC4007EGN-TR, the external power components, battery configuration, charging current, thermal management and protection requirements should be selected according to the intended application and the device datasheet.