LTC4070IMS8E#PBF

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The LTC4070IMS8E#PBF is a highly-efficient, industrial-grade, Single Cell Li-Ion/Li-Polymer (Li+) Battery Charger with PowerPath Control. It combines the Low IQ current-mode controller with a low-resistance switching MOSFET and an integrated protection circuit that enables output current up to 2A. This charger is best suited in PMIC - Battery Chargers applications, where excellent performance is required while maintaining a low profile, minimal power loss and low parts count.

The LTC4070IMS8E#PBF is designed specifically to find applications in PMIC boards and smartphones, tablets, music players and portable medical instruments. It provides automatic PowerPath charging and buck-mode charge current sequencing for low-voltage Li+ batteries, with a low battery current of 200μA, thus maintaining extended battery life. This charger also offers low quiescent current and features integrated side switches, which allow the device to optimize power management states.

The PowerPath control circuit responds to either the battery or the USB source mode being connected, directing the current source or sink to the load. When the load is a battery, the LTC4070IMS8E#PBF provides a buck-mode charge current up to 2A, and when the load is the USB port, the device saturates the field-effect transistor P-channel to allow charging current up to 100mA.

The Protection Circuit of the LTC4070IMS8E#PBF enables it to offer thermal protection and reduce the operating temperature, thus ensuring reliable operation. This charge controller helps reduce the time to full-charge the battery, offering automatic precharge current thresholds, when a battery is below 2.9V. The charge controller also includes basic safety features like minimum and maximum voltage regulation, bad cell detection, and soft start.

The LTC4070IMS8E#PBF features an internal and fixed 50mV voltage regulation loop that allows charging current and precharge current thresholds, which are adjustable with an external resistor. It also offers IC internal short-circuit protection, which prevents damage to the load and the IC itself by instantly pulling the MOSFET gate voltage to ground voltage. The integrated soft-start feature of this switch charger prevents full-inrush currents and overshoot, making it suitable for high-power applications.

The LTC4070IMS8E#PBF is available in the 8-lead LLP package and requires a minimum operating voltage of 2.7V, a maximum operating voltage of 5.5V, and an operating temperature range from -40°C to +85°C. It has a quiescent current of 10μA, enabling fast and efficient charging in applications where saving board space is a primary design consideration.

The LTC4070IMS8E#PBF is an ideal solution for PMIC - Battery Chargers applications, requiring exceptional performance and features in low-power environments, thus providing robust battery charging solutions with excellent cost/performance benefits. It delivers superior efficiency, long battery life and convenient charging, thereby simplifying power management and providing more efficient system operation.

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