SY6990 Datasheet | Silergy

Application Notes: AN_SY6990 Wide Input, High current, Bi-directional Regulator for Single Cell Li-Ion Battery Power Bank Application Advanced Design Specification General Description SY6990 is a 4.0-13.5V input, bi-directional regulator for Li-Ion battery power bank application. Advanced bi-directional energy flow control with automatic input power source detection is adopted to achieve battery charging mode and battery power supply mode alternately. If the external power supply is present, SY6990 runs in battery charging mode with fully protection function. If the external power supply is absent, SY6990 runs in battery power supply mode with output current capability up to 3A. SY6990 has an integrated reverse blocking switch to prevent from current leaking from the system side or battery side to the input side and an integrated linear switch to achieve over voltage/current protection at the system side. A half bridge with quasi-fixed 0.5MHz switching frequency is integrated to achieve power conversion for battery charging mode and battery power supply mode. All of them adopt N-channel MOSFETs with 16V rating and extremely low RDS(ON) to optimize operation efficiency and extend battery life-time. SY6990 is available in QFN4x4 package to minimize the PCB layout size for wide portable applications. Ordering Information SY6990 ( ) - - - - Temperature Code Package Code Optional Spec Code Ordering Number Package type SY6990QCC QFN4x4-24 Note Features Integrated N-Channel MOSFETs with 16V Voltage Rating and Extremely Low RDS(ON) High Switching Frequency to Minimize Peripheral Circuit Design Trickle Current / Constant Current / Constant Voltage Charging Mode Maximum 5A Battery Charging Current Maximum 3A System current in Battery power supplement mode USB Port Identifier for Various Input Current Limit Automatic Input Power Source Detection I2C Controls Selectable Battery Charge Voltage Programmable Constant Current Charging Programmable Over Current Limit for...