DCtoDC升壓IC應用NCP1450A PWM Stepup DCDC Controller The NCP1450A series are PWM step-up DC-DC switching controller that are specially designed for powering portable equipment from one or two cells battery packs. The NCP1450A series have a driver pin, EXT pin, for connecting to an external transistor. Large output currents can be obtained by connecting a low ON-resistance external power transistor to the EXT pin. The device will automatically skip switching cycles under light load condition to maintain high efficiency at light loads. With only six external components, this series allows a simple means to implement highly efficient converter for large output current applications. Each device consists of an on-chip PWM (Pulse Width Modulation) oscillator, PWM controller, phase- compensated error amplifier, s……