MIC3809
Description
The MIC3808 and MIC3809 are a family of plementary output push-pull PWM control ICs that feature high speed and low power consumption. The MIC3808/9 are ideal for tele level (36V to 75V) isolated step down dc/dc conversion applications where high output current, small size, and high efficiency are required. The dual-ended push-pull architecture of the MIC3808/9 allows more efficient utilization of the transformer than singleended topologies, allowing smaller size dc/dc solutions. Additionally, the out-of-phase push-pull topology allows a higher effective duty cycle, reducing input and output ripple as well as stress on the external ponents. The dead-time between the two outputs is adjustable between 60ns to 200ns, limiting the duty cycle of each output stage to less than 50%. The MIC3808/9 are built on a low-power, high-speed Bi CMOS process. The 130µA start-up current and 1m A run-current reduce the size of the start-up circuitry and allow high efficiency even at light...
