General Description
The MIC3808 and MIC3809 are a family of complementary output push-pull PWM control ICs that feature high speed and low power consumption. The MIC3808/9 are ideal for telecom 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 single ended 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 components. 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%.

FEATUREs
• Dual output drive stages in push-pull configuration
• Leading edge current-sense blanking
• 130µA typical start-up current
• 1mA typical run current
• Operation to 1MHz
• Internal soft start
• On-chip error amplifier with 4MHz gain bandwidth product
• On-chip VDD clamping
• Output drive stages capable of 500mA peak source current, 1A peak sink current

Applications
• High efficiency “brick” power supply modules
• Half bridge converters
• Full bridge converters
• Push-pull converters
• Voltage-fed push-pull converters
• Telecom equipment and power supplies
• Networking power supplies
• Industrial power supplies
• 42V automotive power supplies
• Base stations