Microchip | MIC3809YMM-TR

The MIC3809YMM TR is a family of complementary output push-pull PWM control ICs that feature high speed and low power consumption. MIC3809YMM TR are ideal for telecom level (36 V to 75 V) 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 MIC3809YMM TR 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 components. The dead-time between the two outputs is adjustable between 60 ns to 200 ns, limiting the duty cycle of each output stage to less than 50%. The MIC3809YMM TR are built on a low-power, high-speed BiCMOS process. The 130μA start-up current and 1mA run-current reduce the size of the start-up circuitry and allow high efficiency even at light loads. The high-speed internal 4 MHz error amplifier allows MIC3808/9 operation up to 1 MHz. The MIC3808 has a turn-on threshold of 12.5 V whereas the MIC3809 has a lower turn-on threshold of 4.3 V. Both devices are available in SOP-8 and MSOP-8 package options with an operating range of –40°C to +85°C.

Key Features:

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