The MIC2155 and MIC2156 are a family of 2-phase, single output synchronous buck control ICs featuring small size, high efficiency, and a high level of flexibility. The ICs implement a 500kHz (MIC2155) and 300kHz (MIC2156) voltage mode PWM control, with the outputs switching 180° out of phase. The result of the out-of-phase operation is 1MHz (or 600kHz) input ripple with ripple current cancellation, minimizing the required input filter capacitance. A 1% output voltage tolerance allows the maximum level of system performance. Internal drivers with adaptive gate drive allow the highest efficiency with the minimum external components.

Two independent enable pins and a power good output are provided, allowing a high level of control and sequencing capability.

The MIC215x family has a junction operating range from -40°C to +125°C.

  Synchronous Buck Control ICs with outputs switching 180° out-of-phase

  Remote sensing with internal differential amplifier

  4.5V to 14.5V input voltage range

  Adjustable output voltages down to 0.7V

  1% output voltage accuracy

  Starts up into a pre-biased output

  500kHz PWM operation (MIC2155)

  300kHz PWM operation (MIC2156)

  Adaptive gate drive allows efficiencies over 95%

  Adjustable current limit with no sense resistor

  Senses low-side MOSFET current