MIC2155

MIC2155/2156 www.DataSheet4U.com Two-Phase, Single-Output, PWM Synchronous Buck Control IC General Description The MIC2155 and MIC2156 are a family of two-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. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. Features 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 ...