PWM Synchronous Buck Control ICs offer single-output design.

Press Release Summary:



Model MIC2155 and MIC2156 single output, synchronous buck control ICs implement 500 kHz and 300 kHz voltage mode PWM control, respectively, with outputs switching 180° out-of-phase that results in 1 MHz or 600 kHz input ripple, with ripple current cancellation. Two independent enable pins and power good output are included. Operating over temperatures from -40 to +125°C, ICs have 4.5-14.5 V input voltage range and adjustable output voltages down to 0.7 V.



Original Press Release:



MIC2155/2155: 2-Phase, Single Output, PWM Synchronous Buck Control IC



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.

Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.

Features

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

o Remote sensing with internal differential amplifier

o 4.5V to 14.5V input voltage range

o Adjustable output voltages down to 0.7V

o 1% output voltage accuracy

o Starts up into a pre-biased output

o 500kHz PWM operation (MIC2155)

o 300kHz PWM operation (MIC2156)

o Adaptive gate drive allows efficiencies over 95%

o Adjustable current limit with no sense resistor

o Senses low-side MOSFET current

o Internal drivers allow 25A per phase

o Power Good output allow simple sequencing

o Dual enables with micro-power shutdown and UVLO

o Programmable soft-start pin

o Output over-voltage protection

o Works with Ceramic output capacitors

o Multi-input supply capability

o Single output high current capability with master-slave current sharing

o External Synchronization

o Small footprint 32-pin 5mm × 5mm MLF®

o Junction temperature range of -40°C to +125°C

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