PWM Synchronous Buck Control ICs offer single-output design.July 29, 2010 -
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.
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Original Press release
Micrel Semiconductor Inc.
1849 Fortune Dr.
San Jose, CA, 95131
USA
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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