MIC2155/6 Buck Control IC

Microchip's 2-phase, single output, PWM synchronous buck control IC

Image of Micrel's MIC2155/6 Buck Control ICMicrochip's 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.

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 low-side MOSFET current
  • Internal drivers allow 25A per phase
  • Power Good output allow simple sequencing
  • Dual enables with micro-power shutdown and UVLO
  • Programmable soft-start pin
  • Output over-voltage protection
  • Works with ceramic output capacitors
  • Multi-input supply capability
  • Single output high current capability with master-slave current sharing
  • External synchronization
  • Small footprint 32-pin 5mm × 5mm MLF®
  • Junction temperature range of -40°C to +125°C

MIC2155-6 Buck Control IC

ImageManufacturer Part NumberDescriptionPart StatusOutput TypeAvailable Quantity
MIC2155YML-TR datasheet linkIC REG CTRLR BUCK 32MLFMIC2155YML-TRIC REG CTRLR BUCK 32MLFActiveTransistor Driver0MIC2155YML-TR product page link
MIC2156YML-TR datasheet linkIC REG CTRLR BUCK 32MLFMIC2156YML-TRIC REG CTRLR BUCK 32MLFObsoleteTransistor Driver0MIC2156YML-TR product page link
Published: 2010-11-29