MIC2155/6 Buck Control IC


Micrel's 2-Phase, Single Output, PWM Synchronous Buck Control IC

Click to Enlarge - MIC2155 Diagram Micrel, Inc.'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.
MIC2155/2156 Datasheet

  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
RoHS Compliant

Micrel
Part Number
Digi-Key
Part Number
Packaging Frequency - Switching Voltage -
Output
Current -
Output
Package
MIC2155YML TR 576-3527-2-ND Tape & Reel 510kHz Adj down to 0.7V 50A 32-MLF®
576-3527-1-ND Cut Tape
576-3527-6-ND Digi-Reel®
MIC2156YML TR 576-3528-2-ND Tape & Reel 310kHz Adj down to 0.7V 50A 32-MLF®
576-3528-1-ND Cut Tape
576-3528-6-ND Digi-Reel®