Monolithic Power Systems — MP2166: 6V, Dual 2A/2A or 3A/1A, Low Quiescent Current, Synchronous Buck with PG and SS

The MP2166 is an internally compensated, dual PWM, synchronous step-down regulator that operates from a 2.7V to 6V input and generates an output voltage as low as 0.6V. It can be configured as a 2A/2A or 3A/1A output current regulator and is ideal for powering portable equipment that runs on a single-cell lithium-ion (Li+) battery due to a low 60μA quiescent current. The MP2166 integrates dual 55mΩ high-side switches and 20mΩ synchronous rectifiers for high efficiency without an external Schottky diode. It has peak-current-mode control and internal compensation and is capable of low dropout configurations. Both channels can operate at 100% duty cycle.


  • 2.7V to 6V operating input range
  • 55mΩ/20mΩ RDS(ON)
  • External sync clock up to 3MHz
  • PG indicators and external SS and track
  • Peak efficiency >90%
  • 100% duty cycle operation
  • 2A/2A or 3A/1A continuous current
  • Programmed frequency up to 3MHz
  • 180° phase shifted operation
  • Adjustable advanced asynchronous mode or forced continuous conduction mode
  • 0.6V to VIN adjustable output
  • 60μA quiescent current