2.5V-6V Input, 3MHz, 1A Synchronous Step-Down Converter



The MP2128 is a 3MHz constant frequency, current mode, PWM step-down converter with integrated main switch and synchronous rectifier that is ideal for powering portable equipment that runs from a single Li-Ion or Li-Polymer battery. The MP2128 can supply up to 1A load current from a 2.5V to 6V input voltage. The output voltage can be as low as 0.6V. Additional features include <1? shutdown current, internal soft-start, cycle-by-cycle over current protection, short circuit protection, and thermal shutdown. The MP2128 is available in low profile (1.5mm) 5-pin SOT23 and 8-pin, QFN8 2mm?mm packages.



  • High Efficiency: Up to 95%
  • 3MHz Constant Switching Frequency
  • 1A Available Load Current2.5V to 6V Input Voltage Range
  • Output Voltage as Low as 0.6V
  • Current Mode Control
  • Cycle-by-Cycle Over Current Protection
  • Short Circuit Protection
  • Thermal Shutdown
  • <1? Shutdown Current
  • Internal Soft-Start
  • Space Saving 5-Pin SOT23 Package and 8-pin, QFN8 2x2mm Package


  • fsw (max) (kHz)3000
  • 最小输入电压2.5
  • Vin (max) (V)6
  • Iout (max) (A)1
  • Isw Limit (typ) (A)1.5
  • Max Duty Cycle (%)1
  • Vfb (V)0.594
  • Iq (typ) (mA)0.35
  • 额定输出1
  • Vout (max) (V)6
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageQFN-8 (2x2), SOT23-5
  • Control ModeCurrent Mode
  • Common FeaturesSynchronous Rectification
  • Special Features100% 占空比