2A, 6V, 100% Duty Cycle Synchronous, Step-Down Converter with 0.5A LDO



The MP2116 is an internally compensated 1.25MHz, 2A synchronous step-down switching DC-DC converter plus a standalone low-input voltage, 0.5A low dropout (LDO) linear regulator. It is ideal for powering portable equipment that operates from a single cell Lithium-Ion (Li+) Battery. The MP2116 can provide up to 2A to the switcher output, and 0.5A load current to the LDO output from a 2.5V to 6V input voltage. Both output voltages can be regulated as low as 0.6V. The 2A Synchronous switcher features integrated high side and low-side switch for high efficiency and small footprint. With peak current mode control and internal compensation, the MP2116 is stable with ceramic capacitors. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. The standalone low-input voltage 0.5A LDO is used to power noise sensitive circuitry. The LDO?s separate input supply pin (IN2) can be connected to the switcher output to reduce power dissipation and noise from the main switcher. MP2116 is available in the small 10-pin 3x3mm QFN package.



  • 100% Duty Cycle Low Dropout Operation (High-Side PFET)
  • 2A Switcher Output Current at VIN=3V
  • Internal Power MOSFET Switches
  • Stable with Ceramic Capacitors
  • Up to 95% Efficiency for Switcher
  • 1.25MHz Switching Frequency
  • Internal Soft-start for Switcher
  • 2.5V to 6V Input Range, for Switcher
  • 1V to VIN1 Input Range, for LDO
  • 0.5A LDO Output Current
  • 1μA Shutdown Current


  • fsw (max) (kHz)1250
  • 最小输入电压2.5
  • Vin (max) (V)6
  • Iout (max) (A)2
  • Isw Limit (typ) (A)3.1
  • Max Duty Cycle (%)1
  • Vfb (V)0.6
  • Iq (typ) (mA)0.07
  • 额定输出1
  • Vout (max) (V)6
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageQFN-10 (3x3)
  • Common FeaturesPower Good, Synchronous Rectification
  • Special Features100% 占空比