Ultra-Low 500nA Iq, Wide Input 2V-5.5V, 300mA Step-Down Regulator Plus300nA Iq, V-5.5V Input, 100mA LDO 1.2x1.6mm CSP

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Product Description

The MP28310 is a monolithic power-management unit containing 300mA, high-efficiency, step-down, switching converters and a 100mA LDO regulator. The nanoamp quiescent current provides extremely high efficiency when the load current is down in the µA range. With minimum input voltage as low as 2V, the MP28310 allows the system to operate directly from the battery.

The constant-on-time control scheme provides fast transient response, high light-load efficiency, and requires minimal capacitance. The regulation can be made tight by integrating an error amplifier to correct the output voltage.

An 100mA LDO regulator provides easy system configuration with clean output voltage.

The CTRL pins control the on/off and output voltage selection functions.

Fault protection features include under-voltage lockout (UVLO), over-current protection (OCP), and thermal shutdown.

The MP28310 requires a minimal number of readily available, standard, external components and is available in a small CSP-12 (1.2mmx1.6mm) package.

Product Features

  • 300mA Buck Switcher
    • Ultra-Low Iq: 500nA
    • Wide 2.0V to 5.5V Operating Input Range
    • 7 Selectable Output Voltages
    • Up to 300mA Output Current
    • 1.5MHz Switching Frequency in Continuous Conduction Mode (CCM)
    • 100% Duty Cycle in Dropout
    • 0.25Ω and 0.25Ω Internal Power MOSFET Switches
    • Cycle-by-Cycle Over-Current Protection (OCP)
    • Short-Circuit Protection (SCP) with Hiccup Mode
  • 100mA LDO
    • Ultra-Low Iq: 300nA
    • 2.0V to 5.5V Operating Input Range
    • 3 Selectable Output Voltages
    • Over-Temperature Protection (OTP)
  • Available in a CSP-12 (1.2mmx1.6mm) Package


  • fsw (max) (kHz)1500
  • Vin (min) (V)2
  • Vin (max) (V)5.5
  • Iout (max) (A)0.3
  • Isw Limit (typ) (A)0.6
  • Max Duty Cycle (%)1
  • Iq (typ) (mA)0.0005
  • Regulated Outputs2
  • Vout (max) (V)3.3
  • Vout (min) (V)1.2
  • GradeCatalog
  • PackageCSP-12 (1.2x1.6)
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special Features100% Duty Cycle, 3 Selectable LDO Output Voltages, 7 Selectable Output Voltages, Ultra-Low Iq

Reference Materials

Quality Policy, Certificates & Reliability Reports
All MPS parts are lead-free, halogen-free and adhere to the RoHS directive. See Environmental section for details.