Mini PMIC with Dual 4A/5A Peak Bucks, One 2A Load Switch, and Input Power Supervisory

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Product Description

The MP5403B is a monolithic power management unit containing two high-efficiency, step-down, switching converters and a load switch. The two regulators supply peak currents up to 5A and 4A separately, and the load switch supplies up to 3A of load current with an extremely low RDS(ON). With an input range of up to 6V, the MP5403B is ideal for powering ASIC and SOC for solid-state drives (SSD) and other compact power systems.
The peak-current-mode control scheme with pulse-skip mode operation provides the two switchers with fast transient response, high light-load efficiency, and a minimal number of capacitors by using an interleaving PWM clock between the two switchers. The 3A load switch with a low 20mΩ on resistance provides flexible system configuration.
A full set of enable control pins and power good open-drain indicators allow for easy implementation of the start-up and shutdown sequences.
Full protection features include over-current protection (OCP) and thermal shutdown.
The MP5403B requires a minimal number of readily available, standard, external components and is available in a small UTQFN-20 (2.5mmx3mm) package.

Product Features

  • Up to 6V Operating Input Range
  • Low IQ: 85µA for Two Switchers Total 
  • Two Buck Converters
    • Peak 5A with 55mΩ/20mΩ RDS(ON)
    • Peak 4A with 65mΩ/22mΩ RDS(ON) 
    • 1.5MHz Switching Frequency
    • 180° Interleaving Operation
    • 100% Duty Cycle
    • Load Switch Mode by Pulling FB Low 
    • Latch-Off Short-Circuit Protection (SCP)
    • Internal Soft Start (SS) and Output Discharge 
    • Optimized Light-Load Efficiency 
  • One Load Switch with 20mΩ RDS(ON) 
    • 3A with 20mΩ RDS(ON)
    • Soft Start (SS) and Output Discharge
    • Over-Current Protection (OCP)
  • EN and Power Good (PG) for Power Sequencing 
  • Input Power Good (PG) Indicator with Adjustable Threshold and Delay 
  • Thermal Shutdown
  • Available in a UTQFN-20 (2.5mmx3mm) Package


  • Vfb (V)0.6
  • Vin (min) (V)2.7
  • Vin (max) (V)6
  • Iout (max) (A)5
  • Iq (typ) (mA)0.085
  • Regulated Outputs3
  • fsw (max) (kHz)1500
  • Step-Down DC/DC Controller0
  • Step-Down DC/DC Converter2
  • Step-Up DC/DC Controller0
  • Step-Up DC/DC Converter0
  • Internal LDO0
  • GradeCatalog
  • PackageUTQFN-20 (2.5x3.0)
  • Internal LDO
  • Step-Down Converter Current (A)4.0, 5.0
  • Special Features180° Phase-Shifted Operation, Adjustable PFL Threshold and Delay, Buck Output Discharge, Fixed Output Voltage Options, Input Power Failure Indicator (PFL), Parallel Capability for Buck, USB Output Discharge
  • SS内部
  • PGYes

Reference Materials