MP5403B 2A Mini PMIC QFN-20

MP5403B 2A Mini PMIC QFN-20

The MP5403B is a monolithic power management unit containing two high- efficiency, step-down, switching converters and a load switch.

Key Specifications

Features

• Up to 6V Operating Input Range
• Low IQ: 85µA for Two Switchers Total
• One Load Switch with 20mΩ RDS(ON) o 3A with 20mΩ RDS(ON) o Soft Start (SS) and Output Discharge o 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

Typical Application Circuit

Applications

• Solid-State Drives (SSD)
• Portable Instruments

Design Notes

• Rail sequencing order and delay are part of the SoC power-up contract; a wrong order latches the processor even though every rail is in spec.
• In multiphase designs, current balance depends on the loop matching between phases, so keep the layout symmetric.
• Digital interfaces (PMBus, I²C) need pull-ups to the correct rail and a defined state during power-up.
• Thermal design is a system problem here: the PMIC sits next to the load it feeds, so budget the shared copper, not the package alone.

Common Questions