MIC94325/45/55: 500mA LDO with Ripple Blocker™ Technology

Key Features
  • 1.8V to 3.6V input voltage range
  • Active noise rejection over a wide frequency band: >50dB from 10Hz to 5MHz at 500mA load
  • Rated to 500mA output current
  • Fixed and adjustable output voltages
  • Optional output auto-discharge when disabled
  • Current-limit and thermal-limit protected
  • Ultra-small 0.84mm x 1.32mm 6-ball CSP
  • 1.6mm x 1.6mm, 6-pin Thin DFN
  • Logic-controlled enable pin
  • −40°C to +125°C junction temperature range
Typical Application

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  • Smartphones
  • Tablet PC/notebooks and webcams
  • Digital still and video cameras
  • Global positioning systems
  • Mobile computing
  • Automotive and industrial applications

General Description

The MIC943x5 Ripple Blocker™ is a monolithic integrated circuit that provides low-frequency ripple attenuation (switching noise rejection) to a regulated output voltage. This is important for applications where a DC/DC switching converter is required to lower or raise a battery voltage but where switching noise cannot be tolerated by sensitive downstream circuits such as in RF applications. The MIC943x5 maintains high power supply ripple rejection (PSRR) with input voltages operating near the output voltage level to improve overall system efficiency. A low-voltage logic enable pin facilitates ON/OFF control at typical GPIO voltage levels.

The MIC943x5 operates from an input voltage of 1.8V to 3.6V. The MIC943x5 options include fixed (MIC94345/55) or adjustable (MIC94325) output voltages. The MIC94355 version offers an auto-discharge to discharge the output capacitor when the part is disabled.

Packaged in a 0.84mm x 1.32mm 6-ball CSP or a 6-pin 1.6mm x 1.6mm Thin DFN, the MIC943x5 has a junction operating temperature range of –40°C to +125°C.

Ordering Information
Part Number Package(1) Lead Finish
MIC94325YMT1.6mm x 1.6mm Thin DFNPb-Free
MIC94345-4YCS*0.84mm x 1.32mm CSPPb-Free
MIC94345-FYCS*0.84mm x 1.32mm CSPPb-Free
MIC94345-GYCS*0.84mm x 1.32mm CSPPb-Free
MIC94345-MYCS*0.84mm x 1.32mm CSPPb-Free
MIC94345-SYCS*0.84mm x 1.32mm CSPPb-Free
MIC94345-4YMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94345-FYMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94345-GYMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94345-MYMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94345-SYMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94355-4YCS*0.84mm x 1.32mm CSPPb-Free
MIC94355-FYCS*0.84mm x 1.32mm CSPPb-Free
MIC94355-GYCS*0.84mm x 1.32mm CSPPb-Free
MIC94355-MYCS*0.84mm x 1.32mm CSPPb-Free
MIC94355-SYCS*0.84mm x 1.32mm CSPPb-Free
MIC94355-4YMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94355-FYMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94355-GYMT1.6mm x 1.6mm Thin DFNPb-Free
MIC94355-MYMT*1.6mm x 1.6mm Thin DFNPb-Free
MIC94355-SYMT*1.6mm x 1.6mm Thin DFNPb-Free

1. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. 
* Contact Micrel for availability.

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