Micrel aims to eliminate dropped mobile calls

In an effort to reduce dropped mobile calls, Micrel Inc. developed the MIC94300 voltage follower output and the MIC94310 fixed output, low-dropout (LDO) IC that employ its latest Ripple Blocker active filter technology, which removes noise from the power supply.

Micrel's new Ripple Blocker active filter technology improves minimum detectable signal capturing for low-light image sensors by suppressing system power ripple for the Image System Processor (ISP). By eliminating the large LC filter that would typically be required to reduce ripple in a discrete solution, the MIC943XX series devices provide more usable board space to accommodate space-constrained designs.

Portable applications include smart phones, medical imaging, tablets/ notebooks/webcams, digital still and video cameras, bar code scanners, GPS and image system processors for image sensors. 

The MIC94300 integrates a low-RDSon, current-limit switch and a low-pass filter that passes DC and blocks the AC component of the input voltage. The MIC94310 is a low dropout regulator that Micrel says offers better PSRR performance from DC to 5MHz than discrete solutions. Both chips feature an active-high enable pin for power sequencing. 

Key highlights:

• 1.8V to 3.6V input voltage range
• Active noise rejection over a wide frequency band
  >60dB from 40kHz to 5MHz
• Rated to 200mA output current
• Current-limit and thermal-limit protected
• Ultra-small 0.88mm x 0.88mm 4-ball CSP
• 1.2mm x 1.6mm, 4-pin Thin MLF®
• Logic-controlled enable pin
• −40°C to +125°C junction temperature range
• Very high PSRR (80db @ 1Khz)
• Low dropout of 17 mV, typical (MIC94310)
   

Pricing: Starts at $0.24 for 1K quantity for the MIC94300 and $0.27 for the MIC94310. 

Availability: Volume.

Datasheet: Click here.