MIC943x0 Ripple Blocker™ ICs Microchip MIC943x0 Ripple Blocker™ ICs are designed to provide more efficient noise suppression for today's highly sensitive data and image capturing systems. MIC94300 integrates a low-RDS(ON) current-limit switch and a low-pass filter that passes DC and blocks the AC component of the input voltage. MIC94310 is a high-performance, low dropout regulator that offers better PSRR performance from DC to 5MHz than discrete solutions. Both ICs feature an active-high enable pin for power sequencing.