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Buck / boost / inverting controller

MC34063A Internal Circuitry

Explore the internal circuitry and functional stages of MC34063A.

Package view

Inside MC34063A

Timing, feedback and switch drive within the eight-pin package.

MC34063A functional cutaway with CT oscillator, current sense, 1.25V reference, comparator, latch, driver and NPN switch.
Functional organization inside an original package drawing; not physical silicon placement.

Explore the circuit

Select a stage to see its role and connections

Compare the output

INV5 is compared with the 1.25 V reference.

Coordinate timing and current

CT3 and IPK7 feed the pulse-control system.

Drive the power transistor

DC8 supplies the driver; SC1 and SE2 expose the main switch terminals.

Component view