is a monolithic DC-DC converter IC commonly used for step-up (boost), step-down (buck), and inverting voltage converter circuits. It is widely used in power supply designs for low-to-medium current applications.
Input voltage range: ~3 V to 40 V (operating supply range) — usable for many battery or automotive applications.
Adjustable output voltage: Typically 1.25 V to ~40 V (set via external resistors).
Output switch (peak) current: up to 1.5 A (internal switch limit).
Switching frequency: up to ~100 kHz (set by external timing capacitor).
Internal reference voltage: ~1.25 V ±2% — used for the feedback network
Low standby current — suitable for battery-powered devices.
Current limiting — protects against overloads.
Thermal shutdown / protection in some versions.
Low quiescent (idle) current — ~a few mA typical.
MC34063 is commonly used for:
Step-down (buck) regulators
Step-up (boost) converters
Inverting power supplies
Flexible voltage regulation in battery-powered, embedded, or simple industrial circuits