MC34063ADR2G DC-DC Switching Regulator Controller IC 3V-40V Input 1.5A 100kHz SOIC-8

MC34063ADR2G Product Overview

The MC34063ADR2G is a monolithic DC-DC converter control circuit from onsemi, part of the MC34063A series. It contains an internal temperature-compensated reference, comparator, controlled duty cycle oscillator with active current limit circuit, driver, and high-current output switch, requiring minimal external components to build step-up, step-down, and voltage-inverting DC-DC converters. Housed in a SOIC-8 package, it features a 3.0V to 40V input voltage range, adjustable output voltage from 1.25V to 40V, up to 1.5A output switch current, up to 100kHz operating frequency, and 87.7% typical efficiency, making it a highly cost-effective classic solution for low-to-medium power conversion applications.

MC34063ADR2G Typical Applications

Buck converters: 12V to 5V, 24V to 12V, etc.

Boost converters: 3.7V Li-ion to 5V/12V

Voltage-inverting converters: positive to negative voltage

Portable 12V SLA battery chargers

DC energy harvesting chargers

Automotive electronics power supply (with MC33063A/NCV33063A extended temp versions)

Fan controllers and DC-DC power modules

FAQ

Q: What topologies are supported?
A: Three basic topologies: Step-Down (Buck), Step-Up (Boost), and Voltage-Inverting. Different external component configurations enable positive output, negative output, and outputs above or below the input voltage.

Q: What is the maximum output current?
A: Output switch current reaches 1.5A (peak), with actual average output current around 1A depending on thermal and external component design. Peak current capability is adjustable via external resistor current limit threshold.

Q: What is the difference between MC34063ADR2G and MC33063ADR2G?
A: Both are functionally identical, with the primary difference being temperature range: MC34063ADR2G is 0℃ to +70℃ (commercial), MC33063ADR2G is -40℃ to +85℃ (industrial). NCV33063A is the automotive-grade version (-40℃ to +125℃). Select based on application environment temperature requirements.

Q: How is the switching frequency set?
A: Switching frequency is determined by the timing capacitor connected to the CT pin (pin 3). Smaller capacitor values yield higher switching frequencies. Maximum switching frequency is 100kHz. Refer to onsemi application note AN920A/D for calculation formulas.

Q: Does the chip require external compensation?
A: The MC34063A series integrates an internal temperature-compensated reference and comparator, but overall loop stability depends on external component design. onsemi application notes provide detailed compensation network design methods.

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