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MC34063ADR2G

DC-DC converter, step-up/down/inverting, 1.5A, SOIC-8

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Pieza del fabricante：

MC34063ADR2G

Paquete：

SOIC-8

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Descripción

Productos

The MC34063ADR2G from onsemi is a 1.5A DC-DC converter control circuit supporting step-up, step-down, and voltage-inverting topologies in SOIC-8 for versatile power conversion.

Especificaciones

Paquete SOIC-8

Características

  • See datasheet for complete specifications
  • Industry-standard package

Aplicaciones

  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Automotive electronics

The MC34063ADR2G from onsemi is a 1.5A DC-DC converter control circuit supporting step-up, step-down, and voltage-inverting topologies in SOIC-8 for versatile power conversion.

The MC34063ADR2G is a DC-DC converter control IC from onsemi in SOIC-8, capable of step-up (boost), step-down (buck), and voltage-inverting topologies with external components. It is one of the oldest and most widely used switching regulator ICs (introduced 1980s, still in production). The internal architecture: (1) A 1.25V bandgap reference; (2) A comparator that compares the scaled output voltage (via resistor divider on CII pin) with the reference; (3) An oscillator that generates the switching frequency from the external timing capacitor (CT pin); (4) A 1.5A Darlington NPN output switch (SWC/SWE pins); (5) A peak current sense comparator (Ipk pin, 330mV threshold). The control loop: the oscillator sets the switch ON time; during ON time, current ramps up in the external inductor; if the peak current exceeds the Ipk threshold, the switch turns off early; the OFF time is set by the oscillator; the comparator regulates the output by skipping cycles or adjusting the duty cycle. In buck mode: the switch connects the inductor to VIN during ON time; during OFF time, the inductor current flows through the external Schottky diode to the output. Typical external components: inductor (100-470uH), Schottky diode (1A), timing capacitor (470pF-1nF for 25-100kHz), current sense resistor (0.2-1 ohm), and input/output capacitors. Efficiency is typically 70-85%. The -ADR2G suffix specifies SOIC-8, lead-free. The MC34063 is used in automotive, industrial, and consumer electronics for simple, low-cost voltage conversion.

Pin Nombre Tipo Función
1 SWC Salida Switch collector (internal Darlington NPN collector, up to 40V)
2 SWE Salida Switch emitter (internal Darlington NPN emitter, connects to inductor/diode)
3 CT Analógico Timing capacitor (sets switching frequency: f = 1/(0.000055 x CT), 24kHz at 1nF)
4 GND Potencia Suelo
5 CII Entrada Comparator inverting input (1.25V reference, connect resistor divider from output)
6 VCC Potencia Supply (3.0-40V, connect with 470uF electrolytic and 0.1uF ceramic)
7 Ipk Entrada Peak current sense (connect sense resistor from VCC, Vpk=330mV threshold)
8 DRC Salida Driver collector (internal PNP driver collector, boost current gain)
  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Automotive electronics
    • Fabricante Número de pieza Paquete Notas
    onsemi MC34063ADR2G SOIC-8 Same device, onsemi brand
    Texas Instruments MC34063ADR SOIC-8 Same device, TI brand
    onsemi NCV33063ADR2G SOIC-8 Automotive version, AEC-Q100 qualified
    STMicroelectronics L4970A DIP-20 5A buck regulator, more integrated, ST brand
    Texas Instruments LM2596SX-5.0 TO-263 5V 3A SIMPLE SWITCHER, TI brand, easier to use
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