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MC34063AP1

DC-DC converter, buck/boost/inverting, 3-40V, 1.5A switch, 8-PDIP

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Pieza del fabricante：

MC34063AP1

Paquete：

8-PDIP

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Compromiso de calidad
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Descripción

Productos

The MC34063AP1 from onsemi is a DC-DC converter control circuit that supports step-up (boost), step-down (buck), and voltage-inverting topologies. Operating from 3V to 40V with 1.5A internal switch, it is one of the oldest and most versatile switching regulator ICs. Packaged in 8-PDIP.

Especificaciones

Input Voltage 3V to 40V
Corriente de salida 1.5A (internal switch)
Switching Frequency up to 100kHz (set by CT)
Duty Cycle 0-90% (adjustable)
Reference Voltage 1.25V
Topology Buck, Boost, Inverting
Paquete 8-PDIP
Temperatura de funcionamiento 0 to +70 C

Características

  • Supports buck, boost, and inverting topologies
  • 1.5A internal Darlington switch
  • 3-40V wide input range
  • Few external components needed
  • Adjustable switching frequency up to 100kHz
  • Temperature-compensated reference

Aplicaciones

  • Boost converter (3V to 12V)
  • Buck converter (12V to 5V)
  • Negative voltage generator (+5V to -5V)
  • Battery-powered DC-DC conversion

The MC34063AP1 from onsemi is a monolithic DC-DC converter control circuit that has been in production since the 1980s and remains one of the most versatile switching regulator ICs available. It contains all the active functions required for a DC-DC converter: a temperature-compensated 1.25V reference, a comparator, an oscillator, a PWM with active current limiting, and a 1.5A Darlington output switch. With just a handful of external components (inductor, diode, capacitor, resistors), it can implement step-up (boost), step-down (buck), or voltage-inverting topologies. The switching frequency is set by the timing capacitor on pin 3, up to 100kHz. The duty cycle can be adjusted from 0-90% by the comparator. While the 1.5A internal switch limits output current, external transistors can be added for higher power. The MC34063 is ideal for low-cost, general-purpose DC-DC conversion.

The MC34063AP1 oscillator charges the timing capacitor (CT) on pin 3, generating a sawtooth waveform. The oscillator output drives the Darlington switch transistor on and off. The comparator monitors the output voltage through the feedback divider at pin 5 and compares it to the internal 1.25V reference. When the feedback voltage drops below 1.25V, the comparator enables the oscillator, causing the switch to operate. When the output rises above the setpoint, the comparator disables the oscillator. In boost topology, the inductor stores energy during switch-on time and releases it through the diode to the output during switch-off, producing an output voltage higher than the input. In buck topology, the switch connects the input to the LC filter during on-time, and the diode provides a current path during off-time. The current-sensing resistor at pin 7 provides cycle-by-cycle current limiting.

Pin Nombre Función
1 Switch Collector Darlington switch collector (connect to VCC in boost)
2 Switch Emitter Darlington switch emitter (connect to inductor)
3 Timing Capacitor Oscillator timing capacitor (sets frequency)
4 GND Suelo
5 Comparator Inverting Input Feedback input (1.25V reference threshold)
6 VCC Supply voltage (3-40V)
7 Ipk Sense Peak current sense input (current limiting)
8 Driver Collector Darlington driver collector
  • Boost converter stepping 3.7V battery to 12V with 1.5A internal switch
  • Buck converter stepping 12V to 5V at up to 500mA output current
  • Negative voltage generator converting +5V to -5V for op-amp dual supply
  • Low-cost DC-DC conversion with buck, boost, or inverting topologies
Modelo Fabricante Diferencia clave
LM2596 TI Buck only, 3A, higher performance
XL6009 XLSEMI Boost only, 4A, higher power
LM2577 TI Boost only, 3A, simpler
MAX1771 ADI Boost, 2A, higher efficiency
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Tel / WhatsApp: +86 13760382860

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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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