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MC33063ADR

DC-DC converter IC, 3-40V, 1.5A switch, 100kHz, buck/boost/invert, SOIC-8

15600

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Manufacturer Part：

MC33063ADR

Package：

SOIC-8 (4.90 x 3.91 x 1.58 mm)

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Description

Product Overview

The MC33063ADR from onsemi is a 1.5A DC-DC converter control circuit in SOIC-8 that implements step-up, step-down, and voltage-inverting topologies with a minimum number of external components. Operating from 3V to 40V with 100kHz switching frequency, it is a versatile and cost-effective solution for simple power supply designs.

Key Specifications

Input Voltage Range 3.0 V to 40 V
Output Switch Current 1.5 A (max)
Switching Frequency 100 kHz (typ, adjustable)
Output Voltage Adjustable
Reference Accuracy 2% (typical)
Standby Current 4 mA (typ)
Operating Temperature 0C to +70C (A grade)

Features

  • Step-up, step-down, and voltage-inverting capability
  • 1.5A internal power switch reduces external component count
  • 100kHz typical switching frequency with adjustable timing
  • Operates from 3V to 40V input
  • 2% reference voltage accuracy
  • Current limiting via external sense resistor

Applications

  • Simple step-up and step-down DC-DC converters
  • Negative voltage generation for op-amp supplies
  • Battery-powered equipment power supplies
  • Auxiliary power rails in automotive systems

The MC33063ADR from onsemi is a monolithic DC-DC converter control circuit containing the primary functions required for step-up (boost), step-down (buck), and voltage-inverting converters. The device integrates a 1.5A internal Darlington power switch, oscillator, comparator, reference, and logic in an SOIC-8 package. It operates from 3V to 40V input with a typical switching frequency of 100kHz, adjustable via an external timing capacitor. The internal 1.25V reference has 2% typical accuracy. Output voltage is set by an external resistor divider. Current limiting is implemented via an external sense resistor in series with the switch. Only 5-6 external components are needed for a complete converter.

The MC33063ADR uses a simple fixed-frequency, variable-duty-cycle control scheme. (1) Oscillator: An internal oscillator generates the switching frequency (100kHz typical), set by the timing capacitor on pin 3. The oscillator produces a fixed on-time and varies the off-time based on the feedback. (2) Comparator: The feedback voltage (from pin 5) is compared to the internal 1.25V reference. When VFB is below the reference, the comparator enables the output switch. (3) Power Switch: The internal 1.5A Darlington NPN switch connects pin 1 (collector) to pin 2 (emitter). In step-up mode, an inductor is placed between VIN and the collector, and the output is taken from the emitter through a diode. In step-down mode, the inductor is placed between the emitter and the output. (4) Current Limiting: The peak switch current is monitored via an external sense resistor. When the voltage across the sense resistor exceeds approximately 300mV, the switch is forced off for the remainder of the cycle.

Pin Name Type Function
1 Switch Collector Output Darlington switch collector
2 Switch Emitter Output Darlington switch emitter
3 Timing Capacitor I/O Oscillator timing capacitor
4 GND Ground Ground reference
5 Comparator Invert Input Input Feedback voltage input (1.25V ref)
6 VCC Power Supply voltage (3-40V)
7 I_pk Sense Input Peak current sense input
8 Driver Collector Output Darlington driver collector
  • Simple step-up and step-down DC-DC converters with minimal external components
  • Negative voltage generation for op-amp and LCD bias supplies
  • Battery-powered equipment power supplies with 3-40V input range
  • Auxiliary power rails in automotive systems with 1.5A switch capability
Manufacturer Part Number Package Notes
onsemi NCV33063ADR SOIC-8 Automotive qualified
TI MC34063ADR SOIC-8 Pin-compatible equivalent
STMicroelectronics MC33063AD SOIC-8 Pin-compatible equivalent
Richtek RT34063AS SOIC-8 Higher frequency version
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