Fairchild Semiconductor MC33063AD
| Parameters | |
|---|---|
| Series | - |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mfr | Fairchild Semiconductor |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Voltage - Input (Max) | 40V |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Current - Output | 1.5A (Switch) |
| Supplier Device Package | 8-SOIC |
| Output Configuration | Positive or Negative |
| Function | Step-Up, Step-Down |
| Topology | Buck, Boost |
| Frequency - Switching | 100kHz |
| Synchronous Rectifier | No |
| Voltage - Output (Min/Fixed) | 1.25V |
| Voltage - Output (Max) | 40V (Switch) |
| Voltage - Input (Min) | 3V |
| Package | Tube |
| Product Status | Obsolete |
| Base Product Number | MC33063 |
| Standard Package | 75 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
Power IC MC33063AD DC-DC Converter Chip Overview
The MC33063AD is a highly versatile monolithic DC-DC switching regulator controller designed by Fairchild Semiconductor (now part of ON Semiconductor). It integrates all essential functions required for building efficient step-up (boost), step-down (buck), and voltage-inverting converters, making it ideal for applications requiring compact, cost-effective power solutions. Operating across a wide input voltage range of 3V to 40V, the device supports adjustable output voltages from 1.25V to 40V and delivers up to 1.5A of output current. Key features include a temperature-compensated reference, internal oscillator with adjustable frequency (up to 100kHz), active current limiting, and thermal shutdown protection. Its 8-pin SOIC package and minimal external component requirements simplify design and reduce board space. The MC33063AD is widely used in battery-powered devices, automotive electronics, industrial control systems, and portable instrumentation.
Key Features and Technical Specifications
The MC33063AD offers a low standby current (typically 2.5mA) and high efficiency, making it suitable for energy-sensitive applications. Its internal high-current output switch eliminates the need for external power transistors, while the adjustable oscillator frequency allows optimization of component size and switching losses. The device supports both positive and negative output configurations, with a line regulation of ±0.02%/V and load regulation of ±0.5%. Key parameters include a maximum duty cycle of 88%, short-circuit protection, and an operating temperature range of -40°C to +85°C. The chip’s flexible topology enables designs for step-up, step-down, and voltage-inverting applications, with external components determining the specific configuration. Its robust design and reliability make it a popular choice for demanding industrial and automotive environments.
MC33063AD's Applications
The MC33063AD is widely adopted in applications requiring efficient power conversion, such as battery chargers, LED drivers, portable medical devices, and automotive power supplies. Its ability to handle wide input voltage ranges and deliver adjustable output voltages makes it suitable for multi-voltage systems. The device’s integrated current limiting and thermal shutdown protect against overloads and overheating, enhancing system reliability. Additionally, its compact SOIC-8 package and minimal external components reduce design complexity and cost. Engineers appreciate its flexibility in supporting various DC-DC converter topologies, enabling rapid prototyping and time-to-market. The MC33063AD’s combination of performance, reliability, and ease of use makes it a go-to solution for power management in diverse industries.
Alternative Step-Up Step-Down Controller Models
● MC34063AD: Offers identical functionality with a slightly different temperature range (0°C to +70°C), suitable for less extreme environments.
● LM2576: A step-down switching regulator with higher output current (3A) and fixed output voltage options, ideal for high-power applications.
● LT1073: A micropower DC-DC converter with lower input voltage requirements (1.5V min), suitable for battery-operated devices.
● MAX668: A high-efficiency step-up controller with adjustable frequency (up to 500kHz), optimized for compact designs.
