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onsemi MC33063ADX
- Part No.:
- MC33063ADX
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063ADX.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,125
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Product details
Overview
MC33063ADX from Fairchild Semiconductor is a monolithic DC-DC switching regulator controller IC designed for step-up, step-down, and inverting topologies. It integrates a temperature-compensated bandgap reference (1.24 V), oscillator with 100 Hz–100 kHz frequency range, 1.5 A output switch, and current-limit sensing at 300 mV. It operates from 3.0 V to 40 V input and supports industrial temperature range (−40°C to +85°C) in 8-pin SOIC package.
For engineers reviewing the MC33063ADX datasheet, pinout, applications, or equivalent options, key selection considerations include its adjustable output voltage capability, internal 1.5 A switch, low standby current, short-circuit protection, and compatibility with standard external components for cost-sensitive power conversion designs.
Technical Context
The MC33063ADX implements a fixed-frequency, current-mode control architecture using an internal oscillator with programmable timing capacitor (CT) and resistor (RT). Its comparator compares sensed switch current against a 300 mV threshold to enable cycle-by-cycle current limiting.
It features dual-stage output switching: Q1 (driver transistor) controls Q2 (main switch), enabling high-current switching with low saturation voltage (0.70 V typ. at 1.0 A). The 1.24 V reference feeds the inverting input of the error amplifier, supporting precise output regulation via external resistor divider feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Output Switch Current | 1.5 A - enables direct drive of external inductor without external pass transistor in most 1–3 W converters. |
| Current Sense Threshold | 300 mV typ. - sets overcurrent limit with minimal power loss across sense resistor. |
| Oscillator Frequency Range | 100 Hz to 100 kHz - allows optimization of size (inductor/capacitor) vs. efficiency and EMI. |
| Reference Voltage | 1.24 V ±3% - provides stable feedback point for accurate output voltage setting via resistive divider. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade ambient operation without derating. |
| Supply Current | 5 mA max - ensures low quiescent power draw in standby or light-load conditions. |
Pinout & Package
MC33063ADX is housed in an 8-lead SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012, 0.150-inch narrow body, with 1.27 mm lead pitch. Pin 1 marked by beveled edge or dot indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Collector | High-current output node connected to external inductor; switches between VIN and GND in buck/boost/inverter configurations. |
| 2 (GND) | Ground Reference | Power and signal ground return for oscillator, comparator, and driver circuits. |
| 3 (VCC) | Supply Input | Primary power input (3–40 V); powers internal circuitry and charges timing capacitor. |
| 4 (CT) | Oscillator Timing | Connects external timing capacitor to set oscillator frequency; discharge/charge currents define period. |
| 5 (ISENSE) | Current Limit Sense | Monitors voltage drop across external sense resistor; triggers shutdown when ≥300 mV. |
| 6 (OUT) | Driver Output | Drives base/gate of external PNP transistor (Q1) or directly drives NPN switch in some configurations. |
| 7 (COMP) | Error Amplifier Output | Open-collector output of internal comparator; used for loop compensation and feedback stability tuning. |
| 8 (VREF) | Reference Output | Provides 1.24 V bandgap reference; connects to feedback divider for regulated output voltage setting. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A switch | Eliminates need for external power transistor in sub-3 W DC-DC designs, reducing BOM count and layout area. |
| Adjustable output voltage | Enabled by 1.24 V precision reference and external resistor divider - supports outputs from ~1.25 V to >40 V depending on topology. |
| Short-circuit current limiting | Hardware-based protection triggered at 300 mV sense voltage - prevents thermal runaway during fault conditions without software intervention. |
| Wide input voltage range | 3.0 V to 40 V operation accommodates 12 V/24 V industrial rails, automotive batteries, and multi-cell battery packs. |
| Temperature-compensated reference | 1.24 V ±3% over −40°C to +85°C ensures stable regulation across full operating range without external trimming. |
Applications
| Industrial Power Supply | Automotive Lighting Control |
|---|---|
Use Scenario: Generating isolated 5 V or 12 V rail from unregulated 24 V factory bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary controller in non-isolated buck converter; regulates output via duty-cycle modulation synchronized to internal oscillator. Use Value: Enables compact, low-cost local regulation without transformer or LDO inefficiency; 1.5 A switch handles peak loads up to 15 W with proper heatsinking. | Use Scenario: Driving LED arrays in vehicle interior lighting with constant-current regulation via external sense resistor. IC Role / Device Role / Timing Role: Controller in boost configuration; adjusts duty cycle to maintain constant current through LED string despite battery voltage variation (9–16 V). Use Value: Delivers stable LED brightness across cold-crank and alternator-swing conditions using only passive external components. |
| Portable Medical Instrument | Legacy Industrial Sensor Interface |
Use Scenario: Providing ±5 V rails from single 9 V alkaline battery in handheld diagnostic device. IC Role / Device Role / Timing Role: Dual-regulator implementation: one MC33063ADX in inverting mode for −5 V, another in step-down for +5 V. Use Value: Achieves bipolar supply generation with <100 µA quiescent current in shutdown - extends battery life beyond 100 hours. | Use Scenario: Replacing obsolete linear regulators in 4–20 mA transmitter loop-powered sensors with limited PCB space. IC Role / Device Role / Timing Role: Step-down controller supplying 3.3 V to microcontroller and analog front-end from 24 V loop supply. Use Value: Reduces heat dissipation by >70% versus 78L05 LDO, enabling sealed enclosure operation without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SMPS controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-5.0 | Fixed 5 V output; no adjustable reference; higher quiescent current (8 mA); integrated switch rated 0.5 A. | Suitable only for fixed-output 5 V buck applications; cannot support boost/invert or custom voltages. | Select when simplicity and fixed output outweigh flexibility and current capability. |
| TPS54202DR | 2 A integrated FET; 4.5–28 V input; 500 kHz switching; requires external compensation; no inverting mode. | Better suited for high-efficiency, high-density buck designs but lacks inverting capability and wide input range. | Prefer for new designs requiring >1.5 A or >100 kHz operation where layout space permits external compensation network. |
Compared with LM2574N-5.0 and TPS54202DR, the MC33063ADX offers unique topology flexibility (buck/boost/invert), widest input range (3–40 V), and highest integrated switch current (1.5 A) among legacy-compatible controllers - making it optimal for retrofitting and cost-constrained industrial power stages.
Availability
MC33063ADX is available at Aetrix Electronics and suitable for industrial power supplies, automotive lighting control, portable medical instrumentation, and legacy sensor interface designs requiring stable component supply and long-term lifecycle support.
Supply support for MC33063ADX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016.
The MC33063ADX belongs to Fairchild's legacy SMPS controller product line, engineered for robust, low-cost DC-DC conversion in industrial, automotive, and instrumentation applications where reliability and design simplicity are prioritized over ultra-high frequency or digital control.
FAQ
What is the maximum output current supported by the MC33063ADX without external transistors?
The MC33063ADX integrates a 1.5 A output switch, verified under pulsed test conditions per datasheet. In continuous conduction mode, practical output current depends on thermal design, ambient temperature, and external component selection. At 25°C ambient with adequate copper area, MC33063ADX reliably delivers up to 1.0 A in buck configuration while maintaining safe junction temperature. Exceeding this requires external switching transistors.
Does the MC33063ADX support inverting (negative output) DC-DC conversion?
Yes, the MC33063ADX explicitly supports inverting topology per its official datasheet description and block diagram. When configured as an inverting regulator, it generates a negative output voltage referenced to system ground, using the same external components (inductor, diode, capacitor, timing resistor/capacitor) as buck or boost modes. This makes MC33063ADX suitable for generating dual-rail supplies from a single input.
What is the function of Pin 7 (COMP) on the MC33063ADX?
Pin 7 (COMP) is the open-collector output of the internal error amplifier/comparator. It sinks current when the feedback voltage falls below the 1.24 V reference, enabling external RC compensation networks to stabilize the control loop. Proper compensation on MC33063ADX COMP pin is essential to prevent oscillation and ensure transient response stability - especially critical in variable-load applications like motor drivers or LED dimming.
Can the MC33063ADX operate from a 3.3 V input supply?
Yes, the MC33063ADX has a minimum specified input voltage of 3.0 V, so it functions correctly at 3.3 V. However, due to internal voltage drops (e.g., VCE(SAT) ≈ 0.7 V), achieving regulated output above ~2.5 V in buck mode requires careful attention to duty cycle limits and timing component selection. For 3.3 V input, MC33063ADX is best applied in boost or inverting configurations to generate higher or negative outputs.
Is the MC33063ADX RoHS compliant and what is its packaging format?
Yes, the MC33063ADX is RoHS compliant per Fairchild's ordering information table and eco-status documentation. It is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with 1.27 mm lead pitch, conforming to JEDEC MS-012, variation AA. The package is marked "MC33063AD" and carries date code and lot traceability per industry standards.
MC33063ADX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC33063ADX FAQ
1.How can I place an order for MC33063ADX through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063ADX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC33063ADX reliable?
The price and inventory of MC33063ADX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063ADX is usually 5 days.
3.What payment methods are accepted for MC33063ADX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063ADX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063ADX?
MC33063ADX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063ADX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC33063ADX?
For technical support, including MC33063ADX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063ADX requirements.
6.How does Aetrix verify that MC33063ADX is sourced from the original manufacturer or authorized distributors?
All MC33063ADX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC33063ADX meets industry standards.
7.What is the process for return or replacement of MC33063ADX?
All MC33063ADX units undergo pre-shipment inspection (PSI). If there is an issue with MC33063ADX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC33063ADX part is unused and in its original packaging.
Return procedure for MC33063ADX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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