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onsemi MC33063AD
- Part No.:
- MC33063AD
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063AD.pdf
- Description:
- IC REG 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,183
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Product details
Overview
MC33063AD from onsemi is a monolithic DC-DC switching regulator controller IC designed for step-down (buck), step-up (boost), and voltage-inverting applications. It integrates a temperature-compensated 1.25 V reference, comparator, oscillator with active current limit, driver, and 1.5 A Darlington output switch. Operates from 3.0 V to 40 V input, supports up to 100 kHz switching frequency, and delivers precise 2% reference accuracy - used in industrial power supplies and battery-powered converters.
For engineers reviewing the MC33063AD datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (3–40 V), output switch current capability (1.5 A), oscillator frequency adjustability via timing capacitor, current-limit sense threshold (300 mV typ), and SOIC-8 package thermal performance (RJA = 160 °C/W).
Technical Context
The MC33063AD implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by an external capacitor (CT) between Pin 3 and GND. Its Darlington output stage enables high-current switching with low saturation voltage (1.0 V max at 1.0 A), while the 1.25 V precision reference feeds the comparator's inverting input for stable feedback regulation.
Current limiting is achieved via sensing voltage across an external resistor (RSC) connected between Pin 7 (Ipk Sense) and Pin 8 (Switch Emitter); the device triggers shutdown when sensed voltage reaches ~300 mV. The oscillator's charge/discharge current ratio (6.5 typ) and CT-based timing define duty cycle and frequency, supporting design flexibility across buck, boost, and inverting topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Switch Current | 1.5 A - enables direct drive of external inductors in 1–2 W DC-DC converters without external boost transistors. |
| Oscillator Frequency | Up to 100 kHz - sets practical upper limit for magnetic component size and EMI filtering requirements. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback node for accurate output voltage setting via resistor divider. |
| Current Limit Threshold | 300 mV typical - defines peak switch current via RSC = 0.3 Ω / IPK, enabling precise overcurrent protection. |
| Supply Current (Standby) | 4.0 mA max - determines quiescent power loss in low-load or sleep-mode operation. |
| Operating Temperature | −40°C to +85°C - qualifies for extended-temperature industrial environments (not automotive-grade NCV variant). |
Pinout & Package
MC33063AD is housed in an 8-pin SOIC-8 (D suffix, Case 751) package with standard 1.27 mm pitch, 5.0 mm × 4.0 mm body, and 1.75 mm max height. Thermal resistance is 160 °C/W (junction-to-ambient) at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Switch Collector | High-side collector of internal Darlington transistor; connects to inductor/rectifier node in boost/inverting topologies. |
| 2 | Switch Emitter | Emitting terminal of internal Darlington; tied to ground or current-sense resistor (RSC) for current limiting. |
| 3 | Timing Capacitor | Connects external CT capacitor to set oscillator frequency and duty cycle timing. |
| 4 | GND | Power and signal ground reference for all internal circuits and feedback network. |
| 5 | Driver Collector | Collector of internal driver transistor; used to drive external NPN/PNP transistors for higher current capability. |
| 6 | Ipk Sense | Current limit sense input; monitors voltage drop across RSC between Pins 2 and 6 to trigger foldback. |
| 7 | VCC | Main supply input (3–40 V); powers internal circuitry and charges oscillator timing capacitor. |
| 8 | Comparator Inverting Input | Feedback node for output voltage regulation; connected to resistor divider from regulated output. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Darlington Output Switch | Eliminates need for external high-current transistors in ≤1.5 A designs, reducing BOM count and layout complexity. |
| Adjustable Oscillator Frequency | Set via single external CT capacitor (e.g., 1 nF → ~33 kHz), enabling optimization of efficiency vs. size trade-offs. |
| Precision 1.25 V Reference | ±2% tolerance ensures stable output voltage regulation across temperature and line variations without trimming. |
| Active Current Limiting | Real-time peak-current detection via RSC prevents destructive overloads and enables robust short-circuit protection. |
| Wide Input Voltage Range | 3.0–40 V operation supports direct connection to 12 V/24 V industrial rails and multi-cell battery stacks. |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Generating isolated or non-isolated 5 V/12 V rails from unregulated 24 V factory bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary controller in step-down (buck) configuration, regulating output via feedback to Pin 8 and switching at ~50 kHz. Use Value: Enables compact, low-cost power conversion with only 6 external components (inductor, diode, capacitor, two resistors, timing cap). | Use Scenario: Boosting 3.7 V Li-ion battery voltage to 5 V for USB peripheral interfaces in portable test equipment. IC Role / Device Role / Timing Role: Step-up (boost) controller with Pin 1 as switch collector and Pin 2 grounded; oscillator set to 100 kHz for minimal inductor size. Use Value: Delivers 500 mA output with >85% efficiency and tight line/load regulation (±0.05%) under varying battery discharge. |
| Automotive Aftermarket Lighting | Legacy System Voltage Inversion |
Use Scenario: Driving white LED arrays from 12 V vehicle battery in headlight control modules requiring constant-current regulation. IC Role / Device Role / Timing Role: Configured as constant-current boost converter; feedback loop modified to sense LED current via shunt resistor at Pin 8. Use Value: Provides stable LED brightness across 9–16 V input range with built-in overcurrent protection preventing thermal runaway. | Use Scenario: Generating −12 V rail from +5 V logic supply for legacy RS-232 transceivers or op-amp biasing in embedded controllers. IC Role / Device Role / Timing Role: Voltage-inverting controller with Pin 1 connected to inductor, Pin 2 to ground, and output rectified via external diode/capacitor. Use Value: Achieves clean −12 V @ 100 mA with <70 mVpp ripple and 62% efficiency - sufficient for low-noise analog subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AD | Same architecture and pinout; wider operating ambient range (0°C to +70°C vs. −40°C to +85°C for MC33063A). | Suitable for commercial-grade applications where extended temperature is not required. | Select MC34063AD if operating environment stays within 0–70°C and cost sensitivity favors commercial-grade qualification. |
| LM2574N-5.0 | Fixed 5 V output, integrated switch, lower quiescent current (7.5 mA), but no adjustable frequency or inverting capability. | Limited to step-down only; lacks flexibility for boost/inverting topologies and fine-tuned frequency control. | Choose LM2574N-5.0 only for simple 5 V buck conversion where topology and frequency flexibility are unnecessary. |
Compared with MC34063AD and LM2574N-5.0, the MC33063AD offers broader temperature support and full topology flexibility (buck/boost/invert), making it preferable for industrial designs requiring reliability across −40°C to +85°C and multiple voltage conversion schemes.
Availability
MC33063AD is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, automotive aftermarket lighting, and legacy system voltage inversion requiring stable component supply and long-term manufacturability.
Supply support for MC33063AD 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC33063A series was engineered as a general-purpose, low-component-count DC-DC controller targeting cost-sensitive industrial and consumer power conversion where design simplicity and wide input range are critical.
FAQ
What is the maximum switching frequency supported by the MC33063AD?
The MC33063AD supports oscillator frequencies up to 100 kHz, determined by the external timing capacitor (CT) value and supply voltage. At VCC = 5 V and CT = 1.0 nF, typical frequency is 33 kHz; higher values reduce frequency, lower values increase it - but operation beyond 100 kHz is not guaranteed per datasheet specifications.
Can the MC33063AD be used in a voltage-inverting configuration?
Yes, the MC33063AD is explicitly designed for voltage-inverting applications. Figure 13 in the datasheet shows a working inverter circuit generating −12 V from a 4.5–6.0 V input, achieving 100 mA output with 62.2% efficiency and <70 mVpp ripple - confirming validated inverting topology support.
What is the purpose of Pin 5 (Driver Collector) on the MC33063AD?
Pin 5 is the collector of the internal driver transistor. It allows external connection to a higher-current NPN or PNP transistor to extend peak switch current beyond the internal 1.5 A limit - as shown in Figures 10, 12, and 14 for applications requiring >1.5 A output.
How does the current limit function work on the MC33063AD?
The MC33063AD senses current through an external resistor (RSC) between Pin 2 (Switch Emitter) and Pin 6 (Ipk Sense). When voltage across RSC reaches ~300 mV (typical), the internal comparator triggers current limiting, reducing duty cycle to protect the switch - a core feature confirmed in Electrical Characteristics Table and Figure 7.
Is the MC33063AD RoHS compliant and lead-free?
Yes, the MC33063AD is RoHS compliant and Pb-free, as stated in the datasheet features section and ordering information - indicated by the "G" suffix in part numbers like MC33063ADR2G and confirmed in the "Pb-Free Package" designation for SOIC-8 packaging.
MC33063AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC33063AD FAQ
1.How can I place an order for MC33063AD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063AD 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 MC33063AD reliable?
The price and inventory of MC33063AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AD is usually 5 days.
3.What payment methods are accepted for MC33063AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063AD?
MC33063AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063AD 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 MC33063AD?
For technical support, including MC33063AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AD requirements.
6.How does Aetrix verify that MC33063AD is sourced from the original manufacturer or authorized distributors?
All MC33063AD 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 MC33063AD meets industry standards.
7.What is the process for return or replacement of MC33063AD?
All MC33063AD units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AD, 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 MC33063AD part is unused and in its original packaging.
Return procedure for MC33063AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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