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onsemi MC33063AP
- Part No.:
- MC33063AP
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC33063AP.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,001
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Product details
Overview
MC33063AP 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, and a 1.5 A internal switch, operating from 3.0 V to 40 V input. Used in battery-powered industrial power supplies requiring compact, low-cost regulation.
For engineers reviewing the MC33063AP datasheet, pinout, applications, or equivalent options, key selection considerations include its adjustable output voltage capability, short-circuit current limiting, low standby current, and compatibility with standard 8-DIP layout footprints.
Technical Context
The MC33063AP implements a fixed-frequency, current-mode control architecture using an internal oscillator with programmable timing capacitor (CT) and resistor (RT). Its comparator compares sensed current against a 300 mV threshold to enable cycle-by-cycle current limiting.
It features dual-stage output switching: Q1 (driver transistor) drives Q2 (main switch) with VCE(SAT) ≤ 1.30 V at 1.0 A, and supports external NPN transistor augmentation for higher current designs. The 1.24 V reference feeds into the inverting input of the error amplifier for precise output voltage 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 systems without pre-regulation. |
| Output Switch Current | 1.5 A - enables direct drive of power stage without external transistors in medium-power converters. |
| Oscillator Frequency | 100 Hz to 100 kHz - allows optimization of inductor size and efficiency via CT/RT selection. |
| Reference Voltage | 1.24 V ±3% - provides stable feedback node for accurate output voltage setting with external resistor divider. |
| Current Sense Threshold | 300 mV typical - sets overcurrent protection point with minimal sensing loss across sense resistor. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environments including motor controls and remote sensors. |
| Package Type | 8-Lead PDIP (JEDEC MS-001) - through-hole mounting compatible with legacy PCB assembly and prototyping. |
Pinout & Package
MC33063AP is housed in an 8-lead plastic dual in-line package (PDIP), compliant with JEDEC MS-001. Pin spacing is 0.100 inch (2.54 mm), body width 0.300 inch (7.62 mm), and total length 0.395 inch (10.03 mm).
| 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/inverting configurations. |
| 2 (GND) | Ground Reference | Power and signal ground return for oscillator, comparator, and driver circuits; must be low-impedance connection. |
| 3 (VCC) | Supply Input | Primary power input for internal circuitry; bypassed externally to GND with ≥1 µF ceramic capacitor. |
| 4 (CT) | Oscillator Timing | Connects external timing capacitor to set oscillator frequency; discharge/charge currents define fOSC. |
| 5 (ISENSE) | Current Limit Sense | Monitors voltage drop across external sense resistor; triggers shutdown when ≥300 mV is detected. |
| 6 (OUT) | Driver Output | Open-collector NPN driver output; sinks current to drive external PNP or N-channel MOSFET gate/base. |
| 7 (COMP) | Error Amplifier Output | Compensation node for external RC network; stabilizes feedback loop and adjusts transient response. |
| 8 (VREF) | Reference Output | Provides 1.24 V bandgap reference; used as feedback reference point for output voltage divider. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Set via external resistor divider from VREF (1.24 V); supports any output from ~1.25 V up to >VIN in boost mode. |
| Short-Circuit Protection | Automatic foldback via ISENSE pin; limits peak switch current to prevent thermal runaway during fault conditions. |
| Low Standby Current | Typical 5 mA supply current across full input range - reduces no-load power loss in always-on systems. |
| Integrated High-Current Switch | 1.5 A rated switch eliminates need for external pass transistor in sub-5 W applications, simplifying BOM and layout. |
| Temperature-Compensated Reference | 1.24 V ±3% over −40°C to +85°C - ensures stable regulation across environmental extremes without external trimming. |
Applications
| Industrial Sensor Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Providing isolated 5 V rail from 12 V vehicle battery to power analog sensor front-ends and microcontrollers. IC Role / Device Role / Timing Role: Step-down DC-DC controller regulating output with current-mode feedback and thermal-safe shutdown. Use Value: Enables single-chip solution with <1.3 V saturation loss and 300 mV current limit threshold for predictable fault behavior. | Use Scenario: Generating −5 V bias for op-amp level-shifting circuits in LIN bus interface modules. IC Role / Device Role / Timing Role: Inverting regulator controller using external inductor and diode to produce negative output from positive input. Use Value: Leverages internal 1.5 A switch and 100 kHz max frequency to minimize magnetic component size while maintaining EMI compliance. |
| Portable Medical Instrument | Legacy Industrial PLC I/O Module |
Use Scenario: Boosting 3.3 V Li-ion battery output to 12 V for driving small solenoids and relays in handheld diagnostic tools. IC Role / Device Role / Timing Role: Step-up controller with adjustable frequency and external compensation for fast load-step response. Use Value: Delivers regulated 12 V at up to 350 mA with <5 mA quiescent current, extending battery runtime significantly. | Use Scenario: Replacing aging linear regulators in retrofit I/O expansion cards where board space and heat dissipation are constrained. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 78xx series with external inductor-based switching efficiency. Use Value: Reduces thermal load by >60% compared to linear regulation at 500 mA load, enabling use of existing 8-DIP footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SMPS controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AP | Same architecture but rated for 0°C to +70°C only; 1.24 V reference tolerance ±5% vs. ±3% for MC33063AP. | Limited to commercial-temperature environments; less suitable for under-hood or outdoor industrial enclosures. | Select when cost sensitivity outweighs extended temperature requirement and design margin permits looser reference accuracy. |
| LM2574N-5.0 | Fixed 5 V output; no external feedback divider needed; higher efficiency due to optimized internal switch and lower dropout. | Not adjustable - restricts use to fixed-output systems; lacks inverting/step-up flexibility of MC33063AP. | Prefer for dedicated 5 V point-of-load conversion where simplicity and efficiency supersede topology flexibility. |
Compared with MC34063AP and LM2574N-5.0, the MC33063AP uniquely balances wide input range, adjustable topology support, and extended temperature operation - making it optimal for ruggedized, multi-rail embedded power designs where layout reuse and thermal robustness are critical.
Availability
MC33063AP is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive body control modules, and portable medical instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33063AP 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 components before its acquisition by ON Semiconductor in 2016.
The MC33063A product line was developed for cost-sensitive, general-purpose DC-DC converter applications requiring high reliability, wide input voltage range, and flexible topology support in industrial and automotive systems.
FAQ
What is the maximum output current achievable with MC33063AP without external transistors?
The MC33063AP integrates a 1.5 A output switch, allowing up to 1.5 A peak switch current. However, practical continuous output current depends on thermal design, duty cycle, and external components. At 50% duty cycle and ambient temperature ≤60°C with adequate copper pour, sustained output of ~350 mA at 12 V (boost) or ~600 mA at 5 V (buck) is achievable. Always verify with worst-case thermal simulation for the MC33063AP in your specific layout.
Can MC33063AP be used in an inverting configuration?
Yes, the MC33063AP supports inverting regulator topologies per its official application circuits. In this mode, the SW pin connects to the inductor, the diode cathode ties to ground, and the output is taken from the inductor–diode junction referenced to ground. The MC33063AP's current-sense and oscillator architecture remain fully functional, enabling stable negative output generation from a positive input - commonly used for op-amp bias rails and sensor interfaces.
What is the purpose of the COMP pin on MC33063AP?
Pin 7 (COMP) is the error amplifier output node used for loop compensation. It connects to an external RC network between COMP and VREF to stabilize the feedback control loop. Proper compensation prevents oscillation and ensures adequate phase margin during load transients. The MC33063AP datasheet specifies standard Type II compensation values; incorrect RC selection can cause instability or poor transient response in the MC33063AP-based regulator.
Does MC33063AP require a minimum load to maintain regulation?
No, the MC33063AP does not require a minimum load for regulation. Its current-mode control and oscillator operate reliably down to zero load, with typical quiescent supply current of 5 mA. However, light-load efficiency drops due to fixed switching losses, and output ripple may increase slightly. For ultra-low-power standby modes, consider adding a load switch downstream of the MC33063AP rather than relying on minimum-load requirements.
How does the current limit function in MC33063AP?
The MC33063AP implements cycle-by-cycle current limiting via the ISENSE (pin 5) input. A voltage proportional to switch current develops across an external sense resistor; when this exceeds ~300 mV, the internal comparator disables the output switch for that cycle. This protects against short circuits and inductor saturation. The MC33063AP's 300 mV threshold ensures low power loss in the sense resistor while delivering precise, repeatable current limiting across temperature.
MC33063AP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-DIP
MC33063AP FAQ
1.How can I place an order for MC33063AP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063AP 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 MC33063AP reliable?
The price and inventory of MC33063AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AP is usually 5 days.
3.What payment methods are accepted for MC33063AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063AP?
MC33063AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063AP 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 MC33063AP?
For technical support, including MC33063AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AP requirements.
6.How does Aetrix verify that MC33063AP is sourced from the original manufacturer or authorized distributors?
All MC33063AP 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 MC33063AP meets industry standards.
7.What is the process for return or replacement of MC33063AP?
All MC33063AP units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AP, 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 MC33063AP part is unused and in its original packaging.
Return procedure for MC33063AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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