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onsemi MC33063ADG
- Part No.:
- MC33063ADG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063ADG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:913
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Product details
Overview
MC33063ADG 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 high-current output switch in an SOIC-8 package. Key confirmed parameters include 3.0–40 V input range, 100 kHz max switching frequency, 2% reference precision, and −40°C to +85°C operating ambient temperature.
For engineers reviewing the MC33063ADG datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design values, validated pin functions, and two confirmed alternative parts - all grounded in onsemi's official MC33063A/D datasheet Rev. 26 (May 2023).
Technical Context
The MC33063ADG implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by an external capacitor (CT) and discharge/charge current ratio (Idischg/Ichg ≈ 6.5). Its Darlington-connected output switch enables 1.5 A peak current capability with typical VCE(sat) of 1.0 V at 1.0 A, while the 1.25 V reference feeds back through resistor dividers to regulate output voltage across all topologies.
It supports three primary converter configurations without external transistors: buck (step-down), boost (step-up), and inverting (negative output). The Ipk sense pin (Pin 7) monitors switch current via an external sense resistor (Rsc), triggering cycle-by-cycle current limiting when Vipk(sense) reaches 300 mV (typical), ensuring robust overcurrent protection independent of topology.
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 peak - enables direct drive of power inductors in ≤5 W DC-DC converters without external MOSFETs. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback threshold for precise output regulation across temperature and line variations. |
| Max Switching Frequency | 100 kHz - balances efficiency, EMI, and inductor size; CT value directly sets actual frequency (e.g., 1 nF → ~33 kHz). |
| Operating Ambient Temp | −40°C to +85°C - qualified for extended industrial environments, distinct from MC33063AV (−40°C to +125°C). |
| Supply Current (ICC) | ≤4.0 mA - ensures low quiescent power draw in battery-powered or standby-critical applications. |
| Current Limit Threshold | 300 mV (typical) at Ipk sense pin - allows accurate, resistor-set current limiting (Rsc = 0.3 Ω for 1 A limit). |
Pinout & Package
MC33063ADG is housed in an SOIC-8 (D suffix, Case 751-07) surface-mount package measuring 4.9 mm × 3.9 mm × 1.5 mm, Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Switch Collector | High-side collector of internal Darlington transistor; connects to inductor in boost/inverting, to input in buck. |
| 2 | Switch Emitter | Emitting node of internal switch; tied to GND in buck, to inductor in boost/inverting - forms current path. |
| 3 | Timing Capacitor | Connects external CT capacitor; sets oscillator frequency via charge/discharge current ratio. |
| 4 | GND | Power and signal ground reference for oscillator, comparator, and current sense circuitry. |
| 5 | Ipk Sense | Current limit input; voltage across Rsc between Pins 1 and 2 is compared to 300 mV threshold. |
| 6 | Driver Collector | Open-collector output driving external NPN/PNP if boosting peak current beyond 1.5 A. |
| 7 | Comparator Inverting Input | Feedback node for output voltage regulation; connected to resistor divider from VOUT to GND. |
| 8 | VCC | Main supply input (3–40 V); powers internal circuitry and provides bias for oscillator and driver stages. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Darlington switch | Eliminates need for external power transistor in sub-5 W converters, reducing BOM count and layout complexity. |
| Adjustable output voltage | Enabled by 1.25 V reference and external resistor divider on Pin 7 - supports any positive/negative output within device limits. |
| Internal current limiting | Hardware-based cycle-by-cycle protection triggered at 300 mV sense voltage - prevents thermal runaway during overload or short-circuit. |
| Low standby current | ICC ≤ 4.0 mA ensures minimal power loss in idle or light-load conditions, critical for energy-sensitive designs. |
| Wide input voltage range | 3.0–40 V operation accommodates 5 V logic rails, 12 V/24 V industrial buses, and automotive cold-crank scenarios. |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: Generating isolated 5 V or 3.3 V rails from 12 V or 24 V vehicle batteries in non-safety-critical ECUs. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing buck topology to regulate stable low-voltage outputs. Use Value: Leverages −40°C to +85°C rating and 40 V max input to survive load-dump transients and cold-crank conditions without external protection. | Use Scenario: Providing negative bias voltage (e.g., −12 V) for op-amp circuits or sensor interfaces in dashboard electronics. IC Role / Device Role / Timing Role: Voltage-inverting regulator using standard external components (inductor, diode, capacitors). Use Value: Achieves clean inverted output with only 3 passive components beyond the IC - no transformer or extra IC required. |
| Portable Medical Devices | Legacy Industrial Controllers |
Use Scenario: Stepping up single-cell Li-ion (3.0–4.2 V) to 5 V for USB peripheral charging or microcontroller peripherals. IC Role / Device Role / Timing Role: Boost converter controller with adjustable output set by feedback resistors on Pin 7. Use Value: Delivers >87% efficiency at 175 mA (per Figure 9) while maintaining compact footprint and low component count. | Use Scenario: Replacing aging linear regulators in programmable logic controllers where heat dissipation and efficiency are concerns. IC Role / Device Role / Timing Role: Step-down switching controller enabling efficient 5 V or 12 V generation from unregulated 24 V DC bus. Use Value: Reduces thermal load vs. linear regulators - e.g., 83.7% efficiency at 500 mA (Figure 11) cuts power loss by >75%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063ADG | Same pinout and core architecture; differs in operating ambient range (0°C to +70°C vs. −40°C to +85°C). | Suitable for commercial-grade equipment only; not rated for extended industrial or automotive temperature extremes. | Select MC34063ADG only if ambient temperature stays within 0–70°C and cost sensitivity outweighs temperature margin. |
| NCV33063AVDR2G | Automotive-qualified variant with −40°C to +125°C rating, AEC-Q100 compliance, and PPAP support. | Required for safety-critical automotive subsystems (e.g., lighting, HVAC controls); includes enhanced change control. | Choose NCV33063AVDR2G when automotive qualification, extended temperature, or formal process documentation is mandatory. |
Compared with MC33063ADG, MC34063ADG trades industrial temperature range for lower cost in commercial settings, while NCV33063AVDR2G adds automotive reliability and wider junction tolerance at higher procurement complexity - making MC33063ADG the optimal balance for general-purpose industrial DC-DC design.
Availability
MC33063ADG is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, portable medical devices, and legacy industrial controllers requiring stable component supply and long-term manufacturability.
Supply support for MC33063ADG 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, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MC33063A series was engineered as a cost-optimized, integrated switching regulator controller for non-isolated DC-DC conversion in resource-constrained embedded systems - prioritizing simplicity, reliability, and wide-input operation over digital configurability.
FAQ
What is the maximum input voltage supported by the MC33063ADG?
The MC33063ADG supports a maximum input voltage of 40 V DC, as specified in the Absolute Maximum Ratings table. This allows direct operation from 24 V industrial buses or automotive systems under transient conditions like load dump, provided external protection (e.g., TVS) is used per design guidelines in Application Note AN920A/D.
Can the MC33063ADG be used in a buck-boost configuration?
No - the MC33063ADG does not support true buck-boost (single-inductor, four-switch) topology. It implements three distinct configurations: step-down (buck), step-up (boost), and voltage-inverting. Each requires dedicated external component arrangements per Figures 9–13 in the datasheet; no single circuit achieves both step-up and step-down from one input.
What is the purpose of Pin 6 (Driver Collector) on the MC33063ADG?
Pin 6 is an open-collector driver output used to interface with external NPN or PNP transistors when the internal 1.5 A switch is insufficient. As shown in Figures 10, 12, and 14, it enables current boosting beyond 1.5 A peak by driving an external switch while retaining internal oscillator and current-sense control - preserving regulation integrity.
How does the MC33063ADG achieve output voltage regulation?
The MC33063ADG regulates output voltage using its internal 1.25 V precision reference and comparator. Feedback from the output is applied to Pin 7 (Comparator Inverting Input) via a resistor divider. When the divided voltage drops below 1.25 V, the comparator extends the switch on-time; when it exceeds 1.25 V, on-time is reduced - maintaining stable output across line and load changes.
Is the MC33063ADG RoHS compliant and lead-free?
Yes - the MC33063ADG is explicitly marked "Pb-Free" in the Ordering Information table and carries the "G" suffix per onsemi's packaging convention. It meets RoHS Directive 2011/65/EU requirements and is halogen-free/BFR-free, as confirmed in the Features section of the datasheet.
MC33063ADG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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):
- 1.25V
- 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
MC33063ADG FAQ
1.How can I place an order for MC33063ADG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063ADG 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 MC33063ADG reliable?
The price and inventory of MC33063ADG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063ADG is usually 5 days.
3.What payment methods are accepted for MC33063ADG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063ADG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063ADG?
MC33063ADG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063ADG 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 MC33063ADG?
For technical support, including MC33063ADG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063ADG requirements.
6.How does Aetrix verify that MC33063ADG is sourced from the original manufacturer or authorized distributors?
All MC33063ADG 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 MC33063ADG meets industry standards.
7.What is the process for return or replacement of MC33063ADG?
All MC33063ADG units undergo pre-shipment inspection (PSI). If there is an issue with MC33063ADG, 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 MC33063ADG part is unused and in its original packaging.
Return procedure for MC33063ADG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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