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onsemi MC33063AVDG
- Part No.:
- MC33063AVDG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063AVDG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:295
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Product details
Overview
MC33063AVDG from onsemi is a monolithic DC-DC converter controller IC designed for buck, boost, and voltage-inverting topologies. It integrates a temperature-compensated 1.25 V reference, comparator, oscillator with active current limiting, driver, and 1.5 A Darlington output switch. Operates from 3.0 V to 40 V input, supports up to 100 kHz switching, and delivers stable regulation in automotive-grade −40°C to +125°C ambient.
For engineers reviewing the MC33063AVDG datasheet, pinout, applications, or equivalent options, key selection considerations include its wide input range, internal 1.5 A switch capability, adjustable output voltage via external resistors, thermal performance in SOIC-8 package, and suitability for cost-sensitive industrial power conversion where discrete switch control is required.
Technical Context
The MC33063AVDG implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by an external capacitor (CT) and discharge/charge currents. Its Darlington output stage enables high-current switching without external transistors in many applications, while the 1.25 V precision reference (±2%) and comparator enable accurate feedback regulation across all three topologies.
It features built-in current limiting via Ipk sense voltage (250–350 mV typ), low standby current (<4 mA), and thermal shutdown protection. The device requires only five external components for basic operation and supports external NPN/PNP boost configurations when peak current exceeds 1.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-range industrial and automotive battery inputs without pre-regulation |
| Output Switch Current | 1.5 A - integrated Darlington switch eliminates need for external power transistor in medium-power converters |
| Reference Voltage | 1.25 V ±2% - enables precise output voltage setting with standard resistor dividers |
| Switching Frequency | Up to 100 kHz - balances efficiency, size, and EMI in compact designs |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and harsh industrial environments |
| Current Limit Threshold | 300 mV typical at Ipk sense pin - provides predictable overcurrent protection independent of supply voltage |
| Supply Current (Standby) | <4.0 mA - minimizes quiescent loss in battery-powered systems |
Pinout & Package
MC33063AVDG is housed in an 8-pin SOIC-8 (Case 751-07) package with 1.27 mm pitch, 5.0 mm × 4.0 mm body, and Pb-free finish. Thermal resistance RJA = 160°C/W enables ~625 mW power dissipation at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Switch Collector | High-side collector of internal Darlington switch - connects to inductor in buck/boost/inverting topologies |
| 2 | Switch Emitter | Emitting node of internal Darlington - forms return path for switch current; tied to GND in standard configurations |
| 3 | Timing Capacitor | Connects external CT capacitor - sets oscillator frequency and duty cycle via charge/discharge timing |
| 4 | GND | Analog and power ground reference - must be low-impedance connection for stable regulation |
| 5 | Ipk Sense | Current limit detection input - monitors voltage drop across external sense resistor to trigger foldback |
| 6 | Driver Collector | Collector of internal driver transistor - used for external NPN boost configurations (not connected in standard use) |
| 7 | Comparator Inverting Input | Feedback node for output voltage regulation - connected to resistor divider from VOUT |
| 8 | VCC | Main power supply input - powers internal circuitry; bypass capacitor required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Darlington switch | Reduces BOM count and layout complexity for ≤1.5 A output converters without external transistors |
| Precision 1.25 V reference (±2%) | Enables accurate output voltage regulation across temperature and line variations |
| Adjustable switching frequency (≤100 kHz) | Allows optimization of inductor size, efficiency, and EMI filtering per application constraints |
| −40°C to +125°C operating range | Supports automotive engine compartment and industrial control cabinet deployments |
| Internal current limiting with 300 mV threshold | Provides repeatable, voltage-independent overcurrent protection without calibration |
Applications
| Automotive Body Control Module (BCM) Power Supply | Industrial Sensor Transmitter Regulator |
|---|---|
Use Scenario: Generating stable 5 V or 3.3 V rail from 12 V vehicle battery for microcontrollers and CAN transceivers in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing buck topology with internal switch; regulates output via feedback to Pin 7. Use Value: Eliminates need for external MOSFET and gate driver, reducing footprint and cost while meeting AEC-Q100 ambient temperature requirements. | Use Scenario: Providing isolated 24 V or −12 V bias for 4–20 mA loop-powered sensors in factory automation systems. IC Role / Device Role / Timing Role: Configured as voltage-inverting converter (Fig. 13) using external diode and inductor; regulated by 1.25 V reference and feedback network. Use Value: Delivers negative rail from single positive supply with minimal external parts, supporting analog signal conditioning in space-constrained enclosures. |
| Portable Medical Device Battery Booster | Legacy Industrial Equipment Retrofit Supply |
Use Scenario: Stepping up 3.7 V Li-ion battery voltage to 5 V for USB peripherals or display backlight drivers in handheld diagnostics tools. IC Role / Device Role / Timing Role: Boost converter controller (Fig. 9) with internal switch; timing set by CT capacitor, output regulated via resistor divider on Pin 7. Use Value: Achieves >87% efficiency at 175 mA load with no external power transistor, extending battery runtime in Class II medical devices. | Use Scenario: Replacing aging linear regulators in PLC I/O modules to improve thermal performance and reduce heat sink requirements. IC Role / Device Role / Timing Role: Buck converter (Fig. 11) delivering 5 V @ 500 mA from 25 V bus; uses internal switch and external Schottky diode. Use Value: Reduces power dissipation by >70% vs. linear regulator, enabling convection-cooled operation in legacy DIN-rail enclosures. |
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 architecture but rated for 0°C to +70°C ambient; lacks automotive qualification | Suitable for commercial-grade consumer or office equipment, not automotive or extended-temp industrial | Select MC34063ADG only if ambient temperature stays within 0–70°C and AEC-Q100 is not required |
| LM2574N-5.0 | Fixed 5 V output, 0.5 A internal switch, higher efficiency at light loads, no Ipk sense pin | Optimized for simple 5 V step-down; cannot support boost/inverting or adjustable outputs without external circuitry | Choose LM2574N-5.0 only for dedicated 5 V buck supplies where simplicity and light-load efficiency outweigh flexibility needs |
Compared with MC34063ADG, MC33063AVDG offers extended temperature range and automotive qualification; compared with LM2574N-5.0, it provides topology flexibility and adjustable output but requires more external components and has lower peak efficiency.
Availability
MC33063AVDG is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical instrumentation, and legacy equipment power retrofit requiring stable component supply across extended temperature ranges.
Supply support for MC33063AVDG 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, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC33063A series was developed as a robust, low-cost DC-DC controller platform for non-isolated buck, boost, and inverting converters in cost-sensitive, thermally demanding applications where integration and reliability are critical.
FAQ
What topologies does the MC33063AVDG support?
The MC33063AVDG supports buck (step-down), boost (step-up), and voltage-inverting topologies using its internal Darlington switch and external passive components. Application circuits are documented in Figures 9 (boost), 11 (buck), and 13 (inverting) of the datasheet. Each configuration uses the same IC core but differs in external component placement and feedback routing.
Does the MC33063AVDG require an external transistor for 1.5 A output current?
No - the MC33063AVDG integrates a 1.5 A Darlington output switch, eliminating the need for an external transistor in applications up to that current level. External NPN or PNP transistors are only required when peak switch current exceeds 1.5 A, as shown in Figures 10, 12, and 14.
What is the purpose of the Ipk Sense pin (Pin 5) on the MC33063AVDG?
The Ipk Sense pin (Pin 5) monitors voltage across an external current-sense resistor to implement cycle-by-cycle current limiting. When the sensed voltage reaches ~300 mV, the internal comparator triggers shutdown of the output switch, protecting against overload and short-circuit conditions in the MC33063AVDG.
Can the MC33063AVDG operate from a 3.3 V input supply?
Yes - the MC33063AVDG operates from 3.0 V to 40 V input, so 3.3 V is within specification. However, minimum input must exceed the sum of output voltage, diode forward drop, and switch saturation voltage for proper regulation. At 3.3 V input, practical output is limited to ~2.5 V in buck mode or lower in boost/inverting configurations.
Is the MC33063AVDG pin-compatible with the MC34063A series?
Yes - the MC33063AVDG shares identical pinout, electrical characteristics, and functional block diagram with MC34063A variants. The primary differences are operating temperature range (−40°C to +125°C vs. 0°C to +70°C) and qualification status (automotive-grade vs. commercial), not pin assignment or interface behavior.
MC33063AVDG 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC33063AVDG FAQ
1.How can I place an order for MC33063AVDG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063AVDG 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 MC33063AVDG reliable?
The price and inventory of MC33063AVDG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AVDG is usually 5 days.
3.What payment methods are accepted for MC33063AVDG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AVDG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063AVDG?
MC33063AVDG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063AVDG 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 MC33063AVDG?
For technical support, including MC33063AVDG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AVDG requirements.
6.How does Aetrix verify that MC33063AVDG is sourced from the original manufacturer or authorized distributors?
All MC33063AVDG 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 MC33063AVDG meets industry standards.
7.What is the process for return or replacement of MC33063AVDG?
All MC33063AVDG units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AVDG, 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 MC33063AVDG part is unused and in its original packaging.
Return procedure for MC33063AVDG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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