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onsemi MC33063AVP
- Part No.:
- MC33063AVP
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC33063AVP.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,566
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Product details
Overview
MC33063AVP from onsemi is a monolithic DC-DC switching regulator IC supporting step-up, step-down, and 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. Designed for industrial power conversion, it operates from 3.0 V to 40 V input and delivers adjustable output voltage with up to 100 kHz switching frequency.
For engineers reviewing the MC33063AVP datasheet, pinout, applications, or equivalent options, key selection considerations include its −40 °C to +125 °C operating ambient range, 1.5 A internal switch current capability, Darlington saturation behavior, timing capacitor-based frequency control, and compatibility with external NPN/PNP boost configurations.
Technical Context
The MC33063AVP implements a fixed-frequency, current-mode controlled oscillator with charge/discharge currents (35 µA typ / 220 µA typ) setting timing via an external capacitor (CT). Its internal Darlington output switch enables high-current switching without external drive circuitry, while the 1.25 V precision reference (±2%) and comparator enable stable feedback regulation across all three converter modes.
Current limiting is achieved through peak-sense voltage detection at Pin 7 (Ipk Sense), with a nominal threshold of 300 mV. The device supports both internal switching (Darlington mode) and external transistor configurations-enabling >1.5 A peak current handling when required-and maintains operation over its full industrial temperature range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery-supplied systems |
| Output Switch Current | 1.5 A - sufficient for medium-power DC-DC converters without external boost transistors |
| Reference Voltage | 1.25 V ±2% - enables precise output voltage setting using two-resistor feedback divider |
| Switching Frequency | Up to 100 kHz - balances efficiency, EMI, and inductor size in cost-sensitive designs |
| Operating Ambient Range | −40 °C to +125 °C - qualified for extended industrial and under-hood automotive environments |
| Current Limit Threshold | 300 mV typical at Ipk Sense pin - sets accurate overcurrent protection independent of supply voltage |
| Standby Supply Current | ≤4.0 mA - minimizes quiescent loss in battery-powered or always-on applications |
Pinout & Package
MC33063AVP is supplied in an 8-pin PDIP package (Case 626), with lead spacing of 0.100 inch and body dimensions 0.355 × 0.400 inches. This through-hole package supports manual prototyping and legacy board assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Collector) | Collector of internal Darlington switch | Connects to inductor/transformer primary in step-up/inverting; to input in step-down |
| 2 (Switch Emitter) | Emitting node of internal Darlington switch | Serves as return path for switch current; tied to GND in standard step-down configuration |
| 3 (Timing Capacitor) | Oscillator timing node | External capacitor (CT) sets switching frequency via charge/discharge current ratio |
| 4 (GND) | Power and signal ground reference | Common return for internal circuits, feedback network, and external components |
| 5 (Comparator Inverting Input) | Feedback voltage input | Compares divided output voltage against 1.25 V reference to regulate output |
| 6 (Ipk Sense) | Current limit sense input | Detects voltage drop across external sense resistor to terminate switch conduction |
| 7 (Driver Collector) | Driver stage collector output | Drives external NPN transistor in boosted-current configurations |
| 8 (VCC) | Positive supply input | Power source for internal logic, reference, and oscillator; must be ≥3.0 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Darlington switch | Eliminates need for external driver transistors in ≤1.5 A applications |
| Adjustable output voltage | Enabled by 1.25 V reference and external resistor divider on Pin 5 |
| Temperature-compensated reference | Maintains ±2% accuracy over −40 °C to +125 °C ambient range |
| Low standby current | Reduces system-level power consumption during light-load or sleep conditions |
| Robust current limiting | 300 mV threshold ensures predictable overcurrent response across voltage and temperature |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: Converting 12 V vehicle battery to regulated 5 V or 3.3 V for microcontrollers and sensors in non-safety-critical modules. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing step-down topology with integrated switch and current sensing. Use Value: Eliminates external MOSFET and gate driver, reducing BOM count and PCB area while meeting −40 °C to +125 °C ambient requirement. | Use Scenario: Generating negative rail (e.g., −12 V) from 5 V supply for analog sensor biasing or op-amp dual supplies. IC Role / Device Role / Timing Role: Voltage-inverting regulator using internal Darlington switch and external diode/inductor. Use Value: Achieves stable inverted output with only four passive components beyond the IC, leveraging built-in oscillator and reference. |
| Point-of-Load Converters | Legacy Equipment Retrofit |
Use Scenario: Stepping down 24 V industrial bus to 15 V for actuator drivers or motor control logic. IC Role / Device Role / Timing Role: Step-down switching regulator with adjustable output set by R1/R2 feedback network. Use Value: Delivers 500 mA at 83.7% efficiency (per Figure 11 test data), with <12 mV line regulation and minimal external parts. | Use Scenario: Replacing obsolete linear regulators in aging instrumentation where heat dissipation and efficiency are critical. IC Role / Device Role / Timing Role: High-efficiency switching alternative to 78xx series, configured as step-down with external inductor and diode. Use Value: Reduces thermal load by >60% vs. linear solution while maintaining same footprint and pin-compatible replacement path in PDIP-8 sockets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AP1G | Same architecture but rated for 0 °C to +70 °C ambient; no extended temperature qualification | Limited to commercial-grade equipment; not suitable for under-hood or outdoor industrial use | Select when cost is prioritized over temperature range and automotive compliance is not required |
| NCV33063AVDR2G | AEC-Q100 qualified; guaranteed −40 °C to +125 °C operation; PPAP-capable | Designed specifically for automotive safety-critical subsystems requiring change control and traceability | Choose for automotive OEM programs where qualification documentation and site-controlled manufacturing are mandatory |
Compared with MC33063AVP, MC34063AP1G offers identical functionality at lower cost but lacks extended temperature support, while NCV33063AVDR2G adds AEC-Q100 compliance and PPAP readiness-making it suitable for automotive production but requiring tighter supply chain controls.
Availability
MC33063AVP is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, point-of-load converters, and legacy equipment retrofit requiring stable component supply and long-term manufacturability.
Supply support for MC33063AVP 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC33063A series was developed to provide robust, low-cost DC-DC conversion for industrial and automotive applications where reliability, wide temperature operation, and minimal external components are essential.
FAQ
What is the maximum output current achievable with MC33063AVP in step-down configuration?
The MC33063AVP supports up to 1.5 A peak switch current internally. In step-down configuration, continuous output current depends on thermal design and duty cycle but typically reaches 500 mA at 83.7% efficiency (per Figure 11 test data with 25 V input). For higher loads, external NPN transistor boosting (Figure 10) extends capability beyond 1.5 A while retaining MC33063AVP as controller.
Does MC33063AVP require an external diode in step-up topology?
Yes, MC33063AVP requires an external diode in step-up configuration. As shown in Figure 9, a Schottky diode (e.g., 1N5819) is used to steer inductor energy to the output capacitor during switch-off periods. The IC itself contains no integrated rectifier; the diode must be selected for appropriate forward voltage, reverse voltage rating, and switching speed.
Can MC33063AVP operate with input voltage below 3.0 V?
No, MC33063AVP has a minimum specified input voltage of 3.0 V per its Absolute Maximum Ratings table. Operation below this level may result in failure to start, unstable oscillation, or incorrect reference/comparator behavior. For sub-3 V applications, alternative regulators such as the MC33063A's successor family (e.g., NCP3063) or low-VIN buck controllers should be considered.
How is output voltage adjusted on MC33063AVP?
Output voltage is adjusted using a resistive divider from output to Pin 5 (Comparator Inverting Input) and from Pin 5 to GND. With the internal 1.25 V reference applied to the comparator's non-inverting input, the divider sets VOUT = 1.25 V × (1 + R1/R2). Example values from Figure 11 (R1 = 1.2 kΩ, R2 = 3.6 kΩ) yield 5.0 V output. Precision resistors improve regulation accuracy.
What is the purpose of the timing capacitor (CT) connected to Pin 3 of MC33063AVP?
The timing capacitor (CT) on Pin 3 determines switching frequency by controlling the oscillator's charge/discharge cycle. Internal currents (≈35 µA charge / ≈220 µA discharge) ramp CT voltage between thresholds, setting on/off times. Frequency scales inversely with CT value-e.g., 470 pF yields ~50 kHz (Figure 3), while 1500 pF yields ~25 kHz-allowing optimization for efficiency, size, or EMI.
MC33063AVP 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):
- 1.25V
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MC33063AVP FAQ
1.How can I place an order for MC33063AVP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063AVP 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 MC33063AVP reliable?
The price and inventory of MC33063AVP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AVP is usually 5 days.
3.What payment methods are accepted for MC33063AVP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AVP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063AVP?
MC33063AVP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063AVP 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 MC33063AVP?
For technical support, including MC33063AVP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AVP requirements.
6.How does Aetrix verify that MC33063AVP is sourced from the original manufacturer or authorized distributors?
All MC33063AVP 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 MC33063AVP meets industry standards.
7.What is the process for return or replacement of MC33063AVP?
All MC33063AVP units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AVP, 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 MC33063AVP part is unused and in its original packaging.
Return procedure for MC33063AVP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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