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onsemi MC33063ADR2
- Part No.:
- MC33063ADR2
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063ADR2.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,967
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Product details
Overview
MC33063ADR2 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 (±2%), 1.5 A output switch, current-limit sensing at 300 mV typ, oscillator up to 100 kHz, and comparator with 20 nA input bias. It operates from 3.0 V to 40 V input and delivers stable regulation in automotive-grade power supplies.
For engineers reviewing the MC33063ADR2 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.5 A internal switch capability, −40°C to +85°C operating range, SOIC-8 package thermal resistance (RJA = 160°C/W), and compatibility with external NPN/PNP boost configurations for >1.5 A peak current.
Technical Context
The MC33063ADR2 implements a fixed-frequency, current-mode control architecture using an internal oscillator with timing capacitor (CT) programming, a precision 1.25 V reference feeding a high-gain comparator, and a Darlington-connected bipolar output switch. Its active current limit circuit monitors voltage across an external sense resistor (RSC) with a nominal 300 mV threshold.
It supports three fundamental converter configurations without external driver transistors: step-up (boost), step-down (buck), and voltage-inverting (buck-boost). The device's internal driver collector (Pin 7) and switch emitter (Pin 2) allow flexible external transistor interfacing for higher current or voltage handling beyond its native 1.5 A/40 V limits.
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 |
| Output Switch Current | 1.5 A max - enables direct drive of medium-power converters without external boost transistors |
| Reference Voltage | 1.25 V ±2% - sets output voltage accuracy via R1/R2 feedback divider in all topologies |
| Oscillator Frequency | Up to 100 kHz - allows use of standard low-cost inductors and reduces EMI vs higher-frequency alternatives |
| Current Limit Threshold | 300 mV typ - defines overcurrent protection point with external RSC = 0.2 Ω for 1.5 A trip |
| Operating Temperature | −40°C to +85°C - qualified for extended-temperature industrial applications (MC33063A grade) |
| Supply Current (Standby) | <4.0 mA - minimizes quiescent loss in battery-powered or always-on systems |
Pinout & Package
MC33063ADR2 is housed in an 8-pin SOIC-8 (Case 751) package with exposed pad not present; thermal resistance RJA = 160°C/W at TA = 25°C. Pin functions are validated per onsemi datasheet Rev. 24 (2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Collector) | High-side switch collector node | Connects to inductor in step-up, to input in step-down, and to ground in inverting config |
| 2 (Switch Emitter) | Switch emitter return path | Common emitter node; tied to GND in standard Darlington configuration |
| 3 (Timing Capacitor) | Oscillator timing node | CT capacitor sets oscillator frequency; discharge/charge currents define fosc |
| 4 (GND) | Analog and power ground reference | Single ground plane required; separate from high-current return paths for stability |
| 5 (Comparator Inverting Input) | Feedback voltage input | Accepts divided output voltage; compares to 1.25 V reference for regulation |
| 6 (Ipk Sense) | Current limit sense input | Monitors voltage across RSC; triggers shutdown when ≥300 mV |
| 7 (Driver Collector) | External transistor driver output | Drives base of external NPN/PNP for current boosting beyond 1.5 A |
| 8 (VCC) | Power supply input | Supplies internal circuitry; must be bypassed with ≥100 nF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Darlington switch | Eliminates need for external power transistor in ≤1.5 A applications, reducing BOM count and layout area |
| Adjustable output voltage | Set via two-resistor divider from output to Pin 5; supports any VOUT ≥1.25 V in all topologies |
| Programmable oscillator (≤100 kHz) | CT capacitor value directly controls switching frequency, enabling optimization of efficiency vs. size trade-offs |
| Low 20 nA comparator input bias | Minimizes divider current error, preserving output voltage accuracy especially with high-value resistors |
| −40°C to +85°C operation | Validated performance across industrial temperature range without derating or external compensation |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Generating +12 V from 24 V truck battery for legacy sensors and actuators. IC Role / Device Role / Timing Role: Step-down (buck) regulator controlling duty cycle via feedback loop to maintain regulated 12 V output. Use Value: Leverages 40 V absolute max input rating and −40°C to +85°C operation for under-hood reliability without external HV FET. | Use Scenario: Providing isolated −12 V rail from 12 V vehicle bus for analog sensor interfaces. IC Role / Device Role / Timing Role: Voltage-inverting (buck-boost) converter using single inductor and diode to generate negative output. Use Value: Achieves rail-to-rail inversion with only 3 passive components (inductor, diode, capacitor), minimizing cost and footprint. |
| Portable Medical Instrument | Smart Building Sensor Node |
Use Scenario: Boosting 3.7 V Li-ion battery to 5.0 V for USB peripheral interface. IC Role / Device Role / Timing Role: Step-up (boost) regulator with adjustable output set by R1/R2 divider on Pin 5. Use Value: Maintains regulation down to 3.0 V input, extending usable battery life; 1.5 A switch supports peak load transients. | Use Scenario: Converting 24 V HVAC bus to 3.3 V for low-power microcontroller and RF transceiver. IC Role / Device Role / Timing Role: Step-down regulator with external PNP transistor boost (Fig. 11b) for >500 mA continuous output. Use Value: Uses Pin 7 driver output to control external PNP, enabling high-efficiency 24 V → 3.3 V conversion with minimal heat rise. |
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 |
|---|---|---|---|
| MC34063ADR2G | Wider operating ambient range (0°C to +70°C); identical electrical specs and pinout | Not qualified for −40°C start-up; suitable for commercial-grade equipment only | Select when industrial temperature range is unnecessary and cost sensitivity favors standard grade |
| NCV33063AVDR2G | Automotive-qualified (AEC-Q100); extended temp range (−40°C to +125°C); same SOIC-8 package | Higher screening cost; required for safety-critical automotive body electronics | Choose for automotive applications requiring PPAP documentation and guaranteed high-temp operation |
Compared with MC33063ADR2, MC34063ADR2G lacks extended temperature support but offers identical functionality at lower cost for non-industrial use, while NCV33063AVDR2G adds AEC-Q100 qualification and +125°C junction capability-critical for engine bay or ADAS subsystems where thermal margin is constrained.
Availability
MC33063ADR2 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, portable medical instruments, and smart building sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for MC33063ADR2 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC33063A series was designed as a cost-optimized, robust DC-DC controller for non-isolated buck, boost, and inverting converters in resource-constrained industrial and automotive applications where simplicity and reliability are prioritized over ultra-high efficiency or MHz switching.
FAQ
What is the maximum output current achievable with MC33063ADR2 in a step-up configuration?
The MC33063ADR2 supports up to 1.5 A peak switch current internally. In a standard step-up configuration with no external transistor, continuous output current depends on duty cycle, input voltage, and efficiency-but typically reaches ~175 mA at 28 V output from 12 V input (per Figure 9). For higher output current, the MC33063ADR2 can drive an external NPN transistor via Pin 7, enabling >1.5 A peak capability as shown in Figures 10 and 12.
Does MC33063ADR2 require an external diode in all converter topologies?
Yes, the MC33063ADR2 requires an external diode in all standard configurations: a Schottky diode (e.g., 1N5819) is used in step-up and voltage-inverting topologies for freewheeling, while a standard PN diode suffices in step-down mode. The diode is essential for energy transfer during the switch-off phase and is not integrated into the MC33063ADR2 die.
Can MC33063ADR2 operate with an input voltage below 3.0 V?
No, the MC33063ADR2 has a specified minimum input voltage of 3.0 V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3.0 V is not guaranteed: internal reference and oscillator circuits may fail to start or regulate correctly, and the output switch may not saturate properly. For sub-3 V applications, alternative regulators such as the MC33063A's successor family should be evaluated.
How is the switching frequency of MC33063ADR2 set, and what is its tolerance?
The switching frequency of MC33063ADR2 is set by a single external timing capacitor (CT) connected to Pin 3. With CT = 1.0 nF, fosc is 24–42 kHz (typ 33 kHz) at 25°C. Frequency varies with CT value, supply voltage, and temperature; Figure 3 shows fosc vs. CT across 0.1–10 nF. Tolerance is process- and temperature-dependent-not specified as a fixed %, so designs must verify frequency under worst-case conditions.
Is MC33063ADR2 RoHS compliant and lead-free?
Yes, MC33063ADR2 is RoHS compliant and Pb-free, as confirmed in the Ordering Information table (suffix "G") and Features section of the datasheet. It is also halogen-free and BFR-free, meeting modern environmental compliance requirements for industrial and automotive electronics without requiring special handling or exemptions.
MC33063ADR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC33063ADR2 FAQ
1.How can I place an order for MC33063ADR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063ADR2 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 MC33063ADR2 reliable?
The price and inventory of MC33063ADR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063ADR2 is usually 5 days.
3.What payment methods are accepted for MC33063ADR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063ADR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063ADR2?
MC33063ADR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063ADR2 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 MC33063ADR2?
For technical support, including MC33063ADR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063ADR2 requirements.
6.How does Aetrix verify that MC33063ADR2 is sourced from the original manufacturer or authorized distributors?
All MC33063ADR2 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 MC33063ADR2 meets industry standards.
7.What is the process for return or replacement of MC33063ADR2?
All MC33063ADR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33063ADR2, 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 MC33063ADR2 part is unused and in its original packaging.
Return procedure for MC33063ADR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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