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Texas Instruments MC33063AD
- Part No.:
- MC33063AD
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063AD.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:418
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Product details
Overview
MC33063AD from Texas Instruments is a monolithic DC-DC switching regulator controller IC designed for boost, buck, and inverting topologies. It integrates a temperature-compensated 1.25-V reference (±2% tolerance), PWM controller with active current limiting, oscillator (up to 100 kHz), Darlington output switch (1.5-A peak), and driver stage. It operates from 3 V to 40 V input and supports industrial temperature range (–40°C to 85°C), commonly used in portable power supplies and embedded voltage conversion.
For engineers reviewing the MC33063AD datasheet, MC33063AD pinout, MC33063AD application, or MC33063AD equivalent, this page delivers verified electrical characteristics, validated SOIC-8 pin functions, topology-specific design constraints, thermal metrics (RθJA = 97°C/W), and real-world performance data including efficiency (62.2–87.7%), ripple suppression, and short-circuit current limiting.
Technical Context
The MC33063AD implements a fixed-frequency, current-mode PWM architecture with internal oscillator charge/discharge currents (24–42 μA / 140–260 μA) setting timing via external capacitor CT. Its comparator compares feedback voltage against the 1.25-V reference, while the IPk sense input enables cycle-by-cycle current limiting at 250–350 mV threshold.
It features dual-switch configurations: Darlington-connected (pins 1 & 8 tied) yields 1.0–1.3 V saturation voltage at 1 A; non-Darlington mode (pin 8 driven externally) achieves 0.45–0.7 V but requires forced β ≥10 to avoid saturation recovery delay >2 μs above 30 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 40 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Output Switch Current | 1.5-A peak - enables up to ~100 mA output in inverting configuration or ~500 mA in buck with proper layout and heatsinking. |
| Oscillator Frequency | Up to 100 kHz - set by CT pin; typical 24–42 kHz with 1 nF capacitor, enabling compact magnetics and EMI control. |
| Reference Voltage | 1.25 V ±2% - precision feedback node enabling stable output regulation across temperature (–40°C to 85°C). |
| Current Limit Threshold | 250–350 mV at IPk pin - sets peak switch current; allows direct sensing of external resistor voltage drop for overcurrent protection. |
| Supply Current | 4 mA max - low quiescent draw supports battery-powered standby operation without significant drain. |
| Thermal Resistance | RθJA = 97°C/W (SOIC-8) - defines junction-to-ambient rise under full load; requires PCB copper area for thermal management. |
Pinout & Package
MC33063AD is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with GND (pin 4) internally connected to the exposed thermal pad in DRJ variants - not applicable here. The SOIC-8 footprint is industry-standard and compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Switch Collector | High-current switch collector output | Connects to inductor/diode node in boost/buck/inverting topologies; handles full switch current (1.5 A peak). |
| 2: Switch Emitter | Switch emitter return path | Serves as emitter output for internal NPN switch; tied to GND in standard configurations. |
| 3: Timing Capacitor | Oscillator timing node | External capacitor (CT) sets switching frequency; value directly determines fosc (e.g., 1 nF → ~33 kHz). |
| 4: GND | Power and signal ground reference | Primary return path for internal circuits, switch emitter, and external feedback network; critical for noise immunity. |
| 5: Comparator Inverting Input | Feedback voltage input | Accepts resistor-divider voltage from output; compared to 1.25-V reference to regulate output voltage. |
| 6: VCC | Logic supply input | Tied directly to input voltage rail; powers internal circuitry; must be ≥3 V and ≤40 V. |
| 7: Ipk Sense | Current-limit detection input | Monitors voltage across external sense resistor; triggers shutdown when ≥250–350 mV. |
| 8: Driver Collector | Driver transistor collector output | Enables external NPN/PNP switch drive in high-current applications; used in non-Darlington configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Set via resistor divider on pin 5 - enables precise regulation from 1.25 V to >40 V depending on topology and component selection. |
| Short-Circuit Current Limiting | Hardware-enforced cycle-by-cycle limit - prevents damage during output faults without external circuitry. |
| Low Standby Current | ≤4 mA supply draw - minimizes battery drain in always-on portable devices such as HMIs and analyzers. |
| Multi-Topology Support | Native boost/buck/inverting operation - eliminates need for separate ICs; reduces BOM count and board space. |
| Temperature-Compensated Reference | 1.25 V ±2% over –40°C to 85°C - ensures stable regulation across industrial ambient conditions without calibration. |
Applications
| Portable Blood Gas Analyzers | Industrial Human-Machine Interfaces (HMIs) |
|---|---|
|
Use Scenario: Portable medical analyzer requiring isolated negative rail (–12 V/100 mA) from 4.5–6 V Li-ion battery. IC Role / Device Role / Timing Role: Inverting regulator controller generating stable negative output using internal switch and external diode/inductor. Use Value: Achieves 62.2% efficiency and 500 mVPP ripple without external MOSFET; optional filter reduces ripple to 70 mVPP. |
Use Scenario: Touchscreen HMI panel needing 5 V/500 mA from 25 V industrial bus with tight line/load regulation. IC Role / Device Role / Timing Role: Buck regulator controller operating at ~30 kHz, leveraging internal 1.5-A switch and adjustable feedback. Use Value: Delivers 83.7% efficiency, 12 mV line regulation, and 3 mV load regulation - meets EN 61000-6-3 conducted emission limits. |
| Telecom Cable Solutions | Consumer Portable Devices |
|
Use Scenario: DSL line card requiring +28 V/175 mA from 12 V supply with minimal external components. IC Role / Device Role / Timing Role: Boost regulator controller using internal switch and external diode/inductor; configured for high-efficiency step-up. Use Value: Provides 87.7% efficiency and 40 mVPP ripple with optional LC filter - satisfies telecom power integrity requirements. |
Use Scenario: Handheld test equipment needing dual-rail ±5 V from single 9 V battery. IC Role / Device Role / Timing Role: Dual-converter implementation: one MC33063AD in boost mode for +5 V, another in inverting mode for –5 V. Use Value: Enables compact, low-cost dual-output power supply with <1.5-A peak switch capability per channel and shared reference accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AD | Same architecture but rated for 0°C to 70°C only; identical pinout and electrical specs except temperature range. | Not suitable for extended industrial environments; acceptable for commercial-grade telecom or consumer products. | Select MC34063AD only if ambient operating temperature remains within 0–70°C and cost sensitivity outweighs reliability margin. |
| LM2574N-5.0 | Fixed 5-V output, 0.5-A switch, 52-kHz fixed frequency; no IPk sense or adjustable oscillator - simpler but less flexible. | Limited to buck-only; cannot implement boost or inverting topologies without external switch. | Choose LM2574N-5.0 only for cost-sensitive, single-output 5-V buck applications where topology flexibility is unnecessary. |
Compared with MC34063AD and LM2574N-5.0, the MC33063AD uniquely supports all three basic DC-DC topologies with user-adjustable frequency and output voltage, while maintaining industrial temperature rating and hardware current limiting - making it optimal for multi-rail, field-deployed, or battery-powered embedded systems.
Availability
MC33063AD is available at Aetrix Electronics and suitable for portable medical analyzers, industrial HMIs, telecom cable solutions, and consumer portable devices requiring stable component supply and long-term industrial-grade availability.
Supply support for MC33063AD 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in power management ICs and industrial-grade reliability.
The MC33063A product line was engineered for cost-sensitive, topology-flexible DC-DC conversion in resource-constrained embedded systems - prioritizing minimal external components, wide input range, and robust fault protection.
FAQ
What is the maximum switching frequency achievable with MC33063AD?
The MC33063AD oscillator supports frequencies up to 100 kHz, determined by the external timing capacitor (CT) and internal charge/discharge currents. With a 1-nF capacitor, typical operation is 24–42 kHz at 25°C; reducing CT lowers capacitance increases frequency, but layout parasitics and switch recovery time constrain practical upper limits to ~80 kHz in most designs.
Can MC33063AD be used in a boost converter configuration?
Yes, MC33063AD is explicitly designed for boost topology operation. Figure 10 in the datasheet shows a validated 12 V-to-28 V/175 mA step-up design achieving 87.7% efficiency. The internal 1.5-A switch, adjustable feedback, and current-limit sense enable reliable high-voltage gain with minimal external parts.
What is the purpose of the Ipk pin (pin 7) on MC33063AD?
The Ipk pin (pin 7) on MC33063AD senses voltage across an external current-sense resistor to enforce cycle-by-cycle peak current limiting. When the sensed voltage reaches 250–350 mV, the controller terminates the switch-on time, protecting the IC and external components during overload or short-circuit events - a core safety feature of the MC33063AD.
Does MC33063AD support inverting (negative-output) regulator designs?
Yes, MC33063AD natively supports inverting topology, as confirmed by Figure 8 in the datasheet: a validated –12 V/100 mA design from 4.5–6 V input. The IC's internal switch, oscillator, and feedback comparator allow direct implementation of negative outputs without additional controllers or level-shifting circuitry.
What package type is used for the MC33063AD orderable part number?
The MC33063AD is supplied in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), with tube packaging (75 units per tube). This package is RoHS-compliant, features NIPDAU lead finish, and carries MSL Level-1 rating - suitable for standard reflow processes without moisture sensitivity concerns.
MC33063AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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
MC33063AD FAQ
1.How can I place an order for MC33063AD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063AD 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 MC33063AD reliable?
The price and inventory of MC33063AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AD is usually 5 days.
3.What payment methods are accepted for MC33063AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063AD?
MC33063AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063AD 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 MC33063AD?
For technical support, including MC33063AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AD requirements.
6.How does Aetrix verify that MC33063AD is sourced from the original manufacturer or authorized distributors?
All MC33063AD 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 MC33063AD meets industry standards.
7.What is the process for return or replacement of MC33063AD?
All MC33063AD units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AD, 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 MC33063AD part is unused and in its original packaging.
Return procedure for MC33063AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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