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onsemi MC33063MNTXG
- Part No.:
- MC33063MNTXG
- Manufacturer:
- onsemi
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MC33063MNTXG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,286
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Product details
Overview
MC33063MNTXG from onsemi is a monolithic DC-DC switching regulator controller IC designed for step-up, step-down, 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. It operates from 3.0 V to 40 V input and supports up to 100 kHz switching frequency - used in industrial power supplies, battery-powered converters, and embedded voltage translation circuits.
For engineers reviewing the MC33063MNTXG datasheet, pinout, applications, or equivalent options, key selection considerations include its DFN8 package thermal performance (RJA = 80 °C/W), adjustable output voltage via external resistor divider, ±2% reference accuracy, and guaranteed operation from −40 °C to +85 °C ambient.
Technical Context
The MC33063MNTXG implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by an external capacitor (CT) connected to Pin 3. Its Darlington output stage delivers up to 1.5 A peak switch current with typical saturation voltage of 1.0 V at 1.0 A under Darlington configuration.
It features precision 1.25 V bandgap reference (±2% tolerance), low standby current (<4.0 mA), and built-in current limiting triggered at 250–350 mV across the sense resistor (RSC). The comparator's inverting input (Pin 2) serves as the feedback node for output regulation, enabling stable closed-loop control across all three converter configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Switch Current | 1.5 A peak - enables direct drive of medium-power inductive loads in buck/boost/inverters. |
| Reference Voltage | 1.25 V ±2% - sets precise output voltage via R1/R2 divider; enables <±0.05% line regulation in tested step-up designs. |
| Switching Frequency | Up to 100 kHz - balances efficiency, EMI, and external component size; CT pin allows full design flexibility. |
| Operating Temperature | −40 °C to +85 °C - qualified for extended industrial environments; distinct from automotive-grade NCV33063A (−40 °C to +125 °C). |
| Package Thermal Resistance | RJA = 80 °C/W (DFN8) - improves power dissipation capability over SOIC-8 (160 °C/W) in space-constrained layouts. |
| Current Limit Threshold | 250–350 mV across RSC - defines accurate, temperature-stable overcurrent protection independent of supply voltage. |
Pinout & Package
MC33063MNTXG is housed in an 8-pin DFN (4 mm × 4 mm, 0.8 mm height, exposed thermal pad), case 488AF, RoHS-compliant and Pb-free. This thermally enhanced package supports higher continuous output current than SOIC-8 or PDIP-8 variants under identical PCB layout conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Switch Collector | High-side Darlington collector node | Connects to inductor/diode in boost; to input in buck; carries full switched current - requires low-inductance routing. |
| 2 - Comparator Inverting Input | Feedback node for output regulation | Connected to resistor divider midpoint; compares against 1.25 V reference to adjust duty cycle. |
| 3 - Timing Capacitor | Oscillator timing node | External CT capacitor sets oscillator frequency; discharge/charge currents define on/off times. |
| 4 - Ground | Power and signal reference plane | Must be low-impedance connection to PCB ground plane; shares return path with RSC and output filter. |
| 5 - IPk Sense | Current limit detection input | Voltage across RSC feeds here; triggers shutdown when ≥250 mV - primary overcurrent protection point. |
| 6 - Driver Collector | Internal driver transistor collector | Used only in non-Darlington external switch configurations; not connected in standard internal-switch operation. |
| 7 - VCC | Supply input for internal circuitry | Accepts 3.0–40 V; powers reference, comparator, oscillator - must be bypassed with ≥10 µF ceramic near pin. |
| 8 - Switch Emitter | Emitter of internal Darlington switch | Common emitter node; connects to RSC and GND - sets current-sense reference for IPK threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Darlington switch | Eliminates need for external high-current transistor in most ≤15 W DC-DC designs. |
| Adjustable output voltage | Set precisely via two-resistor divider; supports outputs from 1.25 V up to >40 V depending on topology. |
| Temperature-compensated 1.25 V reference | ±2% initial accuracy and low line regulation (≤6.0 mV) ensure stable output across input and load variations. |
| Programmable oscillator (up to 100 kHz) | CT pin enables optimization of efficiency vs. size vs. EMI - critical for meeting CISPR-22 Class B limits. |
| Low standby current (<4.0 mA) | Reduces no-load power loss in always-on systems such as smart sensors and remote monitoring nodes. |
Applications
| Industrial Power Supply | Battery-Powered Boost Converter |
|---|---|
Use Scenario: Generating +24 V from a 12 V rail in programmable logic controllers (PLCs) with tight board space constraints. IC Role / Device Role / Timing Role: Primary controller regulating output via feedback loop; sets switching frequency and current limit thresholds. Use Value: DFN8 package enables compact layout; 1.5 A switch handles 500 mA output with margin; ±0.05% line regulation ensures analog I/O stability. | Use Scenario: Stepping up single-cell Li-ion (3.0–4.2 V) to 5.0 V for USB peripherals in portable test equipment. IC Role / Device Role / Timing Role: Step-up controller managing energy transfer through inductor and Schottky diode; regulates output using R1/R2 divider. Use Value: Wide 3.0–40 V input accommodates full battery discharge curve; low 4.0 mA ICC extends runtime in sleep mode. |
| Voltage Inverter for Op-Amp Rails | Embedded System Buck Regulator |
Use Scenario: Creating −12 V from +5 V for dual-supply op-amps in data acquisition front-ends. IC Role / Device Role / Timing Role: Inverting topology controller; uses internal switch and external diode/inductor to generate negative output. Use Value: Confirmed 62.2% efficiency at 100 mA; ±0.012% line regulation maintains precision sensor biasing across input variation. | Use Scenario: Down-converting 24 V factory bus to 5.0 V for microcontroller and interface ICs in industrial gateways. IC Role / Device Role / Timing Role: Step-down controller operating in continuous conduction mode; manages duty cycle based on load demand. Use Value: 83.7% efficiency at 500 mA; short-circuit current limited to 1.1 A protects downstream circuitry during fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33063ADR2G | SOIC-8 package; RJA = 160 °C/W; same electrical specs and pinout. | Less suitable for high-power-density or thermally constrained designs due to higher thermal resistance. | Select when legacy SOIC footprint compatibility or hand-soldering is required. |
| NCV33063AVDR2G | Automotive-grade variant; wider −40 °C to +125 °C operating range; AEC-Q100 qualified. | Required for automotive body electronics or under-hood modules where junction temperature exceeds 85 °C. | Select for automotive OEM programs needing PPAP documentation and extended temperature validation. |
Compared with MC33063ADR2G, MC33063MNTXG offers superior thermal performance in compact layouts; compared with NCV33063AVDR2G, it provides cost-optimized industrial operation without automotive qualification overhead.
Availability
MC33063MNTXG is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered converters, embedded voltage inverters, and PLC auxiliary rails requiring stable component supply and long-term manufacturability.
Supply support for MC33063MNTXG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC33063 series belongs to onsemi's legacy analog power management portfolio, designed specifically for cost-sensitive, medium-power DC-DC conversion where simplicity, reliability, and minimal external components are prioritized over digital control or ultra-high efficiency.
FAQ
What is the maximum switching frequency supported by the MC33063MNTXG?
The MC33063MNTXG supports oscillator frequencies up to 100 kHz, set by the external timing capacitor (CT) on Pin 3. Typical operation ranges from 24 kHz to 42 kHz with a 1.0 nF capacitor at 25 °C, but design flexibility allows tuning across the full 100 kHz range using appropriate CT values and layout practices to minimize parasitic effects.
Does the MC33063MNTXG require an external MOSFET or transistor for operation?
No - the MC33063MNTXG integrates a 1.5 A Darlington bipolar output switch, eliminating the need for an external transistor in standard step-up, step-down, and inverting configurations. External switches are optional only for current boosting beyond 1.5 A or for specialized topologies like synchronous rectification.
What is the operating temperature range specified for the MC33063MNTXG?
The MC33063MNTXG is rated for operation from −40 °C to +85 °C ambient temperature. This distinguishes it from the automotive-grade NCV33063A (−40 °C to +125 °C) and the commercial MC34063A (0 °C to +70 °C), making it suitable for extended industrial environments.
How is output voltage adjusted on the MC33063MNTXG?
Output voltage is adjusted using a two-resistor feedback divider connected between output and ground, with the junction tied to Pin 2 (Comparator Inverting Input). The internal 1.25 V reference forces this node to 1.25 V, so VOUT = 1.25 V × (1 + R1/R2). This method applies identically across step-up, step-down, and inverting configurations.
Is the MC33063MNTXG pin-compatible with other members of the MC33063A family?
Yes - the MC33063MNTXG shares identical pinout and electrical functionality with all MC33063A variants (e.g., MC33063ADR2G, MC33063AP1G), including SOIC-8 and PDIP-8 packages. The DFN8 footprint differs mechanically but maintains 1:1 signal mapping across all 8 pins, enabling drop-in replacement in new designs with updated layout.
MC33063MNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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-DFN (2x2)
MC33063MNTXG FAQ
1.How can I place an order for MC33063MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063MNTXG 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 MC33063MNTXG reliable?
The price and inventory of MC33063MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063MNTXG is usually 5 days.
3.What payment methods are accepted for MC33063MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063MNTXG?
MC33063MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063MNTXG 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 MC33063MNTXG?
For technical support, including MC33063MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063MNTXG requirements.
6.How does Aetrix verify that MC33063MNTXG is sourced from the original manufacturer or authorized distributors?
All MC33063MNTXG 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 MC33063MNTXG meets industry standards.
7.What is the process for return or replacement of MC33063MNTXG?
All MC33063MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with MC33063MNTXG, 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 MC33063MNTXG part is unused and in its original packaging.
Return procedure for MC33063MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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