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onsemi MC34063ADR2G
- Part No.:
- MC34063ADR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063ADR2G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:19,128
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Product details
Overview
MC34063ADR2G from onsemi is a monolithic DC-DC converter controller IC designed for buck, boost, and inverting topologies. It integrates a temperature-compensated 1.25 V reference (±2%), comparator, oscillator with 24–42 kHz typical frequency, current-limit circuit, driver, and 1.5 A internal NPN switch. It operates from 3.0 V to 40 V input and supports adjustable output voltage in power supplies for industrial sensors, battery-powered instrumentation, and embedded voltage conversion.
For engineers reviewing the MC34063ADR2G datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, SOIC-8 package mapping, confirmed 1.5 A switch current and 1.25 V reference accuracy, real-world ripple/efficiency data from application circuits, and two validated alternative parts with documented technical differences.
Technical Context
The MC34063ADR2G implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by an external capacitor (CT) and discharge/charge current ratio (Idischg/Ichg ≈ 6.5). Its Darlington-connected output switch enables 1.5 A peak current with VCE(sat) ≤ 1.3 V at 1.0 A, while the precision 1.25 V reference feeds back via resistive divider to regulate output voltage across all three topologies.
It features active current limiting via Ipk sense voltage (300 mV typ), low standby current (<4.0 mA), and thermal shutdown protection. The device supports operation from −40°C to +85°C (MC33063A grade), with SOIC-8 package thermal resistance RJA = 160°C/W - requiring careful layout for >500 mA continuous loads.
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 converters without external MOSFETs in many applications. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback threshold for precise output voltage setting via R1/R2 divider. |
| Oscillator Frequency | 24–42 kHz (typ at CT = 1 nF) - balances efficiency, EMI, and inductor size for cost-sensitive designs. |
| Current Limit Threshold | 300 mV (typ) at Ipk sense pin - sets overcurrent protection point with ±50 mV tolerance, enabling predictable foldback. |
| Supply Current (ICC) | ≤4.0 mA - ensures low quiescent power in battery-backed or always-on systems. |
| Operating Temperature | −40°C to +85°C - qualified for industrial ambient conditions per MC33063A specification. |
Pinout & Package
MC34063ADR2G 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 1.75 mm max height. Pin 1 is marked by notch or dot; pin numbering follows standard SOIC convention (counterclockwise from notch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Collector) | Collector of internal NPN Darlington switch | Connects to inductor/diode node in boost/inverting; to input in buck - handles full switched current up to 1.5 A. |
| 2 (Switch Emitter) | Emiter of internal NPN Darlington switch | Return path for switch current; tied to GND in standard configurations - forms current-sense reference for Ipk detection. |
| 3 (Timing Capacitor) | Oscillator timing node | External capacitor (CT) sets oscillator frequency; discharge/charge currents define on/off time ratio. |
| 4 (GND) | Power and signal ground reference | Common return for internal circuits, current sense, and external components - requires low-impedance PCB connection. |
| 5 (Ipk Sense) | Current limit comparator input | Voltage drop across external sense resistor (Rsc) compared to 300 mV threshold - triggers cycle-by-cycle current limiting. |
| 6 (Driver Collector) | Collector of internal driver transistor | Used only when driving external NPN/PNP transistors for higher current - not connected in basic configurations. |
| 7 (Comparator Inverting Input) | Inverting input of error amplifier | Connected to voltage divider from output - compares feedback voltage against 1.25 V reference to regulate output. |
| 8 (VCC) | Positive supply input | Power source for internal circuitry; must be ≥3.0 V and ≤40 V; bypassed with 10 µF capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Darlington switch | Eliminates need for external switching transistor in sub-1 A applications, reducing BOM count and board space. |
| Adjustable output voltage | Set via external R1/R2 divider referenced to 1.25 V - supports buck (Vout < Vin), boost (Vout > Vin), and inverting (Vout < 0) topologies. |
| Internal 1.25 V ±2% reference | Enables stable regulation without external precision reference; line/load regulation tested at ±0.05% (boost) and ±0.12% (buck). |
| Current-mode control with cycle-by-cycle limiting | Provides inherent overload and short-circuit protection; Ipk sense pin allows programmable current limit via Rsc = 0.3 V / Ipk(max). |
| Wide 3–40 V input range | Supports direct connection to 5 V, 12 V, 24 V, and 36 V rails - suitable for industrial PLCs, battery packs, and automotive auxiliary systems. |
Applications
| Battery-Powered Instrumentation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Portable multimeter or handheld gas detector requiring regulated ±5 V or +12 V from single 9 V alkaline cell. IC Role / Device Role / Timing Role: MC34063ADR2G configured as inverting converter generates negative rail; boost configuration steps up 9 V to 12 V for op-amp biasing. Use Value: Achieves 62.2% efficiency at 100 mA load (Fig. 13); low 4 mA ICC extends battery life; no external switch needed reduces component count. |
Use Scenario: 4–20 mA loop-powered pressure transmitter needing isolated 5 V for microcontroller and analog front-end from 12–36 V loop supply. IC Role / Device Role / Timing Role: MC34063ADR2G used in buck configuration to step down loop voltage to stable 5 V; Ipk sense enables current-limited startup into capacitive loads. Use Value: Delivers 83.7% efficiency at 500 mA (Fig. 11); 1.25 V reference ensures <±0.12% line regulation across 15–25 V input range. |
| Embedded System Voltage Conversion | Automotive Auxiliary Power |
Use Scenario: Industrial gateway board with mixed 3.3 V, 5 V, and 12 V requirements powered from 24 V DC input. IC Role / Device Role / Timing Role: MC34063ADR2G deployed in multiple instances: buck for 5 V, boost for 12 V, and inverting for -5 V analog section. Use Value: Single-part flexibility reduces design complexity; SOIC-8 footprint simplifies layout; 1.5 A switch supports peak loads without derating. |
Use Scenario: Aftermarket infotainment module drawing 175 mA at 28 V from 12 V vehicle battery via boost converter. IC Role / Device Role / Timing Role: MC34063ADR2G configured as step-up converter (Fig. 9) with external diode and inductor to generate 28 V output. Use Value: Validated 87.7% efficiency at 175 mA; 40 V absolute max VCC rating accommodates load-dump transients up to 35 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-5.0 | Fixed 5 V output; no adjustable feedback; 0.5 A switch; 52 kHz fixed frequency. | Only suitable for fixed 5 V buck applications; cannot support boost/inverting or adjustable outputs. | Select when output voltage is fixed at 5 V and load ≤0.5 A - simpler design but zero topology flexibility. |
| TL494CN | Dual-error amplifier; 100–400 kHz adjustable frequency; push-pull output drivers; no integrated switch. | Requires external MOSFETs/BJTs; supports dual-output, synchronous rectification, and PWM modulation schemes. | Select for high-efficiency, high-current (>2 A), or multi-rail designs where external switch control and frequency tuning are required. |
Compared with LM2574N-5.0 and TL494CN, the MC34063ADR2G uniquely combines adjustable topology (buck/boost/inverting), integrated 1.5 A switch, and 1.25 V reference in a single SOIC-8 package - making it optimal for cost-sensitive, medium-power, multi-voltage embedded systems where design simplicity and part count reduction are critical.
Availability
MC34063ADR2G is available at Aetrix Electronics and suitable for industrial sensor power supplies, battery-powered instrumentation, and embedded system voltage conversion requiring stable component supply and long-term manufacturability.
Supply support for MC34063ADR2G 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, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The MC34063A series was designed as a low-cost, robust DC-DC controller for non-isolated buck, boost, and inverting converters in cost-sensitive industrial and consumer electronics - prioritizing integration, wide input range, and ease of use over ultra-high efficiency or high-frequency operation.
FAQ
What topologies does the MC34063ADR2G support?
The MC34063ADR2G supports three standard non-isolated DC-DC topologies: step-down (buck), step-up (boost), and voltage-inverting (inverting). Its internal Darlington switch, oscillator, and 1.25 V reference enable all three with minimal external components - as demonstrated in Figures 9 (boost), 11 (buck), and 13 (inverting) of the official datasheet. No additional ICs or complex control logic are required.
What is the maximum output current achievable with MC34063ADR2G?
The MC34063ADR2G has an internal switch rated for 1.5 A peak current. Continuous output current depends on topology, input/output voltages, thermal design, and efficiency. In the buck configuration shown in Figure 11, it delivers 500 mA at 83.7% efficiency with proper heatsinking. For higher currents, external transistor boosting (Fig. 10/12) is supported, but the base MC34063ADR2G itself is limited to ~1 A continuous under typical SOIC-8 thermal conditions.
How is output voltage adjusted on the MC34063ADR2G?
Output voltage is adjusted using a resistive divider (R1, R2) connected between output, feedback pin (Pin 7), and ground. The internal 1.25 V reference is compared to the divided voltage, so Vout = 1.25 V × (1 + R2/R1). This method works identically across buck, boost, and inverting configurations - as confirmed in Figure 17's design formulas and application schematics (Figs. 9, 11, 13) in the MC34063ADR2G datasheet.
Does MC34063ADR2G include thermal protection?
Yes, the MC34063ADR2G incorporates thermal shutdown protection. When junction temperature exceeds approximately +150°C (absolute maximum rating), the device disables switching to prevent damage. This is intrinsic to the silicon design and does not require external circuitry. Thermal performance is characterized with RJA = 160°C/W for the SOIC-8 package, meaning power dissipation must be managed via PCB copper area and airflow in sustained high-load operation.
Is MC34063ADR2G RoHS compliant and lead-free?
Yes, MC34063ADR2G is RoHS compliant and Pb-free, as indicated by the "G" suffix in its part number and explicitly stated in the datasheet's Features section and Ordering Information table. It meets halogen-free and BFR-free requirements per onsemi's environmental policy, and is supplied in tape-and-reel packaging (2500 units/reel) with Pb-free SOIC-8 construction.
MC34063ADR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063ADR2G FAQ
1.How can I place an order for MC34063ADR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ADR2G 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 MC34063ADR2G reliable?
The price and inventory of MC34063ADR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ADR2G is usually 5 days.
3.What payment methods are accepted for MC34063ADR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ADR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ADR2G?
MC34063ADR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ADR2G 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 MC34063ADR2G?
For technical support, including MC34063ADR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ADR2G requirements.
6.How does Aetrix verify that MC34063ADR2G is sourced from the original manufacturer or authorized distributors?
All MC34063ADR2G 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 MC34063ADR2G meets industry standards.
7.What is the process for return or replacement of MC34063ADR2G?
All MC34063ADR2G units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ADR2G, 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 MC34063ADR2G part is unused and in its original packaging.
Return procedure for MC34063ADR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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