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onsemi MC34063ADR2
- Part No.:
- MC34063ADR2
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063ADR2.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,595
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Product details
Overview
MC34063ADR2 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 minimal external components, it operates from 3.0 V to 40 V input and delivers adjustable output voltage in industrial power supplies and battery-powered systems.
For engineers reviewing the MC34063ADR2 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.5 A switch current capability, 100 kHz max switching frequency, SOIC-8 package thermal resistance (RJA = 160 °C/W), and precision 2% reference tolerance - all critical for stable, compact converter designs.
Technical Context
The MC34063ADR2 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. Its Darlington output stage enables 1.5 A peak switch current with VCE(sat) ≤ 1.3 V at 1.0 A, while the 1.25 V reference feeds a high-impedance comparator for precise output regulation.
Current limiting is achieved via sensing voltage across an external resistor (Rsc) connected to Pin 7, with a nominal trip threshold of 300 mV. The device supports three fundamental converter configurations - boost, buck, and inverting - each requiring distinct external component arrangements but sharing identical internal timing and regulation logic.
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 - enables up to ~1.2 A continuous output in typical boost/buck designs with margin. |
| Reference Voltage | 1.25 V ±2% - sets output voltage accuracy via external resistor divider (e.g., R1/R2 in Fig. 9–13). |
| Max Switching Frequency | 100 kHz - balances efficiency, inductor size, and EMI in cost-sensitive discrete-switcher designs. |
| Oscillator Timing | CT pin controls frequency via external capacitor; typical fosc = 33 kHz with 1 nF (Fig. 3). |
| Current Limit Threshold | 300 mV ±50 mV - defines peak switch current as Ipk = 0.3 V / Rsc, enabling precise overcurrent protection. |
| Thermal Resistance (SOIC-8) | RJA = 160 °C/W - requires heatsinking or derating above ~350 mW dissipation at ambient. |
Pinout & Package
MC34063ADR2 is housed in an 8-pin SOIC-8 (Case 751) package with exposed pad not present; maximum power dissipation is 625 mW at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Switch Collector | Output switch collector node | Connects to inductor/diode in boost, to input in buck, or to ground in inverting; handles full switch current. |
| 2 - Switch Emitter | Output switch emitter node | Return path for switch current; tied to GND in standard configurations; used with external Rsc for current sensing. |
| 3 - Timing Capacitor | Oscillator timing node | External CT capacitor sets oscillator frequency; discharge/charge currents define on/off time ratio. |
| 4 - GND | Power and signal reference | Common return for internal circuits, current sense, and external components; must be low-impedance. |
| 5 - Comparator Inverting Input | Feedback input | Receives divided output voltage; compared against 1.25 V reference to regulate output. |
| 6 - Ipk Sense | Current limit input | Voltage across Rsc (between Pins 6 and 2) triggers current limit when ≥300 mV. |
| 7 - Driver Collector | Internal driver output | Drives external NPN transistor for current boosting beyond 1.5 A (Fig. 10/12/14). |
| 8 - VCC | Power supply input | Accepts 3.0–40 V input; powers internal circuitry; bypass capacitor required for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Darlington switch | Eliminates need for external power transistor in sub-1 A applications, reducing BOM count and layout area. |
| Adjustable output voltage | Set via two-resistor feedback divider referenced to 1.25 V, enabling any output from ~1.25 V to >40 V depending on topology. |
| Low standby current | Typical ICC ≤ 4.0 mA - extends battery life in always-on or low-power modes. |
| Temperature-compensated reference | 1.25 V ±2% over 0°C to +70°C - ensures stable regulation across operating temperature range. |
| Pb-free, RoHS-compliant packaging | SOIC-8 D suffix meets environmental compliance requirements for industrial and consumer manufacturing. |
Applications
| LED Backlight Power Supply | Industrial Sensor Node Power |
|---|---|
Use Scenario: Driving white LED strings from 5 V USB or 12 V rail in portable displays. IC Role / Device Role / Timing Role: Step-up controller generating 18–24 V at 150 mA with fixed 33 kHz switching (CT = 1 nF). Use Value: Achieves 87.7% efficiency (Fig. 9) and <40 mVpp ripple with optional LC filter, meeting display brightness stability requirements. | Use Scenario: Providing regulated 3.3 V or 5 V from variable 6–24 V industrial bus for microcontrollers and analog sensors. IC Role / Device Role / Timing Role: Step-down regulator with 1.2 kΩ/3.6 kΩ feedback divider, operating at 100 kHz for compact inductor sizing. Use Value: Delivers 500 mA output with ±0.12% line regulation and 83.7% efficiency (Fig. 11), ensuring sensor accuracy under load transients. |
| USB-C Powered Peripherals | Negative Rail Generator |
Use Scenario: Generating isolated -5 V or -12 V from single 5 V USB-C source for op-amp biasing or RS-232 interfaces. IC Role / Device Role / Timing Role: Inverting converter with 953 Ω/8.2 kΩ divider, CT = 1500 pF for ~30 kHz operation (Fig. 13). Use Value: Provides 100 mA at -12 V with 62.2% efficiency and <70 mVpp ripple, enabling dual-supply analog circuits from single-rail sources. | Use Scenario: Creating negative auxiliary supply for audio amplifiers or data acquisition front-ends in battery-powered test equipment. IC Role / Device Role / Timing Role: Voltage-inverting regulator with 88 µH inductor and 1N5819 Schottky diode, optimized for low-noise operation. Use Value: Maintains ±0.012% line regulation over 4.5–6.0 V input, critical for precision ADC reference stability. |
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 |
|---|---|---|---|
| MC34063AD | Same SOIC-8 package and electrical specs; differs only in tape-and-reel vs. rail packaging (ADR2G = 2500/reel, ADG = 98/rail). | No functional difference; suitable for same boost/buck/inverting circuits. | Select MC34063AD for small-batch prototyping where rail packaging is preferred. |
| LM2574N-5.0 | Fixed 5 V output, 0.5 A switch current, 52 kHz frequency; no adjustable feedback or current-sense pin. | Limited to fixed-output step-down only; cannot replace MC34063ADR2 in boost or inverting roles. | Choose LM2574N-5.0 only for simple 5 V buck conversion where adjustability and topology flexibility are unnecessary. |
Compared with MC34063AD, the MC34063ADR2 offers identical performance in tape-and-reel format for automated assembly; versus LM2574N-5.0, it provides full topology flexibility and higher current, but requires more external components and design effort.
Availability
MC34063ADR2 is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, LED lighting drivers, and embedded DC-DC conversion requiring stable component supply and long-term manufacturability.
Supply support for MC34063ADR2 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 MC34063A series was designed as a cost-optimized, discrete-friendly switching regulator IC targeting non-critical industrial and consumer power conversion where programmability and ultra-high efficiency are secondary to simplicity and BOM reduction.
FAQ
What is the maximum output current achievable with MC34063ADR2 in a step-up configuration?
The MC34063ADR2 internal switch supports 1.5 A peak current. In a practical step-up design (e.g., Fig. 9), continuous output current is limited by thermal dissipation and duty cycle. With proper heatsinking and 170 µH inductor, MC34063ADR2 reliably delivers 175 mA at 28 V from 12 V input at 87.7% efficiency. Higher outputs require external switch boosting per Fig. 10.
Can MC34063ADR2 be used in automotive applications?
The standard MC34063ADR2 is rated for 0°C to +70°C ambient and is not AEC-Q100 qualified. For automotive use, select the NCV33063AVDR2G variant, which is specified for −40°C to +125°C and PPAP-capable. MC34063ADR2 itself is intended for commercial/industrial environments only.
How does the current limit function in MC34063ADR2, and how is Rsc calculated?
The MC34063ADR2 limits peak switch current by monitoring voltage across Rsc (Pins 6–2). When this voltage reaches ~300 mV, the switch turns off. To set Ipk = 1.2 A, use Rsc = 0.3 V / 1.2 A = 0.25 Ω. This value is confirmed in Fig. 9 (Rsc = 0.22 Ω for 1.36 A peak) and Fig. 11 (Rsc = 0.33 Ω for 0.91 A peak).
What is the minimum recommended input voltage for stable operation of MC34063ADR2?
MC34063ADR2 operates down to 3.0 V input, but stable regulation requires sufficient headroom between input and output. In step-down mode, VIN(min) must exceed VOUT + VCE(sat) + VF(diode). For a 5 V output, 3.0 V input is insufficient; 6–7 V is typical minimum. The 3.0 V rating reflects startup capability, not sustained regulation.
Does MC34063ADR2 support synchronous rectification?
No, MC34063ADR2 does not support synchronous rectification. It drives an external diode (e.g., 1N5819 Schottky) in all topologies. The internal switch is a Darlington NPN pair, and no gate-drive outputs or timing signals are provided for external MOSFET control. Efficiency gains from sync rectification require alternative controllers like the LM2733 or TPS61040.
MC34063ADR2 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063ADR2 FAQ
1.How can I place an order for MC34063ADR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ADR2 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 MC34063ADR2 reliable?
The price and inventory of MC34063ADR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ADR2 is usually 5 days.
3.What payment methods are accepted for MC34063ADR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ADR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ADR2?
MC34063ADR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ADR2 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 MC34063ADR2?
For technical support, including MC34063ADR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ADR2 requirements.
6.How does Aetrix verify that MC34063ADR2 is sourced from the original manufacturer or authorized distributors?
All MC34063ADR2 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 MC34063ADR2 meets industry standards.
7.What is the process for return or replacement of MC34063ADR2?
All MC34063ADR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ADR2, 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 MC34063ADR2 part is unused and in its original packaging.
Return procedure for MC34063ADR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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