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onsemi SC34063ADR2G
- Part No.:
- SC34063ADR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SC34063ADR2G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,949
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Product details
Overview
SC34063ADR2G 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 conversion applications.
For engineers reviewing the SC34063ADR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its 1.5 A switch current capability, 100 kHz max oscillator frequency, SOIC-8 package, 2% reference accuracy, and thermal performance in ambient temperatures up to +70°C.
Technical Context
The SC34063ADR2G implements a fixed-frequency, current-mode control architecture with an internal Darlington output transistor and precision 1.25 V reference. Its oscillator uses an external timing capacitor (CT) to set frequency between 24–42 kHz at typical conditions, with discharge-to-charge current ratio of 5.2–7.5.
Current limiting is achieved via IPk sense voltage (250–350 mV), and the device supports both internal switching and external transistor boosting configurations. The comparator's inverting input accepts feedback from resistor dividers to regulate output voltage across all three topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery-derived supplies. |
| Output Switch Current | 1.5 A - enables direct drive of medium-power converters without external boost transistors. |
| Oscillator Frequency | Up to 100 kHz - allows compact magnetics and filtering while maintaining efficiency above audible range. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback threshold for precise output regulation across temperature. |
| Current Limit Threshold | 300 mV typical - sets peak switch current via external sense resistor (Rsc = 0.3 / IPk). |
| Supply Current (Standby) | <4.0 mA - minimizes quiescent loss in low-power or battery-backed systems. |
| Operating Ambient Range | 0°C to +70°C - rated for commercial/industrial environments, not extended automotive. |
Pinout & Package
SC34063ADR2G is housed in an 8-pin SOIC-8 (Case 751) package with standard surface-mount footprint and 1.27 mm pitch. Thermal resistance is RJA = 160°C/W, and maximum power dissipation at TA = 25°C is 625 mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Switch Collector | Output switch collector node | Connects to inductor/diode in step-up or step-down; high-voltage switching node requiring layout care. |
| 2 - Switch Emitter | Output switch emitter node | Return path for switch current; tied to GND in standard configurations or used as current-sense reference. |
| 3 - Timing Capacitor | Oscillator timing node | External CT capacitor sets oscillator frequency; value directly determines on/off time ratio. |
| 4 - GND | Analog and power ground | Common reference for comparator, reference, and oscillator; must be low-impedance and star-connected. |
| 5 - Comparator Inverting Input | Feedback input | Accepts resistor-divider voltage from output; compares to 1.25 V reference to regulate output. |
| 6 - IPk Sense | Current limit detection | Senses voltage across external Rsc; triggers shutdown when ≥300 mV to protect switch. |
| 7 - Driver Collector | Internal driver output | Drives external NPN/PNP transistors in boosted configurations; open-collector output. |
| 8 - VCC | Power supply input | Supplies internal circuitry; bypass capacitor required; also powers external driver if used. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Enabled by resistor divider on Pin 5 - supports any output ≥1.25 V with proper topology design. |
| Darlington output stage | Integrated 1.5 A switch eliminates need for external transistor in ≤1.5 A applications - reduces BOM count and layout area. |
| Low standby current | <4 mA supply current - extends battery life in portable or always-on auxiliary supplies. |
| Internal 2% precision reference | 1.25 V ±2% over temperature - ensures stable regulation without trimming or calibration. |
| Current-limited operation | Fixed 300 mV IPk sense threshold - provides robust short-circuit and overload protection without additional circuitry. |
Applications
| LED Backlight Power Supply | Industrial Sensor Bias Supply |
|---|---|
|
Use Scenario: Generating 28 V @ 175 mA from 12 V input for LCD panel backlighting in factory HMIs. IC Role / Device Role / Timing Role: Step-up DC-DC controller regulating output via feedback divider on Pin 5; oscillator sets 33 kHz switching frequency. Use Value: Achieves 87.7% efficiency and ±0.05% line regulation using only 6 external components - simplifies design and improves reliability. |
Use Scenario: Providing isolated −12 V @ 100 mA bias for analog sensor front-ends in PLC I/O modules. IC Role / Device Role / Timing Role: Voltage-inverting regulator with 88 µH inductor and 1500 pF timing capacitor; regulates via 953 Ω / 8.2 kΩ divider. Use Value: Delivers ±0.012% line regulation and 62.2% efficiency from 4.5–6.0 V input - meets tight analog supply stability requirements. |
| USB-C PD Auxiliary Rail | Legacy 5 V to 3.3 V Point-of-Load |
|
Use Scenario: Deriving 5.0 V @ 500 mA from 25 V intermediate bus in USB-C PD adapter secondary side. IC Role / Device Role / Timing Role: Step-down controller with 220 µH inductor and 470 pF CT; feedback divider sets 5.0 V output. Use Value: Achieves 83.7% efficiency and ±0.12% line regulation - satisfies USB-C PD auxiliary rail efficiency and ripple specs. |
Use Scenario: Converting 5 V system rail to 3.3 V for microcontroller I/O in industrial gateways. IC Role / Device Role / Timing Role: Step-down regulator with Darlington switch operating at 100 kHz; Rsc = 0.33 Ω sets 1.5 A current limit. Use Value: Supports 500 mA load with 40 mVpp ripple (with optional filter) - meets MCU noise immunity requirements. |
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 | Same die, identical electrical specs; differs only in manufacturer branding and traceability. | No functional difference; qualified for same commercial temperature range (0°C to +70°C). | Select when sourcing from onsemi's standard product line with full lifecycle support. |
| LM2574N-5.0 | Fixed 5 V output, 0.5 A switch, 52 kHz fixed frequency; no adjustable output or IPk sense pin. | Limited to fixed-output step-down only; unsuitable for step-up/inverting or adjustable designs. | Choose only for simple 5 V step-down where adjustability and topology flexibility are unnecessary. |
Compared with MC34063ADR2G, SC34063ADR2G offers identical performance but may differ in lot traceability and regional distribution channels; versus LM2574N-5.0, SC34063ADR2G provides full topology flexibility and 3× higher output current, enabling broader system-level integration.
Availability
SC34063ADR2G is available at Aetrix Electronics and suitable for industrial power conversion, embedded sensor biasing, and legacy voltage translation requiring stable component supply and long-term manufacturability.
Supply support for SC34063ADR2G 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The SC34063ADR2G belongs to the legacy MC34063A family - designed for cost-sensitive, discrete-component-based DC-DC conversion where flexibility, simplicity, and wide input range outweigh integrated FET or digital control requirements.
FAQ
What topologies does the SC34063ADR2G support?
The SC34063ADR2G supports step-up (boost), step-down (buck), and voltage-inverting (buck-boost) configurations. Its internal Darlington switch, oscillator, and current-sense architecture enable all three with minimal external components - confirmed in Figures 9–13 of the official datasheet. Each topology requires specific inductor, diode, and feedback resistor arrangements, but the SC34063ADR2G itself remains unchanged across implementations.
What is the maximum output current achievable with SC34063ADR2G?
The SC34063ADR2G features an internal Darlington output switch rated for 1.5 A peak current. This is the absolute maximum switch current under pulsed conditions; continuous output current depends on thermal design, input/output voltage differential, and duty cycle. At 25°C ambient with SOIC-8 package, sustained output is typically limited to ~500–700 mA before thermal derating applies - verified by power dissipation limits (625 mW) and RJA = 160°C/W.
Can SC34063ADR2G operate from a 3.3 V input?
Yes, the SC34063ADR2G specifies a minimum input voltage of 3.0 V, making 3.3 V operation fully supported. However, step-up operation from 3.3 V requires careful attention to minimum duty cycle and inductor saturation current, as the internal switch VCE(sat) (~1.0 V in Darlington mode) reduces effective headroom. Verified test data shows stable regulation down to 3.0 V across all topologies per Electrical Characteristics table.
How is output voltage adjusted on SC34063ADR2G?
Output voltage is adjusted using a resistor divider connected between output and Pin 5 (Comparator Inverting Input), with the divider's center tap grounded. The SC34063ADR2G regulates so that Pin 5 equals its internal 1.25 V reference; thus VOUT = 1.25 V × (1 + R1/R2). This method works identically across step-up, step-down, and inverting configurations - confirmed in Figures 9–13 and Equation |VOUT| = 1.25 × (1 + R2/R1) in Figure 17.
Does SC34063ADR2G require an external timing resistor?
No, the SC34063ADR2G uses only an external timing capacitor (CT) on Pin 3 - no timing resistor is needed. Oscillator frequency is determined solely by CT value and internal charge/discharge currents (24–42 µA typical), as shown in Figure 3 and the Electrical Characteristics table. Adding a resistor would disrupt the internal oscillator's constant-current charging mechanism and is not supported by the SC34063ADR2G architecture.
SC34063ADR2G 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:
- 33kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SC34063ADR2G FAQ
1.How can I place an order for SC34063ADR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for SC34063ADR2G 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 SC34063ADR2G reliable?
The price and inventory of SC34063ADR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC34063ADR2G is usually 5 days.
3.What payment methods are accepted for SC34063ADR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC34063ADR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC34063ADR2G?
SC34063ADR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC34063ADR2G 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 SC34063ADR2G?
For technical support, including SC34063ADR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC34063ADR2G requirements.
6.How does Aetrix verify that SC34063ADR2G is sourced from the original manufacturer or authorized distributors?
All SC34063ADR2G 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 SC34063ADR2G meets industry standards.
7.What is the process for return or replacement of SC34063ADR2G?
All SC34063ADR2G units undergo pre-shipment inspection (PSI). If there is an issue with SC34063ADR2G, 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 SC34063ADR2G part is unused and in its original packaging.
Return procedure for SC34063ADR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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