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onsemi SC34063AP1G
- Part No.:
- SC34063AP1G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
SC34063AP1G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,014
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Product details
Overview
SC34063AP1G 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 limit, 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 supply applications.
For engineers reviewing the SC34063AP1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.5 A switch current capability, 2% reference precision, 100 kHz max switching frequency, PDIP-8 package thermal performance (1.25 W at 25°C), and compatibility with standard buck/boost/invert designs per AN920A/D.
Technical Context
The SC34063AP1G 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 provides 1.0–1.3 V saturation voltage at 1.0 A, enabling efficient high-current switching without external boost transistors in most designs.
It features a precision 1.25 V ±2% bandgap reference referenced to the inverting comparator input (Pin 5), enabling stable feedback across input voltage and temperature ranges. The current-limit sense threshold is 250–350 mV at Pin 7, directly controlling peak switch current via an external sense resistor (Rsc).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Output Switch Current | 1.5 A - enables direct drive of medium-power converters without external MOSFETs in typical 5–24 V input applications. |
| Reference Voltage | 1.25 V ±2% - ensures accurate output voltage regulation with standard resistor-divider feedback networks. |
| Max Switching Frequency | 100 kHz - balances efficiency, EMI, and inductor size for cost-sensitive discrete power supplies. |
| Current Limit Threshold | 250–350 mV at Pin 7 - sets precise overcurrent protection via Rsc = 0.3 / Ipk, enabling predictable fault current limiting. |
| Supply Current (Standby) | <4.0 mA - minimizes quiescent loss in low-power or battery-backed systems during light-load operation. |
| Operating Ambient Range | 0°C to +70°C - qualified for commercial and industrial ambient environments, not extended automotive grade. |
Pinout & Package
SC34063AP1G is housed in an 8-pin PDIP (Plastic Dual In-line Package), Case 626-05, with 0.300-inch body width and 0.100-inch lead pitch. Thermal resistance is RJA = 115°C/W and maximum power dissipation is 1.25 W at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Switch Collector | High-side collector of internal Darlington switch; connects to inductor in boost, to input in buck, or to ground in inverting configurations. |
| 2 | Switch Emitter | Emitting node of internal Darlington; serves as return path for switch current and connects to ground or input depending on topology. |
| 3 | Timing Capacitor | Connects external CT capacitor to set oscillator frequency; discharge/charge currents determine fosc ≈ 1/(2.4 × CT × Rsc). |
| 4 | GND | Power and signal ground reference for all internal circuits and external feedback network. |
| 5 | Comparator Inverting Input | Feedback node for output voltage regulation; referenced to internal 1.25 V reference; forms error amplifier input with R1/R2 divider. |
| 6 | Ipk Sense | Current limit detection input; monitors voltage drop across external Rsc to terminate switch conduction when threshold is exceeded. |
| 7 | Driver Collector | Open-collector output driving external NPN transistor in high-current boost configurations; not used in standard Darlington mode. |
| 8 | VCC | Main power supply input; powers internal circuitry and must be bypassed with ≥100 nF capacitor near the pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Darlington Switch | Eliminates need for external high-current transistors in ≤1.5 A applications, reducing BOM count and layout complexity. |
| Adjustable Output Voltage | Enabled by 1.25 V reference and external resistor divider; supports outputs from ~1.25 V up to >40 V depending on topology and component ratings. |
| Temperature-Compensated Reference | Maintains ±2% accuracy over 0°C to +70°C ambient, ensuring stable regulation without external trimming. |
| Active Current Limit Circuit | Provides cycle-by-cycle peak current limiting via Rsc, protecting both IC and external magnetics during overload or short-circuit events. |
| Pb-Free, RoHS-Compliant Packaging | PDIP-8 (P1 suffix) meets environmental compliance requirements for industrial manufacturing and end-of-life handling. |
Applications
| LED Driver for Industrial Lighting | USB-C Power Adapter Auxiliary Supply |
|---|---|
Use Scenario: Driving 12 V, 350 mA white LED strings from a 5 V rail in factory floor lighting fixtures. IC Role / Device Role / Timing Role: Step-up DC-DC controller regulating constant current via feedback sensing; oscillator sets 50 kHz switching frequency to minimize audible noise and EMI. Use Value: Achieves 87.7% efficiency at full load (Fig. 9), with line/load regulation better than ±0.05%, enabling reliable long-life operation without heatsinking. | Use Scenario: Generating isolated 3.3 V/500 mA auxiliary bias supply from 20 V USB-C PD bus in multi-rail AC-DC adapters. IC Role / Device Role / Timing Role: Step-down regulator with external diode and inductor; uses internal 1.25 V reference for tight output tolerance and low dropout under transient loads. Use Value: Delivers ±0.12% line regulation and 40 mVpp ripple with optional LC filter (Fig. 11), meeting USB-C spec requirements for clean auxiliary rail generation. |
| Portable Medical Device Battery Booster | Inverting Rail Generator for Op-Amp Circuits |
Use Scenario: Boosting single-cell Li-ion (3.0–4.2 V) to 5.0 V for microcontroller and sensor subsystems in handheld diagnostics tools. IC Role / Device Role / Timing Role: Step-up controller with low-startup-voltage capability; Darlington switch enables operation down to 3.0 V input while maintaining regulation. Use Value: Maintains regulated 5.0 V output across full battery discharge curve with <4.0 mA quiescent current, extending runtime between charges. | Use Scenario: Generating −12 V/100 mA dual-rail supply from 5 V for precision instrumentation op-amps in test equipment. IC Role / Device Role / Timing Role: Voltage-inverting regulator using standard external components; feedback referenced to GND enables stable negative output regulation. Use Value: Provides ±0.012% line regulation and 70 mVpp ripple (Fig. 13), supporting low-noise analog signal conditioning without dedicated negative charge pumps. |
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 |
|---|---|---|---|
| MC34063AP1G | Same die, ON Semiconductor branded; identical electrical specs and pinout; same 0°C to +70°C rating. | No functional difference; suitable for same industrial/commercial applications. | Select when sourcing from ON Semiconductor's standard product line with identical traceability and documentation. |
| SC34063ADR2G | SOIC-8 package (D suffix); lower thermal resistance (RJA = 160°C/W vs. 115°C/W), but reduced power dissipation (625 mW vs. 1.25 W). | Better suited for space-constrained PCBs where thermal management allows lower power density; not drop-in for high-power PDIP layouts. | Choose for surface-mount assembly and moderate-power designs where board area is critical and peak load is ≤0.6 A. |
Compared with MC34063AP1G, SC34063AP1G offers identical performance with enhanced environmental compliance (Pb-free, halogen-free). Versus SC34063ADR2G, the P1G variant provides higher power handling in through-hole form factor-critical for prototyping, high-reliability industrial builds, and legacy through-hole production lines.
Availability
SC34063AP1G is available at Aetrix Electronics and suitable for industrial power supplies, portable medical devices, LED lighting drivers, and USB-C auxiliary rails requiring stable component supply and long-term manufacturability.
Supply support for SC34063AP1G 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, cloud, and consumer markets.
The SC34063A series was designed as a cost-optimized, general-purpose switching regulator IC family targeting discrete DC-DC converter designs where simplicity, reliability, and wide input range outweigh the need for integrated MOSFETs or digital control.
FAQ
What is the maximum output current achievable with SC34063AP1G in a step-up configuration?
The SC34063AP1G supports up to 1.5 A peak switch current. In a step-up configuration, practical continuous output current depends on input voltage, output voltage, efficiency, and thermal design. For example, with 12 V input to 28 V output at 87.7% efficiency (Fig. 9), SC34063AP1G delivers 175 mA continuously. Higher output currents require external current boosting per Figure 10, but the IC itself remains limited to 1.5 A peak internal switch current.
Can SC34063AP1G operate from a 3.0 V input supply?
Yes, SC34063AP1G is specified to operate from 3.0 V to 40 V input. Its internal circuitry-including the reference, comparator, and oscillator-functions reliably at 3.0 V, enabling use with single-cell Li-ion or alkaline batteries. However, output voltage headroom must be considered: in step-up mode, minimum input must exceed output minus diode drop and switch saturation losses.
What is the purpose of Pin 7 (Driver Collector) on SC34063AP1G?
Pin 7 is the driver collector output, intended for external NPN transistor connection in high-current (>1.5 A) boost configurations (Fig. 10). In standard Darlington mode (default), Pin 7 is left unconnected or tied to VCC. It is not used for normal operation but enables current boosting when the internal switch reaches its 1.5 A limit, allowing SC34063AP1G to control larger external transistors.
How does the current limit function in SC34063AP1G?
The SC34063AP1G implements cycle-by-cycle current limiting by monitoring voltage across an external sense resistor (Rsc) connected between Pin 2 (Switch Emitter) and GND. When the voltage exceeds 250–350 mV (typ. 300 mV), the internal comparator terminates the switch-on time. This protects the IC and external components during overload or short-circuit conditions without requiring additional circuitry.
Is SC34063AP1G suitable for automotive applications?
No, SC34063AP1G is rated for 0°C to +70°C ambient operation and is not AEC-Q100 qualified. For automotive use, the NCV33063A or MC33063AV variants are specified for −40°C to +125°C and support PPAP documentation. SC34063AP1G is intended for commercial and industrial applications only.
SC34063AP1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
SC34063AP1G FAQ
1.How can I place an order for SC34063AP1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SC34063AP1G 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 SC34063AP1G reliable?
The price and inventory of SC34063AP1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC34063AP1G is usually 5 days.
3.What payment methods are accepted for SC34063AP1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC34063AP1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC34063AP1G?
SC34063AP1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC34063AP1G 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 SC34063AP1G?
For technical support, including SC34063AP1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC34063AP1G requirements.
6.How does Aetrix verify that SC34063AP1G is sourced from the original manufacturer or authorized distributors?
All SC34063AP1G 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 SC34063AP1G meets industry standards.
7.What is the process for return or replacement of SC34063AP1G?
All SC34063AP1G units undergo pre-shipment inspection (PSI). If there is an issue with SC34063AP1G, 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 SC34063AP1G part is unused and in its original packaging.
Return procedure for SC34063AP1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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