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onsemi MC34063AP1
- Part No.:
- MC34063AP1
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC34063AP1.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,557
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Product details
Overview
MC34063AP1 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 (±2%), comparator, oscillator with timing capacitor control, current-limit circuit, driver, and 1.5 A Darlington output switch. Designed for low-component-count power conversion, it operates from 3.0 V to 40 V input and delivers stable output voltage adjustment in industrial power supplies and battery-powered systems.
For engineers reviewing the MC34063AP1 datasheet, pinout, applications, or equivalent options, key selection considerations include its 1.5 A switch current rating, 100 kHz max oscillator frequency, adjustable output voltage via external resistor divider, thermal performance in PDIP-8 package (RJA = 115 °C/W), and compatibility with standard flyback/boost/buck-inductor designs per AN920A/D.
Technical Context
The MC34063AP1 implements a fixed-frequency, current-mode controlled architecture using an internal oscillator whose timing is set by an external capacitor (CT) connected to Pin 3. Its peak-current limit is sensed at Pin 7 via a resistor (RSC), triggering shutdown when voltage exceeds 300 mV (typ). The internal Darlington output switch (Pins 1–2) enables high-current capability without external boost transistors in ≤1.5 A applications.
It features a precision 1.25 V reference (±2%) referenced to Pin 5 (comparator inverting input), enabling accurate output regulation across input and load variations. The device supports three fundamental configurations: step-up (boost), step-down (buck), and voltage-inverting - each requiring distinct external component placement but sharing identical internal control logic and timing behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V DC - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Switch Current | 1.5 A (continuous) - enables direct drive of medium-power converters without external MOSFETs. |
| Oscillator Frequency | Up to 100 kHz - sets practical upper limit for inductor size and EMI filtering requirements. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback threshold for precise output voltage setting via R1/R2 divider. |
| Current Limit Threshold | 300 mV (typ) at Pin 7 - defines overcurrent trip point; sets RSC = 0.2 Ω for 1.5 A limit. |
| Supply Current (Standby) | <4.0 mA - minimizes quiescent loss in battery-operated applications during light/no-load conditions. |
| Operating Temperature | 0°C to +70°C - specifies ambient range for MC34063A grade; suitable for commercial/industrial environments. |
Pinout & Package
MC34063AP1 is supplied 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. This through-hole package supports manual prototyping and legacy PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Switch Collector) | Collector of internal Darlington switch | Connects to inductor/diode node in boost/buck/inverting topologies; handles full switch current. |
| Pin 2 (Switch Emitter) | Emiter of internal Darlington switch | Return path for switch current; tied to ground in step-down, to input in step-up, or to output in inverting config. |
| Pin 3 (Timing Capacitor) | Oscillator timing node | External capacitor (CT) sets oscillator frequency; value directly determines switching period. |
| Pin 4 (GND) | Power and signal ground reference | Common return for internal circuits, current sense, and external components; requires low-impedance layout. |
| Pin 5 (Comparator Inverting Input) | Feedback reference input | Connected to resistor divider midpoint; regulates output by comparing against 1.25 V internal reference. |
| Pin 6 (Ipk Sense) | Current limit sense input | Voltage drop across RSC feeds here; triggers cycle-by-cycle current limiting when ≥300 mV. |
| Pin 7 (Driver Collector) | Driver stage collector output | Drives external NPN transistor in high-current boost configurations; not used in standard 1.5 A operation. |
| Pin 8 (VCC) | Positive supply input | Power input for internal circuitry; must be bypassed with ≥10 µF capacitor near the pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 3.0 V to 40 V enables single IC use across 5 V logic rails, 12 V automotive, and 24 V industrial inputs. |
| Integrated 1.5 A Darlington switch | Eliminates need for external power transistor in sub-1.5 A DC-DC designs, reducing BOM count and board space. |
| Adjustable output voltage | Set via two-resistor divider from output to Pin 5; supports any positive or negative output within device limits. |
| Precision 2% reference | 1.25 V bandgap reference ensures tight output regulation across temperature and line/load variations. |
| Current-mode control | Internal peak-current sensing provides inherent cycle-by-cycle protection and stable loop response. |
Applications
| Industrial Power Supplies | Automotive Aftermarket Electronics |
|---|---|
|
Use Scenario: Generating isolated 24 V rail from 12 V vehicle battery for sensor modules and CAN interface circuitry. IC Role / Device Role / Timing Role: Step-up (boost) regulator controlling inductor current and diode conduction timing to deliver regulated 24 V at up to 175 mA. Use Value: Enables compact, cost-effective 12 V-to-24 V conversion without transformer-based isolation, meeting automotive transient immunity requirements. |
Use Scenario: Providing stable 5.0 V supply for microcontroller and display in portable dashcam units powered by USB or car charger. IC Role / Device Role / Timing Role: Step-down (buck) regulator operating at ~33 kHz to convert 9–16 V input to tightly regulated 5.0 V output. Use Value: Delivers 500 mA output with 83.7% efficiency and <12 mV line regulation, ensuring reliable MCU operation under varying vehicle voltage conditions. |
| Portable Medical Devices | Battery-Powered Test Equipment |
|
Use Scenario: Generating -12 V bias supply from single 5 V Li-ion cell for op-amp signal conditioning in handheld ECG monitors. IC Role / Device Role / Timing Role: Voltage-inverting converter using coupled inductor topology to produce negative output with minimal external parts. Use Value: Achieves 100 mA at -12 V with 62.2% efficiency and low 500 mVpp ripple, supporting analog front-end precision without dual-supply batteries. |
Use Scenario: Powering digital logic and analog subsystems in handheld multimeters using alkaline AA cells (4.5–6.0 V). IC Role / Device Role / Timing Role: Step-down regulator maintaining constant 3.3 V output across battery discharge curve, with automatic duty-cycle adjustment. Use Value: Provides 100 mA at 3.3 V with ±0.09% load regulation and low 4.0 mA quiescent current, extending battery life beyond 100 hours. |
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 | SOIC-8 surface-mount package; same electrical specs and pinout as MC34063AP1. | Suitable for automated SMT production; requires reflow-compatible layout and lacks through-hole mounting flexibility. | Select MC34063ADR2G for volume PCB assembly; choose MC34063AP1 for prototyping, repair, or mixed-technology boards. |
| LM2574N-5.0 | Fixed 5.0 V output; higher efficiency (up to 88%); integrated 52 kHz oscillator; no external timing capacitor needed. | Limited to fixed-output applications; cannot generate adjustable or negative voltages without additional circuitry. | Choose LM2574N-5.0 only when 5.0 V output suffices and board space is constrained; retain MC34063AP1 for design flexibility and multi-topology support. |
Compared with MC34063ADR2G, MC34063AP1 offers identical functionality in a through-hole package ideal for development and low-volume builds, while LM2574N-5.0 trades configurability for simplicity and efficiency in fixed-voltage use cases - making MC34063AP1 the preferred choice where adjustable output, polarity inversion, or manual assembly is required.
Availability
MC34063AP1 is available at Aetrix Electronics and suitable for industrial power supplies, automotive aftermarket electronics, portable medical devices, and battery-powered test equipment requiring stable component supply and long-term manufacturability.
Supply support for MC34063AP1 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, and cloud infrastructure markets.
The MC34063A series was designed as a general-purpose, low-cost switching regulator controller for cost-sensitive, medium-power DC-DC conversion in commercial and industrial applications - emphasizing minimal external component count and broad topology support.
FAQ
What is the maximum output current supported by the MC34063AP1 without external components?
The MC34063AP1 integrates a Darlington output switch rated for 1.5 A continuous collector current. This allows direct implementation of step-up, step-down, or inverting converters delivering up to approximately 175 mA at 28 V (boost), 500 mA at 5 V (buck), or 100 mA at −12 V (inverting), depending on topology, efficiency, and thermal management. Exceeding these values requires external transistor boosting per Figure 10–14 in the datasheet.
Can the MC34063AP1 generate negative output voltages?
Yes, the MC34063AP1 supports voltage-inverting configuration, as demonstrated in Figure 13 of the datasheet. With proper external component selection - including inductor (88 µH), timing capacitor (1500 pF), and feedback resistors (R1 = 953 Ω, R2 = 8.2 kΩ) - it delivers regulated −12 V at 100 mA from a 4.5–6.0 V input. The internal oscillator and current-sense architecture function identically in this mode.
What is the purpose of Pin 7 (Driver Collector) on the MC34063AP1?
Pin 7 provides the collector output of the internal driver transistor, intended for driving an external NPN transistor to extend peak switch current beyond the internal 1.5 A limit. In standard operation (≤1.5 A), Pin 7 remains unconnected. When used, it enables configurations shown in Figures 10–14, where the external transistor handles main power switching while the MC34063AP1 retains control and protection functions.
How does the MC34063AP1 achieve output voltage regulation?
The MC34063AP1 regulates output voltage using a precision 1.25 V internal reference and comparator. Feedback from the output is applied to Pin 5 (comparator inverting input) via a resistor divider. When the divided voltage drops below 1.25 V, the comparator extends the switch ON time; when it rises above, the comparator shortens ON time. This closed-loop control maintains stable output despite input or load changes.
Is the MC34063AP1 RoHS compliant and lead-free?
Yes, the MC34063AP1G variant (as indicated in the ordering information on page 12 of the datasheet) is Pb-free, halogen-free/BFR-free, and RoHS compliant. The "G" suffix in the part number explicitly denotes compliance with EU RoHS Directive 2011/65/EU and related environmental standards.
MC34063AP1 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:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MC34063AP1 FAQ
1.How can I place an order for MC34063AP1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063AP1 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 MC34063AP1 reliable?
The price and inventory of MC34063AP1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063AP1 is usually 5 days.
3.What payment methods are accepted for MC34063AP1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063AP1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063AP1?
MC34063AP1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063AP1 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 MC34063AP1?
For technical support, including MC34063AP1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063AP1 requirements.
6.How does Aetrix verify that MC34063AP1 is sourced from the original manufacturer or authorized distributors?
All MC34063AP1 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 MC34063AP1 meets industry standards.
7.What is the process for return or replacement of MC34063AP1?
All MC34063AP1 units undergo pre-shipment inspection (PSI). If there is an issue with MC34063AP1, 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 MC34063AP1 part is unused and in its original packaging.
Return procedure for MC34063AP1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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