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STMicroelectronics MC34063EBD
- Part No.:
- MC34063EBD
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063EBD.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,409
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Product details
Overview
MC34063EBD from STMicroelectronics is a monolithic DC-DC converter control circuit in SO-8 package, featuring 1.5 A output switch current, 2% reference accuracy, and operation from 3 V to 40 V input. It supports step-up, step-down, and voltage-inverting topologies with active current limiting and oscillator frequency up to 100 kHz-used in industrial power supplies and battery-powered instrumentation.
For engineers reviewing the MC34063EBD datasheet, MC34063EBD pinout, MC34063EBD application, or MC34063EBD equivalent, key selection criteria include its -40 °C to +125 °C operating junction temperature, Darlington-compatible saturation voltage (1.3 V typ.), and adjustable output via two external resistors.
Technical Context
The MC34063EBD integrates a temperature-compensated 1.25 V reference, comparator, duty-cycle-controlled oscillator, active current-limit circuit, driver stage, and high-current Darlington output switch. Its oscillator timing is set by an external capacitor (CT), with charge/discharge currents of 33 µA/200 µA (typ.) enabling precise frequency control from ~24 kHz to 100 kHz.
Current limiting is implemented via IPK sense pin (VIPK = 300 mV typ.), triggering shutdown when sensed voltage across RSC exceeds threshold. The device supports both internal switching (up to 1.5 A) and external transistor configurations for higher power, with dedicated SWC/SWE and DRC pins for flexible topology implementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output switch current | 1.5 A max - enables direct drive of medium-power converters without external transistors |
| Reference voltage accuracy | ±2% - ensures stable output regulation across temperature and line variations |
| Supply voltage range | 3 V to 40 V - supports wide-input industrial and automotive battery systems |
| Oscillator frequency | 24–42 kHz (typ.) - sets practical switching frequency for low EMI and efficient magnetics design |
| Quiescent current | 2.5 mA (typ.) - minimizes no-load power loss in always-on or battery-backed systems |
| Operating temperature | -40 °C to +125 °C - qualified for under-hood and industrial ambient environments |
| VCE(sat) (Darlington) | 1.3 V (typ., ISW = 1 A) - defines conduction loss and thermal budget in step-down/step-up stages |
Pinout & Package
MC34063EBD is housed in a surface-mount SO-8 package (4.8 mm × 3.9 mm, 1.27 mm pitch), compliant with ECOPACK environmental standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SWC | Switch collector | High-side collector node of internal Darlington switch; connects to inductor in step-up or transformer primary in flyback |
| 2 SWE | Switch emitter | Emitting node of internal switch; tied to ground in step-down, or forms return path in inverting topologies |
| 3 TC | Timing capacitor | Connects external CT to set oscillator frequency; determines on/off time ratio and switching period |
| 4 GND | Ground reference | Primary analog and power ground for comparator, reference, and oscillator circuits |
| 5 CII | Comparator inverting input | Feedback node for output voltage regulation; compares against 1.25 V internal reference |
| 6 VCC | Power supply input | Input voltage rail powering internal circuitry; must be ≥1.5 V for startup and ≤50 V absolute max |
| 7 IPK | Current limit sense | Senses voltage across external RSC resistor; triggers cycle-by-cycle current limiting at 300 mV threshold |
| 8 DRC | Driver collector | Open-collector driver output for external NPN/PNP transistors in high-current or high-voltage extensions |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Set via two external resistors (R1/R2); 1.25 V reference enables outputs from ~1.25 V to >40 V |
| Active current limiting | Hardware-based cycle-by-cycle protection using IPK pin; prevents switch failure during overload or short-circuit |
| Dual configuration support | Internal Darlington switch (≤1.5 A) or external transistor drive (DRC pin) for scalable power handling |
| Wide input voltage range | Operates from 3 V (e.g., single Li-ion) to 40 V (e.g., 24 V industrial bus), eliminating need for pre-regulation |
| Temperature-stable reference | 1.25 V ±2% over -40 °C to +125 °C ensures consistent regulation across full operating range |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: 24 V AC/DC input converted to regulated 5 V/1 A for PLC I/O modules. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing step-down topology with fixed-frequency PWM and current-mode protection. Use Value: Enables compact, cost-effective power stage with built-in current limiting and -40 °C to +125 °C operation for factory-floor reliability. |
Use Scenario: Single-cell Li-ion (3.0–4.2 V) boosted to 5 V for portable data loggers. IC Role / Device Role / Timing Role: Step-up controller managing inductor charging/discharging cycles and regulating output via feedback divider. Use Value: Delivers 89% efficiency at 175 mA load while maintaining regulation across battery discharge curve. |
| Automotive Body Control Module | Medical Sensor Interface |
|
Use Scenario: 12 V vehicle battery stepped down to isolated 3.3 V for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: High-reliability step-down controller with thermal shutdown margin and robust ESD-tolerant pin structure. Use Value: Qualified for extended temperature range (-40 °C to +125 °C) and withstands load-dump transients up to 40 V. |
Use Scenario: Inverting converter generating -12 V from 5 V USB supply for op-amp biasing in EEG front-end. IC Role / Device Role / Timing Role: Voltage-inverting controller providing clean negative rail with low ripple (<230 mV p-p) and tight line regulation (15 mV). Use Value: Eliminates need for dual-output transformers or discrete charge-pump ICs in space-constrained medical PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063ACD-TR | 0 °C to +70 °C ambient rating; same electrical specs but lower temp grade | Restricted to commercial-grade equipment (e.g., consumer test gear, non-automotive embedded) | Select when cost sensitivity outweighs extended temperature requirement and board-level thermal management is sufficient |
| LM2574N-5.0 | Fixed 5 V output; no external feedback divider needed; 0.5 A switch current; 52 kHz fixed frequency | Not adjustable; limited to step-down only; unsuitable for inverting or step-up topologies | Choose only for simple 5 V buck conversion where footprint, BOM count, and design simplicity are prioritized over flexibility |
Compared with MC34063ACD-TR, the MC34063EBD offers wider temperature capability critical for under-hood or industrial use; versus LM2574N-5.0, it trades fixed-output convenience for full topology flexibility and higher current handling.
Availability
MC34063EBD is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, automotive body control modules, and medical sensor interfaces requiring stable component supply across extended temperature ranges.
Supply support for MC34063EBD 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.
The MC34063 series belongs to ST's legacy analog power controller product line, developed specifically for cost-sensitive, topology-flexible DC-DC conversion in resource-constrained embedded systems.
FAQ
What is the minimum input voltage required for MC34063EBD startup?
The MC34063EBD has a typical start-up voltage of 1.5 V, meaning it begins oscillating and regulating once VCC reaches this threshold. This allows operation directly from partially discharged Li-ion cells or low-voltage industrial rails. Startup behavior is verified across temperature and process corners per ST's production test flow.
Can MC34063EBD drive an external MOSFET instead of using its internal switch?
Yes-the DRC (pin 8) provides an open-collector driver output capable of sinking up to 100 mA, designed explicitly to drive external NPN or PNP transistors. When used with an external N-channel MOSFET, a level-shifting gate driver stage is required due to DRC's bipolar output architecture and lack of high-side drive capability.
How does the current limit function interact with the oscillator timing?
The IPK current limit operates independently of oscillator timing: when voltage across RSC exceeds 300 mV (typ.), the internal comparator forces immediate switch turn-off for that cycle, overriding normal oscillator control. This cycle-by-cycle limiting preserves timing stability while preventing thermal runaway during overload conditions.
Is MC34063EBD RoHS-compliant and halogen-free?
Yes-MC34063EBD is manufactured in ST's ECOPACK2-compliant SO-8 package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. Full compliance documentation, including material declarations and test reports, is available through ST's official quality portal.
MC34063EBD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 38V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 33kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063EBD FAQ
1.How can I place an order for MC34063EBD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063EBD 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 MC34063EBD reliable?
The price and inventory of MC34063EBD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063EBD is usually 5 days.
3.What payment methods are accepted for MC34063EBD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063EBD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063EBD?
MC34063EBD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063EBD 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 MC34063EBD?
For technical support, including MC34063EBD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063EBD requirements.
6.How does Aetrix verify that MC34063EBD is sourced from the original manufacturer or authorized distributors?
All MC34063EBD 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 MC34063EBD meets industry standards.
7.What is the process for return or replacement of MC34063EBD?
All MC34063EBD units undergo pre-shipment inspection (PSI). If there is an issue with MC34063EBD, 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 MC34063EBD part is unused and in its original packaging.
Return procedure for MC34063EBD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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