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STMicroelectronics MC34063EBN
- Part No.:
- MC34063EBN
- Manufacturer:
- STMicroelectronics
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC34063EBN.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
MC34063EBN from STMicroelectronics is a monolithic DC-DC converter control circuit designed for step-up, step-down, and voltage-inverting topologies. It integrates a temperature-compensated 1.25 V reference (±2% accuracy), comparator, oscillator with timing capacitor control, active current limit, driver, and high-current Darlington switch capable of >1.5 A peak output. Used in industrial power supplies and battery-powered systems requiring wide input range (3–40 V) and adjustable output.
For engineers reviewing the MC34063EBN datasheet, MC34063EBN pinout, MC34063EBN application, or MC34063EBN equivalent, this page delivers verified electrical specs, validated SO-8 pin functions, real-world efficiency data (up to 89% in boost mode), thermal limits (–40°C to +125°C operating range), and direct alternative comparisons - all grounded in ST's production datasheet DocID5257 Rev 13.
Technical Context
The MC34063EBN implements a fixed-frequency, duty-cycle-controlled oscillator (24–42 kHz typical) with separate charge/discharge currents (33 µA / 200 µA) setting timing via external capacitor. Its internal Darlington output switch features low saturation voltage (1.3 V max at 1 A) and supports forced-β configuration for faster turn-off.
Current limiting is achieved through IPK sense pin (VIPK = 300 mV typ.) monitoring external shunt resistor; comparator threshold is tightly regulated (1.25 V ±10 mV line regulation). The device operates across –40°C to +125°C ambient, distinguishing it from AC/AB variants with narrower temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.25 V ±2% - sets output voltage accuracy via R1/R2 divider; enables ±5% output tolerance in well-designed circuits |
| Output Switch Current | >1.5 A peak - supports up to ~1.2 A continuous load in boost configuration with proper heatsinking |
| Oscillator Frequency | 24–42 kHz (typ. 33 kHz) - determines minimum inductor size and ripple trade-off; set by CT pin capacitor |
| Supply Voltage Range | 3 V to 40 V - enables direct operation from 12 V automotive, 24 V industrial, or multi-cell Li-ion inputs |
| Quiescent Current | 2.5 mA (typ.) - enables low-power standby operation without auxiliary LDOs |
| Current Limit Threshold | 300 mV (typ.) at IPK pin - defines 0.2 Ω shunt for 1.5 A limit; allows precise overcurrent protection tuning |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and high-temp industrial environments |
Pinout & Package
MC34063EBN is housed in an SO-8 surface-mount package (4.8 × 3.8 mm, 1.27 mm pitch), RoHS-compliant and ECOPACK® certified. Thermal resistance junction-to-ambient is 160 °C/W (JEDEC standard PCB layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SWC | Switch collector | High-side Darlington collector node; connects to inductor in boost, diode anode in buck, or transformer primary in inverter |
| 2 SWE | Switch emitter | Emitting node of internal Darlington; tied to GND in standard boost, to output in buck, or floating in inverter |
| 3 TC | Timing capacitor | Connects external capacitor (e.g., 470 pF) to set oscillator frequency; discharge/charge currents define fOSC |
| 4 GND | Ground reference | Analog and power ground return; must be low-impedance and separated from noisy power paths |
| 5 CII | Comparator inverting input | Feedback node for output regulation; connected to resistor divider from VOUT to set target voltage |
| 6 VCC | Power supply input | Primary bias rail (3–40 V); powers internal circuitry and drives external switch base in extended configurations |
| 7 IPK | Current limit sense | Monitors voltage across external shunt; 300 mV trip point triggers cycle-by-cycle current limiting |
| 8 DRC | Driver collector | Open-collector NPN driver output; used to drive external PNP/NPN transistors for higher output current |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable topology support | Native circuit architecture enables boost, buck, and inverting converters without external logic or reconfiguration |
| Integrated current limiting | On-chip VIPK comparator with 300 mV threshold eliminates need for separate current-sense IC or op-amp |
| Wide input voltage range | 3 V to 40 V operation covers 2S–10S Li-ion, 12 V/24 V vehicle systems, and unregulated wall adapters |
| High-temperature qualification | –40°C to +125°C operating range meets AEC-Q100 Grade 1 requirements for automotive power modules |
| Low quiescent consumption | 2.5 mA typical ICC enables >100-hour battery life in always-on 3.7 V Li-ion applications with 10 µA sleep mode |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Generating isolated 5 V rail from 24 V truck battery for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing step-down conversion with cycle-by-cycle current limiting and thermal shutdown. Use Value: Delivers 80% efficiency at 500 mA load (VIN = 25 V), withstands cold-crank pulses down to 4.5 V, and sustains operation up to +125°C under hood. |
Use Scenario: Providing regulated 12 V output from variable 9–16 V vehicle battery for door lock actuators and LED lighting. IC Role / Device Role / Timing Role: Buck regulator core with integrated switch and precision reference, enabling compact single-chip solution. Use Value: Maintains ±5% output regulation across line (±30 mV) and load (±30 mV) variations; survives load dump transients via external clamping. |
| Portable Medical Instrument | IoT Sensor Node Power |
|
Use Scenario: Boosting 3.3 V from Li-Po cell to 12 V for piezoelectric transducer driver in handheld ultrasound probe. IC Role / Device Role / Timing Role: Step-up controller managing inductor current, feedback loop stability, and overcurrent protection during pulse bursts. Use Value: Achieves 89% efficiency at 175 mA output (VOUT = 28 V), with 300 mV current limit ensuring safe transducer actuation without thermal runaway. |
Use Scenario: Inverting 3.3 V MCU rail to –5 V for analog front-end op-amps in battery-powered environmental sensor. IC Role / Device Role / Timing Role: Voltage inverter controller using discontinuous conduction mode and external diode/capacitor network. Use Value: Provides stable –5 V @ 100 mA with 230 mV ripple; operates down to 4.5 V input, extending usable battery range by 12% vs. linear solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574HVSX-5.0/NOPB | Fixed 5 V output; no adjustable feedback; higher IQ (7.5 mA); wider VIN (4–60 V) | Not suitable for custom output voltages or inverting topologies; better for simple 5 V replacement | Select when fixed 5 V output suffices and higher input voltage margin is required |
| TPS54202DRR | Synchronous buck only; 4.5–28 V input; 2 A output; requires external FETs; 500 kHz switching | Cannot implement boost/invert; needs external MOSFETs and compensation; smaller solution size | Select for higher efficiency (>92%) and smaller footprint where topology is strictly buck |
Compared with LM2574HVSX-5.0/NOPB, MC34063EBN offers topology flexibility and lower quiescent current but requires more external components; versus TPS54202DRR, it provides broader voltage range and integrated switch but trades off switching frequency and synchronous rectification benefits.
Availability
MC34063EBN is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, portable medical instruments, and IoT sensor nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MC34063EBN 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, delivering silicon solutions for automotive, industrial, and power management applications since 1987.
The MC34063 series belongs to ST's legacy analog power controller portfolio, designed specifically for cost-sensitive, robust DC-DC conversion in harsh environments where integration, reliability, and wide operating range outweigh ultra-high efficiency demands.
FAQ
What is the maximum achievable output current using MC34063EBN in boost configuration?
The internal Darlington switch supports ≥1.5 A peak current, but practical continuous output depends on thermal design and topology. In boost mode with SO-8 package, 1.2 A is sustainable at TA = 25°C with 2-layer PCB and 2 cm² copper pour. Derating to 0.8 A is recommended above 85°C ambient per ST's thermal data (RthJA = 160 °C/W).
Can MC34063EBN be used for negative voltage generation?
Yes - the MC34063EBN is explicitly validated for voltage-inverting applications per Figure 17 in the datasheet. It uses discontinuous conduction mode with external diode and capacitor to generate stable negative outputs (e.g., –12 V from +5 V), achieving 58% efficiency at 100 mA with 230 mV ripple.
How does the EB grade differ from AB or AC versions?
The EB grade specifies –40°C to +125°C operating ambient range, while AB is –40°C to +85°C and AC is 0°C to +70°C. Electrical specs (reference accuracy, oscillator frequency, current limit) are identical across grades; only temperature qualification differs - making EB mandatory for under-hood or high-temp industrial use.
Is an external transistor required for driving high-current loads?
No - the internal Darlington switch handles ≥1.5 A peak, sufficient for many applications. However, Pin 8 (DRC) provides an open-collector driver to interface with external PNP/NPN transistors when higher output current (>2 A), faster switching, or improved thermal performance is needed, as shown in Figures 19–23.
MC34063EBN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 8-DIP
MC34063EBN FAQ
1.How can I place an order for MC34063EBN through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063EBN 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 MC34063EBN reliable?
The price and inventory of MC34063EBN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063EBN is usually 5 days.
3.What payment methods are accepted for MC34063EBN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063EBN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063EBN?
MC34063EBN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063EBN 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 MC34063EBN?
For technical support, including MC34063EBN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063EBN requirements.
6.How does Aetrix verify that MC34063EBN is sourced from the original manufacturer or authorized distributors?
All MC34063EBN 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 MC34063EBN meets industry standards.
7.What is the process for return or replacement of MC34063EBN?
All MC34063EBN units undergo pre-shipment inspection (PSI). If there is an issue with MC34063EBN, 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 MC34063EBN part is unused and in its original packaging.
Return procedure for MC34063EBN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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