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STMicroelectronics MC34063ECD
- Part No.:
- MC34063ECD
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063ECD.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
MC34063ECD 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%), comparator, oscillator with timing capacitor control, active current limiting, driver, and 1.5 A Darlington output switch. Operates from 3 V to 40 V input, supports up to 100 kHz switching, and delivers stable regulation in industrial power supplies and battery-powered systems.
For engineers reviewing the MC34063ECD datasheet, MC34063ECD pinout, MC34063ECD application, or MC34063ECD equivalent, key selection criteria include its adjustable output voltage via external resistors, low 2.5 mA quiescent current, ±2% reference accuracy, and SO-8 package suitability for space-constrained PCB layouts.
Technical Context
The MC34063ECD implements a fixed-frequency, duty-cycle-controlled oscillator whose frequency is set by an external timing capacitor (CT) and internal charge/discharge currents (ICHG = 33 µA typ., IDISCHG = 200 µA typ.). Its current-limiting function relies on sensing voltage at Pin 7 (IPK), triggering at 300 mV (typ.) to protect the internal switch during overload.
It features dual-output-stage flexibility: Pin 1 (SWC) and Pin 8 (DRC) support both Darlington (low VCE(sat) = 1.3 V @ 1 A) and common-emitter configurations, while Pin 5 (CII) serves as the comparator's inverting input for feedback loop closure. The device operates across –40 °C to 125 °C (EB series rating), distinguishing it from AC/EC variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 40 V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Reference Voltage | 1.25 V ±2% - enables precise output adjustment with minimal resistor tolerance impact on regulation accuracy. |
| Output Switch Current | 1.5 A - sufficient to drive external NPN transistors or directly power moderate-load converters. |
| Oscillator Frequency | 24–42 kHz (typ. 33 kHz) - balances efficiency, EMI, and inductor size for cost-sensitive designs. |
| Quiescent Current | 2.5 mA (typ.) - ensures low standby power in always-on battery applications like portable instrumentation. |
| Current Limit Threshold | 300 mV (typ.) at Pin 7 - sets peak switch current via RSC = 0.3 Ω/A, enabling predictable overcurrent protection. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
MC34063ECD is housed in an SO-8 surface-mount package (8-pin, 1.27 mm pitch), compliant with ECOPACK environmental standards and optimized for thermal performance (RthJC = 20 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SWC) | Switch collector | High-current Darlington collector node; connects to inductor in boost or flyback configurations. |
| 2 (SWE) | Switch emitter | Emitting node of internal Darlington pair; tied to ground in buck topology or used as current-sense return. |
| 3 (TC) | Timing capacitor | Connects external CT to set oscillator frequency; determines switching period via ICHG/IDISCHG ratio. |
| 4 (GND) | Ground | Power and signal reference plane; must be low-impedance for stable current limit and oscillator operation. |
| 5 (CII) | Comparator inverting input | Feedback node for output voltage regulation; compares divided output against 1.25 V reference. |
| 6 (VCC) | Voltage supply | Primary power input (3–40 V); powers internal circuitry and charges timing capacitor. |
| 7 (IPK) | IPK sense | Current limit detection input; voltage drop across RSC triggers shutdown when ≥300 mV. |
| 8 (DRC) | Driver collector | Alternative high-side driver output; used with external PNP/NPN for higher-power or inverted topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Set via two external resistors (R1/R2) referenced to 1.25 V ±2%, enabling precise regulation from 1.25 V to >40 V. |
| Integrated current limiting | Active, cycle-by-cycle protection triggered at 300 mV sense voltage, eliminating need for external current-sense ICs. |
| Dual-switch configuration support | Pins 1 and 8 allow either Darlington (low saturation) or common-emitter (higher gain) output staging for topology flexibility. |
| Wide input range operation | 3 V to 40 V input compatibility enables direct use with 12 V/24 V industrial rails and single-cell LiFePO₄ batteries. |
| Thermal robustness | Rated for 150 °C junction temperature and –40 °C to +125 °C ambient, supporting unheated enclosures in harsh environments. |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Generating isolated 5 V or 12 V rails from 24 V truck battery systems with transient immunity. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing step-down conversion with active current limiting and thermal shutdown. Use Value: Delivers 80% efficiency at 500 mA load (VIN = 25 V → VOUT = 5 V) while surviving cold-crank down to 6 V. |
Use Scenario: Powering microcontrollers and CAN transceivers in door modules using 12 V vehicle battery. IC Role / Device Role / Timing Role: Regulated step-down controller with integrated 1.25 V reference and 2% accuracy for stable logic supply. Use Value: Maintains ±5 mV line regulation across 15–25 V input variation, critical for ADC reference stability. |
| Portable Medical Instruments | IoT Sensor Nodes |
|
Use Scenario: Boosting single Li-ion cell (3.0–4.2 V) to 5 V for USB-powered diagnostics equipment. IC Role / Device Role / Timing Role: Step-up converter controller driving external MOSFET with programmable 33 kHz switching frequency. Use Value: Achieves 89% efficiency at 175 mA output with <300 mV ripple, minimizing heat in sealed handheld enclosures. |
Use Scenario: Inverting 3.3 V rail to –5 V for analog front-end op-amps in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Voltage-inverting controller using Pin 8 (DRC) to drive external PNP transistor for negative output generation. Use Value: Provides 58% efficiency at 100 mA load with 20 mV load regulation, enabling reliable biasing of precision amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-5.0 | Fixed 5 V output; no adjustable reference; higher quiescent current (7.5 mA); max input 40 V. | Limited to fixed-output designs; lacks IPK sense pin for custom current limiting. | Choose when board space allows DIP-8 and fixed 5 V simplifies BOM. |
| TPS54202DR | Sync buck controller; 4.5–28 V input; 2 A output; requires external FETs; 500 kHz switching. | Higher efficiency and density but needs gate drivers, bootstrap circuit, and compensation network. | Prefer for new designs needing >90% efficiency and smaller magnetics at cost premium. |
Compared with LM2574N-5.0, MC34063ECD offers adjustable output and lower IQ; versus TPS54202DR, it trades higher integration and simplicity for lower switching frequency and efficiency-ideal for legacy-compatible, cost-driven industrial upgrades.
Availability
MC34063ECD 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 production lifecycles.
Supply support for MC34063ECD 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, specializing in power management, microcontrollers, and automotive-grade ICs with broad manufacturing scale and AEC-Q100 qualification capability.
MC34063ECD belongs to ST's legacy DC-DC controller product line, engineered for rugged, low-cost, and design-flexible voltage conversion in industrial and automotive subsystems where reliability and long-term availability are critical.
FAQ
What is the maximum output current achievable with MC34063ECD in a step-down configuration?
The internal Darlington switch supports 1.5 A peak current, but practical continuous output depends on thermal design and external components. With proper heatsinking and SO-8 PCB layout (RthJA ≈ 160 °C/W), sustained 500 mA at 80% efficiency is verified per datasheet test conditions (VIN = 25 V → VOUT = 5 V). Exceeding this requires external NPN/PNP switching.
Can MC34063ECD operate from a 3.3 V input to generate 5 V output?
No-MC34063ECD cannot boost 3.3 V to 5 V because its minimum operating voltage is 3 V, but the internal switch VCE(sat) (~1.3 V in Darlington mode) and rectifier forward drop consume headroom. Minimum viable input for 5 V boost is ~4.5 V; for true 3.3 V–to–5 V conversion, a dedicated low-VIN boost IC like TPS61099 is required.
How does the IPK (Pin 7) current limit function interact with external transistor configurations?
Pin 7 senses voltage across RSC placed between SWE (Pin 2) and ground. When used with external NPN transistors (e.g., Figure 19), RSC remains in the emitter path of the internal switch, so the same 300 mV threshold applies. For PNP-based topologies (Figure 21), RSC must be relocated to the PNP emitter to maintain correct sensing polarity and scaling.
Is MC34063ECD pin-compatible with MC34063ACD-TR?
Yes-both are SO-8 packaged variants sharing identical pinout, electrical characteristics, and thermal specs. However, MC34063ECD is rated for –40 °C to +125 °C (EB series), while MC34063ACD-TR is rated 0 °C to +70 °C (AC series); substituting requires validation of ambient temperature margins in the target application.
MC34063ECD 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063ECD FAQ
1.How can I place an order for MC34063ECD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ECD 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 MC34063ECD reliable?
The price and inventory of MC34063ECD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ECD is usually 5 days.
3.What payment methods are accepted for MC34063ECD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ECD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ECD?
MC34063ECD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ECD 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 MC34063ECD?
For technical support, including MC34063ECD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ECD requirements.
6.How does Aetrix verify that MC34063ECD is sourced from the original manufacturer or authorized distributors?
All MC34063ECD 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 MC34063ECD meets industry standards.
7.What is the process for return or replacement of MC34063ECD?
All MC34063ECD units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ECD, 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 MC34063ECD part is unused and in its original packaging.
Return procedure for MC34063ECD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC34063ECD Tags
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