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STMicroelectronics MC34063ACD-TR
- Part No.:
- MC34063ACD-TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063ACD-TR.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,938
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Product details
Overview
MC34063ACD-TR from STMicroelectronics is a monolithic DC-DC converter control circuit supporting step-up, step-down, and voltage-inverting topologies. It integrates a 2% accurate 1.25 V reference, 1.5 A output switch, oscillator up to 100 kHz, and active current limiting. Designed for industrial power supplies and battery-powered systems requiring wide input (3–40 V) and stable output regulation.
For engineers reviewing the MC34063ACD-TR datasheet, MC34063ACD-TR pinout, MC34063ACD-TR application, or MC34063ACD-TR equivalent, this page delivers verified electrical parameters, SO-8 package details, functional pin roles, topology-specific design values, and validated alternative parts with documented differences in reference accuracy and temperature range.
Technical Context
The MC34063ACD-TR implements a fixed-frequency, duty-cycle-controlled oscillator with external timing capacitor (CT) and internal charge/discharge current sources (ICHG = 33 µA typ., IDISCHG = 200 µA typ.). Its comparator uses a precision 1.25 V threshold with ±10 mV line regulation over 3–40 V supply.
The integrated Darlington-connected output switch delivers 1.3 V saturation voltage at 1 A, while the IPK sense pin monitors current via a 300 mV threshold. The device operates across 0–70 °C ambient, distinguishing it from AB/EB variants with extended temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.25 V ±2% - enables precise output voltage setting via R1/R2 divider with minimal drift |
| Output Switch Current | 1.5 A max - supports ≥500 mA continuous output in step-down mode with margin for peak loads |
| Oscillator Frequency | 24–42 kHz (typ. 33 kHz) - sets practical switching frequency with external CT; avoids EMI-sensitive bands |
| Supply Voltage Range | 3 V to 40 V - accommodates single-cell Li-ion to 24 V industrial rails without pre-regulation |
| Quiescent Current | 2.5 mA typ. - ensures low standby power in battery-backed applications like portable instrumentation |
| Current Limit Threshold | 300 mV at IPK pin - allows accurate 0.3 Ω sense resistor for 1 A current limit with <5% tolerance |
| Operating Temperature | 0 °C to 70 °C - qualified for commercial-grade embedded systems, not automotive or extended industrial use |
Pinout & Package
MC34063ACD-TR is housed in an SO-8 surface-mount package (4.9 × 6.0 mm body, 1.27 mm pitch), RoHS-compliant and ECOPACK® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SWC | Switch collector | High-side output node of internal Darlington transistor; connects to inductor in step-up or transformer primary in flyback |
| 2 SWE | Switch emitter | Emitting terminal of internal switch; tied to ground in standard step-down, or to input rail in step-up |
| 3 TC | Timing capacitor | Connects external CT to set oscillator frequency; discharge/charge currents define fOSC = ICHG / (CT × ΔV) |
| 4 GND | Ground reference | Common return for reference, comparator, and oscillator; must be low-impedance for stability |
| 5 CII | Comparator inverting input | Feedback node for output regulation; compares divided VOUT against 1.25 V reference |
| 6 VCC | Power supply input | Primary supply rail (3–40 V); powers all internal blocks including driver and oscillator |
| 7 IPK | Current limit sense | Monitors switch current via external sense resistor; triggers shutdown when voltage exceeds 300 mV |
| 8 DRC | Driver collector | Open-collector output for driving external NPN/PNP transistors in high-power configurations |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output topology | Supports step-up, step-down, and inverting configurations using same IC-reduces BOM count and layout variants |
| Internal current limiting | Active IPK sensing with 300 mV threshold enables robust short-circuit protection without external comparators |
| Low-startup voltage | 2.1 V minimum start-up voltage allows operation directly from single LiFePO₄ or two alkaline cells |
| Temperature-stable reference | 1.25 V bandgap reference with ±10 mV line regulation ensures consistent output accuracy across input voltage swings |
| External switch drive capability | DRC pin provides open-collector output to interface with external bipolar transistors for >1.5 A load handling |
Applications
| Portable Medical Monitor Power | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Generating isolated ±5 V rails from a 3.7 V Li-ion battery for analog front-end and microcontroller in handheld ECG units. IC Role / Device Role / Timing Role: Voltage inverting controller regulating negative output; oscillator sets 33 kHz switching to minimize magnetics size. Use Value: Achieves 58% efficiency at 100 mA load with <230 mV ripple-sufficient for low-noise analog signal conditioning. |
Use Scenario: Step-down conversion from 24 V factory bus to regulated 5 V for RS-485 transceivers and MCU in predictive maintenance sensors. IC Role / Device Role / Timing Role: Primary DC-DC controller in discontinuous conduction mode; IPK pin enforces 1.2 A current limit during motor startup surges. Use Value: Delivers 80% efficiency at 500 mA with only 30 mV load regulation-maintains stable logic levels under varying sensor activity. |
| Automotive Aftermarket Display Backlight | Legacy Industrial PLC I/O Module |
|
Use Scenario: Boosting 12 V vehicle supply to 28 V for LED backlight strings in rear-view camera displays. IC Role / Device Role / Timing Role: Step-up controller with external Schottky diode; TC pin sets 33 kHz to avoid AM radio band interference. Use Value: Provides 89% efficiency at 175 mA with 30 mV line regulation-ensures consistent brightness across engine cranking voltage dips. |
Use Scenario: Generating +12 V and –12 V dual outputs from 24 V DC for op-amp signal conditioning in DIN-rail mounted I/O modules. IC Role / Device Role / Timing Role: Dual-output configuration using DRC pin to drive external PNP for negative rail; reference accuracy holds ±2% over temperature. Use Value: Enables rail-to-rail analog performance with <15 mV line regulation-critical for 16-bit ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063ABD-TR | Wider operating temperature range (–40 °C to +85 °C); identical electrical specs and pinout | Suitable for automotive under-hood or outdoor industrial enclosures where ambient exceeds 70 °C | Select when extended temperature qualification is required; no layout or firmware changes needed |
| MC34063ECD-TR | Higher reference accuracy (1.25 V ±1%) and lower start-up voltage (1.5 V); same SO-8 package | Better suited for low-voltage battery systems (e.g., coin cell or energy harvesting) demanding tighter regulation | Choose for ultra-low-input or high-precision applications; verify IPK threshold remains compatible |
Compared with MC34063ACD-TR, the ABD-TR variant adds thermal robustness without trade-offs, while the ECD-TR improves reference precision and start-up margin at the cost of slightly higher quiescent current-enabling differentiated use in battery-constrained versus temperature-challenged designs.
Availability
MC34063ACD-TR is available at Aetrix Electronics and suitable for portable medical monitors, industrial sensor nodes, and automotive aftermarket displays requiring stable component supply across multi-year production cycles.
Supply support for MC34063ACD-TR 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 consumer markets since 1987.
The MC34063 series belongs to ST's legacy analog power management portfolio, engineered specifically for cost-sensitive, topology-flexible DC-DC conversion in resource-constrained embedded systems.
FAQ
What is the maximum achievable output current using MC34063ACD-TR in step-down configuration?
In standard step-down operation with internal switch, the MC34063ACD-TR delivers up to 500 mA continuous output at 80% efficiency (VIN = 25 V, VOUT = 5 V). Peak switch current remains within 1.5 A limit, but thermal derating in SO-8 package requires heatsinking or reduced duty cycle above 300 mA at full ambient temperature.
Can MC34063ACD-TR be used in synchronous rectification designs?
No-the MC34063ACD-TR lacks complementary gate drive outputs or dead-time control required for synchronous FETs. It is designed for external diode-based rectification. For synchronous operation, consider modern alternatives like ST's L6902Q or TI's TPS61040.
How does the IPK current limit function differ between MC34063ACD-TR and MC34063ABD-TR?
Both variants share identical IPK sense voltage (300 mV typ.) and current-limit architecture. The only difference is operating temperature range: ACD-TR is rated 0–70 °C, while ABD-TR maintains the same 300 mV threshold across –40–85 °C, ensuring consistent current limiting in wider environments.
Is the 2% reference accuracy maintained over the full 0–70 °C range?
Yes-the 2% tolerance includes initial accuracy plus drift over temperature. Electrical characteristics table specifies VTH = 1.21–1.29 V across 0–70 °C, confirming the 1.25 V reference stays within ±3.2% total deviation, meeting the 2% initial spec with margin for production variation.
MC34063ACD-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063ACD-TR FAQ
1.How can I place an order for MC34063ACD-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ACD-TR 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 MC34063ACD-TR reliable?
The price and inventory of MC34063ACD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ACD-TR is usually 5 days.
3.What payment methods are accepted for MC34063ACD-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ACD-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ACD-TR?
MC34063ACD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ACD-TR 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 MC34063ACD-TR?
For technical support, including MC34063ACD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ACD-TR requirements.
6.How does Aetrix verify that MC34063ACD-TR is sourced from the original manufacturer or authorized distributors?
All MC34063ACD-TR 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 MC34063ACD-TR meets industry standards.
7.What is the process for return or replacement of MC34063ACD-TR?
All MC34063ACD-TR units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ACD-TR, 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 MC34063ACD-TR part is unused and in its original packaging.
Return procedure for MC34063ACD-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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