My Inquiry
My Account
STMicroelectronics MC34063ABD-TR
- Part No.:
- MC34063ABD-TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063ABD-TR.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:92,272
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC34063ABD-TR from STMicroelectronics is a monolithic DC-DC converter control circuit supporting step-up, step-down, and voltage-inverting topologies. It integrates a temperature-compensated 1.25 V reference (±2%), comparator, oscillator (24–42 kHz), active current limit, driver, and 1.5 A Darlington output switch. Operates from 3 V to 40 V input, with 2.5 mA typical quiescent current - used in compact industrial power supplies and battery-powered instrumentation.
For engineers reviewing the MC34063ABD-TR datasheet, MC34063ABD-TR pinout, MC34063ABD-TR application, or MC34063ABD-TR equivalent, key selection criteria include its adjustable output voltage via two external resistors, internal current limiting at 300 mV sense threshold, SO-8 package thermal resistance (160 °C/W), and compatibility with discrete external switches for higher power.
Technical Context
The device implements a fixed-frequency, duty-cycle-controlled oscillator whose timing is set by an external capacitor on Pin 3 (TC). The internal comparator compares feedback from Pin 5 (CII) against the 1.25 V reference to regulate output voltage across all topologies.
Current limiting is achieved by sensing voltage across an external resistor connected to Pin 7 (IPK), with a precise 300 mV (typ.) threshold. The high-current Darlington switch (Pins 1/SWC and 2/SWE) supports ≥1.5 A peak current and features 1.3 V (typ.) saturation voltage at 1 A in Darlington configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 40 V - enables direct operation from 12 V automotive rails or wide-range industrial inputs without pre-regulation. |
| Reference Voltage | 1.25 V ±2% - sets output accuracy baseline; output = 1.25 × (1 + R2/R1) with external resistor divider. |
| Switch Current Limit | 1.5 A (min) - defined by 300 mV IPK sense threshold and external RSC; protects switch and inductor during overload. |
| Oscillator Frequency | 24–42 kHz (typ. 33 kHz) - determined by CT capacitor; lower frequency allows larger, lower-cost magnetics. |
| Quiescent Current | 2.5 mA (typ.) - enables efficient light-load operation in battery-powered systems with standby modes. |
| Saturation Voltage (VCE(sat)) | 1.3 V (typ., Darlington, ISW = 1 A) - directly impacts conduction loss and thermal design in high-current step-down converters. |
| Operating Temperature | -40 °C to +85 °C - AB-grade rating suitable for extended-temperature industrial environments. |
Pinout & Package
MC34063ABD-TR is housed in a surface-mount SO-8 (Small Outline-8) package with standard 1.27 mm pitch, 5.0 mm × 4.0 mm body, and 160 °C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SWC) | Switch collector | High-side Darlington collector node; connects to inductor/transformer primary in step-up or to input rail in step-down. |
| 2 (SWE) | Switch emitter | Emitting node of internal Darlington; tied to ground in step-up, to output in step-down, or to virtual ground in inverting config. |
| 3 (TC) | Timing capacitor | Connects external capacitor to set oscillator frequency; discharge/charge current ratio determines fOSC. |
| 4 (GND) | Ground reference | Analog and power ground return for internal circuits; must be low-impedance and separated from noisy power paths. |
| 5 (CII) | Comparator inverting input | Feedback node for output regulation; referenced to 1.25 V internal bandgap; drives error amplifier. |
| 6 (VCC) | Power supply input | Primary supply pin; powers internal logic, reference, and driver; bypassing with 10 µF recommended. |
| 7 (IPK) | Current limit sense | Monitors voltage drop across external RSC; triggers shutdown when ≥300 mV (typ.) to protect switch. |
| 8 (DRC) | Driver collector | Open-collector NPN driver output; used to drive external PNP/NPN transistors for higher output power. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output topology | Supports step-up, step-down, and inverting configurations using same IC - reduces BOM count and design reuse effort. |
| Internal 1.25 V reference | ±2% accuracy over temperature ensures stable output regulation without trimming; eliminates need for external precision reference. |
| Darlington output switch | 1.5 A rated switch with integrated driver - simplifies discrete switch selection and layout while maintaining thermal margin. |
| Active current limiting | 300 mV (typ.) IPK threshold enables accurate, repeatable foldback protection without external op-amps or comparators. |
| Low quiescent current | 2.5 mA typical ICC allows >80% efficiency at light loads in battery-operated devices such as portable meters. |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Compact 24 V to 5 V/1 A isolated or non-isolated supply in PLC I/O modules. IC Role / Device Role / Timing Role: Step-down controller regulating output via external inductor, diode, and feedback resistors. Use Value: Enables single-chip solution with <1.3 V VCE(sat) minimizing heat sink requirements in sealed enclosures. |
Use Scenario: Portable multimeter requiring 9 V output from dual AA cells (1.8–3.2 V input). IC Role / Device Role / Timing Role: Step-up controller operating in discontinuous mode with 33 kHz switching for low EMI. Use Value: 2.5 mA quiescent current extends battery life beyond 200 hours in standby mode. |
| Voltage Inverting Converter | Automotive Subsystem Supply |
|
Use Scenario: Generating -12 V rail from 12 V vehicle battery for op-amp biasing in sensor signal conditioning. IC Role / Device Role / Timing Role: Inverting topology controller with split feedback network referencing GND and VOUT. Use Value: 40 V absolute max VCC withstands load-dump transients up to 35 V without external clamping. |
Use Scenario: 5 V/500 mA auxiliary supply for infotainment microcontroller from 9–16 V nominal battery. IC Role / Device Role / Timing Role: Step-down controller with external Schottky diode and 100 µH inductor. Use Value: -40 °C to +85 °C AB-grade rating ensures reliable startup and regulation across full automotive ambient range. |
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; 0.5 A switch; requires external compensation. | Limited to fixed-output step-down only; no inverting or boost capability. | Select when 5 V output and simplicity outweigh topology flexibility and current capability. |
| TL494CN | Dual-error amplifier; PWM modulator; 200 mA output drivers; requires external MOSFETs; 1–300 kHz programmable frequency. | Higher complexity but supports push-pull, full-bridge, and synchronous rectification designs. | Select for multi-rail or high-efficiency designs where discrete FET control and frequency tuning are required. |
Compared with LM2574N-5.0 and TL494CN, MC34063ABD-TR uniquely balances topology versatility, integrated 1.5 A switch, and minimal external component count - making it optimal for cost-sensitive, space-constrained DC-DC designs needing ≥1 A output across multiple voltage configurations.
Availability
MC34063ABD-TR is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, and automotive subsystem supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC34063ABD-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 analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
MC34063ABD-TR belongs to ST's legacy DC-DC controller product line, engineered for robust, low-component-count switching power supplies in cost-sensitive and thermally constrained applications.
FAQ
What is the maximum output current achievable with MC34063ABD-TR in step-down configuration?
In standard step-down configuration with internal switch, MC34063ABD-TR delivers up to 750 mA continuous output current at 5 V with 24 V input, limited by thermal dissipation in SO-8 package (160 °C/W). Peak switch current remains 1.5 A, but sustained current depends on layout, heatsinking, and ambient temperature - verified per Figure 15 test conditions showing 500 mA at 80% efficiency.
Can MC34063ABD-TR operate below 3 V input?
No. The absolute minimum operating supply voltage is 3 V as specified in the Electrical Characteristics table. Below this, internal reference and oscillator fail to start reliably; measured VSTART-UP is 2.1 V (typ.), but functional operation requires ≥3 V to maintain regulation, current limiting, and oscillator stability across temperature.
How does the IPK current limit function differ between MC34063ABD-TR and MC34063EBD-TR?
Both share identical 300 mV (typ.) IPK sense threshold and active current limiting architecture. The difference lies in temperature range: AB-grade (MC34063ABD-TR) operates from -40 °C to +85 °C, while EB-grade extends to +125 °C junction temperature - critical for under-hood automotive applications where thermal headroom is constrained.
Is the DRC pin (Pin 8) intended for driving external MOSFETs or bipolar transistors?
Pin 8 (DRC) is an open-collector NPN driver output optimized for driving external PNP or NPN bipolar transistors - not logic-level MOSFETs. Its 100 mA absolute max collector current and lack of gate-drive voltage swing make it unsuitable for direct MOSFET gate control; external level-shifting or dedicated gate drivers are required for MOSFET interfacing.
MC34063ABD-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063ABD-TR FAQ
1.How can I place an order for MC34063ABD-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ABD-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 MC34063ABD-TR reliable?
The price and inventory of MC34063ABD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ABD-TR is usually 5 days.
3.What payment methods are accepted for MC34063ABD-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ABD-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ABD-TR?
MC34063ABD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ABD-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 MC34063ABD-TR?
For technical support, including MC34063ABD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ABD-TR requirements.
6.How does Aetrix verify that MC34063ABD-TR is sourced from the original manufacturer or authorized distributors?
All MC34063ABD-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 MC34063ABD-TR meets industry standards.
7.What is the process for return or replacement of MC34063ABD-TR?
All MC34063ABD-TR units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ABD-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 MC34063ABD-TR part is unused and in its original packaging.
Return procedure for MC34063ABD-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC34063ABD-TR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
