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STMicroelectronics MC34063ABN
- Part No.:
- MC34063ABN
- Manufacturer:
- STMicroelectronics
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC34063ABN.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:5,482
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Product details
Overview
MC34063ABN from STMicroelectronics is a monolithic DC-DC converter control circuit in DIP-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 internal oscillator up to 100 kHz and active current limiting-used in industrial power supplies and battery-powered instrumentation.
For engineers reviewing the MC34063ABN datasheet, MC34063ABN pinout, MC34063ABN application, or MC34063ABN equivalent, key selection factors include its Darlington output stage saturation voltage (1.3 V typ. at 1 A), IPK sense threshold (300 mV), timing capacitor-based frequency control, and -40°C to +85°C operating range for AB-grade reliability.
Technical Context
The MC34063ABN integrates a temperature-compensated 1.25 V reference, comparator, duty-cycle-controlled oscillator, driver, and high-current Darlington switch. Its oscillator frequency is set by an external timing capacitor (CT) and scales linearly with charge/discharge current ratio (IDISCHG/ICHG = 6.2 typ.).
Current limiting is implemented via IPK sense pin (Pin 7) monitoring voltage across an external sense resistor; the 300 mV threshold triggers active foldback. The device operates in discontinuous conduction mode for boost/invert or continuous mode for buck, with start-up voltage as low as 2.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output switch current | 1.5 A max - supports ≥1.2 A sustained load in step-down with margin for transient peaks |
| Reference voltage accuracy | ±2% - enables ±2.5% output regulation tolerance with external resistor divider |
| Supply voltage range | 3 V to 40 V - accommodates wide-input 12 V/24 V industrial rails and single-cell LiFePO₄ to 10S battery stacks |
| Oscillator frequency | 24–42 kHz (typ. 33 kHz) - sets practical switching frequency for cost-effective magnetics and EMI control |
| Quiescent current | 2.5 mA typ. - ensures low no-load power loss in always-on auxiliary supplies |
| IPK sense voltage | 300 mV typ. - defines current limit threshold with 0.3 Ω sense resistor for 1 A trip point |
| VCE(sat) - Darlington | 1.3 V typ. at 1 A - determines conduction loss and thermal rise in high-current buck stages |
Pinout & Package
DIP-8 through-hole package with 0.3-inch body width, 2.54 mm lead pitch, and JEDEC MS-001 compliant mechanical outline. Pin 1 marked with notch or dot; leads are tin-lead (Pb-free option available per ECOPACK).
| 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 inverters |
| 2 SWE | Switch emitter | Emitting node of internal Darlington - tied to ground in standard configurations; used for current sensing in some layouts |
| 3 TC | Timing capacitor | Connects external CT to set oscillator frequency; discharge current dominates timing period |
| 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 voltage regulation - connected to resistor divider from VOUT |
| 6 VCC | Power supply input | Primary bias rail - powers internal circuitry and drives external switch gate/base when used with external transistors |
| 7 IPK | Current limit sense | Monitors voltage drop across external sense resistor - trips shutdown when ≥300 mV |
| 8 DRC | Driver collector | Open-collector NPN output - drives external PNP or NPN transistor base in high-power extensions |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Darlington switch | 1.5 A capability eliminates need for external main switch in ≤5 W converters |
| Adjustable output voltage | Set via two-resistor divider referenced to 1.25 V ±2% - supports 1.25 V to >40 V outputs |
| Active current limiting | Real-time IPK monitoring with 300 mV threshold - prevents thermal runaway during overload or short-circuit |
| Low-startup voltage | 2.1 V minimum - enables operation from single LiFePO₄ cell (2.5–3.6 V) or energy-harvesting sources |
| Multi-topology support | Native configuration for boost, buck, and inverting - reduces BOM count across power architecture variants |
Applications
| Industrial Sensor Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Providing isolated 5 V rail from 12 V vehicle battery for Hall-effect sensors and CAN transceivers. IC Role / Device Role / Timing Role: Step-down controller regulating output with ±2% reference and active current limit during cold-crank dips. Use Value: Maintains stable 5 V under 6–16 V input variation and survives 40 V load-dump transients due to 40 V absolute max rating. |
Use Scenario: Generating -12 V bias for op-amp comparators in window-lift motor controllers. IC Role / Device Role / Timing Role: Voltage-inverting converter using discontinuous mode with timing capacitor set for 33 kHz operation. Use Value: Delivers regulated negative rail without requiring dual-supply ICs - reduces system component count and layout area. |
| Portable Medical Instrumentation | Smart Building HVAC Controller |
|
Use Scenario: Boosting 3.3 V from Li-ion battery to 12 V for piezoelectric actuator drivers. IC Role / Device Role / Timing Role: Step-up controller with Darlington switch and external Schottky diode, optimized for 89% efficiency at 175 mA. Use Value: Achieves >85% efficiency across 3.0–4.2 V input range while maintaining <300 mV output ripple for analog signal integrity. |
Use Scenario: Deriving 5 V and 3.3 V rails from 24 V building power bus for microcontroller and wireless SoC subsystems. IC Role / Device Role / Timing Role: Dual-output configuration using external PNP and NPN switches driven by DRC and SWC pins. Use Value: Enables independent regulation of two voltages from one controller - simplifies power tree and improves thermal distribution. |
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) | Limited to single-output fixed-voltage designs; lacks IPK sense and multi-topology flexibility | Select when only 5 V output is required and board space permits larger inductor due to 52 kHz fixed frequency |
| TPS54202DR | Integrated 2 A MOSFET; 4.5–28 V input; requires external compensation; 2.5 µA shutdown current | Higher integration but needs careful loop compensation; not pin-compatible; no inverting topology support | Prefer for higher-efficiency, lower-noise 2 A buck designs where PCB area and thermal performance outweigh design complexity |
Compared with LM2574N-5.0 and TPS54202DR, the MC34063ABN offers topology flexibility and adjustable output at the cost of discrete magnetics and manual compensation - making it optimal for cost-sensitive, multi-rail, or legacy-replacement designs where BOM simplicity matters more than footprint.
Availability
MC34063ABN is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive body electronics, portable medical instrumentation, and smart building HVAC controllers requiring stable component supply across extended temperature ranges.
Supply support for MC34063ABN 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 robust, low-cost DC-DC conversion in resource-constrained embedded systems where reliability and long-term availability are critical.
FAQ
What is the maximum recommended output current for MC34063ABN in step-down configuration?
The MC34063ABN supports up to 1.2 A continuous output current in step-down mode with proper heatsinking and layout. At 1 A, typical VCE(sat) is 1.3 V, yielding ~1.3 W dissipation in the DIP-8 package - requiring thermal resistance ≤100°C/W to stay within 150°C junction limit. Efficiency drops below 80% above 1.2 A due to conduction and switching losses.
Can MC34063ABN drive an external MOSFET instead of using its internal switch?
Yes - Pin 8 (DRC) provides an open-collector NPN driver capable of sinking ≥100 mA, suitable for driving the gate of an external N-channel MOSFET via pull-up resistor, or base of a PNP transistor. This extends output current beyond 1.5 A and enables synchronous rectification or high-side switching in custom topologies.
How does the IPK current limit function differ between MC34063ABN and MC34063ACN?
Both share identical IPK sense threshold (300 mV typ.), but the ABN grade specifies operation from -40°C to +85°C, while ACN is rated 0°C to +70°C. Thermal drift of VIPK is ±10 mV over full ABN range per Figure 8, ensuring consistent current limiting across industrial ambient conditions - unlike ACN, which may exhibit wider variation below 0°C.
Is MC34063ABN RoHS-compliant and halogen-free?
Yes - MC34063ABN is manufactured in ST's ECOPACK2-compliant DIP-8 package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. Lead finish is matte tin, and packaging conforms to JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30°C/85% RH).
MC34063ABN 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
MC34063ABN FAQ
1.How can I place an order for MC34063ABN through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ABN 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 MC34063ABN reliable?
The price and inventory of MC34063ABN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ABN is usually 5 days.
3.What payment methods are accepted for MC34063ABN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ABN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ABN?
MC34063ABN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ABN 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 MC34063ABN?
For technical support, including MC34063ABN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ABN requirements.
6.How does Aetrix verify that MC34063ABN is sourced from the original manufacturer or authorized distributors?
All MC34063ABN 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 MC34063ABN meets industry standards.
7.What is the process for return or replacement of MC34063ABN?
All MC34063ABN units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ABN, 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 MC34063ABN part is unused and in its original packaging.
Return procedure for MC34063ABN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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