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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics MC34063ECD-TR

Name: MC34063ECD-TR
Brand: STMicroelectronics
SKU: MC34063ECD-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC34063ECD-TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MC34063ECD-TR.pdf

Description:: IC REG BUCK BOOST ADJ 1.5A 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:38,090

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Product details

Overview

MC34063ECD-TR from STMicroelectronics is a monolithic DC-DC converter control circuit in SO-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, commonly used in industrial power supplies and battery-powered instrumentation.

For engineers reviewing the MC34063ECD-TR datasheet, MC34063ECD-TR pinout, MC34063ECD-TR application, or MC34063ECD-TR equivalent, key selection criteria include its adjustable output voltage via external resistors, active current limiting at 300 mV sense threshold, Darlington-compatible switch saturation voltage (1.3 V typ.), and thermal performance in SO-8 (R_thJA = 160 °C/W).

Technical Context

The MC34063ECD-TR integrates a temperature-compensated 1.25 V reference, comparator, duty-cycle-controlled oscillator with timing capacitor interface (Pin 3), and a high-current Darlington output switch (Pins 1 & 2). Its current-limiting function operates via IPK sense (Pin 7) with 300 mV threshold, enabling precise overcurrent protection without external sensing components.

Oscillator frequency is set by external timing capacitor (CT) and internal charge/discharge currents (ICHG = 33 µA typ., IDISCHG = 200 µA typ.), yielding 33 kHz typical at CT = 1 nF. The device's dual-mode driver (Pin 8) supports both common-emitter and Darlington configurations, with V_CE(sat) of 0.7 V (forced β ~20) or 1.3 V (Darlington), directly impacting efficiency in low-V_OUT designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output switch current	1.5 A max - supports ≥500 mA output in step-down converters with margin for transient loads
Reference voltage accuracy	±2% - enables stable output regulation with minimal resistor tolerance dependency
Supply voltage range	3 V to 40 V - accommodates wide-input industrial and automotive battery systems
Oscillator frequency	24–42 kHz typ. - balances EMI control and inductor size in cost-sensitive designs
Current limit threshold	300 mV ±50 mV - sets peak switch current via R_SC = 0.3 Ω/A, simplifying overcurrent design
Quiescent current	2.5 mA typ. - ensures low standby power in battery-operated applications
Operating temperature	-40 °C to 125 °C - qualified for extended industrial environments (EB series grade)

Pinout & Package

MC34063ECD-TR is housed in a surface-mount SO-8 package (5.00 × 4.00 mm, 1.27 mm pitch), compliant with ECOPACK environmental standards. Thermal resistance is R_thJA = 160 °C/W and R_thJC = 20 °C/W, requiring minimal copper area for thermal management in ≤1 W dissipation designs.

Pin/Terminal	Circuit Role	Design Meaning
1 SWC	Switch collector	High-side output node for Darlington or common-emitter switch; connects to inductor/transformer primary
2 SWE	Switch emitter	Emitting terminal of internal NPN; tied to ground in step-up, to input in step-down, defining topology grounding
3 TC	Timing capacitor	Controls oscillator frequency via external CT; sets t_on/t_off ratio and switching period
4 GND	Ground reference	Common return for comparator, reference, and oscillator; must be low-impedance for stability
5 CII	Comparator inverting input	Feedback node for output voltage regulation; compares against 1.25 V reference to adjust duty cycle
6 VCC	Power supply input	Bias rail for internal circuitry; must be ≥1.5 V to start oscillator; decoupling capacitor required
7 IPK	Current limit sense	Sense input for switch current monitoring; 300 mV threshold triggers active current limiting
8 DRC	Driver collector	Open-collector driver output; drives external PNP/NPN for higher-power or inverted topologies

Key Features

Feature	Design Value
Integrated Darlington switch	1.5 A capability with 1.3 V V_CE(sat) enables self-contained step-up converters without external transistors
Adjustable oscillator frequency	Configurable 24–100 kHz range via single CT capacitor, allowing optimization of size vs. EMI
Active current limiting	Hardware-based foldback via Pin 7 eliminates need for external current-sense amplifiers or controllers
Wide input voltage range	3–40 V operation supports direct connection to 12 V/24 V rails and Li-ion battery stacks
Three topology support	Native step-up, step-down, and inverting configurations reduce BOM count across multiple power architectures

Applications

Industrial Power Supply

Battery-Powered Instrumentation

Use Scenario: 24 V input to isolated 5 V/500 mA output in PLC I/O modules.

IC Role / Device Role / Timing Role: Step-down controller managing duty cycle and current limit during load transients.

Use Value: Achieves 80% efficiency at full load with only 6 external components, reducing board space and qualification effort.

Use Scenario: Single-cell Li-ion (3.0–4.2 V) to regulated 3.3 V for microcontroller and sensor subsystems.

IC Role / Device Role / Timing Role: Step-up regulator maintaining stable V_CC as battery discharges below 3.3 V.

Use Value: 2.5 mA quiescent current extends runtime; 1.5 A switch handles pulse loads from RF transceivers.

Automotive Body Control Module

Medical Portable Monitor

Use Scenario: 12 V vehicle bus to -12 V analog supply for op-amp biasing in window lift ECUs.

IC Role / Device Role / Timing Role: Voltage-inverting controller generating negative rail with tight line/load regulation.

Use Value: -40 °C to 125 °C operating range meets AEC-Q100 ambient requirements; 15 mV line regulation ensures signal integrity.

Use Scenario: 9 V alkaline battery pack powering LCD backlight (12 V) and analog front-end (5 V) in handheld diagnostics.

IC Role / Device Role / Timing Role: Dual-output controller using external switches to generate multiple regulated rails.

Use Value: SO-8 package enables compact layout; 2% reference accuracy maintains display contrast and 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
LM2574HVSX-5.0/NOPB	Fixed 5 V output; no adjustable reference; integrated switch rated 500 mA	Limited to step-down only; requires fewer external parts but lacks topology flexibility	Select when fixed 5 V output and lower current (≤500 mA) suffice, and board space is constrained
TPS54202DR	42 V input, 2 A synchronous buck controller; 500 kHz switching; requires external FETs	Higher efficiency (>90%) and smaller magnetics, but needs gate drivers and loop compensation	Select for higher efficiency and density where design resources allow complex feedback tuning

Compared with LM2574HVSX-5.0/NOPB, MC34063ECD-TR offers topology flexibility and 1.5 A switch current but requires more external components; versus TPS54202DR, it trades higher integration for lower complexity and cost in <100 kHz, ≤1 W applications.

Availability

MC34063ECD-TR is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, automotive body control modules, and medical portable monitors requiring stable component supply across long production lifecycles.

Supply support for MC34063ECD-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.

The MC34063 series belongs to ST's legacy analog power controller product line, developed for cost-sensitive, robust DC-DC conversion in non-critical industrial and instrumentation applications where simplicity and reliability outweigh ultra-high efficiency demands.

FAQ

What is the minimum input voltage required to start oscillation in MC34063ECD-TR?

The MC34063ECD-TR has a guaranteed start-up voltage of 1.5 V at 25 °C, meaning the internal oscillator begins functioning once V_CC reaches this level. This allows operation from deeply discharged single-cell batteries. Below 1.5 V, the device remains in reset; above it, oscillator frequency scales with V_CC until reaching nominal operation at ≥3 V.

Can MC34063ECD-TR drive an external MOSFET instead of using its internal switch?

Yes - Pin 8 (DRC) provides an open-collector driver output capable of sinking up to 100 mA, designed explicitly to drive external NPN or PNP transistors. When used with an external N-channel MOSFET, a level-shifting stage (e.g., PNP pull-up + gate resistor) is required due to the lack of high-side drive capability. The internal switch remains disabled in such configurations.

How does the current limit function interact with the oscillator frequency setting?

The current limit circuit operates independently of oscillator timing: it monitors voltage across R_SC (connected to Pin 7) and forces immediate switch turn-off when VIPK exceeds 300 mV. Oscillator frequency (set by CT on Pin 3) determines maximum switching rate but does not affect current-limit response time, which is sub-microsecond due to direct comparator action.

Is MC34063ECD-TR RoHS and REACH compliant?

Yes - MC34063ECD-TR is manufactured in ST's ECOPACK2-compliant SO-8 package, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full compliance documentation, including substance declarations and material content reports, is available through ST's official product page and authorized distribution portals.

MC34063ECD-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

MC34063ECD-TR FAQ

1.How can I place an order for MC34063ECD-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for MC34063ECD-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 MC34063ECD-TR reliable?

The price and inventory of MC34063ECD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ECD-TR is usually 5 days.

3.What payment methods are accepted for MC34063ECD-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ECD-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC34063ECD-TR?

MC34063ECD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC34063ECD-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 MC34063ECD-TR?

For technical support, including MC34063ECD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ECD-TR requirements.

6.How does Aetrix verify that MC34063ECD-TR is sourced from the original manufacturer or authorized distributors?

All MC34063ECD-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 MC34063ECD-TR meets industry standards.

7.What is the process for return or replacement of MC34063ECD-TR?

All MC34063ECD-TR units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ECD-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 MC34063ECD-TR part is unused and in its original packaging.

Return procedure for MC34063ECD-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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