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Texas Instruments MC33063ADRE4
- Part No.:
- MC33063ADRE4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063ADRE4.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,559
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Product details
Overview
MC33063ADRE4 from Texas Instruments is a monolithic DC-DC switching regulator controller IC supporting boost, buck, and inverting topologies. It integrates a 1.25-V precision reference (±2%), oscillator (up to 100 kHz), PWM controller with active current limiting, Darlington output switch (1.5-A peak), and comparator. Used in portable blood gas analyzers, HMIs, and telecom power supplies where input ranges from 3 V to 40 V and ambient operation spans –40°C to 85°C.
For engineers reviewing the MC33063ADRE4 datasheet, MC33063ADRE4 pinout, MC33063ADRE4 application, or MC33063ADRE4 equivalent, this page delivers verified functional block details, validated SOIC-8 pin mapping, confirmed thermal resistance (97°C/W), exact current-limit threshold (300 mV typ), and two field-tested alternative parts for topology-flexible DC-DC design.
Technical Context
The MC33063ADRE4 implements a fixed-frequency, current-mode PWM control architecture with internal temperature-compensated 1.25-V reference and active cycle-by-cycle current limiting via Ipk sense pin. Its oscillator uses external timing capacitor CT to set frequency between 24 kHz and 42 kHz (typ) at 5 V supply.
It supports three standard converter configurations: step-up (boost), step-down (buck), and polarity-inverting (buck-boost). The internal Darlington switch enables direct drive of external NPN transistors for higher peak current applications beyond its 1.5-A internal limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 3 V to 40 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Output switch current | 1.5 A peak - sufficient for medium-power converters up to ~10 W without external switch. |
| Oscillator frequency | 24–42 kHz (typ) with 1 nF CT - sets practical switching range balancing efficiency and EMI for discrete inductor designs. |
| Reference voltage | 1.25 V ±2% - enables precise output regulation across temperature (–40°C to 85°C) using resistor feedback divider. |
| Current-limit threshold | 300 mV (typ) at Ipk pin - provides predictable overcurrent protection independent of supply voltage. |
| Supply current | 4 mA max - ensures low quiescent power in standby mode for battery-powered applications. |
| Junction-to-ambient θJA | 97°C/W (SOIC-8) - defines thermal derating curve for continuous operation at full load in still-air environments. |
Pinout & Package
MC33063ADRE4 is housed in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm body), RoHS-compliant, with NiPdAu lead finish and MSL Level-1 rating. Pin 4 is GND; pins 1 and 8 form the Darlington switch collector-emitter path; pin 7 senses current-limit threshold; pin 5 is comparator inverting input for feedback.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Switch Collector | High-current Darlington collector node - connects to inductor in boost/buck or diode anode in inverting config. |
| 2 | Switch Emitter | Emitter output of internal Darlington - ties to GND in boost, to input in buck, or to output in inverting topology. |
| 3 | Timing Capacitor | Oscillator timing node - CT value directly sets switching frequency (f ≈ 1/(2.4·CT·Rdisch)). |
| 4 | GND | Power and signal reference ground - must be low-impedance star point for stability and noise immunity. |
| 5 | Comparator Inverting Input | Feedback node - connects to resistor divider from regulated output to set VOUT = 1.25·(1 + R2/R1). |
| 6 | VCC | Logic supply input - tied directly to input voltage rail (3–40 V); powers internal circuitry and driver stage. |
| 7 | Ipk Sense | Current-limit comparator input - monitors voltage across external sense resistor (RSC) to trigger shutdown at 300 mV. |
| 8 | Driver Collector | Darlington driver collector - used to drive external NPN transistor when >1.5-A peak current is required. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Set via external resistor divider on pin 5 - enables any positive or negative output from 1.25 V up to VIN ± 40 V depending on topology. |
| Short-circuit current limiting | Hardware-based cycle-by-cycle protection triggered at 300 mV on pin 7 - prevents thermal runaway during overload or fault conditions. |
| Low standby current | 4 mA max supply draw - minimizes battery drain in always-on portable instrumentation and remote sensors. |
| Wide operating temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments without derating. |
| External switch support | Pin 8 driver collector enables connection to external NPN transistor - extends peak current capability beyond 1.5 A for high-power boost/buck designs. |
Applications
| Portable Blood Gas Analyzers | Industrial HMIs |
|---|---|
Use Scenario: Battery-powered handheld analyzer requiring isolated ±12 V rails from single 4.5–6 V Li-ion source. IC Role / Device Role / Timing Role: MC33063ADRE4 configured as inverting regulator generates –12 V/100 mA output with 500 mVpp ripple; oscillator runs at ~33 kHz. Use Value: Single-chip solution eliminates need for dual-output transformer or second regulator IC, reducing BOM count and PCB area by 35%. | Use Scenario: Touchscreen HMI panel powered from 12 V vehicle bus needing stable 5 V/500 mA for MCU and display backlight. IC Role / Device Role / Timing Role: MC33063ADRE4 in buck configuration delivers 5 V/500 mA with 83.7% efficiency and 40 mVpp ripple using optional LC filter. Use Value: Internal 1.5-A switch handles full load without external FET, simplifying layout and enabling compact 2-layer board design. |
| Telecom Line-Powered Devices | Consumer Portable Audio |
Use Scenario: DSL modem requiring +28 V/175 mA bias supply derived from 12 V wall adapter with tight line regulation. IC Role / Device Role / Timing Role: MC33063ADRE4 in boost configuration achieves 28 V output with ±30 mV line regulation over 8–16 V input range. Use Value: Integrated oscillator and current-sense eliminate timing component mismatch issues common in discrete PWM controllers. | Use Scenario: Bluetooth speaker with single-cell Li-ion (3–4.2 V) needing regulated 3.3 V for audio codec and 5 V for USB charging port. IC Role / Device Role / Timing Role: MC33063ADRE4 used in dual-stage design: first stage boosts to 5 V, second stage bucks to 3.3 V using same IC family. Use Value: Shared reference and oscillator enable synchronized switching, reducing conducted EMI by 12 dB compared to dual independent controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063ADR | Same architecture but rated for 0°C to 70°C ambient; identical electrical specs and pinout. | Not suitable for extended-temperature industrial or automotive use cases requiring –40°C start-up. | Select MC34063ADR only for commercial-grade applications with controlled ambient environments. |
| LM2574HVSX-5.0/NOPB | Fixed 5-V output, 0.5-A switch, integrated compensation; no external timing cap or current-sense resistor needed. | Lacks adjustable output and topology flexibility - limited to buck-only operation with lower current capability. | Choose LM2574HVSX-5.0/NOPB when fixed 5-V buck conversion and minimal external parts outweigh need for configurability. |
Compared with MC33063ADRE4, MC34063ADR offers identical functionality at lower temperature grade, while LM2574HVSX-5.0/NOPB trades adjustability and topology freedom for simplified fixed-output buck implementation - making MC33063ADRE4 optimal for multi-rail, variable-output, or inverting designs requiring robust industrial qualification.
Availability
MC33063ADRE4 is available at Aetrix Electronics and suitable for portable medical devices, industrial HMIs, telecom power modules, and consumer audio systems requiring stable component supply across long production lifecycles.
Supply support for MC33063ADRE4 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
Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The MC33063A product line was designed specifically for cost-sensitive, medium-power DC-DC conversion in space-constrained applications where simplicity, reliability, and wide input range are critical - targeting portable instrumentation, legacy telecom, and industrial control subsystems.
FAQ
What topologies does the MC33063ADRE4 support?
The MC33063ADRE4 supports boost, buck, and inverting (buck-boost) DC-DC converter topologies using external inductors, diodes, and capacitors. Its internal Darlington switch and current-sense architecture allow direct implementation of all three configurations without additional ICs. Each topology requires specific external component connections detailed in TI's SLLS636N datasheet Figures 8–11. The MC33063ADRE4 does not support SEPIC or flyback topologies.
What is the maximum switching frequency achievable with MC33063ADRE4?
The MC33063ADRE4 oscillator operates from 24 kHz to 42 kHz (typical) when using a 1-nF timing capacitor at 5 V supply, per Electrical Characteristics Table 7.5. With optimized CT values and supply voltage, frequencies up to 100 kHz are specified in features but not guaranteed across temperature and process variation. For reliable operation, design targets should remain within the 24–42 kHz typical range documented in the datasheet.
How does the current-limit function work on MC33063ADRE4?
The MC33063ADRE4 implements cycle-by-cycle current limiting via the Ipk pin (pin 7). An external sense resistor (RSC) is placed between switch emitter (pin 2) and ground. When voltage across RSC reaches 300 mV (typical), the internal comparator triggers shutdown of the output switch for that cycle. This hardware-based protection prevents thermal damage during overload or short-circuit events and is independent of input voltage or temperature drift.
Can MC33063ADRE4 drive an external NPN transistor?
Yes, the MC33063ADRE4 can drive an external NPN transistor using its Driver Collector pin (pin 8). In non-Darlington configuration, pin 8 connects to the base of an external NPN, enabling peak currents beyond the internal 1.5-A limit. TI recommends forced β ≥10 and accounts for the 100-Ω internal emitter resistor. This capability is explicitly validated in Figure 7a and Section 9.1.1 of the SLLS636N datasheet for MC33063ADRE4.
What is the thermal resistance (θJA) of MC33063ADRE4 in SOIC-8 package?
The MC33063ADRE4 in SOIC-8 (D) package has a junction-to-ambient thermal resistance (θJA) of 97°C/W, as specified in Section 7.4 of the SLLS636N datasheet. This value assumes standard JEDEC High-K test board conditions. Actual thermal performance depends on PCB copper area, airflow, and nearby heat sources. For continuous 1.5-A switching operation, derating curves in the datasheet must be applied to ensure junction temperature remains below 150°C.
MC33063ADRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC33063ADRE4 FAQ
1.How can I place an order for MC33063ADRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063ADRE4 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 MC33063ADRE4 reliable?
The price and inventory of MC33063ADRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063ADRE4 is usually 5 days.
3.What payment methods are accepted for MC33063ADRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063ADRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063ADRE4?
MC33063ADRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063ADRE4 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 MC33063ADRE4?
For technical support, including MC33063ADRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063ADRE4 requirements.
6.How does Aetrix verify that MC33063ADRE4 is sourced from the original manufacturer or authorized distributors?
All MC33063ADRE4 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 MC33063ADRE4 meets industry standards.
7.What is the process for return or replacement of MC33063ADRE4?
All MC33063ADRE4 units undergo pre-shipment inspection (PSI). If there is an issue with MC33063ADRE4, 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 MC33063ADRE4 part is unused and in its original packaging.
Return procedure for MC33063ADRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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