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Texas Instruments MC34063AD
- Part No.:
- MC34063AD
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063AD.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,157
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Product details
Overview
MC34063AD from Texas Instruments is a monolithic DC-DC switching regulator controller IC designed for boost, buck, and inverting topologies. It integrates a temperature-compensated 1.25-V reference, comparator, oscillator, PWM controller with active current limiting, driver, and 1.5-A high-current switch. Key confirmed specs: 3 V to 40 V input range, 1.5 A peak switch current, 100 kHz max oscillator frequency, ±2% reference accuracy, and 0°C to 70°C operating temperature range - used in portable device power supplies and industrial voltage conversion.
For engineers reviewing the MC34063AD datasheet, MC34063AD pinout, MC34063AD application, or MC34063AD equivalent, this page delivers verified functional architecture, SOIC-8 package pin mapping, real-world efficiency data (e.g., 87.7% in step-up at 12 V/175 mA), thermal resistance (97°C/W), and validated alternative parts with documented differences in temperature grade and current capability.
Technical Context
The MC34063AD implements a fixed-frequency, current-mode PWM control architecture with internal Darlington output switch and external timing capacitor (CT)–controlled oscillator. Its comparator compares feedback voltage against a precision 1.25-V reference, while the IPK pin enables adjustable current limiting via external sense resistor.
It supports three standard converter configurations without external gate drivers: boost (output > input), buck (output < input), and inverting (negative output). The device operates in discontinuous conduction mode by default and requires no compensation network due to its built-in oscillator and current-sense loop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 40 V - supports wide-range unregulated inputs including automotive battery (12 V), industrial rails (24 V), and USB-powered systems (5 V). |
| Switch Current Rating | 1.5 A peak - enables direct drive of power inductors up to ~500 mA output in buck mode with margin for transient loads. |
| Oscillator Frequency | Up to 100 kHz - set by external CT capacitor; typical 33 kHz at 1 nF; higher frequencies reduce inductor size but increase switching losses. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback threshold for precise output regulation across temperature and line variations. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for indoor consumer, telecom, and HMI applications, not extended industrial or automotive. |
| Supply Current (ICC) | 4 mA max - low quiescent consumption enables efficient operation in battery-backed or standby-power-sensitive designs. |
| Current Limit Threshold | 300 mV typ at IPK pin - sets switch current limit via RSC = 0.3 V / ISW(LIMIT); enables overcurrent protection without external sensing ICs. |
Pinout & Package
MC34063AD is packaged 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; pin 6 is VCC (tied to input); pins 1 and 8 form the Darlington switch collector/driver collector path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Collector) | High-current switch collector output | Connects to inductor in boost/buck or diode anode in inverting; handles full switch current up to 1.5 A. |
| 2 (Switch Emitter) | Switch emitter return | Returned to GND in standard configurations; forms emitter-follower path in non-Darlington mode. |
| 3 (Timing Capacitor) | Oscillator timing node | CT capacitor value directly sets switching frequency; 1 nF yields ~33 kHz; smaller values increase frequency. |
| 4 (GND) | Analog and power ground reference | Common return for reference, comparator, oscillator, and switch; must be low-impedance for stability. |
| 5 (Comparator Inverting Input) | Feedback voltage input | Connected to resistor divider from output; compared against 1.25 V reference to regulate output voltage. |
| 6 (VCC) | Logic supply input | Tied directly to input voltage rail; powers internal circuitry; must be ≥3 V and ≤40 V. |
| 7 (IPK) | Current-limit sense input | Monitors voltage drop across external RSC; triggers shutdown when ≥300 mV to protect switch and inductor. |
| 8 (Driver Collector) | Darlington driver collector | Drives external NPN transistor in high-current configurations; enables >1.5 A peak output with external switch. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25-V reference | ±2% accuracy over 0°C–70°C ensures stable output regulation without external voltage references. |
| Adjustable output voltage | Set via two-resistor feedback divider on pin 5 - supports any positive or negative output from 1.25 V upward. |
| Short-circuit current limiting | Active IPK-based foldback protects switch and inductor during overload or output short conditions. |
| Low standby current | 4 mA max ICC allows use in always-on systems where power budget is constrained (e.g., remote sensors). |
| Multi-topology support | Native boost, buck, and inverting configurations - eliminates need for separate ICs or complex controller design. |
Applications
| Portable Medical Devices | Industrial HMIs |
|---|---|
|
Use Scenario: Powering LCD bias and sensor rails in handheld blood gas analyzers with single-cell Li-ion (3.0–4.2 V) input. IC Role / Device Role / Timing Role: Buck converter generating stable +3.3 V and inverting converter delivering –5 V for display contrast control. Use Value: Single IC replaces dual regulators; 83.7% efficiency at 25 V/500 mA reduces thermal load in sealed enclosures. |
Use Scenario: Generating isolated auxiliary voltages in factory-floor human-machine interface panels powered from 24 V DC bus. IC Role / Device Role / Timing Role: Boost converter stepping 24 V to 28 V/175 mA for backlight drivers and logic rails. Use Value: 87.7% efficiency minimizes heat buildup near touchscreens; SOIC-8 footprint simplifies layout in space-constrained PCBs. |
| Telecom Power Modules | Consumer Audio Accessories |
|
Use Scenario: Providing regulated –12 V/100 mA rail for op-amp biasing in DSL line card analog front-ends. IC Role / Device Role / Timing Role: Inverting converter converting 4.5–6.0 V input to negative output using 1.0 mH inductor and 1N5819 Schottky. Use Value: 62.2% efficiency acceptable for low-power analog stages; 500 mVPP ripple reduced to 70 mVPP with optional LC filter. |
Use Scenario: Supplying clean ±5 V rails for headphone amplifier ICs in USB-C powered DAC/headphone amps. IC Role / Device Role / Timing Role: Dual-regulator implementation: buck for +5 V, inverting for –5 V, sharing common CT and feedback components. Use Value: Eliminates need for dual-output transformer or charge-pump IC; ±2% reference ensures matched rail symmetry critical for THD performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33063AD | Wider temperature range (–40°C to 85°C); identical electrical specs and pinout. | Suitable for automotive under-hood, outdoor industrial, or extended-temperature embedded systems. | Select MC33063AD when operating ambient exceeds 70°C or cold-start reliability below 0°C is required. |
| LM2574N-5.0 | Fixed 5.0 V output; 0.5 A switch current; integrated error amplifier; no external timing cap needed. | Lower component count for fixed-output applications; unsuitable for adjustable or inverting topologies. | Choose LM2574N-5.0 only for simple 5 V buck conversion where adjustability, inversion, or >0.5 A load is not needed. |
Compared with MC34063AD, MC33063AD offers extended thermal robustness without layout or BOM changes, while LM2574N-5.0 trades topology flexibility for integration and lower cost in fixed-voltage use cases - making MC34063AD optimal for multi-rail, variable-output, or cost-sensitive designs requiring one IC per function.
Availability
MC34063AD is available at Aetrix Electronics and suitable for portable medical devices, industrial HMIs, telecom power modules, and consumer audio accessories requiring stable component supply and long-term manufacturability.
Supply support for MC34063AD 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in power conversion ICs.
The MC34063A product line was engineered for cost-sensitive, discrete-component-based DC-DC conversion in commercial-grade applications - emphasizing minimal external parts, topology flexibility, and ease of use for analog power design.
FAQ
What is the maximum switching frequency of the MC34063AD?
The MC34063AD oscillator supports up to 100 kHz, set by the external timing capacitor (CT) on pin 3. At 1 nF, typical frequency is 33 kHz; reducing CT to 220 pF raises frequency to ~100 kHz. Higher frequencies allow smaller inductors but increase switching losses and require careful layout to maintain efficiency and EMI compliance in the MC34063AD design.
Can the MC34063AD be used in an inverting configuration?
Yes, the MC34063AD supports inverting topology out-of-the-box - shown in Figure 8 of the datasheet. With proper external component selection (inductor, diode, timing cap, and feedback resistors), it generates stable negative outputs such as –12 V/100 mA from a 4.5–6.0 V input. The MC34063AD's internal switch and current-sense architecture make this configuration fully self-contained without additional controllers.
What is the purpose of the IPK pin on the MC34063AD?
The IPK pin (pin 7) on the MC34063AD senses voltage across an external current-sense resistor (RSC) to implement programmable peak current limiting. When voltage at IPK reaches ~300 mV, the internal PWM shuts off the switch to prevent overcurrent. This protects both the MC34063AD and external magnetics - a key safety feature absent in many basic switching controllers.
Does the MC34063AD require an external diode in boost mode?
Yes, the MC34063AD requires an external Schottky diode (e.g., 1N5819) in boost configuration to steer inductor energy to the output capacitor during switch-off periods. The internal switch handles only the high-side switching path; the diode completes the current loop. Using a low-VF Schottky minimizes conduction loss and improves efficiency - a necessary design element explicitly specified in all MC34063AD boost reference schematics.
How does the MC34063AD's 1.25-V reference affect output voltage accuracy?
The MC34063AD's internal 1.25-V reference has ±2% tolerance over 0°C–70°C, directly propagating to output voltage error in feedback-divider-based designs. For example, a 12 V output set by R1/R2 has ±2% baseline error before considering resistor tolerance or layout effects. This makes the MC34063AD suitable for non-critical rails but less ideal for precision analog supplies where tighter regulation is mandatory.
MC34063AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063AD FAQ
1.How can I place an order for MC34063AD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063AD 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 MC34063AD reliable?
The price and inventory of MC34063AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063AD is usually 5 days.
3.What payment methods are accepted for MC34063AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063AD?
MC34063AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063AD 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 MC34063AD?
For technical support, including MC34063AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063AD requirements.
6.How does Aetrix verify that MC34063AD is sourced from the original manufacturer or authorized distributors?
All MC34063AD 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 MC34063AD meets industry standards.
7.What is the process for return or replacement of MC34063AD?
All MC34063AD units undergo pre-shipment inspection (PSI). If there is an issue with MC34063AD, 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 MC34063AD part is unused and in its original packaging.
Return procedure for MC34063AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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