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Texas Instruments MC34063ADRJR
- Part No.:
- MC34063ADRJR
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MC34063ADRJR.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,579
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Product details
Overview
MC34063ADRJR 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 output switch. It operates from 3 V to 40 V input and supports up to 100 kHz switching frequency - commonly used in portable device power supplies and industrial voltage conversion.
For engineers reviewing the MC34063ADRJR datasheet, MC34063ADRJR pinout, MC34063ADRJR application, or MC34063ADRJR equivalent, key selection considerations include its 8-pin SON (DRJ) package, –40°C to 70°C operating range, internal 1.25-V ±2% reference, 1.5-A peak switch current capability, and oscillator timing capacitor control of frequency.
Technical Context
The MC34063ADRJR implements a fixed-frequency, current-mode PWM architecture with an internal Darlington output switch and precision 1.25-V bandgap reference. Its oscillator uses external CT to set frequency between ~24 kHz and 100 kHz, while Ipk sense pin enables adjustable current limiting at 250–350 mV threshold.
It supports three standard converter configurations without external gate drivers: step-up (boost), step-down (buck), and polarity-inverting (flyback-derived). The device's comparator compares feedback voltage against the internal reference, and the PWM controller modulates switch duty cycle to regulate output voltage across varying load and line conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 40 V - supports wide-range unregulated inputs including automotive battery, industrial rails, and multi-cell battery packs. |
| Output Switch Current | Up to 1.5 A peak - enables direct drive of external inductors in sub-10-W DC-DC converters without external MOSFETs. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback node for precise output regulation across temperature and supply variations. |
| Oscillator Frequency | Up to 100 kHz - set by external timing capacitor; higher frequencies reduce inductor size but increase switching losses. |
| Current Limit Threshold | 250–350 mV at Ipk pin - allows programmable overcurrent protection via series sense resistor without additional components. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments, not extended automotive grade. |
| Supply Current (ICC) | ≤4 mA - low quiescent consumption supports battery-powered applications during light-load or standby operation. |
Pinout & Package
The MC34063ADRJR is housed in an 8-pin SON (DRJ) package measuring 4.00 mm × 4.00 mm with exposed thermal pad electrically bonded to Pin 4 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Collector) | High-current switch collector output | Connects to inductor/diode node in boost/buck/inverting topologies; handles full switch current path. |
| 2 (Switch Emitter) | High-current switch emitter output | Serves as return path for switch current; tied to GND or input rail depending on topology. |
| 3 (Timing Capacitor) | Oscillator timing node | External capacitor sets switching frequency; value inversely proportional to fosc (e.g., 1 nF ≈ 33 kHz). |
| 4 (GND) | Power and signal ground reference | Common return for internal circuits, thermal pad, and external feedback/sense networks. |
| 5 (Comparator Inverting Input) | Feedback voltage input | Accepts resistor-divider voltage from output; compared to 1.25-V reference to regulate output. |
| 6 (VCC) | Logic supply input | Connected directly to input voltage rail; powers internal circuitry and must be ≥3 V. |
| 7 (Ipk Sense) | Current-limit sense input | Monitors voltage drop across external sense resistor; triggers shutdown when ≥250 mV. |
| 8 (Driver Collector) | Internal driver transistor collector | Used in non-Darlington configurations to drive external NPN/PNP transistors for higher peak current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25-V reference | ±2% accuracy over temperature ensures stable output regulation without external voltage references. |
| Adjustable output voltage | Set via external resistor divider on Pin 5 - supports any output >1.25 V in boost/buck, or <0 V in inverting mode. |
| Short-circuit current limiting | Programmable via Ipk pin resistor - protects switch and external components during overload or fault conditions. |
| Low standby current | ≤4 mA ICC enables efficient operation in battery-backed systems where quiescent power matters. |
| Multi-topology support | Single IC configures as boost, buck, or inverting regulator - reduces BOM count and design complexity. |
Applications
| Portable Medical Devices | Industrial HMIs |
|---|---|
Use Scenario: Powering LCD bias, sensor interfaces, and microcontroller peripherals in handheld blood gas analyzers. IC Role / Device Role / Timing Role: MC34063ADRJR acts as a compact, self-contained DC-DC controller generating regulated ±12 V or 5 V from a single 4.5–6 V Li-ion cell. Use Value: Eliminates need for external gate drivers or precision references, reducing PCB area and component count in space-constrained enclosures. | Use Scenario: Providing isolated auxiliary rails for touch-screen controllers and CAN transceivers in factory-floor HMIs. IC Role / Device Role / Timing Role: MC34063ADRJR implements a buck converter delivering 3.3 V/500 mA from a 24-V industrial bus, with built-in current limiting for short-circuit resilience. Use Value: Delivers 83.7% efficiency at full load and maintains ≤12 mV line regulation across 15–25 V input variation - critical for stable display and communication operation. |
| Telecom Power Modules | Consumer Audio Supplies |
Use Scenario: Generating negative bias voltages for op-amp front-ends and analog signal conditioning in cable modem power supplies. IC Role / Device Role / Timing Role: MC34063ADRJR configured as an inverting regulator produces –12 V/100 mA from a 5-V rail, with optional LC filter reducing ripple to 70 mVPP. Use Value: Achieves 62.2% efficiency and ±0.12% load regulation - sufficient for low-noise analog stages without requiring LDO post-regulation. | Use Scenario: Supplying dual-rail ±15 V for headphone amplifiers and DACs in portable audio docks. IC Role / Device Role / Timing Role: MC34063ADRJR operates in dual inverting configuration to generate symmetrical outputs from a single 12-V input. Use Value: Leverages internal 1.25-V reference and resistor-divider feedback to maintain tight output matching (<0.5% error), minimizing distortion in balanced audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33063ADRJR | Wider temperature range (–40°C to 85°C); otherwise identical electrical specs and pinout. | Suitable for automotive or extended-temperature industrial use where MC34063ADRJR's 0°C lower limit is insufficient. | Select MC33063ADRJR when operation below 0°C is required; same layout and bill-of-materials apply. |
| LM2574N-5.0 | Fixed 5-V output, no external feedback; 0.5-A switch current; requires external diode and inductor. | Limited to fixed-output step-down only; lacks boost/inverting capability and adjustable current limit. | Choose LM2574N-5.0 only for simple 5-V buck applications where cost and minimal external parts outweigh flexibility needs. |
Compared with MC33063ADRJR and LM2574N-5.0, the MC34063ADRJR offers topology flexibility and programmable current limiting within its commercial temperature window, making it optimal for multi-rail, variable-output designs where thermal margin is adequate.
Availability
MC34063ADRJR is available at Aetrix Electronics and suitable for portable medical devices, industrial HMIs, telecom power modules, and consumer audio supplies requiring stable component supply and long-term sourcing continuity.
Supply support for MC34063ADRJR 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 delivering analog and embedded processing solutions, with deep expertise in power management ICs and industrial-grade reliability.
The MC34063A product line was engineered for cost-sensitive, medium-power DC-DC conversion in commercial applications - emphasizing minimal external parts, topology versatility, and robust current-mode control.
FAQ
What is the maximum switching frequency achievable with MC34063ADRJR?
The MC34063ADRJR supports oscillator frequencies up to 100 kHz, determined by the external timing capacitor (CT) value and internal charge/discharge currents. At 25°C with CT = 1 nF, typical frequency is 33 kHz; smaller CT values increase frequency, but practical limits arise from switch transition times and layout parasitics. Exceeding 100 kHz risks reduced efficiency and instability due to internal propagation delays.
Does MC34063ADRJR require an external MOSFET for operation?
No, the MC34063ADRJR integrates a bipolar Darlington output switch rated for up to 1.5 A peak current, eliminating the need for an external MOSFET in most ≤10-W applications. External transistors are only required when peak current exceeds 1.5 A - in which case Pin 8 (Driver Collector) drives an external NPN/PNP, as detailed in TI's Application Report SLLA197.
Can MC34063ADRJR be used in a step-down (buck) configuration?
Yes, the MC34063ADRJR supports buck topology using the standard configuration shown in Figure 11 of the datasheet (SLLS636N). With VIN = 25 V, it delivers 5 V/500 mA at 83.7% efficiency and maintains ≤3 mV load regulation. The internal 1.25-V reference and feedback divider on Pin 5 enable precise output setting independent of input variation.
What is the function of the Ipk pin (Pin 7) on MC34063ADRJR?
The Ipk pin (Pin 7) on MC34063ADRJR senses voltage across an external current-sense resistor placed in series with the switch emitter (Pin 2). When this voltage reaches 250–350 mV, the internal current-limit circuit activates, reducing duty cycle to protect the switch and external components. This enables programmable overcurrent protection without additional ICs or comparators.
Is MC34063ADRJR pin-compatible with MC33063ADRJR?
Yes, MC34063ADRJR and MC33063ADRJR share identical 8-pin SON (DRJ) package dimensions, pinout, and electrical functionality. The only difference is operating temperature range: MC34063ADRJR is rated for 0°C to 70°C, while MC33063ADRJR extends to –40°C to 85°C. Layout and schematics are fully interchangeable; only thermal validation differs for sub-zero environments.
MC34063ADRJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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):
- 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-SON (4x4)
MC34063ADRJR FAQ
1.How can I place an order for MC34063ADRJR through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ADRJR 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 MC34063ADRJR reliable?
The price and inventory of MC34063ADRJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ADRJR is usually 5 days.
3.What payment methods are accepted for MC34063ADRJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ADRJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ADRJR?
MC34063ADRJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ADRJR 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 MC34063ADRJR?
For technical support, including MC34063ADRJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ADRJR requirements.
6.How does Aetrix verify that MC34063ADRJR is sourced from the original manufacturer or authorized distributors?
All MC34063ADRJR 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 MC34063ADRJR meets industry standards.
7.What is the process for return or replacement of MC34063ADRJR?
All MC34063ADRJR units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ADRJR, 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 MC34063ADRJR part is unused and in its original packaging.
Return procedure for MC34063ADRJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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