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Texas Instruments MC34063AP
- Part No.:
- MC34063AP
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC34063AP.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,324
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Product details
Overview
MC34063AP 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. Key confirmed parameters: 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. It enables compact, low-component-count power supplies in portable instrumentation and industrial control.
For engineers reviewing the MC34063AP datasheet, MC34063AP pinout, MC34063AP application, or MC34063AP equivalent, this page delivers verified functional specifications, validated pin functions, topology-specific design constraints, and real-world performance data from TI's SLLS636N datasheet - including measured efficiency (83.7%–87.7%), load regulation (3 mV–12 mV), and ripple suppression with optional filtering.
Technical Context
The MC34063AP implements a fixed-frequency, current-mode PWM architecture with internal oscillator charge/discharge currents (24–42 μA / 140–260 μA) setting timing via external capacitor CT. Its Darlington-connected output switch delivers 1.5 A peak current with saturation voltage ≤1.3 V at 1 A, while non-Darlington operation requires forced β ≥10 to avoid saturation recovery delay above 30 kHz.
Control logic relies on a precision 1.25-V reference (±2%) compared against feedback from a resistor divider at Pin 5; current limiting triggers when IPk sense voltage reaches 250–350 mV at Pin 7. The device supports three fundamental configurations: step-up (boost), step-down (buck), and polarity-inverting - each requiring distinct external component placement but sharing identical internal signal flow and timing behavior.
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 | Up to 1.5 A peak - enables direct drive of power inductors in sub-20 W converters without external transistors. |
| Oscillator Frequency | Up to 100 kHz - set by external timing capacitor; typical 33 kHz at 1 nF, enabling EMI control and inductor size optimization. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback threshold for accurate output voltage regulation across temperature and line variations. |
| Current Limit Threshold | 250–350 mV at Pin 7 - sets precise overcurrent protection point independent of supply voltage or temperature drift. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments, excluding extended automotive or military ranges. |
| Supply Current (Standby) | ≤4 mA - ensures low quiescent power draw during light-load or idle conditions, critical for battery-powered devices. |
Pinout & Package
MC34063AP uses an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 6.35 mm body size and through-hole mounting. Pin numbering follows standard DIP convention (Pin 1 = bottom-left corner, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Collector) | High-current switch collector node | Connects to inductor/diode junction in boost/inverting; carries full switched current - requires thick PCB trace routing. |
| 2 (Switch Emitter) | High-current switch emitter output | Return path for switch current; tied to GND in buck configuration; forms emitter-follower stage in non-Darlington mode. |
| 3 (Timing Capacitor) | Oscillator timing node | External capacitor (CT) sets switching frequency; value directly determines tON/tOFF ratio and ripple characteristics. |
| 4 (GND) | Analog and power ground reference | Common return for reference, comparator, oscillator, and switch; must be low-impedance and separated from noisy power paths. |
| 5 (Comparator Inverting Input) | Feedback voltage input | Accepts resistor-divider voltage from output; comparison against 1.25 V reference sets regulation error signal. |
| 6 (VCC) | Logic supply input | Tied directly to input voltage rail; powers internal circuitry; requires ≥1000 µF decoupling per TI layout guidelines. |
| 7 (Ipk Sense) | Current-limit sense input | Monitors voltage drop across external sense resistor (RSC) to trigger foldback or shutdown at preset current threshold. |
| 8 (Driver Collector) | Internal driver transistor collector | Used in external-switch configurations; drives base/gate of external NPN/PNP transistors for >1.5 A peak applications. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25-V reference | ±2% initial accuracy and <5 mV line regulation enable stable output voltage across 3–40 V input range. |
| Active current limiting | Hardware-based IPk sense at Pin 7 provides immediate foldback response without software or external comparators. |
| Dual switch configurations | Supports both Darlington (low-speed, robust) and non-Darlington (high-speed, β-dependent) modes for topology flexibility. |
| Low standby current | ≤4 mA supply current allows efficient operation in sleep or standby states of portable equipment. |
| Three-converter topology support | Single IC implements boost, buck, and inverting functions using only diodes, resistors, capacitors, and inductors - no redesign needed. |
Applications
| Portable Medical Instrumentation | Industrial Human-Machine Interface (HMI) |
|---|---|
|
Use Scenario: Powering LCD bias rails and sensor front-ends in handheld blood gas analyzers with 4.5–6 V battery input. IC Role / Device Role / Timing Role: Inverting regulator generating –12 V/100 mA from 5 V; uses internal 1.25-V reference and 33 kHz switching for low EMI. Use Value: Achieves 62.2% efficiency and 70 mVPP ripple with optional filter - meets portable device battery life and display noise requirements. |
Use Scenario: Generating isolated 5 V and –5 V rails for touch-screen controllers and CAN transceivers in factory-floor HMIs. IC Role / Device Role / Timing Role: Dual-output configuration using one MC34063AP for buck (5 V) and another for inverting (–5 V); synchronized via shared CT. Use Value: Eliminates need for dual ICs or transformers; maintains <12 mV load regulation across 50–500 mA output swing. |
| Telecom Line-Powered Equipment | Consumer Audio Power Supplies |
|
Use Scenario: Step-down conversion from 24 V PoE-derived input to 5 V for Ethernet PHY and microcontroller in cable modems. IC Role / Device Role / Timing Role: Buck regulator operating at 100 kHz with 220 µH inductor; leverages 1.5 A switch to handle transient surges. Use Value: Delivers 83.7% efficiency and 40 mVPP filtered ripple at 500 mA - satisfies telecom thermal and noise specs without heatsinking. |
Use Scenario: Boosting 12 V wall adapter output to 28 V for Class AB headphone amplifiers in portable DACs. IC Role / Device Role / Timing Role: Boost converter with 170 µH inductor and 1N5819 Schottky; configured for 28 V/175 mA output. Use Value: Achieves 87.7% efficiency and 40 mVPP ripple - enables clean analog audio performance without LDO post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33063AP | Wider temperature range (–40°C to 85°C); otherwise identical electrical specs and pinout. | Suitable for automotive or outdoor industrial use where ambient exceeds 70°C. | Select MC33063AP when extended temperature operation is required; MC34063AP remains optimal for commercial-grade designs. |
| LM2574N-5.0 | Fixed 5 V output, higher integration (internal switch, oscillator, feedback), but lower 0.5 A current limit and no inverting capability. | Limited to step-down only; cannot replace MC34063AP in boost or inverting topologies. | Choose LM2574N-5.0 only for simple 5 V buck applications where external component count reduction outweighs topology flexibility loss. |
Compared with MC33063AP and LM2574N-5.0, the MC34063AP offers unique topology versatility (boost/buck/invert) within its 0°C–70°C range, while retaining full pin compatibility with MC33063AP - making it the preferred choice for cost-sensitive, multi-rail commercial power designs requiring design reuse.
Availability
MC34063AP is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial HMI systems, and telecom line-powered equipment requiring stable component supply and long-term manufacturability.
Supply support for MC34063AP 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 and embedded processing technologies, with decades of expertise in power management ICs and industrial-grade reliability.
The MC34063A product line was designed specifically for low-cost, discrete-component-based DC-DC conversion in commercial applications - emphasizing minimal external parts, wide input range, and topology flexibility without sacrificing regulation accuracy.
FAQ
What topologies does the MC34063AP support?
The MC34063AP supports three fundamental DC-DC converter topologies: step-up (boost), step-down (buck), and polarity-inverting. Each configuration uses the same internal switch, reference, and oscillator but requires different external component arrangements - documented in Figures 8–11 of the TI SLLS636N datasheet. The MC34063AP does not support SEPIC or flyback topologies without additional external components.
What is the maximum achievable switching frequency for MC34063AP?
The MC34063AP oscillator operates up to 100 kHz, as confirmed in Section 7.5 of the TI SLLS636N datasheet. At 25°C with CT = 1 nF, typical frequency is 33 kHz (range 24–42 kHz). Higher frequencies require smaller CT values but reduce minimum off-time margin and increase sensitivity to layout parasitics - TI recommends staying below 100 kHz for reliable operation.
Can MC34063AP drive external MOSFETs or transistors?
Yes - Pin 8 (Driver Collector) enables external switch control. When used with an external NPN transistor (e.g., in Figure 7a), the MC34063AP drives the base via Pin 8, allowing peak currents beyond 1.5 A. However, the internal Darlington switch must be disabled by disconnecting Pins 1 and 2 from the external transistor's collector/emitter to prevent contention.
How does the current limit function work on MC34063AP?
The MC34063AP implements current limiting by monitoring voltage across an external sense resistor (RSC) connected to Pin 7 (Ipk Sense). When this voltage reaches 250–350 mV - corresponding to the programmed current threshold - the PWM controller reduces duty cycle or shuts down the switch. This is a hardware-based, cycle-by-cycle protection mechanism independent of feedback loop dynamics.
Is MC34063AP RoHS compliant?
Yes - the MC34063AP is RoHS compliant, as confirmed in TI's PACKAGE OPTION ADDENDUM (April 2026), which lists "Yes" under RoHS for all PDIP variants including MC34063AP, MC34063AP.A, and MC34063APE4. Lead finish is NiPdAu (NIPDAU), and the package carries no MSL rating due to through-hole construction.
MC34063AP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MC34063AP FAQ
1.How can I place an order for MC34063AP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063AP 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 MC34063AP reliable?
The price and inventory of MC34063AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063AP is usually 5 days.
3.What payment methods are accepted for MC34063AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063AP?
MC34063AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063AP 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 MC34063AP?
For technical support, including MC34063AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063AP requirements.
6.How does Aetrix verify that MC34063AP is sourced from the original manufacturer or authorized distributors?
All MC34063AP 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 MC34063AP meets industry standards.
7.What is the process for return or replacement of MC34063AP?
All MC34063AP units undergo pre-shipment inspection (PSI). If there is an issue with MC34063AP, 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 MC34063AP part is unused and in its original packaging.
Return procedure for MC34063AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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