My Inquiry
My Account
onsemi MC34063ADG
- Part No.:
- MC34063ADG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063ADG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC34063ADG from onsemi is a monolithic DC-DC converter controller IC designed for step-down (buck), step-up (boost), and voltage-inverting topologies. It integrates a temperature-compensated 1.25 V reference, comparator, oscillator with active current limiting, driver, and 1.5 A Darlington output switch. Operates from 3.0 V to 40 V input, supports up to 100 kHz switching frequency, and delivers precision 2% reference voltage - used in industrial power supplies, battery-powered instrumentation, and embedded DC rail generation.
For engineers reviewing the MC34063ADG datasheet, pinout, applications, or equivalent options, key selection criteria include its internal 1.5 A switch capability, adjustable output voltage via external resistor divider, low standby current, and SOIC-8 package compatibility with legacy board layouts requiring minimal external components.
Technical Context
The MC34063ADG implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by an external capacitor (CT) and discharge/charge current ratio. Its Darlington output stage enables robust 1.5 A peak switch current with typical VCE(sat) of 1.0 V at 1.0 A, while the 1.25 V reference feeds a high-impedance comparator input for precise feedback regulation.
It supports three fundamental topologies without external switch modification: buck (step-down), boost (step-up), and inverting (negative output). The IPk sense pin monitors switch current via an external resistor, enabling cycle-by-cycle current limiting at 300 mV threshold - critical for stable operation under transient load or short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Switch Current | 1.5 A peak - enables direct drive of medium-power converters without external MOSFETs in many applications. |
| Oscillator Frequency | Up to 100 kHz - balances efficiency and component size; timing set by CT capacitor value and internal charge/discharge currents. |
| Reference Voltage | 1.25 V ±2% - provides stable feedback point for accurate output voltage setting via R1/R2 divider. |
| Current Limit Threshold | 300 mV (typ.) at IPk sense pin - sets overcurrent protection level with 0.3 Ω sense resistor yielding 1 A limit. |
| Supply Current (Standby) | ≤4.0 mA - ensures low quiescent power in battery-operated systems during light-load or sleep modes. |
| Operating Temperature | 0°C to +70°C - rated for commercial/industrial ambient environments, not extended automotive grade. |
Pinout & Package
MC34063ADG is housed in an 8-pin SOIC-8 (Case 751-07) package with standard 1.27 mm pitch, compatible with automated assembly and legacy PCB footprints. Thermal resistance RJA = 160°C/W enables moderate power dissipation at ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Switch Collector | High-current NPN collector output | Connects to inductor/diode node in boost/inverting; to ground in buck; handles full switch current. |
| 2 - Switch Emitter | Emitting terminal of internal Darlington | Serves as return path for switch current; tied to GND in buck, to input in boost/inverting. |
| 3 - Timing Capacitor | Oscillator timing node | External CT capacitor sets oscillator frequency via internal charge/discharge current ratio. |
| 4 - GND | Power and signal reference ground | Common return for internal circuits, feedback network, and external power components. |
| 5 - Comparator Inverting Input | Feedback voltage sensing input | Monitors divided output voltage; compared against 1.25 V reference to regulate output. |
| 6 - IPk Sense | Current limit detection input | Voltage across external sense resistor fed here; trip occurs at ~300 mV for overcurrent protection. |
| 7 - Driver Collector | Internal driver transistor collector | Can drive external NPN/PNP transistors for higher current capability beyond 1.5 A. |
| 8 - VCC | Positive supply input | Accepts 3.0–40 V input; powers internal circuitry and bias networks; decoupling required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Darlington switch | Eliminates need for external power transistor in ≤1.5 A applications, reducing BOM count and layout complexity. |
| Adjustable output voltage | Set via two-resistor feedback divider referenced to 1.25 V - supports buck, boost, and inverting configurations. |
| Current-limiting protection | Programmable via external sense resistor at Pin 6 - provides reliable short-circuit and overload protection. |
| Wide input voltage range | 3.0 V to 40 V operation accommodates 5 V logic rails, 12 V/24 V industrial buses, and unregulated battery inputs. |
| Low standby supply current | ≤4.0 mA typical - extends battery life in portable equipment and enables efficient light-load performance. |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Generating isolated or non-isolated ±5 V, ±12 V, or 3.3 V rails from 9 V or 12 V battery packs in handheld test equipment. IC Role / Device Role / Timing Role: Primary DC-DC controller managing switch timing, current sensing, and voltage regulation in boost or inverting topology. Use Value: Enables compact, low-component-count power design with 62–87% measured efficiency across 100–500 mA loads. |
Use Scenario: Stepping up single-cell Li-ion (3.0–4.2 V) or alkaline (0.9–1.5 V/cell) battery voltage to stable 5 V for microcontroller and sensor subsystems. IC Role / Device Role / Timing Role: Boost converter controller regulating output using internal 1.25 V reference and external R1/R2 feedback network. Use Value: Delivers regulated 5 V at up to 175 mA from 3.6 V input with <±0.05% line regulation and 400 mVpp ripple (unfiltered). |
| Embedded System Rail Generation | Legacy Equipment Voltage Conversion |
|
Use Scenario: Creating auxiliary 3.3 V or 5 V supply from existing 12 V or 24 V board-level bus in PLC modules or motor controllers. IC Role / Device Role / Timing Role: Buck regulator controller driving external inductor/diode to reduce voltage with minimal external parts. Use Value: Achieves 83.7% efficiency at 500 mA output with ±0.12% line regulation and 40 mVpp ripple when filtered. |
Use Scenario: Replacing obsolete discrete transistor-based DC-DC converters in aging industrial control panels or telecom line cards. IC Role / Device Role / Timing Role: Drop-in monolithic replacement for multi-component switch-mode designs, retaining same SOIC-8 footprint. Use Value: Reduces component count by >50%, improves reliability, and maintains compatibility with existing PCB layouts and thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063ADR2G | Same die, tape-and-reel packaging (2500 pcs), identical electrical specs and SOIC-8 footprint. | No functional difference; selected for high-volume automated assembly instead of rail packaging. | Choose MC34063ADR2G for SMT production runs requiring reel-fed placement. |
| LM2574N-5.0 | Fixed 5.0 V output, 0.5 A internal switch, 52 kHz fixed frequency, no IPk sense pin or adjustable topology support. | Limited to step-down only; lacks boost/inverting capability and programmable current limit. | Choose LM2574N-5.0 only for simple 5 V buck conversion where adjustability and topology flexibility are unnecessary. |
Compared with MC34063ADG, MC34063ADR2G offers identical performance in tape-and-reel format for volume manufacturing, while LM2574N-5.0 trades configurability and current capability for simplicity and fixed-output convenience - making MC34063ADG the preferred choice for multi-topology, adjustable, or >0.5 A designs.
Availability
MC34063ADG is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, and embedded system rail generation requiring stable component supply and long-term obsolescence management.
Supply support for MC34063ADG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC34063A series was engineered as a cost-optimized, general-purpose DC-DC controller family targeting applications where design simplicity, wide input range, and multi-topology flexibility outweigh the need for modern synchronous rectification or integrated MOSFETs.
FAQ
What topologies does the MC34063ADG support?
The MC34063ADG supports buck (step-down), boost (step-up), and voltage-inverting configurations using the same IC and minimal external components. Its internal Darlington switch, oscillator, and feedback comparator enable all three without redesign - demonstrated in Figures 9 (boost), 11 (buck), and 13 (inverting) of the official datasheet. Each topology requires specific external component connections but shares identical MC34063ADG pin assignments and control logic.
What is the maximum output current achievable with the MC34063ADG?
The MC34063ADG features an internal Darlington switch rated for 1.5 A peak current. Practical continuous output current depends on topology, input/output voltage, thermal management, and external component selection - typically 100–500 mA in well-designed boost/buck circuits. For higher currents, Figure 10 and 12 in the datasheet show how to use Pin 7 (Driver Collector) to drive external transistors, extending capability beyond the internal switch limit.
How is output voltage adjusted on the MC34063ADG?
Output voltage is adjusted using a resistive divider (R1 and R2) connected between output, feedback pin (Pin 5), and ground. The internal 1.25 V reference is compared against the divided voltage, so VOUT = 1.25 V × (1 + R2/R1). This method works identically across buck, boost, and inverting topologies - confirmed in design equations in Figure 17 and application examples in Figures 9, 11, and 13 of the MC34063ADG datasheet.
Does the MC34063ADG require an external timing resistor?
No, the MC34063ADG uses only an external timing capacitor (CT) connected to Pin 3 - no timing resistor is needed. Oscillator frequency is determined by CT value and internal constant-current sources (ICHG ≈ 35 µA, IDISCHG ≈ 220 µA), as specified in the Electrical Characteristics table on page 3. Frequency vs. CT curves are provided in Figure 3, and design formulas appear in Figure 17.
Is the MC34063ADG pin-compatible with other variants like MC33063A or NCV33063A?
Yes - MC34063ADG, MC33063ADG, and NCV33063AVDR2G share identical pinout, package (SOIC-8), and core functionality. Differences lie in temperature rating (MC34063A: 0°C to +70°C; MC33063A: −40°C to +85°C; NCV33063A: −40°C to +125°C) and qualification (AEC-Q100 for NCV prefix). All use the same MC34063ADG pin assignments and electrical interface, enabling direct substitution where temperature and automotive compliance requirements align.
MC34063ADG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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
MC34063ADG FAQ
1.How can I place an order for MC34063ADG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063ADG 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 MC34063ADG reliable?
The price and inventory of MC34063ADG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063ADG is usually 5 days.
3.What payment methods are accepted for MC34063ADG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063ADG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063ADG?
MC34063ADG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063ADG 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 MC34063ADG?
For technical support, including MC34063ADG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063ADG requirements.
6.How does Aetrix verify that MC34063ADG is sourced from the original manufacturer or authorized distributors?
All MC34063ADG 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 MC34063ADG meets industry standards.
7.What is the process for return or replacement of MC34063ADG?
All MC34063ADG units undergo pre-shipment inspection (PSI). If there is an issue with MC34063ADG, 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 MC34063ADG part is unused and in its original packaging.
Return procedure for MC34063ADG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC34063ADG Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
