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onsemi KA34063ADTF
- Part No.:
- KA34063ADTF
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
KA34063ADTF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,719
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Product details
Overview
KA34063ADTF from ON Semiconductor is a discontinued monolithic DC-DC switching regulator controller IC featuring an internal 1.5A output switch, 3.0–40V input range, adjustable output voltage, and 100Hz–100kHz operating frequency. It supports step-up, step-down, and inverting topologies and is commonly used in low-cost power supply designs for industrial instrumentation and embedded peripherals.
For engineers reviewing the KA34063ADTF datasheet, pinout, applications, or equivalent options, key selection considerations include its fixed internal reference (1.24V), current-limit sense threshold (300mV typ), oscillator timing current ratio (6.1 typ), saturation voltage under load (0.95V max at 1.0A), and discontinuation status requiring legacy design support planning.
Technical Context
The KA34063ADTF integrates a temperature-compensated bandgap reference (1.24V), a duty-cycle-controlled oscillator with programmable frequency via external capacitor/resistor, and a Darlington output switch capable of 1.5A peak current. Its comparator-based control loop uses a single feedback node referenced to the internal 1.24V threshold.
It operates without external transistors in basic configurations but requires external timing components (CT, RT), current-sense resistor (RSC), and output rectification/filtering. The device lacks synchronous rectification, soft-start, or overtemperature protection - features absent from its original Fairchild-era architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial rails and battery-backed systems up to 36V nominal. |
| Output Switch Current | 1.5 A peak - enables direct drive of small buck/boost converters without external pass transistor. |
| Reference Voltage | 1.24 V ±3% - sets output regulation accuracy; used with resistive divider for adjustable VOUT. |
| Oscillator Frequency Range | 100 Hz to 100 kHz - selected via CT/RT; lower frequencies improve efficiency in high-voltage conversion. |
| Current Limit Threshold | 300 mV typical - defines peak inductor current via RSC = 0.3 V / IPEAK. |
| Switch Saturation Voltage | 0.95 V max at 1.0 A - contributes directly to conduction loss; impacts thermal design in continuous mode. |
| Supply Current | 4.0 mA max - determines quiescent power draw in standby; relevant for low-power always-on circuits. |
Pinout & Package
KA34063ADTF is supplied in an 8-pin SOP (Small Outline Package) with 1.27 mm pitch, body width 3.95 mm, and standard JEDEC MS-012AC footprint. Pin 1 is marked by notch or dot; pin numbering follows counterclockwise convention from top-left corner when viewed from top with marking side up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Primary DC input connection; must be decoupled near pin with ≥10 µF ceramic + bulk capacitor. |
| 2 (GND) | Ground Reference | Power and signal ground return; requires low-impedance layout to minimize noise coupling into COMP. |
| 3 (COMP) | Error Amplifier Output | Open-collector node for external compensation network; connects to timing capacitor and feedback divider. |
| 4 (CT) | Oscillator Timing Capacitor | Connects to external capacitor (e.g., 1 nF–100 nF) to set switching frequency via ICHG/IDISCHG ratio. |
| 5 (TRIG) | Current Sense Input | Inverting input of current-limit comparator; tied to emitter of external sense resistor (RSC). |
| 6 (VCC) | Internal Bias Supply | Internally regulated ~5 V rail derived from VIN; powers internal logic and oscillator circuitry. |
| 7 (DISCH) | Timing Discharge Node | Drives external timing capacitor discharge path; works with CT to define oscillator period. |
| 8 (SW) | Switch Collector Output | High-current Darlington collector output; connects to inductor in buck/boost/inverting topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic DC-DC Controller | Integrates oscillator, reference, comparator, and 1.5A switch - eliminates need for discrete driver transistors in basic converters. |
| Adjustable Output Voltage | Enabled by 1.24V internal reference and external resistor divider - supports outputs from ~1.25V to >VIN (boost) or |
| Wide Input Range | 3.0–40V operation accommodates 5V, 12V, 24V, and 36V industrial bus rails without pre-regulation. |
| Short-Circuit Protection | Peak-current limiting via 300mV sense threshold - provides inherent foldback behavior during overload or short conditions. |
| Low Standby Current | 4.0 mA max ICC enables use in low-duty-cycle or intermittent-power applications where quiescent draw matters. |
Applications
| Industrial Power Supplies | Automotive Aftermarket Modules |
|---|---|
Use Scenario: Generating isolated 5V/12V rails from 24V vehicle batteries in diagnostic tools and CAN gateways. IC Role / Device Role / Timing Role: Primary switching controller in non-isolated buck topology; regulates output using feedback from secondary-side resistor divider. Use Value: Eliminates need for external NPN/PNP drivers; 1.5A switch handles typical loads (<10W) without heatsinking. | Use Scenario: Step-up converter powering 12V accessories (e.g., LED lighting, sensors) from 5V USB-derived sources in dashcams. IC Role / Device Role / Timing Role: Boost controller with fixed-frequency operation; timing set by 2.2nF CT and 10kΩ RT for ~50kHz switching. Use Value: Low component count enables compact PCB layout; 300mV current limit ensures safe operation under transient load surges. |
| Legacy Embedded Instrumentation | Point-of-Sale Peripheral Power |
Use Scenario: Dual-rail (±12V) generation from single 24V supply in analog front-end modules for data acquisition systems. IC Role / Device Role / Timing Role: Inverting regulator core; SW pin drives inductor to GND while diode/capacitor generate negative output. Use Value: Single-chip solution replaces dual op-amp + transistor designs; 1.24V reference ensures stable negative rail regulation. | Use Scenario: Local 3.3V supply for microcontroller and interface ICs in receipt printers powered from 9V wall adapters. IC Role / Device Role / Timing Role: Step-down controller operating at 100kHz; minimizes inductor size while maintaining >85% efficiency at 500mA load. Use Value: 40V absolute max rating allows robustness against 9V adapter ripple and line transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AP1G | Same die, 8-DIP package; higher thermal resistance; no RoHS exemption for lead content. | Preferred for through-hole prototyping or legacy rework; less suitable for high-density SMT production. | Select when DIP footprint compatibility or hand-soldering is required; verify Pb-free compliance for new production. |
| LM2574N-5.0 | Fixed 5.0V output; integrated 0.5A switch; 52kHz fixed frequency; no adjustable reference. | Used only where fixed 5V output suffices; eliminates feedback divider but limits flexibility. | Choose for simplified 5V-only designs; not interchangeable for adjustable or non-5V outputs. |
Compared with KA34063ADTF, MC34063AP1G offers identical electrical behavior in DIP form but higher thermal impedance, while LM2574N-5.0 trades adjustability and higher current for integration and fixed-output simplicity - making it viable only in narrow-use cases.
Availability
KA34063ADTF is available at Aetrix Electronics and suitable for industrial instrumentation, automotive aftermarket modules, and legacy embedded power supply designs requiring stable component supply and long-term obsolescence management.
Supply support for KA34063ADTF 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The KA34063ADTF belongs to ON Semiconductor's legacy analog power controller product line, originally developed by Fairchild Semiconductor to deliver cost-optimized, discrete-friendly DC-DC regulation for resource-constrained embedded systems.
FAQ
Is KA34063ADTF still recommended for new designs?
No. KA34063ADTF is officially discontinued and not recommended for new designs per ON Semiconductor documentation. It remains available for legacy repair, replacement, and continuity support. Engineers designing new systems should consult ON Semiconductor's current portfolio - such as the NCP3063 or NCV3063 - for drop-in-capable, enhanced-reliability alternatives with extended temperature range and improved EMI performance.
What is the function of Pin 3 (COMP) on KA34063ADTF?
Pin 3 (COMP) on KA34063ADTF is the open-collector output of the internal error amplifier. It connects to the timing capacitor (CT) and feedback network to close the regulation loop. External RC compensation between COMP and GND stabilizes the control loop; improper compensation causes oscillation or poor transient response. This pin must never be left floating and requires careful PCB routing away from noisy nodes like SW or VIN.
Can KA34063ADTF be used in a step-up (boost) configuration?
Yes, KA34063ADTF supports boost topology. In this configuration, the inductor connects between VIN and SW, the diode anode ties to SW, and the output capacitor connects from diode cathode to GND. Feedback is taken from the regulated output and applied to the TRIG pin via a resistor divider. The 1.24V reference and current-mode control enable stable boost operation up to ~30V output, provided external components (diode, inductor, capacitor) are rated accordingly.
What does the "TF" suffix mean in KA34063ADTF?
The "TF" suffix in KA34063ADTF indicates a tape-and-reel packaging option for surface-mount 8-SOP devices, compliant with EIA-481 standards. It denotes carrier tape width (12 mm), pocket pitch (8 mm), and orientation (component leads facing down). This differs from "D" (bulk tube) or "G" (green/RoHS-compliant) variants and is intended for automated SMT placement equipment.
How does KA34063ADTF implement current limiting?
KA34063ADTF implements cycle-by-cycle peak current limiting by monitoring voltage across an external sense resistor (RSC) connected between TRIG (Pin 5) and GND. When the voltage exceeds the internal 300mV threshold, the switch is turned off for that cycle. This threshold is fixed and temperature-compensated, enabling predictable overcurrent protection without additional circuitry - critical for reliability in unregulated input environments.
KA34063ADTF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100Hz ~ 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
KA34063ADTF FAQ
1.How can I place an order for KA34063ADTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KA34063ADTF 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 KA34063ADTF reliable?
The price and inventory of KA34063ADTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA34063ADTF is usually 5 days.
3.What payment methods are accepted for KA34063ADTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA34063ADTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA34063ADTF?
KA34063ADTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA34063ADTF 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 KA34063ADTF?
For technical support, including KA34063ADTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA34063ADTF requirements.
6.How does Aetrix verify that KA34063ADTF is sourced from the original manufacturer or authorized distributors?
All KA34063ADTF 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 KA34063ADTF meets industry standards.
7.What is the process for return or replacement of KA34063ADTF?
All KA34063ADTF units undergo pre-shipment inspection (PSI). If there is an issue with KA34063ADTF, 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 KA34063ADTF part is unused and in its original packaging.
Return procedure for KA34063ADTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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