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onsemi KA34063A
- Part No.:
- KA34063A
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
KA34063A.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,996
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Product details
Overview
KA34063A from ON Semiconductor is a monolithic DC-DC switching regulator controller IC featuring an internal 1.5 A output switch, 3.0–40 V input range, and adjustable output voltage. It supports step-up, step-down, and inverting topologies and operates at frequencies from 100 Hz to 100 kHz. It is used in low-cost power supply designs for industrial instrumentation and battery-powered portable equipment.
For engineers reviewing the KA34063A datasheet, pinout, applications, or equivalent options, key selection considerations include its integrated high-current switch, current-limit sense threshold (300 mV typ), oscillator timing current ratio (6.1 typ), and dual-package availability (8-DIP/8-SOP) - all critical for legacy design support and cost-sensitive SMPS implementations.
Technical Context
The KA34063A integrates a temperature-compensated 1.24 V bandgap reference, a duty-cycle-controlled oscillator with programmable frequency via external capacitor/resistor, and a Darlington output switch capable of 1.5 A peak current. Its comparator features 50–400 nA input bias current and ±2.0 mV line regulation over 3–40 V supply.
Internal architecture includes separate current-sense (pin 7), oscillator timing (pin 3), and drive output (pin 2) nodes, enabling direct control of external NPN transistors for higher-power configurations. The device lacks synchronous rectification or soft-start but provides short-circuit limiting via internal 300 mV current-sense threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Output Switch Current | 1.5 A (pulsed) - enables direct driving of inductive loads up to ~10 W without external transistor in basic boost/buck designs. |
| Oscillator Frequency Range | 100 Hz to 100 kHz - allows trade-off between size (larger L/C at low f) and efficiency/noise (higher f increases switching loss). |
| Current Limit Threshold | 300 mV (typ) - sets overcurrent trip point using single sense resistor; enables precise, temperature-stable foldback protection. |
| Reference Voltage | 1.24 V (typ) - stable bandgap reference used for feedback divider; determines output voltage accuracy and load regulation sensitivity. |
| Supply Current | 2.7–4.0 mA - defines quiescent power draw; critical for battery-life estimation in always-on low-power converters. |
| Operating Temperature | 0 °C to +70 °C - commercial-grade rating suitable for non-automotive indoor industrial and consumer applications. |
Pinout & Package
KA34063A is available in two through-hole and surface-mount packages: 8-pin DIP (6.40 mm × 9.20 mm) and 8-pin SOP (4.92 mm × 6.00 mm), both with 2.54 mm (DIP) or 1.27 mm (SOP) lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (COMP) | Comparator Inverting Input | Feedback node for error amplifier; connects to voltage divider from output to set regulated voltage. |
| Pin 2 (DRIVE) | Switch Driver Output | Open-collector Darlington emitter output; drives external NPN base or directly switches inductor in low-power configs. |
| Pin 3 (CT) | Oscillator Timing Capacitor | Connects external capacitor to ground; sets oscillator frequency together with internal charge/discharge currents. |
| Pin 4 (GND) | Power Ground Reference | Common return for internal circuits, current-sense resistor, and output filter; requires low-impedance layout. |
| Pin 5 (VCC) | Positive Supply Input | Primary power rail (3–40 V); powers internal reference, oscillator, and driver; bypass capacitor required. |
| Pin 6 (Ipk Sense) | Current Limit Sense Input | Monitors voltage across external sense resistor; triggers shutdown when ≥300 mV is detected. |
| Pin 7 (SW) | Switch Collector Output | High-side switch collector node; connects to inductor in buck/boost; handles up to 40 V and 1.5 A pulsed. |
| Pin 8 (Vref) | Internal Reference Output | Provides stable 1.24 V reference; used for precision feedback or as auxiliary bias source in multi-rail designs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Switch | Eliminates need for external power transistor in ≤10 W DC-DC converters, reducing BOM count and PCB area. |
| Adjustable Output Voltage | Enabled by internal 1.24 V reference and external resistor divider - supports outputs from ~1.25 V to >30 V depending on topology. |
| Programmable Oscillator | Frequency set by single external capacitor (no resistor needed); simplifies design and improves stability vs. RC-based oscillators. |
| Short-Circuit Protection | Automatic current limiting via 300 mV sense threshold - prevents thermal runaway during output faults without external circuitry. |
| Low Standby Current | Typical 2.7 mA supply current - minimizes no-load power loss in battery-backed or energy-conscious systems. |
Applications
| Industrial Power Supplies | Portable Battery Chargers |
|---|---|
|
Use Scenario: 12 V to 5 V/1 A step-down converter for PLC I/O modules operating from unregulated 12 V rail. IC Role / Device Role / Timing Role: Primary switching controller managing PWM duty cycle, current sensing, and oscillator timing. Use Value: Enables compact, low-cost isolated/non-isolated supply using only KA34063A, inductor, diode, and two resistors - no external MOSFET or gate driver required. |
Use Scenario: 3.7 V Li-ion battery to 5 V USB output boost converter in handheld diagnostic tools. IC Role / Device Role / Timing Role: Boost-mode controller regulating output voltage while monitoring peak inductor current for safety. Use Value: Delivers stable 5 V @ 500 mA from single-cell battery with <1% load regulation, leveraging internal 1.24 V reference and 300 mV current limit. |
| Inverting DC-DC Converters | Legacy Equipment Voltage Translation |
|
Use Scenario: Generating –5 V rail from +12 V supply in analog sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Inverting topology controller providing negative output with fixed-frequency PWM and current-mode control. Use Value: Achieves clean –5.0 V @ 200 mA with <30 mV ripple using standard passive components - avoids need for dual-output or isolated controllers. |
Use Scenario: Replacing obsolete linear regulators in aging test equipment requiring +15 V and –15 V rails from 24 V input. IC Role / Device Role / Timing Role: Dual-switching controller implementing split-rail buck-boost conversion with shared timing network. Use Value: Restores functionality in end-of-life systems with minimal redesign - leverages existing 8-DIP footprint and proven external component values. |
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 functional block diagram and pinout; identical 1.24 V reference and 300 mV current limit; rated for –40°C to +85°C industrial temp range. | Broader temperature range and RoHS-compliant packaging; validated for new designs where KA34063A is discontinued. | Select MC34063AP1G for new production requiring extended temperature operation and modern compliance; verify oscillator capacitor value per datasheet revision. |
| LM2574N-5.0 | Fixed 5 V output, 0.5 A internal switch, 52 kHz fixed frequency; no adjustable reference or external current sense - simpler but less flexible. | Drop-in replacement only for fixed 5 V buck applications; cannot replicate KA34063A's adjustable voltage or inverting capability. | Choose LM2574N-5.0 only when output voltage is fixed at 5 V and power requirement is ≤0.5 A; requires redesign of feedback and current-sense networks. |
Compared with KA34063A, MC34063AP1G offers extended temperature support and active lifecycle status, while LM2574N-5.0 trades configurability for integration and ease of use in fixed-output scenarios - making each suitable for distinct legacy refresh or cost-optimized redesign paths.
Availability
KA34063A is available at Aetrix Electronics and suitable for industrial instrumentation, portable medical monitors, and legacy equipment repair requiring stable component supply despite its discontinued status.
Supply support for KA34063A 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 (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, and logic devices for automotive, industrial, and cloud infrastructure markets.
The KA34063A belongs to ON Semiconductor's legacy switching regulator controller product line, designed for cost-sensitive, medium-power DC-DC conversion in non-safety-critical industrial and consumer applications.
FAQ
Is the KA34063A still recommended for new designs?
No - the KA34063A is officially discontinued and not recommended for new designs. ON Semiconductor advises contacting their representative for approved alternatives such as MC34063AP1G. While KA34063A remains available for legacy repair and continuity, its long-term supply is limited and no further revisions or enhancements will be issued for the KA34063A.
What are the package options for the KA34063A?
The KA34063A is offered in two packages: 8-pin plastic dual in-line package (8-DIP) and 8-pin small outline package (8-SOP). Both share identical pinout and electrical specifications. The 8-DIP version uses 2.54 mm lead pitch and is suited for through-hole prototyping and repair; the 8-SOP uses 1.27 mm pitch for space-constrained PCB layouts.
Can the KA34063A be used in inverting regulator configurations?
Yes - the KA34063A supports inverting (buck-boost) topology by connecting the switch output (pin 7) to the inductor's grounded end and referencing feedback to the negative output rail. Its internal oscillator, current-sense comparator, and Darlington driver enable stable regulation of negative voltages, commonly used for generating –5 V or –12 V rails from positive inputs.
What is the typical current limit threshold voltage for the KA34063A?
The KA34063A features a nominal current limit threshold of 300 mV (typical), with guaranteed range of 250–350 mV at 25°C. This voltage appears across the external sense resistor connected between pin 6 (Ipk Sense) and ground. Designers select the resistor value based on desired peak switch current - e.g., 0.3 Ω yields 1 A trip point.
Does the KA34063A include an internal voltage reference?
Yes - the KA34063A integrates a temperature-compensated bandgap reference delivering a stable 1.24 V (typical) at pin 8 (Vref). This reference serves as the error amplifier's threshold and is used directly in feedback networks to set output voltage. Its line regulation is ±2.0 mV over 3–40 V supply, supporting accurate regulation across wide input ranges.
KA34063A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-DIP
KA34063A FAQ
1.How can I place an order for KA34063A through Aetrix?
Please submit a Request for Quotation (RFQ) for KA34063A 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 KA34063A reliable?
The price and inventory of KA34063A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA34063A is usually 5 days.
3.What payment methods are accepted for KA34063A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA34063A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA34063A?
KA34063A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA34063A 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 KA34063A?
For technical support, including KA34063A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA34063A requirements.
6.How does Aetrix verify that KA34063A is sourced from the original manufacturer or authorized distributors?
All KA34063A 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 KA34063A meets industry standards.
7.What is the process for return or replacement of KA34063A?
All KA34063A units undergo pre-shipment inspection (PSI). If there is an issue with KA34063A, 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 KA34063A part is unused and in its original packaging.
Return procedure for KA34063A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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