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onsemi NCP3063PG
- Part No.:
- NCP3063PG
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
NCP3063PG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,761
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Product details
Overview
NCP3063PG from onsemi is a monolithic step-up/down/inverting switching regulator IC featuring an internal Darlington output switch rated for 1.5 A, 40 V input operation, 150 kHz oscillator frequency, 1.25 V ±1.5% precision reference, and cycle-by-cycle current limiting. It enables compact DC-DC converter designs in cost-sensitive industrial and consumer power supplies.
For engineers reviewing the NCP3063PG datasheet, pinout, applications, or equivalent options, key selection considerations include its adjustable output voltage capability, thermal shutdown with 10°C hysteresis, exposed-pad SOIC-8 package for enhanced thermal performance, and compatibility with buck, boost, and inverting topologies using minimal external components.
Technical Context
The NCP3063PG integrates a temperature-compensated 1.25 V reference, comparator, gated oscillator with timing capacitor control (Pin 3), driver, and 1.5 A Darlington switch - enabling hysteretic regulation without external compensation. Its oscillator uses a 1:6 charge/discharge current ratio to set maximum duty cycle at ~85.7%.
Current limiting operates via peak-sense comparator monitoring voltage across an external sense resistor (RSC), triggering cycle-by-cycle shutdown when VIPK exceeds 200 mV. Thermal protection disables the switch above 160°C with 10°C hysteresis, and the exposed pad must be tied to GND for thermal and electrical integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0 V to +40 V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Output Switch Current | 1.5 A continuous - enables up to ~800 mA output in buck configuration (e.g., 12 V → 3.3 V @ 73%+ efficiency) with proper layout and heatsinking. |
| Oscillator Frequency | 150 kHz typical (110–190 kHz range) - balances EMI, inductor size, and efficiency; set by external CT capacitor (e.g., 2.2 nF). |
| Reference Voltage | 1.25 V ±1.5% - provides stable feedback threshold for accurate output voltage setting via resistor divider (e.g., R1/R2 in buck/boost circuits). |
| Current Limit Threshold | 200 mV ±35 mV - defines peak switch current via RSC = 0.2 V / IPK(MAX); e.g., 0.15 Ω sets ~1.33 A limit. |
| Thermal Shutdown | 160°C activation with 10°C hysteresis - prevents permanent damage during overload or poor PCB thermal design; resumes operation at ≤150°C. |
| Package Type | SOIC-8 with exposed pad (Case 751) - requires GND connection of exposed pad for thermal dissipation (RJA = 180°C/W, RJC = 45°C/W). |
Pinout & Package
Package: SOIC-8 NB with exposed thermal pad (Case 751-07); exposed pad must be soldered to PCB GND plane for thermal management and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Switch Collector (SWC) | Darlington switch collector terminal | Connects to inductor (boost), diode anode (buck), or transformer primary; handles full switched current up to 1.5 A. |
| 2 - Switch Emitter (SWE) | Darlington switch emitter terminal | Return path for switch current; used as current-sense node in some configurations; connects to GND in standard buck. |
| 3 - Timing Capacitor (TCAP) | Oscillator timing input | Controls switching frequency via external capacitor (e.g., 2.2 nF → 150 kHz); voltage swing limited to −0.2 V to +1.4 V. |
| 4 - GND | Ground reference for all internal circuits | Primary ground return; exposed pad must be electrically and thermally connected to this pin's net on PCB. |
| 5 - Comparator Inverting Input (COMP) | Feedback voltage input | Compares divided output voltage against 1.25 V reference; sets regulation point (e.g., VOUT = 1.25 × (1 + R2/R1)). |
| 6 - VCC | Power supply input | Supplies internal circuitry; accepts 0–40 V; bypass with ≥0.1 µF ceramic capacitor close to pin. |
| 7 - Ipk Sense (IPK) | Peak current limit sense input | Monitors voltage drop across external sense resistor (RSC) to terminate switch conduction when >200 mV. |
| 8 - N.C. | No internal connection | Unbonded; must be left floating or optionally tied to GND per layout best practice - no functional role. |
Key Features
| Feature | Design Value |
|---|---|
| 150 kHz fixed-frequency oscillator | Enables predictable EMI filtering and consistent inductor sizing; frequency adjustable via CT capacitor (110–190 kHz range). |
| Cycle-by-cycle current limiting | Prevents switch destruction during short-circuit or overload by terminating each switching cycle if sensed current exceeds threshold. |
| Internal thermal shutdown with hysteresis | Automatically disables output above 160°C and re-enables only after cooling to ≤150°C - avoids thermal runaway without external circuitry. |
| Adjustable output voltage | Supports buck, boost, and inverting topologies via external resistor divider on COMP pin; no fixed-output variants required. |
| Pb-free SOIC-8 with exposed pad | Meets RoHS requirements; exposed pad improves thermal resistance by ~40% vs. standard SOIC-8, critical for 1.5 A switch dissipation. |
Applications
| Buck (Step-Down) Power Supply | Boost (Step-Up) LED Driver |
|---|---|
|
Use Scenario: 12 V automotive or industrial rail converted to regulated 3.3 V for microcontroller and sensor subsystems. IC Role / Device Role: Primary switching controller implementing synchronous-rectified buck topology with Darlington switch and external Schottky diode. Use Value: Achieves >73% efficiency at 800 mA load with minimal BOM (1 inductor, 2 capacitors, 3 resistors, 1 diode) and no external MOSFET drivers. |
Use Scenario: Driving high-brightness white LEDs from a 5 V USB or 12 V supply requiring constant current up to 350 mA at 24 V. IC Role / Device Role: Boost controller regulating output voltage to set LED string voltage; current controlled via feedback resistor network. Use Value: Delivers >85.5% efficiency at 350 mA with low output ripple (≤350 mVpp) and tight line/load regulation (2–5 mV), suitable for portable lighting. |
| Voltage-Inverting Supply | Battery Charger Front-End |
|
Use Scenario: Generating −12 V bias rail from +5 V logic supply for op-amp dual-rail or RS-232 interface circuits. IC Role / Device Role: Inverting DC-DC converter using single inductor and polarity-reversing diode configuration. Use Value: Provides stable negative output with 49.8% efficiency at 100 mA and <300 mVpp ripple, eliminating need for dual-output transformers or charge pumps. |
Use Scenario: Pre-regulating variable solar or USB input (4.5–15 V) to fixed 5 V/4.2 V for Li-ion charging ICs in portable devices. IC Role / Device Role: Adjustable step-down regulator feeding dedicated linear or switching charger IC; handles input transients and wide VIN range. Use Value: Maintains regulation under dynamic load (80–800 mA) with <9 mV load regulation and built-in current limiting protects downstream charger from overcurrent faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AP1G | Legacy 100 kHz oscillator, lower 1.25 V reference accuracy (±2%), no thermal hysteresis, same SOIC-8 pinout. | Limited to lower-frequency designs; less robust thermal protection; higher output ripple due to lower fSW. | Select when legacy compatibility or cost sensitivity outweighs efficiency, thermal safety, and EMI performance needs. |
| NCP3063BDR2G | Same architecture and pinout; extended temperature range (−40°C to +125°C) and tighter reference tolerance (±2%) - optimized for automotive. | Valid for under-hood or industrial environments exceeding 70°C ambient; qualified to AEC-Q100. | Choose for automotive or extended-temp applications where NCP3063PG's 0°C to +70°C rating is insufficient. |
Compared with MC34063AP1G, NCP3063PG offers higher frequency, better reference accuracy, and integrated thermal hysteresis - improving size, precision, and reliability. Against NCP3063BDR2G, it trades automotive qualification for lower cost in commercial-temperature applications.
Availability
NCP3063PG is available at Aetrix Electronics and suitable for buck converters, boost LED drivers, and inverting power supplies requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for NCP3063PG 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, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The NCP3063PG belongs to onsemi's legacy DC-DC converter product line, designed to replace MC34063A with higher frequency, improved thermal protection, and enhanced current limiting for cost-sensitive, space-constrained power conversion.
FAQ
What is the maximum input voltage supported by the NCP3063PG?
The NCP3063PG supports an absolute maximum input voltage of +40 V on the VCC pin (Pin 6) and Darlington switch collector (Pin 1). Operation beyond this rating risks permanent damage. For reliable long-term use, design margins should keep VCC ≤ 36 V under transient conditions, especially with input capacitance and trace inductance that may cause voltage spikes.
Can the NCP3063PG be used in a boost configuration, and what is its typical efficiency?
Yes, the NCP3063PG is explicitly validated for boost operation - Figure 19 shows a 12 V to 24 V / 350 mA design achieving >85.5% efficiency at room temperature. Efficiency depends on external component selection (e.g., low-RDS(on) MOSFETs, low-ESR capacitors, and properly sized inductors), but the NCP3063PG's 150 kHz switching and low-loss Darlington switch enable high-efficiency boost conversion with minimal parts.
How does the current limit function work on the NCP3063PG?
The NCP3063PG implements cycle-by-cycle current limiting via the Ipk Sense pin (Pin 7). It monitors voltage across an external sense resistor (RSC) placed between VCC and the switch emitter. When this voltage exceeds 200 mV (typical), the internal comparator disables the switch for that cycle. This protects the Darlington transistor during overload or short-circuit events without latch-off, ensuring safe recovery once fault clears.
Is the exposed pad on the NCP3063PG package required to be connected to ground?
Yes - the exposed pad beneath the SOIC-8 package of the NCP3063PG must be soldered to the PCB's GND plane. Per datasheet Figure 3 and Pin Description, this connection is mandatory for both thermal performance (reducing RJA from 180°C/W to ~120°C/W in practice) and electrical stability. Leaving it unconnected risks thermal shutdown, erratic operation, or premature failure under load.
What is the purpose of the "N.C." pin (Pin 8) on the NCP3063PG?
Pin 8 of the NCP3063PG is a no-connect (N.C.) terminal - it has no internal bond wire or circuit connection. The datasheet explicitly states it is unconnected, and no functionality is assigned to it. It may be left floating or optionally tied to GND for mechanical stability or EMI reduction, but it must never be driven or loaded with external signals, as doing so violates maximum ratings and may impair device reliability.
NCP3063PG 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):
- 1.25V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
NCP3063PG FAQ
1.How can I place an order for NCP3063PG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3063PG 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 NCP3063PG reliable?
The price and inventory of NCP3063PG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3063PG is usually 5 days.
3.What payment methods are accepted for NCP3063PG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3063PG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3063PG?
NCP3063PG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3063PG 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 NCP3063PG?
For technical support, including NCP3063PG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3063PG requirements.
6.How does Aetrix verify that NCP3063PG is sourced from the original manufacturer or authorized distributors?
All NCP3063PG 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 NCP3063PG meets industry standards.
7.What is the process for return or replacement of NCP3063PG?
All NCP3063PG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3063PG, 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 NCP3063PG part is unused and in its original packaging.
Return procedure for NCP3063PG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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