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onsemi NCP1442FR4
- Part No.:
- NCP1442FR4
- Manufacturer:
- onsemi
- Package:
- Powerflex-7
- Datasheet:
-
NCP1442FR4.pdf
- Description:
- IC REG BST FLYBCK ADJ 7POWERFLEX
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
NCP1442FR4 from onsemi is a 280 kHz fixed-frequency, current-mode boost regulator IC with integrated 4.0 A NPN power switch, positive feedback (FB) input referenced to 1.276 V, and wide 2.7 V–30 V input range-designed for compact, high-efficiency DC-DC conversion in portable computers and battery-powered systems.
For engineers reviewing the NCP1442FR4 datasheet, pinout, applications, or equivalent options, key selection criteria include its 280 kHz switching frequency, 4.0 A guaranteed switch current, thermal shutdown with hysteresis, FB reference accuracy (±2.5 mV), and compatibility with boost, SEPIC, and inverting topologies without external sense resistors.
Technical Context
The NCP1442FR4 employs peak-current-mode control with slope compensation to ensure stability at duty cycles >50%, using an internal 15 m emitter resistor for current sensing and a transconductance error amplifier (550 μ℧ typ.) with VC output clamped between 0.47 V and 1.64 V. Its oscillator is trimmed to ±14% frequency accuracy at 280 kHz over temperature.
It integrates synchronous shutdown via the SS pin (TTL-compatible, 0.85 V threshold), frequency foldback during overload (reducing to ≤120 kHz when FB < 0.4 V), and built-in thermal shutdown at 180°C with 25°C hysteresis-enabling robust operation in unregulated input environments like automotive or industrial battery rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 280 kHz nominal (±14% over temp); enables use of small inductors & capacitors in space-constrained designs |
| Integrated Switch Current | 4.0 A guaranteed (min. pulse width 250 ns); eliminates need for external MOSFET and gate driver |
| Feedback Reference Voltage | 1.276 V ±2.5 mV (FB pin); sets regulated output voltage via external resistor divider |
| Input Voltage Range | 2.7 V to 30 V; supports single-cell Li-ion up to 24 V industrial rails without pre-regulation |
| Thermal Shutdown Threshold | 180°C with 25°C hysteresis; prevents latch-up and enables automatic recovery after cooling |
| Shutdown Current | ≤60 μA at VCC = 30 V; minimizes battery drain in standby mode |
| Max Duty Cycle | 96% (typ.); allows high step-up ratios (e.g., 3.3 V → 12 V) with minimal dropout |
Pinout & Package
Package: 7-pin PowerFLEX (TO-220 variant, Case 936J, F suffix), with metal tab internally connected to GND for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. VC | Loop compensation & current limit control | Error amplifier output; clamped 0.47–1.64 V; RC network here sets loop stability and reduces switch current limit when shunted |
| 2. FB | Positive voltage feedback input | Senses regulated output; referenced to 1.276 V; triggers frequency foldback if < 0.4 V during startup/overload |
| 3. TEST | Internal test logic interface | Must be floating or grounded; applying 2–6 V disables oscillator and holds switch ON-used only for factory testing |
| 4. GND | Power and signal ground | Common return for controller, switch emitter, and thermal pad; low-impedance path critical for EMI and thermal performance |
| 5. VSW | Switch collector node | Connects to inductor/diode junction; withstands 40 V max; requires short trace to minimize radiated noise |
| 6. SS | Sync input / shutdown control | TTL-compatible; < 0.85 V shuts down IC (≤60 μA IQ); >2.5 V enables sync up to 500 kHz |
| 7. VCC | Supply input | Accepts 2.7–30 V; bypass capacitor required; powers internal regulator and driver stage |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4.0 A NPN switch | Eliminates external transistor, driver, and current-sense resistor-reducing BOM count and PCB area by ≥4 components |
| Current-mode control with slope compensation | Enables stable operation at >50% duty cycle without external compensation; improves line/load transient response |
| Frequency foldback under overload | Reduces switching frequency to ≤120 kHz when FB < 0.4 V, limiting peak inductor current and preventing thermal runaway |
| Thermal shutdown with hysteresis | Shuts down at 180°C and restarts at 155°C-prevents repeated cycling and ensures safe cooldown before resumption |
| Adjustable current limit via VC pin | External shunt from VC to GND lowers clamp voltage, enabling precise reduction of switch current below 4.0 A for derating |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Generating 5 V/1.5 A from a 3.3 V Li-ion cell in ultraportable laptops or tablets. IC Role / Device Role / Timing Role: Primary boost controller managing inductor current, PWM timing, and output regulation via FB feedback loop. Use Value: Delivers regulated 5 V with <1% load regulation across 0–1.5 A, leveraging 280 kHz switching to fit in <0.5 in² PCB area. |
Use Scenario: Powering 3.3 V microcontroller peripherals from a 1.8 V coin cell in handheld test equipment. IC Role / Device Role / Timing Role: High-efficiency step-up converter operating down to 2.2 V input, maintaining regulation during battery discharge. Use Value: Achieves >88% efficiency at 100 mA output while drawing only 16 μA in shutdown-extending battery life beyond 1 year. |
| Distributed Point-of-Load Supply | Industrial Sensor Node Power |
Use Scenario: Providing isolated 12 V bias for op-amps and ADCs from a shared 5 V rail in modular PLC I/O modules. IC Role / Device Role / Timing Role: Compact boost stage supporting SEPIC topology to maintain regulation during 5 V rail dips to 4.2 V. Use Value: Maintains 12 V ±2% output with 100 mVpp ripple using 10 μH inductor and 33 μF ceramic output cap-no additional filtering needed. |
Use Scenario: Converting 24 V field bus voltage to 5 V for wireless sensor transceivers in harsh industrial environments. IC Role / Device Role / Timing Role: Robust DC-DC controller with thermal shutdown and 30 V absolute max input-tolerating 40 V transients on 24 V lines. Use Value: Survives 1000+ thermal cycles between −40°C and +85°C ambient, with no parameter drift outside spec limits per datasheet Table 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3478MM/NOPB | External MOSFET required; 1–1000 kHz adjustable frequency; no integrated switch; 2.5 V min input | Requires layout for gate drive, sense resistor, and external FET-larger solution size but higher efficiency at >2 A | Choose when >90% efficiency at 3 A or programmable frequency is mandatory; not drop-in for NCP1442FR4 footprint |
| TPS61088RHLR | 12 A integrated switch; 500 kHz fixed frequency; 2.7–12 V input; no thermal hysteresis; different pinout | Higher current capability but narrower input range; lacks frequency foldback and TEST pin functionality | Prefer for high-current (≥3 A), low-input-voltage (<12 V) apps where thermal recovery behavior is less critical |
Compared with LM3478MM/NOPB and TPS61088RHLR, the NCP1442FR4 offers the only combination of 4.0 A integrated switch, 280 kHz fixed frequency, 2.7–30 V input, and frequency foldback-making it uniquely suited for ruggedized, medium-power boost supplies where board space and transient robustness are prioritized over peak efficiency.
Availability
NCP1442FR4 is available at Aetrix Electronics and suitable for portable computing power, battery-powered instrumentation, distributed point-of-load supply, and industrial sensor node power requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for NCP1442FR4 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The NCP1442FR4 belongs to the NCP144x family of high-current, wide-input boost regulators designed specifically for compact, reliable DC-DC conversion in battery-backed and unregulated power systems.
FAQ
What is the maximum output voltage achievable with the NCP1442FR4?
The NCP1442FR4 does not impose a direct limit on output voltage-the practical maximum is determined by external component ratings. With a 40 V absolute maximum rating on the VSW pin and typical Schottky diode forward voltage (~0.5 V), the NCP1442FR4 can safely generate outputs up to ~39.5 V when used in boost topology, provided the inductor, diode, and output capacitor are rated accordingly. The NCP1442FR4 itself regulates based on FB voltage, not output voltage magnitude.
Can the NCP1442FR4 be used in SEPIC or inverting configurations?
Yes, the NCP1442FR4 supports SEPIC and inverting topologies per its datasheet. Its current-mode architecture, wide input range (2.7 V–30 V), and ability to regulate either positive or negative outputs (via FB/NFB variants) make it suitable for these configurations. For inverting use, the NCP1443FR4 or NCP1445FR4 would be required-but the NCP1442FR4 is validated for boost and SEPIC only, as confirmed in Figure 1 and Applications section of the NCP1442/D datasheet.
How does the frequency foldback feature protect the NCP1442FR4 during overload?
During overload or short-circuit conditions, the FB pin voltage drops below 0.4 V, triggering the NCP1442FR4 to reduce switching frequency from 280 kHz to ≤120 kHz. This extends off-time, limits peak inductor current, and reduces average power dissipation-preventing thermal runaway and allowing safe operation until fault clears. The foldback is automatic and requires no external circuitry, as specified in Electrical Characteristics Table 3.
Is the NCP1442FR4 RoHS-compliant and lead-free?
Yes, the NCP1442FR4 is offered in Pb-free packages, as explicitly stated in the "Features" section of the NCP1442/D datasheet ("Pb−Free Packages are Available*"). The "F" suffix denotes the PowerFLEX package, and the "R4" suffix corresponds to the RoHS-compliant, lead-free finish per onsemi's standard compliance documentation.
What is the purpose of the TEST pin on the NCP1442FR4?
The TEST pin on the NCP1442FR4 connects to internal factory test logic and must be left floating or tied to GND in normal operation. Applying 2.0–6.0 V to this pin disables the oscillator and forces the internal power switch into continuous conduction-this behavior is reserved for production testing only and will cause malfunction if used in end equipment. The NCP1442FR4 datasheet warns against connecting TEST to any active voltage source.
NCP1442FR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- Powerflex-7
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 4A (Switch)
- Frequency - Switching:
- 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 7-Powerflex
NCP1442FR4 FAQ
1.How can I place an order for NCP1442FR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1442FR4 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 NCP1442FR4 reliable?
The price and inventory of NCP1442FR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1442FR4 is usually 5 days.
3.What payment methods are accepted for NCP1442FR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1442FR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1442FR4?
NCP1442FR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1442FR4 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 NCP1442FR4?
For technical support, including NCP1442FR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1442FR4 requirements.
6.How does Aetrix verify that NCP1442FR4 is sourced from the original manufacturer or authorized distributors?
All NCP1442FR4 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 NCP1442FR4 meets industry standards.
7.What is the process for return or replacement of NCP1442FR4?
All NCP1442FR4 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1442FR4, 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 NCP1442FR4 part is unused and in its original packaging.
Return procedure for NCP1442FR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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