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onsemi NCP1444FR4
- Part No.:
- NCP1444FR4
- Manufacturer:
- onsemi
- Package:
- Powerflex-7
- Datasheet:
-
NCP1444FR4.pdf
- Description:
- IC REG BST FLYBCK ADJ 7POWERFLEX
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
NCP1444FR4 from onsemi is a 560 kHz current-mode boost regulator IC with integrated 4.0 A NPN power switch, 1.276 V positive feedback reference, and wide 2.7 V to 30 V input range. It supports boost, SEPIC, and inverting topologies and delivers stable output voltage regulation in portable computing and battery-powered systems.
For engineers reviewing the NCP1444FR4 datasheet, pinout, applications, or equivalent options, key selection criteria include switching frequency (560 kHz), integrated switch current rating (4.0 A), feedback polarity (positive), thermal shutdown threshold (150°C), and PowerFLEX TO-220–7 package compatibility.
Technical Context
The NCP1444FR4 employs current-mode control with slope compensation to ensure stability at duty cycles above 50%, using an internal 15 m emitter resistor for current sensing and a fixed-ramp oscillator synchronized up to 1000 kHz via the SS pin. Its transconductance error amplifier (550 µS typ.) drives the VC pin for loop compensation and soft-start control.
It features frequency foldback during overload (reducing to 120 kHz when FB < 0.4 V), built-in overcurrent protection with 8.0 A current limit (80% duty cycle), and thermal shutdown with 25°C hysteresis. The IC operates across −40°C to +125°C junction temperature and supports both positive-output regulation and external synchronization without additional components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 560 kHz nominal; enables compact magnetics and low-profile output filters |
| Integrated Switch Current | 4.0 A guaranteed; eliminates need for external MOSFET in ≤15 W boost designs |
| Feedback Reference Voltage | 1.276 V ±2.7%; sets output voltage accuracy in positive-feedback configurations |
| Input Voltage Range | 2.7 V to 30 V; supports single-cell Li-ion up to 24 V industrial rails |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis; prevents latch-up during sustained overload |
| Shutdown Current | ≤60 µA at VCC ≤30 V; enables ultra-low-power standby in battery systems |
| Maximum Duty Cycle | 92% max; allows high step-up ratios (e.g., 3.3 V → 12 V) with margin |
Pinout & Package
Package: PowerFLEX 7-pin 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 | Output of transconductance error amplifier; clamped 0.47–1.64 V; RC network here sets bandwidth and phase margin |
| 2. FB | Positive feedback input | Senses regulated output via resistive divider; triggers frequency foldback below 0.4 V |
| 3. TEST | Internal test logic interface | Must be floating or grounded; voltage 2.0–6.0 V disables oscillator and holds switch ON |
| 4. GND | Power and signal ground | Common return for controller, switch emitter, and heatsink; low-inductance path critical for EMI control |
| 5. VSW | Switch collector node | Connects to inductor/diode junction; rated 40 V max; requires short trace to minimize ringing |
| 6. SS | Synchronization & shutdown | TTL-compatible input; low = shutdown (≤60 µA); high or open = normal operation; accepts sync up to 1000 kHz |
| 7. VCC | Supply input | Accepts 2.7–30 V; bypass capacitor mandatory; powers internal regulator and driver stage |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture with slope compensation | Enables stable operation >50% duty cycle without subharmonic oscillation in boost/SEPIC |
| Frequency foldback under overload | Reduces switching frequency to 120 kHz when FB < 0.4 V, limiting peak inductor current and component stress |
| Integrated 4.0 A NPN switch with 1.0 V VCE(sat) | Eliminates external transistor and gate driver; reduces BOM count and layout area in space-constrained designs |
| VC pin clamp and current-sense gain | Allows programmable current limit reduction via external shunt; uses 5× gain and 15 m sense resistor for precise scaling |
| Thermal shutdown with hysteresis | Shuts down at 150°C and restarts at 125°C; prevents thermal runaway during transient overloads |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Step-up DC-DC conversion in ultrabooks and tablets requiring 5 V or 12 V rail from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary boost controller managing inductor current, feedback loop, and thermal safety. Use Value: 560 kHz operation enables use of ≤10 µH inductors and ceramic output capacitors, reducing solution size by >30% vs. 280 kHz alternatives. |
Use Scenario: Powering precision analog front-ends and ADCs in handheld test equipment powered by AA/AAA batteries. IC Role / Device Role / Timing Role: Regulated boost source maintaining stable 3.3 V supply despite falling battery voltage (down to 2.7 V). Use Value: 2.7 V minimum start-up and 60 µA shutdown current extend runtime by >25% in sleep-mode intervals. |
| Distributed Point-of-Load Supply | Industrial Sensor Node Power |
Use Scenario: Local 5 V generation for FPGA I/O banks or communication interfaces (e.g., RS-485 transceivers) in modular PLC backplanes. IC Role / Device Role / Timing Role: Isolated boost stage delivering clean, regulated output with minimal external components. Use Value: Integrated 4.0 A switch and current-mode control eliminate need for external current-sense resistor and improve load transient response (<5 µs recovery). |
Use Scenario: Powering wireless sensor modules (LoRaWAN, NB-IoT) operating from 3.6 V primary lithium cells in remote monitoring deployments. IC Role / Device Role / Timing Role: High-efficiency boost converter enabling >85% efficiency at 100 mA load across full battery discharge curve. Use Value: Wide 2.7–30 V input range accommodates aging cells and surge transients; thermal hysteresis prevents cycling during ambient temperature swings. |
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 | Higher design flexibility but larger footprint and added BOM cost | Choose when >4.0 A output current or custom frequency tuning is required |
| TPS61088RHLR | 5.5 A integrated switch; 570 kHz fixed frequency; 2.7–12 V input only | Optimized for USB PD and single-cell Li-ion; lacks 30 V input capability | Prefer for consumer electronics with strict 12 V max input; avoid for industrial 24 V rail compatibility |
Compared with LM3478MM/NOPB and TPS61088RHLR, the NCP1444FR4 uniquely balances high integration (4.0 A switch), wide input (2.7–30 V), and robust thermal protection in a TO-220 package-making it optimal for industrial and portable systems needing reliability without design complexity.
Availability
NCP1444FR4 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 voltage ranges.
Supply support for NCP1444FR4 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 is a global semiconductor supplier focused on energy-efficient innovation, with leadership in power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1444FR4 belongs to onsemi's NCP144x family of high-current boost regulators designed specifically for compact, high-reliability DC-DC conversion in battery-powered and wide-input industrial applications.
FAQ
What is the maximum output current achievable with the NCP1444FR4 in a boost configuration?
The NCP1444FR4 integrates a 4.0 A guaranteed switch, but maximum continuous output current depends on topology, input/output voltage ratio, thermal management, and efficiency. In a typical 3.3 V to 5 V boost at 560 kHz with proper heatsinking, NCP1444FR4 reliably delivers 1.5 A output. At higher step-up ratios (e.g., 3.3 V to 12 V), output current is limited to ~0.8 A due to duty cycle and thermal constraints. Always verify with measured thermal rise under actual load conditions.
Does the NCP1444FR4 support negative output voltage generation?
No - the NCP1444FR4 is configured for positive feedback (FB pin) and is specified only for positive-output boost, SEPIC, or inverting configurations where the regulated rail is referenced to system ground. For true negative-output regulation (e.g., −5 V), the NCP1443 or NCP1445 variants with NFB pin and −2.475 V reference must be used. Using NCP1444FR4 in a negative-output circuit will result in incorrect regulation or instability.
How does the frequency foldback feature protect the NCP1444FR4 during overload?
When the FB pin voltage drops below 0.4 V - indicating severe overload or short-circuit - the NCP1444FR4 automatically reduces switching frequency from 560 kHz to ~120 kHz. This extends off-time, lowers peak inductor current, and reduces average power dissipation in both the internal switch and external components. Combined with current limiting and thermal shutdown, this multi-layer protection prevents damage during sustained fault conditions.
Can the NCP1444FR4 be synchronized to an external clock, and what is the supported range?
Yes - the SS pin of the NCP1444FR4 accepts TTL-level synchronization signals up to 1000 kHz, allowing precise timing alignment with other power stages or system clocks. Synchronization occurs on rising edges and resets the internal oscillator. For reliable locking, the external clock must have <20 ns rise time and amplitude ≥2.5 V. If unused, SS should be left floating or tied to VCC; grounding forces shutdown mode.
What is the purpose of the TEST pin on the NCP1444FR4, and how should it be handled?
Pin 3 (TEST) connects to internal factory test circuitry and has no functional role in normal operation. It must be left floating or tied to GND. Applying any voltage between 2.0 V and 6.0 V disables the oscillator and forces the internal power switch into continuous conduction - a condition that can cause catastrophic failure if external components are not rated for DC current. Never bias the TEST pin externally in application circuits.
NCP1444FR4 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:
- 560kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 7-Powerflex
NCP1444FR4 FAQ
1.How can I place an order for NCP1444FR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1444FR4 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 NCP1444FR4 reliable?
The price and inventory of NCP1444FR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1444FR4 is usually 5 days.
3.What payment methods are accepted for NCP1444FR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1444FR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1444FR4?
NCP1444FR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1444FR4 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 NCP1444FR4?
For technical support, including NCP1444FR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1444FR4 requirements.
6.How does Aetrix verify that NCP1444FR4 is sourced from the original manufacturer or authorized distributors?
All NCP1444FR4 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 NCP1444FR4 meets industry standards.
7.What is the process for return or replacement of NCP1444FR4?
All NCP1444FR4 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1444FR4, 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 NCP1444FR4 part is unused and in its original packaging.
Return procedure for NCP1444FR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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