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onsemi NCP1444T
- Part No.:
- NCP1444T
- Manufacturer:
- onsemi
- Package:
- TO-220-7
- Datasheet:
-
NCP1444T.pdf
- Description:
- IC REG BST FLYBCK ADJ 4A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,263
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Product details
Overview
NCP1444T 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 regulated positive output voltages in portable computing and battery-powered systems.
For engineers reviewing the NCP1444T datasheet, pinout, applications, or equivalent options, key selection criteria include switching frequency (560 kHz), FB reference voltage (1.276 V), thermal shutdown threshold (150 °C), duty cycle limit (92%), and TO-220-7 T-suffix package compatibility.
Technical Context
The NCP1444T employs current-mode control with slope compensation to ensure stability at >50% duty cycles and provides pulse-by-pulse current limiting via internal emitter sensing (15 mΩ). Its oscillator is trimmed for ±14% frequency accuracy at 560 kHz under nominal conditions.
It integrates dual error amplifiers - a positive-input transconductance amplifier (550 μ℧ typ.) referenced to 1.276 V and a dedicated VC pin for loop compensation, soft-start, and current-limit adjustment. Shutdown is TTL-compatible via the SS pin, with 0.85 V threshold and 12–400 μs delay depending on VCC.
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 external MOSFET and gate driver in mid-power boost designs |
| Feedback Reference Voltage | 1.276 V ±2.7%; sets precise output regulation point for positive-voltage configurations |
| Input Voltage Range | 2.7 V to 30 V; supports single-cell Li-ion up to 24 V industrial rails without pre-regulation |
| Max Duty Cycle | 92%; allows high step-up ratios (e.g., 3.3 V → 12 V) while maintaining control margin |
| Thermal Shutdown | 150 °C with 25 °C hysteresis; protects against sustained overload without external thermal monitoring |
| Shutdown Current | ≤60 μA at VCC ≤30 V; enables ultra-low quiescent power in battery standby modes |
Pinout & Package
Package: TO-220-7 (T suffix), Case 821P, 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 error amplifier; RC network here sets bandwidth, phase margin, and clamps peak switch current |
| 2. FB | Positive feedback input | Senses regulated output; 1.276 V reference enables accurate +VOUT regulation (e.g., 3.3 V, 5 V, 12 V) |
| 3. TEST | Internal test node | Leave floating or tie to GND; applying 2–6 V disables oscillator and holds switch ON (not for normal operation) |
| 4. GND | Power and signal ground | Common return for controller logic, switch emitter, and heatsink attachment; low-impedance path critical for EMI control |
| 5. VSW | Switch collector terminal | Connects to inductor/diode node; rated for 40 V max; requires short, low-inductance PCB trace |
| 6. SS | Sync input / shutdown control | TTL-compatible: <0.5 V shuts down IC; >2.5 V enables sync up to 1000 kHz; float or pull-high for normal operation |
| 7. VCC | Power supply input | Accepts 2.7–30 V; bypass with ≥33 μF low-ESR capacitor directly to GND for stable startup and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture with slope compensation | Enables stable operation at >50% duty cycle without subharmonic oscillation in boost/SEPIC |
| Frequency foldback during overcurrent | Reduces switching frequency to 20% of nominal (≈112 kHz) to limit component stress during fault conditions |
| Adjustable current limit via VC pin | External shunt between VC and GND lowers clamp voltage, enabling programmable switch current <4.0 A |
| Thermal shutdown with hysteresis | 150 °C trip +25 °C hysteresis prevents thermal cycling and ensures safe cooldown before restart |
| External synchronization capability | SS pin accepts up to 1000 kHz sync signal, enabling multi-rail power supply coherence and EMI reduction |
Applications
| Portable Computing Power Rails | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Generating 5 V/1.5 A from a 3.3 V Li-ion cell in handheld test equipment. IC Role / Device Role / Timing Role: Primary DC-DC boost controller managing inductor current, feedback regulation, and thermal protection. Use Value: 560 kHz operation allows use of 10 μH inductors and ceramic output capacitors, reducing board area by >40% vs. 280 kHz alternatives. |
Use Scenario: Providing isolated ±15 V analog supply from a 9 V alkaline battery pack in portable data loggers. IC Role / Device Role / Timing Role: Configured in inverting topology to generate negative rail; FB pin regulates magnitude of negative output. Use Value: Integrated 4.0 A switch eliminates discrete transistor and driver, simplifying BOM and improving reliability in field-deployed units. |
| Distributed Point-of-Load Boost | Industrial Sensor Interface Supply |
Use Scenario: Stepping up 12 V system rail to 24 V for actuator drivers in PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency boost stage delivering up to 4 A peak load current with tight line/load regulation. Use Value: Wide 2.7–30 V input range accommodates brownout conditions; thermal shutdown prevents latch-up during motor stall events. |
Use Scenario: Generating stable 3.3 V from variable 5–24 V field bus for MEMS pressure sensors in harsh environments. IC Role / Device Role / Timing Role: Regulator with robust ESD (2 kV HBM) and extended temperature operation (−40 °C to +125 °C junction). Use Value: 1.276 V reference tolerance (±2.7%) ensures sensor ADC reference accuracy remains within 0.5% over full temperature range. |
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 | 300 kHz fixed frequency; 2.5 A switch; no integrated sync or frequency foldback | Lacks thermal hysteresis and overcurrent foldback; requires external current sense resistor | Choose for cost-sensitive, lower-current (<2.5 A) designs where 560 kHz is not required |
| TPS61088RHLR | 2.5 MHz operation; 8 A switch; integrated LDO bias rail; no negative feedback option | Higher frequency enables smaller passives but higher switching loss above 12 V input | Prefer for ultra-compact, high-output-current (>4 A) applications with strict size constraints |
Compared with LM3478MM/NOPB, NCP1444T offers higher switching frequency and built-in foldback; compared with TPS61088RHLR, it provides wider input range and thermal hysteresis but requires external compensation - making NCP1444T optimal for rugged, medium-power industrial boost designs.
Availability
NCP1444T is available at Aetrix Electronics and suitable for portable computing power rails, battery-powered instrumentation, and distributed point-of-load boost requiring stable component supply across extended temperature and input voltage ranges.
Supply support for NCP1444T 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 electronics, with leadership in power management, analog, and intelligent power solutions.
The NCP1444T belongs to the NCP144X family of high-frequency, integrated-switch boost regulators designed for space-constrained, high-reliability DC-DC conversion in portable and industrial applications.
FAQ
What is the maximum output voltage achievable with the NCP1444T in boost configuration?
The NCP1444T does not impose a hard limit on output voltage; instead, VSW pin rating (40 V max) and external components define practical limits. In boost topology, VSW = VOUT + VF(diode); using a Schottky diode (VF ≈ 0.5 V), maximum safe VOUT is ~39.5 V. The NCP1444T's 30 V VCC rating and 1.276 V FB reference allow precise regulation up to this boundary when properly compensated.
Can the NCP1444T be used in an inverting (buck-boost) configuration?
Yes, the NCP1444T supports inverting converter topologies. Its current-mode control, wide input range (2.7–30 V), and ability to regulate positive feedback voltage make it suitable for generating negative outputs. The application circuit requires repositioning the inductor and diode, with FB tied to the negative rail through a resistive divider referenced to GND - confirmed in the official NCP1442/3/4/5 datasheet Figure 1 and Applications Information section.
How does the frequency foldback feature protect the NCP1444T during overload?
When FB falls below 0.4 V (indicating severe output undervoltage), the NCP1444T reduces switching frequency to 20% of nominal (≈112 kHz). This extends off-time, allowing external components (inductor, diode, capacitors) to dissipate energy more gradually and preventing thermal runaway. Combined with internal current limiting and thermal shutdown, this multi-layer protection preserves reliability during short-circuit or startup overload events.
Is the NCP1444T pin-compatible with other members of the NCP144X family?
No - NCP1444T uses the NCP1442/4 pinout (FB on Pin 2), whereas NCP1443/5 place NFB on Pin 2 and move TEST to Pin 3. Though identical in package (TO-220-7 T-suffix) and most pin functions, the FB/NFB pin assignment difference means direct PCB substitution is not possible without layout revision. Always verify pin mapping per device variant before design reuse.
What is the recommended minimum output capacitance for stable regulation with the NCP1444T?
Stable regulation requires ≥33 μF total output capacitance with ≤0.3 Ω ESR, as validated in the NCP1444T reference design (Figure 1: 33 μF ×2). Ceramic + bulk electrolytic combinations are preferred: e.g., 10 μF X7R ceramic (low ESR, high-frequency filtering) paralleled with 22 μF low-ESR aluminum polymer (bulk energy storage). Lower capacitance risks output overshoot and instability, especially under dynamic load steps.
NCP1444T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-7
- Packaging:
- Bag
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
NCP1444T FAQ
1.How can I place an order for NCP1444T through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1444T 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 NCP1444T reliable?
The price and inventory of NCP1444T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1444T is usually 5 days.
3.What payment methods are accepted for NCP1444T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1444T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1444T?
NCP1444T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1444T 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 NCP1444T?
For technical support, including NCP1444T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1444T requirements.
6.How does Aetrix verify that NCP1444T is sourced from the original manufacturer or authorized distributors?
All NCP1444T 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 NCP1444T meets industry standards.
7.What is the process for return or replacement of NCP1444T?
All NCP1444T units undergo pre-shipment inspection (PSI). If there is an issue with NCP1444T, 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 NCP1444T part is unused and in its original packaging.
Return procedure for NCP1444T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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