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onsemi NCP1442T
- Part No.:
- NCP1442T
- Manufacturer:
- onsemi
- Package:
- TO-220-7
- Datasheet:
-
NCP1442T.pdf
- Description:
- IC REG BST FLYBCK ADJ 4A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,909
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Product details
Overview
NCP1442T from onsemi is a 280 kHz current-mode boost regulator IC with integrated 4.0 A NPN power switch, 1.276 V positive feedback reference, and TO-220-7 (Case 821P) package. It operates from 2.7 V to 30 V input, supports soft-start via SS pin, delivers regulated positive output voltages, and includes thermal shutdown with hysteresis and frequency foldback for overcurrent protection - used in portable computer DC-DC conversion.
For engineers reviewing the NCP1442T datasheet, pinout, applications, or equivalent options, key selection criteria include its fixed 280 kHz switching frequency, positive-feedback architecture, 4.0 A guaranteed switch current, TO-220-7 thermal performance, and compatibility with boost, SEPIC, and inverting topologies under wide-input-voltage conditions.
Technical Context
The NCP1442T implements current-mode control using an internal transconductance error amplifier (550 µS typ) and slope-compensated PWM comparator, enabling fast line/load regulation and inherent pulse-by-pulse current limiting. Its oscillator is trimmed to ±14% accuracy at 280 kHz, with frequency shift capability down to 68 kHz during overload.
It integrates a 40 V-rated NPN switch with 0.9 V max saturation voltage at 4.0 A, 15 mΩ emitter sense resistor, and VC pin clamping (0.47–1.64 V) for loop compensation and current limit adjustment. Shutdown is TTL-compatible via SS pin (0.85 V threshold), drawing ≤60 µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 280 kHz nominal; enables compact magnetics and reduces EMI filtering burden |
| Integrated Switch Current | 4.0 A guaranteed; eliminates external high-current transistor and simplifies layout |
| Feedback Reference Voltage | 1.276 V ±2.7%; sets precise output regulation point for positive-output 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 Output Switch Voltage | 40 V; accommodates boost outputs up to ~39.5 V with Schottky diode drop |
| Thermal Shutdown Threshold | 180 °C with 25 °C hysteresis; prevents latch-up and enables safe recovery after overtemperature events |
| Shutdown Current | ≤60 µA at VCC ≤30 V; minimizes battery drain in always-on portable systems |
Pinout & Package
Package: TO-220-7 (Case 821P), thermally enhanced with metal tab internally connected to GND pin for heatsinking.
| 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 stability and adjusts current limit |
| 2. FB | Positive output voltage feedback | Senses regulated output via resistive divider; triggers 20% frequency reduction if <0.4 V (startup/overload) |
| 3. TEST | Internal test logic interface | Leave floating or tie to GND; applying 2–6 V disables oscillator while keeping switch active |
| 4. GND | Power and signal ground | Common return for controller, switch emitter, and heatsink tab; low-impedance path critical for noise immunity |
| 5. VSW | Switch collector node | Connects to inductor/diode junction; rated for 40 V transient; shortest possible trace required to minimize EMI |
| 6. SS | Sync input / shutdown control | TTL-low (<0.85 V) forces shutdown; high-Z or >2.5 V enables operation; accepts sync pulses up to 500 kHz |
| 7. VCC | IC power supply input | Accepts 2.7–30 V; requires local 33 µF bypass capacitor to GND for ripple suppression and startup reliability |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture | Enables stable operation across wide duty cycles (up to 96%) and eliminates need for type-II/III compensation complexity |
| Frequency foldback | Reduces switching frequency to ≤120 kHz during overload, lowering peak stress on inductor, diode, and switch |
| Adjustable current limit | VC pin shunt resistor lowers clamp voltage, scaling switch current limit below 4.0 A without external sensing |
| Thermal shutdown with hysteresis | 180 °C trip +25 °C hysteresis ensures reliable thermal cycling without oscillation near limit |
| Soft-start via SS pin | Capacitor on SS pin provides controlled VCC ramp and gradual output voltage rise, preventing inrush current |
Applications
| Portable Computer Power Rails | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Generating 5 V/1.5 A from 3.3 V Li-ion battery in ultraportable laptop subsystems. IC Role / Device Role / Timing Role: Primary boost controller managing energy transfer, regulation, and fault response in DC-DC stage. Use Value: Delivers regulated output with <1.5% line/load regulation and 280 kHz switching enabling <10 µH inductors and minimal footprint. |
Use Scenario: Providing isolated ±12 V analog supply from 9 V alkaline stack in handheld test equipment. IC Role / Device Role / Timing Role: Core controller in inverting topology generating negative rail with precision feedback and thermal margin. Use Value: Achieves ±0.5% output accuracy using 1.276 V reference and supports dual-rail sequencing via SS pin control. |
| Distributed Power in Industrial IoT | SEPIC-Based Automotive Accessory Supply |
Use Scenario: Stepping up 12 V vehicle bus to 15 V for embedded sensor hub with variable load (10–1000 mA). IC Role / Device Role / Timing Role: Regulator in distributed 15 V domain, handling input transients and load steps with current-mode loop stability. Use Value: Maintains regulation during 12 V → 8 V brownout thanks to 2.7 V minimum input and fast current-loop response. |
Use Scenario: Generating stable 5 V USB power from automotive 9–16 V supply using SEPIC topology for input/output isolation. IC Role / Device Role / Timing Role: Controller implementing non-inverting buck-boost with continuous conduction mode and EMI-optimized 280 kHz clock. Use Value: Enables single-inductor design with <50 mV output ripple and built-in frequency synchronization to avoid beat frequencies. |
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 thermal shutdown hysteresis | Requires external thermal protection; lower current rating limits high-power boost designs | Select when lower cost and simpler thermal management suffice, and 2.5 A switch current is adequate |
| TPS61088RHLR | 2.5 MHz switching, 10 A switch, integrated MOSFET, 2.7–12 V input only | Not suitable for 12–30 V inputs; higher frequency demands tighter layout but enables smaller passives | Select for space-constrained designs with ≤12 V input and need for >4 A output current |
Compared with LM3478MM/NOPB and TPS61088RHLR, the NCP1442T offers superior thermal robustness (180 °C shutdown with hysteresis), wider input range (2.7–30 V), and proven reliability in industrial portable systems - making it optimal for high-voltage boost and ruggedized applications where thermal margin and input flexibility are critical.
Availability
NCP1442T is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, and distributed industrial power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1442T 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 NCP1442T belongs to the NCP144x family of high-current switching regulators designed specifically for compact, wide-input-voltage DC-DC conversion in portable and industrial systems requiring robust thermal and overload protection.
FAQ
What is the maximum input voltage supported by the NCP1442T?
The NCP1442T supports a maximum input voltage of 30 V on the VCC pin. This allows direct operation from 24 V industrial rails or multi-cell battery stacks without external pre-regulation. Exceeding 30 V risks permanent damage to the internal circuitry and power switch.
Does the NCP1442T support negative output voltage generation?
No, the NCP1442T is configured for positive feedback (FB pin) and is not capable of regulating negative output voltages. For negative outputs, use the pin-compatible NCP1443T or NCP1445T, which feature the NFB pin referenced to −2.475 V.
How does the frequency foldback feature protect the NCP1442T during overload?
During overload or short-circuit conditions, the NCP1442T reduces switching frequency from 280 kHz to as low as 68 kHz. This extends off-time, limits peak inductor current, and reduces power dissipation in both the internal switch and external components - preventing thermal runaway and enabling safe recovery.
Can the current limit of the NCP1442T be reduced below 4.0 A?
Yes. The NCP1442T's current limit is adjustable via the VC pin: connecting a resistor from VC to GND lowers the clamp voltage, thereby reducing the effective current limit. The relationship is linear - e.g., halving VC clamp voltage reduces switch current limit to ~2.0 A.
What is the recommended heatsinking approach for the NCP1442T in TO-220-7 package?
The NCP1442T's metal tab is internally connected to GND and serves as the primary thermal path. Mount it directly to a copper heatsink or PCB copper pour ≥2.1 sq. in. with 1 oz. copper. Thermal resistance junction-to-air is 1.45 °C/W on cold plate, so forced air or thermal vias significantly improve sustained 4.0 A operation.
NCP1442T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-7
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
NCP1442T FAQ
1.How can I place an order for NCP1442T through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1442T 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 NCP1442T reliable?
The price and inventory of NCP1442T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1442T is usually 5 days.
3.What payment methods are accepted for NCP1442T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1442T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1442T?
NCP1442T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1442T 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 NCP1442T?
For technical support, including NCP1442T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1442T requirements.
6.How does Aetrix verify that NCP1442T is sourced from the original manufacturer or authorized distributors?
All NCP1442T 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 NCP1442T meets industry standards.
7.What is the process for return or replacement of NCP1442T?
All NCP1442T units undergo pre-shipment inspection (PSI). If there is an issue with NCP1442T, 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 NCP1442T part is unused and in its original packaging.
Return procedure for NCP1442T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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