My Inquiry
My Account
onsemi NCP1443FR4
- Part No.:
- NCP1443FR4
- Manufacturer:
- onsemi
- Package:
- Powerflex-7
- Datasheet:
-
NCP1443FR4.pdf
- Description:
- IC REG BST FLYBCK ADJ 7POWERFLEX
- Quantity:
- Payment:
- Shipping:
Inventory:2,270
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
NCP1443FR4 from onsemi is a 280 kHz current-mode boost regulator IC with integrated 4.0 A NPN power switch, −2.475 V negative feedback reference, and thermal shutdown with hysteresis. It operates from 2.7 V to 30 V input and supports inverting, SEPIC, and flyback topologies - used in portable computers and battery-powered systems requiring regulated negative output voltage.
For engineers reviewing the NCP1443FR4 datasheet, pinout, applications, or equivalent options, key selection criteria include its 280 kHz switching frequency, negative feedback polarity, 4.0 A guaranteed switch current, thermal shutdown threshold (150–210°C), and compatibility with high-voltage VSW operation up to 40 V.
Technical Context
The NCP1443FR4 implements current-mode control with slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier features transconductance of 115–225 mho and internal −2.475 V reference for negative output regulation.
Oscillator frequency is trimmed to 240–320 kHz (typ. 280 kHz) and supports external synchronization up to 500 kHz via the SS pin. Frequency foldback reduces stress during overcurrent by dropping to 30–120 kHz when NFB exceeds −0.65 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 240–320 kHz (typ. 280 kHz); enables compact magnetics and low-profile filter design. |
| Feedback Reference Voltage | −2.475 V (NFB pin); sets regulated negative output voltage with ±0.075 V tolerance. |
| Integrated Power Switch | 4.0 A guaranteed peak current; eliminates external transistor and simplifies PCB layout. |
| VSW Absolute Max Voltage | 40 V; supports boost outputs up to ~39.5 V with Schottky diode (VF ≈ 0.5 V). |
| Thermal Shutdown Threshold | 150–210°C with 25°C hysteresis; protects die during sustained overload without latch-up. |
| Shutdown Current | ≤60 µA at VCC ≤30 V; enables ultra-low-power standby in battery systems. |
| Minimum Input Voltage | 2.2 V (functional); allows operation down to single-cell LiFePO₄ or two alkaline cells. |
Pinout & Package
Package: 7-pin PowerFLEX (Case 936J), TO-220–7 variant with exposed metal pad for thermal dissipation and GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. VC | Loop compensation & current limit control | Output of error amplifier; clamped 0.3–1.9 V; external RC network sets stability and reduces current limit. |
| 2. TEST | Internal test logic interface | Leave floating or grounded; voltage 2.0–6.0 V disables oscillator while keeping switch active. |
| 3. NFB | Negative feedback input | Senses regulated negative output; referenced to −2.475 V; triggers frequency foldback if > −0.65 V. |
| 4. GND | Power and signal ground | Internally bonded to package metal pad; provides low-inductance return path and thermal conduction. |
| 5. VSW | Switch collector terminal | Connects to inductor/diode node; withstands 40 V transient; requires short trace to minimize EMI. |
| 6. SS | Synchronization & shutdown control | TTL-low shuts down IC (≤60 µA); external clock up to 500 kHz synchronizes switching. |
| 7. VCC | Supply input | 2.7–30 V operation; bypass capacitor required; powers internal regulator and driver stage. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture with slope compensation | Enables stable operation at >50% duty cycle in boost/SEPIC; eliminates need for external ramp generator. |
| Frequency foldback under overload | Reduces switching frequency to 30–120 kHz when NFB > −0.65 V, limiting peak inductor current and component stress. |
| Adjustable current limit via VC shunt | Connecting resistor from VC to GND lowers clamp voltage, scaling switch current below 4.0 A without redesign. |
| Thermal shutdown with hysteresis | Turns off at 150–210°C junction temp; restarts only after cooling ≥25°C - prevents thermal cycling damage. |
| Negative output regulation capability | Direct −2.475 V reference and NFB pin eliminate need for level-shifting circuitry in inverting converters. |
Applications
| Portable Battery-Powered Instruments | Industrial Negative Rail Generators |
|---|---|
Use Scenario: Handheld multimeter requiring isolated −5 V rail from single 9 V alkaline battery. IC Role / Device Role / Timing Role: Inverting converter controller regulating −5.0 V at 200 mA with 280 kHz switching. Use Value: Eliminates need for dual-input supply or transformer; achieves <1% load regulation across 50–200 mA using NFB feedback. |
Use Scenario: PLC analog I/O module needing stable −12 V bias for op-amp precision references. IC Role / Device Role / Timing Role: High-reliability inverting regulator operating from 24 V DC bus with thermal foldback protection. Use Value: Delivers −12.0 V ±1.5% over −40°C to +85°C ambient using NFB line regulation (−0.05 to +0.05%/V). |
| Medical Point-of-Care Sensors | Automotive Infotainment Audio Bias |
Use Scenario: Portable ECG front-end requiring low-noise −3.3 V supply from 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Low-input-voltage inverting regulator with soft-start via VC pin and SS-controlled enable. Use Value: Starts reliably at 2.2 V input; maintains regulation during battery discharge to 3.0 V with <50 mV ripple. |
Use Scenario: Automotive Class-D amplifier needing −5 V rail for differential input stage from 12 V battery. IC Role / Device Role / Timing Role: Boost-derived inverting regulator with sync input locked to system clock for EMI reduction. Use Value: Synchronized 280 kHz operation minimizes beat frequencies with CAN/FlexRay clocks; meets CISPR-25 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735YSDX/NOPB | 3-MHz fixed-frequency, 1.6-A switch, positive-only FB, no NFB pin or frequency foldback. | Optimized for small-size boost (not inverting); lacks negative regulation and overload protection features. | Select for space-constrained 3.3/5 V boost where negative rail not needed and thermal margin is high. |
| TPS61089RTER | 2.5-MHz, 5-A switch, positive FB only, integrated soft-start, no thermal hysteresis or NFB support. | Targets high-efficiency USB PD boost; cannot regulate negative voltages without external inversion circuitry. | Choose for >1 A positive boost with minimal BOM count; avoid when NFB-based inverting topology is required. |
Compared with LM2735YSDX/NOPB and TPS61089RTER, the NCP1443FR4 uniquely supports direct negative output regulation, frequency foldback under overload, and thermal hysteresis - making it the only option among the three for robust, self-protecting inverting converters in industrial and portable equipment.
Availability
NCP1443FR4 is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and industrial negative rail generators requiring stable component supply across extended temperature and input voltage ranges.
Supply support for NCP1443FR4 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 power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The NCP1443FR4 belongs to the NCP144x family of high-current, wide-input switching regulators designed specifically for flexible topology implementation - especially inverting, SEPIC, and boost configurations where negative or boosted rails are required from single-supply sources.
FAQ
What is the function of the NFB pin on the NCP1443FR4?
The NFB pin on the NCP1443FR4 is the negative feedback input referenced to −2.475 V. It senses the regulated negative output voltage and drives the error amplifier to maintain regulation. When NFB exceeds −0.65 V, the NCP1443FR4 activates frequency foldback, reducing switching frequency to protect components during overload or short-circuit conditions.
Can the NCP1443FR4 be used in a standard boost configuration to generate positive voltage?
No - the NCP1443FR4 is specifically configured for negative output regulation via its NFB pin and internal −2.475 V reference. For positive boost applications, use NCP1442FR4 (280 kHz, positive FB) or NCP1444FR4 (560 kHz, positive FB). The NCP1443FR4's pinout, reference polarity, and internal error amplifier topology are incompatible with standard positive-feedback boost designs.
What is the maximum allowable voltage on the VSW pin of the NCP1443FR4?
The absolute maximum voltage on the VSW pin of the NCP1443FR4 is 40 V, as specified in the Maximum Ratings table. This rating applies under transient conditions. In steady-state boost operation, VSW = VOUT + VF(diode); therefore, for reliable design, VOUT must be limited to ≤39.5 V with a Schottky diode (VF ≈ 0.5 V) to stay within the 40 V limit of the NCP1443FR4.
How does thermal shutdown with hysteresis work in the NCP1443FR4?
The NCP1443FR4 shuts down when junction temperature reaches 150–210°C and remains off until temperature drops by ≥25°C (hysteresis). This prevents rapid on/off cycling during thermal overload. Once cooled, the NCP1443FR4 resumes normal operation without requiring a power-cycle or external reset - enabling autonomous recovery in intermittently overloaded systems.
Is the NCP1443FR4 RoHS-compliant and lead-free?
Yes - the NCP1443FR4 is offered in Pb-free packages per onsemi's RoHS compliance program. The "F" suffix in NCP1443FR4 denotes lead-free finish, and the device meets JEDEC J-STD-020 moisture sensitivity level 3 requirements. Full compliance documentation, including material declarations and soldering profiles, is available in onsemi's Soldering and Mounting Techniques Reference Manual (SOLDERRM/D).
NCP1443FR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- Powerflex-7
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- 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
NCP1443FR4 FAQ
1.How can I place an order for NCP1443FR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1443FR4 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 NCP1443FR4 reliable?
The price and inventory of NCP1443FR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1443FR4 is usually 5 days.
3.What payment methods are accepted for NCP1443FR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1443FR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1443FR4?
NCP1443FR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1443FR4 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 NCP1443FR4?
For technical support, including NCP1443FR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1443FR4 requirements.
6.How does Aetrix verify that NCP1443FR4 is sourced from the original manufacturer or authorized distributors?
All NCP1443FR4 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 NCP1443FR4 meets industry standards.
7.What is the process for return or replacement of NCP1443FR4?
All NCP1443FR4 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1443FR4, 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 NCP1443FR4 part is unused and in its original packaging.
Return procedure for NCP1443FR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NCP1443FR4 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
