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onsemi NCP1445FR4
- Part No.:
- NCP1445FR4
- Manufacturer:
- onsemi
- Package:
- Powerflex-7
- Datasheet:
-
NCP1445FR4.pdf
- Description:
- IC REG BST FLYBCK ADJ 7POWERFLEX
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
NCP1445FR4 from onsemi is a 560 kHz, negative-feedback boost regulator IC with integrated 4.0 A NPN power switch, operating from 2.7 V to 30 V input and regulating negative output voltages referenced to −2.475 V at the NFB pin. It features current-mode control, frequency foldback during overcurrent, thermal shutdown with 25°C hysteresis, and synchronization capability up to 1000 kHz - used in portable battery-powered inverters and distributed negative rail generation.
For engineers reviewing the NCP1445FR4 datasheet, pinout, applications, or equivalent options, key selection criteria include its −2.475 V NFB reference accuracy (±0.075 V), 560 kHz nominal switching frequency, 92% max duty cycle, 4.0 A guaranteed switch current limit, and TO-220-7 (Case 821P) thermal performance with 1.45°C/W junction-to-cold-plate resistance.
Technical Context
The NCP1445FR4 implements current-mode control using a slope-compensated PWM architecture where the oscillator-derived ramp is summed with the sensed switch current to enable stable operation above 50% duty cycle. Its dual-error-amplifier design includes a dedicated negative-input transconductance amplifier (115–225 mho) referenced to −2.475 V, with VC pin clamping (0.30–0.70 V low / 1.5–1.9 V high) for loop compensation and current limiting.
Frequency synchronization is TTL-compatible via the SS pin, supporting external clocking up to 1000 kHz; shutdown is activated by pulling SS ≤0.85 V, reducing supply current to ≤60 µA. Thermal protection triggers at 150–210°C with hysteresis, and frequency foldback reduces stress during overload by dropping switching frequency to 60–160 kHz when NFB exceeds −0.65 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 560 kHz nominal (480–640 kHz range); enables compact magnetics and EMI filtering |
| NFB Reference Voltage | −2.475 V (−2.60 to −2.40 V); sets regulated negative output voltage via external resistor divider |
| Integrated Switch Current Limit | 4.0 A guaranteed (5.0–8.0 A typical max); protects external components during short-circuit events |
| Input Voltage Range | 2.7 V to 30 V; supports wide-range battery inputs (e.g., 3S Li-ion to 24 V industrial rails) |
| Thermal Shutdown Threshold | 150–210°C with 25°C hysteresis; prevents latch-up and ensures safe recovery after overheating |
| Shutdown Current | ≤60 µA at VCC ≤30 V; minimizes standby power in battery-critical systems |
| Max Duty Cycle | 92% (82–92% range); supports high step-up ratios in boost and flyback topologies |
Pinout & Package
Package: TO-220-7 (Case 821P), thermally enhanced with metal tab internally connected to GND pin for heat dissipation and low-inductance grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. VC | Loop compensation & current limit control | Output of negative error amplifier; clamped 0.30–0.70 V (low) / 1.5–1.9 V (high); RC network here sets stability and limits peak switch current |
| 2. TEST | Internal test logic interface | Must be floating or grounded; applying 2.0–6.0 V disables oscillator while keeping switch active - not for normal operation |
| 3. NFB | Negative feedback input | Senses regulated negative output; referenced to −2.475 V; >−0.65 V triggers frequency foldback to 20% nominal |
| 4. GND | Power and signal ground | Common return for controller, switch emitter, and thermal pad; low-impedance path critical for noise immunity and thermal management |
| 5. VSW | Switch collector node | Connects to inductor/diode in boost or transformer primary in flyback; rated to 40 V; requires short PCB trace to minimize ringing |
| 6. SS | Synchronization & shutdown | TTL-compatible input: low ≤0.85 V enables shutdown (≤60 µA ICC); external clock up to 1000 kHz synchronizes switching |
| 7. VCC | Power supply input | Supplies internal circuitry (2.7–30 V); bypass capacitor to GND mandatory; powers driver and bias circuits |
Key Features
| Feature | Design Value |
|---|---|
| Negative-output regulation capability | Direct −2.475 V NFB reference enables stable inverting converter designs without external op-amps |
| Current-mode control with slope compensation | Eliminates subharmonic oscillation >50% duty cycle; improves line/load transient response vs. voltage-mode |
| Frequency foldback under overload | Reduces switching frequency to 60–160 kHz when NFB >−0.65 V - lowers component stress and thermal rise |
| Integrated 4.0 A NPN switch with 15 mΩ emitter sense | Enables single-chip boost/inverting supplies up to ~15 W; eliminates external MOSFET and gate driver |
| Thermal shutdown with hysteresis | 150–210°C trip range + 25°C hysteresis ensures reliable recovery without cycling near thermal limit |
| External synchronization up to 1000 kHz | Allows EMI reduction via spread-spectrum clocks or multi-rail phase alignment in complex power systems |
Applications
| Inverting DC/DC Converter | Portable Negative Rail Generator |
|---|---|
Use Scenario: Generating −5 V or −12 V from a single 3.3 V or 5 V battery source in handheld test equipment. IC Role / Device Role / Timing Role: Primary controller and power switch in inverting topology; regulates output via NFB pin with fixed −2.475 V reference. Use Value: Eliminates need for isolated DC/DC or charge-pump ICs; achieves >85% efficiency at 1 A load with minimal BOM count. |
Use Scenario: Providing clean −3.3 V bias for RS-232 transceivers or op-amp dual supplies in battery-powered IoT gateways. IC Role / Device Role / Timing Role: Standalone negative voltage regulator with shutdown control (SS pin) for power sequencing. Use Value: 60 µA shutdown current extends battery life; 560 kHz operation allows <10 µH inductors and ceramic output caps. |
| Distributed Power for Industrial Sensors | Flyback-Based Auxiliary Supply |
Use Scenario: Local −15 V generation for analog front-end amplifiers in modular PLC I/O modules powered from 24 V bus. IC Role / Device Role / Timing Role: Non-isolated boost-derived inverter driving split-rail op-amps; uses frequency foldback during sensor fault conditions. Use Value: Robustness against intermittent shorts via foldback + thermal shutdown; wide 2.7–30 V input accommodates brownout margins. |
Use Scenario: Low-power auxiliary −12 V supply in 48 V telecom rectifier, derived from main flyback transformer auxiliary winding. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier controller and negative regulator; synchronized to primary controller via SS pin. Use Value: Synchronization eliminates beat frequencies; 92% max duty cycle supports high turns-ratio flyback designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative-output switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27762DSGR | Charge-pump inverter (no inductor); fixed −3.3 V or −5 V output; 250 mA max; no adjustable NFB | Lower noise, smaller size, but limited to ≤250 mA and fixed outputs - unsuitable for >1 A or programmable rails | Select LM27762DSGR only for ultra-low-noise, low-current, fixed-voltage applications where inductor-free design is mandatory |
| TPS60403DBVR | Charge-pump inverter; −5 V output; 60 mA max; 1 MHz switching; no NFB pin or adjustable regulation | Designed for micropower logic-level inversion (e.g., EEPROM bias); lacks current capability and regulation flexibility of NCP1445FR4 | Choose TPS60403DBVR only for sub-100 mA, space-constrained, non-adjustable −5 V needs - not a functional replacement |
Compared with LM27762DSGR and TPS60403DBVR, the NCP1445FR4 delivers programmable negative output up to 1.5 A with true regulation, inductor-based efficiency, and robust protection - making it the sole choice for medium-power, adjustable inverting supplies requiring reliability and thermal resilience.
Availability
NCP1445FR4 is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply across extended temperature and input voltage ranges.
Supply support for NCP1445FR4 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 NCP1445FR4 belongs to the NCP144x family of high-current, wide-input boost regulators designed specifically for flexible, high-efficiency DC/DC conversion in space- and thermal-constrained environments.
FAQ
What is the exact NFB reference voltage tolerance for NCP1445FR4?
The NCP1445FR4 specifies a nominal NFB reference voltage of −2.475 V, with a guaranteed range of −2.60 V to −2.40 V across temperature and process variation. This ±0.075 V tolerance directly determines output voltage accuracy in inverting configurations using standard resistor dividers, and is validated per the Rev. 8 datasheet electrical characteristics table.
Can NCP1445FR4 be used in boost topology to generate positive voltage?
No - the NCP1445FR4 is exclusively configured for negative-output regulation via its NFB pin and internal negative error amplifier. It lacks a positive FB pin and associated reference; attempting positive boost operation will result in unregulated or non-functional behavior. Use NCP1444FR4 for positive-output boost applications.
What is the maximum allowable voltage on the VSW pin of NCP1445FR4?
The absolute maximum rating for the VSW pin of NCP1445FR4 is 40 V, as specified in the Maximum Ratings table. In boost topology, this limits the sum of output voltage and diode forward drop; in flyback, it constrains reflected primary voltage plus leakage spikes. Exceeding 40 V risks permanent damage to the integrated NPN switch.
How does the SS pin function during normal operation of NCP1445FR4?
During normal operation, the SS pin of NCP1445FR4 should be left floating or tied to VCC through a pull-up resistor. It serves no active role unless synchronization or shutdown is required: a TTL-low (≤0.85 V) forces shutdown, while an external clock signal up to 1000 kHz can synchronize switching to reduce EMI or align multiple converters.
Does NCP1445FR4 support adjustable current limiting?
Yes - NCP1445FR4 supports adjustable current limiting via the VC pin. Connecting an external shunt resistor between VC and GND lowers the VC clamp voltage, which linearly reduces the internal current limit below the default 4.0 A. The relationship is defined by VC = ISW × 0.015 Ω × 5.0 V/V, enabling precise tuning for specific inductor or diode derating needs.
NCP1445FR4 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 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:
- 560kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 7-Powerflex
NCP1445FR4 FAQ
1.How can I place an order for NCP1445FR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1445FR4 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 NCP1445FR4 reliable?
The price and inventory of NCP1445FR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1445FR4 is usually 5 days.
3.What payment methods are accepted for NCP1445FR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1445FR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1445FR4?
NCP1445FR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1445FR4 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 NCP1445FR4?
For technical support, including NCP1445FR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1445FR4 requirements.
6.How does Aetrix verify that NCP1445FR4 is sourced from the original manufacturer or authorized distributors?
All NCP1445FR4 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 NCP1445FR4 meets industry standards.
7.What is the process for return or replacement of NCP1445FR4?
All NCP1445FR4 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1445FR4, 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 NCP1445FR4 part is unused and in its original packaging.
Return procedure for NCP1445FR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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