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onsemi NCV51411PWR2
- Part No.:
- NCV51411PWR2
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
NCV51411PWR2.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
NCV51411PWR2 from onsemi is an automotive-grade 1.5 A synchronous buck regulator IC with V² control architecture, fixed 260 kHz switching frequency, 4.5 V to 40 V input range, and integrated NPN power switch. It delivers fast transient response, thermal shutdown, cycle-by-cycle current limiting, and synchronization capability for noise-sensitive or parallel-power applications - used in automotive body control modules, infotainment power rails, and industrial DC-DC point-of-load converters.
For engineers reviewing the NCV51411PWR2 datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, BOOST-pin bootstrapped drive for low saturation voltage, VFB-based frequency foldback under short-circuit, and functional pin-compatibility with LT1375 in SO-8 package.
Technical Context
The NCV51411PWR2 implements proprietary V² control, using output voltage ripple as the PWM ramp signal - enabling instantaneous duty-cycle modulation without error-amplifier bandwidth limitations. Its transconductance error amplifier (6.4 mA/V) drives the VC pin for loop compensation, while internal 1.27 V reference (±2.0%) sets regulation accuracy.
It integrates a high-current NPN switch with 0.7 V typical saturation voltage at 1.5 A, driven via external BOOST capacitor to maintain saturation and minimize on-chip dissipation. Protection includes thermal shutdown (185 °C trip), 120 ns current-limit delay, and sync-enabled frequency alignment up to 470 kHz - disabling foldback during synchronized operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact magnetics and reduces EMI filter size vs. lower-frequency regulators. |
| Output Current | 1.5 A continuous; supports mid-power automotive subsystems without external MOSFETs. |
| Input Voltage Range | 4.5 V to 40 V; accommodates automotive cold-crank (4.5 V) and load-dump (45 V transient) conditions. |
| VFB Reference | 1.270 V ±2.0%; defines output voltage accuracy via external resistor divider (e.g., 3.3 V = R1/R2 = 10.9). |
| Saturation Voltage | 0.7 V max at 1.5 A; minimizes conduction loss and junction heating in the monolithic NPN switch. |
| Sync Frequency Range | 305–470 kHz; allows noise spectral spreading or multi-phase interleaving without changing component values. |
| Shutdown Quiescent Current | 85 µA max; enables ultra-low-power sleep mode for battery-backed systems. |
Pinout & Package
NCV51411PWR2 is housed in an SO-8 (D suffix, Case 751) surface-mount package with exposed pad for thermal enhancement. Pin 1 is BOOST; Pin 6 is GND; Pin 8 is VC - all pins match LT1375 SO-8 layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | NPN base drive supply | Accepts bootstrapped voltage ≥ VIN + 2.5 V to ensure transistor saturation and reduce conduction loss. |
| 2 - VIN | Main power input | Supplies IC bias and NPN collector; withstands 45 V transient per AEC-Q100 load-dump test. |
| 3 - VSW | Switch emitter node | Connects to inductor; swings to −1.0 V for <50 ns during flyback - requires catch diode clamping. |
| 4 - SHDNB | Active-low enable | TTL-compatible; pulls below 1.0 V to enter 85 µA shutdown mode; internal pull-up eliminates need for external resistor. |
| 5 - SYNC | External clock input | Accepts 305–470 kHz TTL pulses; overrides internal oscillator and disables foldback protection. |
| 6 - GND | Power return | Common reference for all analog and power circuits; must be low-impedance connection to PCB ground plane. |
| 7 - VFB | Error amplifier inverting input | Compares output voltage to 1.27 V reference; drops below 0.29 V to trigger 4× frequency foldback and current limit reduction. |
| 8 - VC | Error amplifier output | Provides compensated control voltage to PWM comparator; 0.1 µF capacitor to GND sets soft-start and loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Uses output ripple as native PWM ramp - eliminates external compensation components and achieves sub-µs transient response. |
| BOOST-Pin Bootstrapping | Enables full NPN saturation across full input range, reducing VCE(sat) by >30% vs. non-bootstrapped operation. |
| VFB-Based Foldback Protection | Automatically reduces switching frequency to 65 kHz and peak current to 1.5 A when VFB < 0.29 V - limiting power dissipation during short circuit. |
| AEC-Q100 Qualified | Validated for automotive temperature range (−40 °C to +150 °C junction), PPAP-capable, and Pb-free/RoHS compliant. |
| Soft-Start via VC Pin | Internal error amplifier source current charges external VC capacitor - provides controlled 5+ ms output ramp without dedicated SS pin. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Regulating 12 V vehicle battery to 3.3 V for microcontroller, CAN transceiver, and sensor interface circuits in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck converter delivering stable, low-noise 3.3 V rail with load-dump immunity and thermal fault protection. Use Value: Eliminates need for external high-side switch and discrete current-sense circuitry while meeting AEC-Q100 reliability requirements. | Use Scenario: Generating isolated 5 V/1.5 A power for digital I/O expansion cards in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Standalone DC-DC converter providing regulated output with sync capability to align switching edges with master clock and reduce conducted EMI. Use Value: Enables deterministic noise spectrum management in dense backplane layouts where multiple converters operate in proximity. |
| Infotainment System Core Rail | Telematics Cellular Modem Power |
Use Scenario: Supplying 1.2 V or 1.8 V core voltage to application processors in automotive head units, requiring tight regulation and fast load-step response. IC Role / Device Role / Timing Role: Secondary-stage buck regulator following a pre-regulator, leveraging V² control for <10 µs recovery from 50% load transients. Use Value: Maintains processor stability during burst-mode cellular transmission without requiring oversized output capacitance. | Use Scenario: Powering LTE/5G modems in vehicle telematics gateways, where intermittent high-current bursts (up to 1.2 A) occur during data transmission. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with BOOST-driven NPN switch optimized for 9–36 V input range and thermal resilience. Use Value: Delivers consistent 3.8 V output during RF transmit peaks while maintaining <150 °C junction temperature under worst-case ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1375CS8#PBF | Pin-compatible SO-8 buck controller; 1.5 A NPN switch; 250 kHz fixed frequency; no AEC-Q100 qualification or load-dump rating. | Targeted at commercial/industrial designs without automotive environmental or qualification requirements. | Select LT1375CS8#PBF only if AEC-Q100, 45 V transient tolerance, or PPAP support are not required. |
| MPQ4312-AEC1 | 1.2 A synchronous buck; 2.5 V–36 V input; 2.2 MHz switching; integrated high-/low-side MOSFETs; AEC-Q100 Grade 1. | Higher frequency enables smaller inductors/capacitors but lacks BOOST pin and V² control - slower transient response than NCV51411PWR2. | Choose MPQ4312-AEC1 for space-constrained designs needing higher integration, accepting trade-off in dynamic performance. |
Compared with LT1375CS8#PBF, NCV51411PWR2 adds automotive qualification and robustness; compared with MPQ4312-AEC1, it trades higher integration for superior transient response and proven V² architecture - making it optimal for cost-sensitive, thermally demanding automotive power rails where dynamic regulation is critical.
Availability
NCV51411PWR2 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and telematics modem applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.
Supply support for NCV51411PWR2 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCV51411PWR2 belongs to onsemi's automotive-qualified DC-DC converter product line, designed specifically for robust, high-reliability power conversion in vehicles - emphasizing load-dump tolerance, thermal resilience, and functional safety readiness.
FAQ
What is the maximum input voltage transient rating for NCV51411PWR2?
The NCV51411PWR2 is rated for 45 V peak transient voltage under load-dump conditions (31 V @ VIN = 14 V), per AEC-Q100 stress testing. This exceeds standard 12 V automotive system requirements and ensures reliable operation during alternator load dump events without external TVS clamping in many implementations.
Does NCV51411PWR2 require an external bootstrap diode and capacitor?
Yes - the NCV51411PWR2 requires an external bootstrap network: typically a 0.1 µF ceramic capacitor and a 1N4148 or equivalent fast-switching diode connected between VIN and BOOST. This configuration generates the boosted gate drive voltage needed to fully saturate the internal NPN transistor across the full 4.5–40 V input range.
How does the frequency foldback feature activate in NCV51411PWR2?
The NCV51411PWR2 activates frequency foldback when the VFB pin voltage falls below 0.29 V (typical), indicating severe overload or short circuit. This reduces switching frequency from 260 kHz to ~65 kHz and lowers current limit from 2.3 A to 1.5 A - decreasing power dissipation in both the IC and external components while maintaining regulation attempt.
Is NCV51411PWR2 pin-compatible with LT1375 in SO-8 package?
Yes - NCV51411PWR2 is functionally and physically pin-compatible with the LT1375 in SO-8 (D suffix) package, including identical pin numbering, electrical roles, and footprint. However, NCV51411PWR2 adds AEC-Q100 qualification, wider input range (4.5–40 V vs. 5.5–36 V), and enhanced transient ratings not present in the LT1375.
What thermal resistance value applies to NCV51411PWR2 in SO-8 package?
For the NCV51411PWR2 in SO-8 (Case 751), the junction-to-ambient thermal resistance (RθJA) is 165 °C/W under standard JEDEC 2-layer board conditions. With proper PCB copper pour on the exposed pad and thermal vias, actual RθJA can be reduced to ≤65 °C/W - enabling 1.5 A operation at +85 °C ambient without derating.
NCV51411PWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.27V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
NCV51411PWR2 FAQ
1.How can I place an order for NCV51411PWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV51411PWR2 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 NCV51411PWR2 reliable?
The price and inventory of NCV51411PWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV51411PWR2 is usually 5 days.
3.What payment methods are accepted for NCV51411PWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV51411PWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV51411PWR2?
NCV51411PWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV51411PWR2 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 NCV51411PWR2?
For technical support, including NCV51411PWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV51411PWR2 requirements.
6.How does Aetrix verify that NCV51411PWR2 is sourced from the original manufacturer or authorized distributors?
All NCV51411PWR2 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 NCV51411PWR2 meets industry standards.
7.What is the process for return or replacement of NCV51411PWR2?
All NCV51411PWR2 units undergo pre-shipment inspection (PSI). If there is an issue with NCV51411PWR2, 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 NCV51411PWR2 part is unused and in its original packaging.
Return procedure for NCV51411PWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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