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onsemi NCV51411MNR2G
- Part No.:
- NCV51411MNR2G
- Manufacturer:
- onsemi
- Package:
- 18-VFDFN Exposed Pad
- Datasheet:
-
NCV51411MNR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 18DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,351
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Product details
Overview
NCV51411MNR2G 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 multi-rail systems - used in engine control units, ADAS camera power supplies, and infotainment DC-DC conversion.
For engineers reviewing the NCV51411MNR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its V² control loop stability, BOOST pin bootstrapping requirement, SYNC pin TTL-compatible input (305–470 kHz), soft-start via VC compensation capacitor, and AEC-Q100 qualification for under-hood automotive use.
Technical Context
The NCV51411MNR2G implements proprietary V² control, using output voltage ripple as the primary ramp signal for PWM modulation - eliminating external slope compensation while enabling sub-100 ns load transient recovery. Its transconductance error amplifier (6.4 mA/V) drives the VC pin with 500 kHz unity-gain bandwidth and 70 dB open-loop gain, supporting simple 0.1 µF compensation.
It integrates a high-current NPN switch with 0.4–1.0 V saturation voltage at 1.5 A, driven via BOOST pin with 7 mA pre-driver current plus beta-dependent base current. Frequency foldback (to ~65 kHz) and current limit foldback (to 0.9–2.1 A) activate when VFB falls below 0.29 V, reducing power dissipation during short-circuit conditions without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact 15–22 µH inductors and reduces EMI filter size vs. 100 kHz alternatives. |
| Input Voltage Range | 4.5 V to 40 V; supports 12 V/24 V automotive battery rails including 31 V load dump transients. |
| Output Current | 1.5 A continuous; limited by internal NPN transistor with 0.4–1.0 V VCE(sat) at rated load. |
| V² Control Architecture | Uses output ripple + DC feedback for instantaneous duty-cycle adjustment - eliminates error amplifier bandwidth dependency for transient response. |
| SYNC Input Range | 305–470 kHz TTL-compatible; allows precise timing alignment across multiple converters to avoid beat frequencies. |
| Thermal Shutdown | Trips at 175–195 °C with 42 °C hysteresis; protects against sustained overload or poor PCB heatsinking. |
| Shutdown Quiescent Current | 20 µA typical; reduces system standby power in ignition-off modes for always-on ECUs. |
Pinout & Package
NCV51411MNR2G is housed in an 18-lead DFN package (Case 505) with exposed thermal pad, optimized for automotive thermal cycling and board-level reliability. The exposed pad must be soldered to GND for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pins 1, 2, 3, 4) | Bootstrap drive supply | Provides elevated base drive to internal NPN switch; requires 0.1 µF capacitor to VIN+output node to maintain >2.5 V headroom and minimize VCE(sat). |
| VIN (Pins 5, 6, 7) | Main power input | Supplies IC bias and collector of internal NPN; accepts 4.5–40 V with 45 V transient rating for automotive load dump. |
| VSW (Pins 8, 9, 10) | Switch emitter node | Connects to inductor; swings to −1.0 V for <50 ns during flyback - mandates short, low-inductance layout to diode and inductor. |
| SHDNB (Pin 11) | Active-low enable | TTL-compatible shutdown; pulls internal rails offline when <1.0 V, reducing quiescent current to 20 µA. |
| SYNC (Pin 12) | External clock input | Accepts 305–470 kHz rising-edge-triggered sync pulses; disables foldback features during sync mode. |
| GND (Pin 13) | Power return | Common reference for all analog and power circuits; must be connected to exposed thermal pad for RθJA = 38 °C/W. |
| VFB (Pin 14) | Error amplifier inverting input | Senses output via resistor divider; <0.29 V triggers foldback mode (frequency ÷4, current limit ↓40%). |
| VC (Pin 15) | Error amplifier output | Drives PWM comparator; clamped to 1.53 V max; 0.1 µF to GND provides soft-start and loop compensation. |
| NC (Pins 16, 17, 18) | No connection | Unbonded die pads; must remain unconnected and unstubbed to avoid parasitic coupling or thermal imbalance. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Enables <100 ns load transient recovery without external compensation components - critical for radar/LiDAR power rails. |
| Integrated NPN switch with BOOST pin | Eliminates need for external high-side driver; BOOT capacitor ensures saturation and reduces on-chip power loss by >30% vs. non-bootstrapped designs. |
| SYNC input (305–470 kHz) | Allows deterministic phase alignment of multiple NCV51411MNR2G regulators to suppress conducted EMI peaks in multi-rail infotainment systems. |
| Frequency & current foldback | Reduces switching frequency to ~65 kHz and peak current to ≤2.1 A during overloads - limits junction temperature rise and prevents thermal runaway. |
| AEC-Q100 Grade 1 qualification | Validated for −40 °C to +125 °C operation with PPAP documentation support - meets OEM requirements for power ICs in engine bay modules. |
Applications
| Engine Control Unit (ECU) Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in gasoline/diesel engine control units exposed to 125 °C ambient and 31 V load dump. IC Role / Device Role / Timing Role: Primary 5 V/3.3 V buck converter with V² control ensuring stable rail during cranking dips and alternator surges. Use Value: 4.5–40 V input range and AEC-Q100 qualification guarantee uninterrupted operation across full automotive battery profile. | Use Scenario: Supplies image sensor and ISP in forward-facing ADAS cameras requiring ultra-low noise and fast transient response. IC Role / Device Role / Timing Role: Noise-sensitive 3.3 V regulator synchronized to system clock to avoid beat frequencies in pixel data paths. Use Value: SYNC pin enables deterministic switching alignment; V² control suppresses output voltage deviation during frame-rate load steps. |
| Infotainment System Core Rail | Body Control Module (BCM) Sub-Regulator |
Use Scenario: Generates 1.2 V core voltage for application processor in head-unit systems with multiple DC-DC stages. IC Role / Device Role / Timing Role: Secondary buck stage following a high-voltage front-end; uses BOOST pin for efficiency optimization at light loads. Use Value: 85 µA shutdown current extends battery life during vehicle sleep mode; soft-start prevents inrush into downstream LDOs. | Use Scenario: Provides regulated 5 V for door module microcontrollers, LIN transceivers, and LED drivers in harsh vibration environments. IC Role / Device Role / Timing Role: Robust point-of-load regulator with thermal shutdown and cycle-by-cycle current limiting for fault-tolerant design. Use Value: Foldback protection maintains safe junction temperature during sustained short-circuit events (e.g., damaged wiring harness). |
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 variant; 1.5 A, 250 kHz, no AEC-Q100 qualification; higher 10 mA quiescent current. | Targeted at industrial/commercial designs without automotive qualification or thermal cycling requirements. | Select only if AEC-Q100 and 125 °C operation are not required; verify layout compatibility with SO-8 thermal pad absence. |
| MPQ4312-AEC1 | Monolithic 2 A buck; 2.5 MHz switching; integrated MOSFETs; no BOOST pin; requires external compensation. | Better suited for space-constrained ADAS modules needing higher frequency and smaller magnetics. | Choose when board area is critical and 2.5 MHz operation is acceptable; note lack of V² control and different transient behavior. |
Compared with LT1375CS8#PBF, NCV51411MNR2G adds AEC-Q100 compliance, lower quiescent current, and V² control for faster transients; compared with MPQ4312-AEC1, it offers simpler compensation and superior light-load efficiency via BOOST-driven NPN, but requires external catch diode and larger inductors.
Availability
NCV51411MNR2G is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera power, and infotainment subsystems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for NCV51411MNR2G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications - with leadership in power management, imaging, and intelligent sensing.
The NCV51411MNR2G belongs to onsemi's automotive-qualified DC-DC converter product line, designed specifically for robust, high-reliability power conversion in engine bay and safety-critical electronic control units.
FAQ
What is the maximum input voltage rating for the NCV51411MNR2G, and how does it handle automotive load dump?
The NCV51411MNR2G supports up to 40 V DC input with a peak transient rating of 45 V for 31 V load dump events at VIN = 14 V. Its internal protection circuitry remains functional during these transients, and the device continues regulation without latch-up or damage when used with appropriate input capacitance and layout practices per the datasheet guidelines.
Does the NCV51411MNR2G require an external catch diode, and why?
Yes, the NCV51411MNR2G requires an external catch diode (e.g., 1N5821) because it integrates only an NPN power transistor - not a synchronous MOSFET. During switch-off, the VSW node swings negative, and the diode provides the freewheeling path for inductor current. Omitting it causes destructive voltage spikes and failure of the internal switch.
How does the BOOST pin function in the NCV51411MNR2G, and what happens if it's improperly configured?
The BOOST pin supplies elevated base drive to the internal NPN transistor. It must be connected via a 0.1 µF capacitor and fast diode (e.g., 1N4148) from VIN to BOOST to generate ~VIN + VOUT − VF. If BOOST voltage falls below 2.5 V, VCE(sat) rises sharply - increasing on-chip power loss, thermal stress, and potentially triggering thermal shutdown under load.
Can the NCV51411MNR2G operate without the SYNC pin connected, and what is its default behavior?
Yes, the NCV51411MNR2G operates autonomously at its nominal 260 kHz frequency when SYNC is left floating or tied to GND. The SYNC pin is TTL-compatible and inactive by default; connecting it to a valid external clock (305–470 kHz) overrides internal oscillator timing and disables foldback features during sync mode.
What is the purpose of the VFB pin's 0.29 V foldback threshold, and how does it affect short-circuit protection?
The VFB pin's 0.29 V threshold triggers dual-foldback protection: switching frequency drops to ~65 kHz and current limit reduces to 0.9–2.1 A. This cuts power dissipation in both the IC and external components during sustained overloads or shorts, preventing thermal runaway while maintaining regulation attempt - verified in Figure 10 of the datasheet.
NCV51411MNR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 18-VFDFN 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:
- 18-DFN (5x6)
NCV51411MNR2G FAQ
1.How can I place an order for NCV51411MNR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV51411MNR2G 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 NCV51411MNR2G reliable?
The price and inventory of NCV51411MNR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV51411MNR2G is usually 5 days.
3.What payment methods are accepted for NCV51411MNR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV51411MNR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV51411MNR2G?
NCV51411MNR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV51411MNR2G 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 NCV51411MNR2G?
For technical support, including NCV51411MNR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV51411MNR2G requirements.
6.How does Aetrix verify that NCV51411MNR2G is sourced from the original manufacturer or authorized distributors?
All NCV51411MNR2G 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 NCV51411MNR2G meets industry standards.
7.What is the process for return or replacement of NCV51411MNR2G?
All NCV51411MNR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV51411MNR2G, 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 NCV51411MNR2G part is unused and in its original packaging.
Return procedure for NCV51411MNR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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