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onsemi NCV51411DR2
- Part No.:
- NCV51411DR2
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCV51411DR2.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,020
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Product details
Overview
NCV51411DR2 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 in vehicle infotainment and body control modules.
For engineers reviewing the NCV51411DR2 datasheet, pinout, applications, or equivalent options, key selection considerations include its SO-8 D-suffix package, BOOST pin bootstrapping requirement, VFB foldback threshold at 0.29–0.36 V, and functional pin compatibility with LT1375 for legacy design migration.
Technical Context
The NCV51411DR2 implements proprietary V² control using output voltage ripple as the primary ramp signal, enabling instantaneous duty-cycle modulation without dependence on error amplifier bandwidth. This architecture delivers ultra-fast load transient response and simplified loop compensation-typically requiring only a 0.1 µF capacitor between VC and GND.
It integrates a high-current NPN switch with saturation voltage ≤0.7 V at 1.5 A, BOOST pin biasing for base drive enhancement, and dual-protection logic: frequency foldback (to ~65 kHz) and current limit reduction (to ~1.5 A) when VFB drops below 0.29 V-critical for short-circuit survival in automotive 12 V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact magnetics and reduces EMI fundamental below 300 kHz. |
| Output Current | 1.5 A continuous; supported by on-chip NPN transistor with BOOST-assisted saturation. |
| Input Voltage Range | 4.5 V to 40 V DC; covers automotive cold-crank (≥4.5 V) and load-dump transients (≤45 V peak). |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction and current limit foldback during overloads. |
| Thermal Shutdown | 175–195 °C trip point with 42 °C hysteresis; prevents latch-up during sustained overload. |
| Shutdown Quiescent Current | 20–85 µA; enables <100 µA system sleep mode when SHDNB pulled low. |
| Sync Input Range | 305–470 kHz; accepts external clock for EMI spreading or multi-rail synchronization. |
Pinout & Package
NCV51411DR2 is housed in an SO-8 package (Case 751, D suffix), with exposed pad not present. Pin functions are validated per onsemi datasheet Rev. 17 (Feb. 2025), page 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply for NPN base drive | Enables low VCE(sat) operation; requires external 0.1 µF capacitor + diode (e.g., 1N4148) tied to VOUT. |
| 2 - VIN | Main power input | Accepts 4.5–40 V DC; handles 45 V transient peaks per AEC-Q100 load-dump spec. |
| 3 - VSW | Switch node / NPN emitter | Connects to inductor; swings negative to −1.0 V (50 ns max); requires catch diode clamping. |
| 4 - SHDNB | Active-low shutdown control | TTL-compatible; internal pull-up; pulls low (<1.0 V) to reduce IQ to ≤85 µA. |
| 5 - SYNC | External clock synchronization input | Accepts 305–470 kHz TTL pulses; disables foldback during sync mode. |
| 6 - GND | Power ground reference | Common return for internal circuits and power switch emitter path. |
| 7 - VFB | Error amplifier inverting input | Sets output voltage via resistor divider; <0.29 V triggers protection foldback. |
| 8 - VC | Error amplifier output / PWM comparator input | Provides access to compensation node; clamp limits recovery time after fault. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Uses output ripple as natural ramp signal-eliminates need for external ramp generator and enables sub-µs transient response. |
| BOOST Pin Bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting conduction loss by >30% vs. non-bootstrapped operation. |
| Frequency & Current Foldback | Under VFB <0.29 V, switches to 65 kHz and limits peak current to ~1.5 A-reducing short-circuit power dissipation by >75%. |
| Soft-Start via VC Pin | Internal error amplifier source current (15–35 mA) charges external VC-GND capacitor-no dedicated SS pin required. |
| AEC-Q100 Qualified | Qualified for automotive applications including engine bay and cabin modules; PPAP-capable with NCV prefix. |
Applications
| Automotive Infotainment Power Supply | Body Control Module (BCM) Core Rail |
|---|---|
Use Scenario: Powers 3.3 V microcontroller, CAN transceiver, and display interface in head unit under 12 V battery input with cold-crank and load-dump stress. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V/1.0 A with V²-controlled transient immunity to ignition pulses. Use Value: Maintains regulation during 4.5 V cold-crank dips and suppresses EMI via SYNC pin locking to system clock domain. | Use Scenario: Generates stable 5.0 V rail for LIN gateway, sensor interfaces, and LED drivers in door module with intermittent loads. IC Role / Device Role / Timing Role: High-efficiency step-down converter with BOOST-enhanced efficiency (>88% at 1 A) and thermal shutdown for sealed enclosures. Use Value: Eliminates need for external current-sense resistor and simplifies layout with single SO-8 footprint and minimal compensation parts. |
| ADAS Camera Module Bias Supply | Electric Power Steering (EPS) Auxiliary Rail |
Use Scenario: Supplies clean 1.8 V or 2.5 V to image sensor and ISP in rear-view camera exposed to wide ambient temperature range. IC Role / Device Role / Timing Role: Fixed-frequency buck controller with soft-start and foldback protection against cable short events. Use Value: Achieves <1% output deviation across −40°C to +125°C junction temp; VFB tolerance (±2.0%) ensures accurate voltage setting. | Use Scenario: Provides isolated 3.3 V auxiliary power for EPS motor position sensors and MCU peripherals alongside main 12 V rail. IC Role / Device Role / Timing Role: Synchronized buck regulator operating at 350 kHz (via SYNC) to avoid beat frequencies with main inverter switching. Use Value: Reduces conducted EMI by aligning switching edges with system clock-critical for ASIL-B functional safety compliance. |
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 regulator; 1.5 A, 250 kHz, no V² control; uses voltage-mode PWM with external compensation. | Lacks V² transient response and foldback protection; requires larger output capacitance for same load-step performance. | Choose for legacy Linear Tech designs where V² is unnecessary and thermal margin is ample. |
| MP2451DT-LF-Z | 1.5 A, 2 MHz buck; external MOSFET drive; no integrated NPN; requires bootstrap capacitor but no BOOST pin. | Higher frequency enables smaller inductors; lacks automotive qualification and load-dump rating. | Prefer for space-constrained industrial applications where AEC-Q100 is not required. |
Compared with LT1375CS8#PBF, NCV51411DR2 offers superior transient response and built-in short-circuit foldback; compared with MP2451DT-LF-Z, it provides automotive qualification and integrated switch-but at lower switching frequency and larger magnetics footprint.
Availability
NCV51411DR2 is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and ADAS camera power supplies requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for NCV51411DR2 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The NCV51411DR2 belongs to onsemi's automotive power management IC portfolio, designed specifically for robust DC-DC conversion in harsh vehicle environments-including start-stop, cold-crank, and load-dump conditions.
FAQ
What is the maximum input voltage the NCV51411DR2 can withstand during automotive load dump?
The NCV51411DR2 supports peak transient input voltage up to 45 V per AEC-Q100 load-dump specification (31 V @ VIN = 14 V). Its absolute maximum rating is 45 V, verified in the Maximum Ratings table (page 2 of datasheet Rev. 17). Operation beyond this risks permanent damage. The device remains functional across 4.5 V to 40 V DC, making it suitable for full automotive battery range including cold-crank events.
Does the NCV51411DR2 require an external bootstrap diode and capacitor?
Yes-the NCV51411DR2 requires an external bootstrap circuit on the BOOST pin: typically a 0.1 µF ceramic capacitor and a fast-switching diode (e.g., 1N4148) connected from VOUT to BOOST. This configuration generates a voltage ~VIN + VOUT − VF to ensure NPN saturation and minimize conduction loss. The datasheet Figure 1 and BOOST Pin section (page 8) confirm this mandatory external network.
How does the V² control architecture in the NCV51411DR2 improve transient response compared to standard voltage-mode controllers?
The NCV51411DR2's V² control uses output ripple voltage directly as the PWM ramp signal-enabling immediate duty-cycle correction without waiting for error amplifier settling. This eliminates phase lag from amplifier bandwidth limitations, achieving sub-microsecond load-step recovery. Standard voltage-mode controllers rely on slower error amplifier loops, resulting in longer recovery times and larger output excursions. The NCV51411DR2 datasheet Figure 3 and Theory of Operation section (page 6) validate this architecture's independence from error amplifier speed.
What happens to the NCV51411DR2 when the VFB pin voltage falls below 0.29 V?
When VFB drops below 0.29 V, the NCV51411DR2 activates dual-foldback protection: oscillator frequency reduces to ~65 kHz (25% of nominal), and current limit folds back from 1.6–3.0 A to 0.9–2.1 A. This significantly lowers power dissipation in both IC and external components during short-circuit or severe overload. The feature is confirmed in Electrical Characteristics (page 4) and Short Circuit section (page 9) of the NCV51411DR2 datasheet.
Is the NCV51411DR2 pin-compatible with the LT1375, and what design changes are needed for replacement?
Yes-the NCV51411DR2 is functionally pin-compatible with the LT1375 in SO-8 package per datasheet note on page 1. However, the NCV51411DR2 uses V² control (vs. voltage-mode PWM), so compensation differs: only a 0.1 µF capacitor is needed from VC to GND, whereas LT1375 requires full Type-II/III network. Also, BOOST pin routing must be added, and VFB divider may need adjustment due to different reference (1.27 V vs. 1.24 V). No PCB layout change is required.
NCV51411DR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
NCV51411DR2 FAQ
1.How can I place an order for NCV51411DR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV51411DR2 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 NCV51411DR2 reliable?
The price and inventory of NCV51411DR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV51411DR2 is usually 5 days.
3.What payment methods are accepted for NCV51411DR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV51411DR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV51411DR2?
NCV51411DR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV51411DR2 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 NCV51411DR2?
For technical support, including NCV51411DR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV51411DR2 requirements.
6.How does Aetrix verify that NCV51411DR2 is sourced from the original manufacturer or authorized distributors?
All NCV51411DR2 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 NCV51411DR2 meets industry standards.
7.What is the process for return or replacement of NCV51411DR2?
All NCV51411DR2 units undergo pre-shipment inspection (PSI). If there is an issue with NCV51411DR2, 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 NCV51411DR2 part is unused and in its original packaging.
Return procedure for NCV51411DR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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