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onsemi NCV51411DR2G
- Part No.:
- NCV51411DR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCV51411DR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,982
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Product details
Overview
NCV51411DR2G from onsemi is an automotive-grade 1.5 A synchronous buck regulator IC with V² control architecture, fixed 260 kHz switching frequency, 4.5–40 V input range, and integrated NPN power switch. It delivers fast transient response, supports external synchronization, and includes thermal shutdown, cycle-by-cycle current limiting, and frequency foldback for short-circuit protection - used in engine control units, ADAS power rails, and infotainment DC-DC conversion.
For engineers reviewing the NCV51411DR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its SO-8 D-suffix package, BOOST pin bootstrapping requirement, VFB-based foldback threshold (0.29–0.36 V), 85 µA shutdown quiescent current, and functional pin compatibility with LT1375 for drop-in evaluation.
Technical Context
The NCV51411DR2G implements proprietary V² control, using output voltage ripple as the PWM ramp signal to eliminate error amplifier bandwidth dependency during transients. Its transconductance error amplifier drives the VC pin with 6.4 mA/V gain and 500 kHz unity-gain bandwidth, enabling stable regulation with only a 0.1 µF compensation capacitor.
It integrates a high-current NPN switch with 0.4–1.0 V saturation voltage at 1.5 A, driven via the BOOST pin to maintain saturation and minimize on-chip dissipation. Synchronization operates from 305–470 kHz, disabling foldback during sync mode, while VFB < 0.29 V triggers 4:1 frequency reduction and current limit foldback to ~1.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact magnetics and reduces EMI filtering burden vs. lower-frequency regulators. |
| Output Current | 1.5 A continuous; supported by on-die NPN transistor with external BOOST capacitor for saturation bias. |
| Input Voltage Range | 4.5 V to 40 V; accommodates automotive battery transients including 31 V load dump (45 V peak rating). |
| VFB Foldback Threshold | 0.29–0.36 V; initiates frequency reduction and current foldback under overload/short-circuit conditions. |
| Shutdown Quiescent Current | 20–85 µA; ensures ultra-low standby power in vehicle off-mode (VOL) applications. |
| Thermal Shutdown Trip | 175–195 °C; protects against sustained overloads with 42 °C hysteresis for reliable recovery. |
| Reference Voltage Tolerance | ±2.0% at VFB; ensures tight output regulation across temperature and line/load variations. |
Pinout & Package
NCV51411DR2G is housed in an SO-8 package (Case 751, D suffix), with exposed pad not electrically connected - thermal performance enhanced when soldered to PCB copper pour tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap gate drive supply | Provides elevated base drive to internal NPN switch; requires external 0.1 µF capacitor + diode (e.g., 1N4148) for efficient saturation and reduced conduction loss. |
| 2 - VIN | Main power input | Supplies IC bias and collector of internal NPN switch; rated for 40 V DC and 45 V transient (load dump). |
| 3 - VSW | Switch node output | Emitter of internal NPN; connects to inductor; swings negative to −1.0 V (50 ns max); requires catch diode clamp. |
| 4 - SHDNB | Active-low enable control | TTL-compatible shutdown input; internal pull-up; pulls low ≤1.0 V to enter sleep mode (<85 µA IQ). |
| 5 - SYNC | External clock input | Accepts 305–470 kHz TTL-level sync pulses; overrides internal oscillator; disables foldback during sync operation. |
| 6 - GND | Power return | Common reference for all analog and power circuits; must be low-impedance connection to minimize noise coupling. |
| 7 - VFB | Feedback input | Inverting input of error amplifier; regulates output via resistor divider; triggers foldback below 0.29 V. |
| 8 - VC | Error amplifier output | Connects to PWM comparator; clamped to limit overcurrent recovery time; compensation capacitor ties here. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Uses output ripple as PWM ramp - eliminates need for external ramp generator and enables sub-µs transient response independent of error amp bandwidth. |
| BOOST Pin Bootstrapping | Enables full NPN saturation across input range, reducing VCE(sat) to 0.4–1.0 V and minimizing on-die power loss at 1.5 A. |
| Synchronization Input | Allows precise timing alignment with system clocks or other converters to avoid beat frequencies and simplify EMI filtering. |
| Frequency & Current Foldback | Reduces switching frequency to ~65 kHz and limits peak current to ~1.5 A during short circuit - cuts power dissipation by >75% vs. full-frequency operation. |
| AEC-Q100 Qualified | Rated for automotive junction temperatures (−40 °C to +150 °C) and PPAP-capable - suitable for safety-critical ECU and ADAS subsystems. |
Applications
| Engine Control Unit (ECU) Core Supply | ADAS Camera Power Rail |
|---|---|
Use Scenario: Provides stable 3.3 V or 5.0 V rail for microcontroller, CAN transceiver, and sensor interface in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage with load dump immunity and cold-crank support down to 2.2 V startup. Use Value: AEC-Q100 qualification and 45 V transient rating ensure uninterrupted operation during cranking, load dump, and jump-start events. |
Use Scenario: Powers image signal processor (ISP) and high-speed serializer in forward-facing camera modules for lane departure warning and automatic emergency braking. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with low-noise operation enabled by SYNC pin synchronization to system clock domain. Use Value: V² control delivers <10 µs transient recovery from 50% load steps - critical for maintaining ISP clock stability and avoiding frame corruption. |
| Infotainment System USB Hub | Automotive Telematics Modem Supply |
Use Scenario: Generates 5.0 V for USB 2.0 hub ICs and touch controller in head unit or center display assemblies. IC Role / Device Role / Timing Role: Compact SO-8 buck regulator with soft-start and thermal shutdown - prevents inrush damage during hot-plug events. Use Value: 85 µA shutdown current meets OEM requirements for low-power "always-on" USB accessory detection during vehicle sleep mode. |
Use Scenario: Supplies 3.3 V to LTE/C-V2X modem ICs in telematics control units (TCUs), requiring robustness against battery voltage fluctuations. IC Role / Device Role / Timing Role: Automotive-qualified buck converter with wide 4.5–40 V input range and integrated protection - replaces discrete solutions with higher reliability. Use Value: Integrated cycle-by-cycle current limiting and thermal shutdown eliminate need for external fault-handling circuitry, reducing BOM count and layout area. |
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, 500 kHz, no V² control; uses traditional voltage-mode PWM with external compensation. | Lacks frequency foldback and BOOST pin; requires larger output capacitor for same transient response; not AEC-Q100 qualified. | Preferred for non-automotive industrial designs where higher frequency and simpler layout outweigh automotive compliance needs. |
| MPQ4312-AEC1 | 1.2 A, 2.2 MHz synchronous buck; AEC-Q100 Grade 1; integrated MOSFETs; no BOOST pin; requires external compensation. | Higher switching frequency enables smaller inductors but increases switching loss; lacks V² control's transient speed and foldback behavior. | Best suited for space-constrained applications needing ultra-small magnetics, where moderate transient response suffices. |
Compared with LT1375CS8#PBF and MPQ4312-AEC1, the NCV51411DR2G uniquely combines V² control for fastest transient response, built-in foldback protection, and automotive qualification in a legacy SO-8 footprint - making it optimal for cost-sensitive, thermally demanding ECU and ADAS power stages where reliability trumps miniaturization.
Availability
NCV51411DR2G is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, and infotainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for NCV51411DR2G 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, with leadership in automotive, industrial, cloud, and IoT power management solutions.
The NCV51411DR2G belongs to onsemi's automotive-qualified DC-DC converter product line, designed specifically for harsh-environment vehicle subsystems requiring high reliability, transient resilience, and functional safety readiness.
FAQ
What is the minimum input voltage required for NCV51411DR2G to start switching?
The NCV51411DR2G has a guaranteed startup voltage of 2.2 V to 4.4 V, with typical operation beginning at 3.3 V. Below this threshold, the internal LDO and oscillator remain inactive, preventing unintended switching during battery brownout or cold-crank conditions. This ensures clean power-up sequencing in automotive environments where battery voltage can dip below 6 V during engine cranking.
Does NCV51411DR2G require an external catch diode, and why?
Yes, NCV51411DR2G requires an external catch diode (e.g., 1N5821) because it integrates only an NPN power switch - not a synchronous rectifier. During the off-time of the internal transistor, the inductor current must be recirculated through the diode to maintain continuity. The VSW pin can swing to −1.0 V for <50 ns, so the diode must handle reverse recovery and be placed adjacent to the VSW and GND pins to minimize parasitic inductance.
How does the BOOST pin function in NCV51411DR2G, and what happens if it's left unconnected?
The BOOST pin supplies base drive to the internal NPN switch, using a bootstrap capacitor (typically 0.1 µF) charged via an external diode. If left unconnected, the NPN cannot saturate fully, increasing VCE(sat) to >2 V and causing excessive on-die power dissipation - potentially triggering thermal shutdown under 1.5 A load. Proper BOOST connection is mandatory for efficiency and thermal reliability.
Can NCV51411DR2G operate without feedback (open-loop), and what occurs at the VFB pin during fault conditions?
No, NCV51411DR2G requires closed-loop feedback via the VFB pin for regulation. If VFB is open or pulled above 0.36 V, the device operates normally; if VFB falls below 0.29 V, it enters foldback mode - reducing frequency to ~65 kHz and limiting peak current to ~1.5 A. This behavior is intentional for short-circuit protection and is documented in the Electrical Characteristics table.
Is NCV51411DR2G pin-compatible with LT1375, and are there any layout or BOM changes needed for replacement?
Yes, NCV51411DR2G is functionally pin-compatible with the LT1375 in SO-8 packaging, sharing identical pinout and basic functionality. However, the NCV51411DR2G adds BOOST pin bootstrapping (requiring a 0.1 µF capacitor and diode) and V² control (altering compensation design). No PCB changes are needed, but the feedback network and BOOST circuit must be updated per the NCV51411DR2G datasheet.
NCV51411DR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
NCV51411DR2G FAQ
1.How can I place an order for NCV51411DR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV51411DR2G 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 NCV51411DR2G reliable?
The price and inventory of NCV51411DR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV51411DR2G is usually 5 days.
3.What payment methods are accepted for NCV51411DR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV51411DR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV51411DR2G?
NCV51411DR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV51411DR2G 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 NCV51411DR2G?
For technical support, including NCV51411DR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV51411DR2G requirements.
6.How does Aetrix verify that NCV51411DR2G is sourced from the original manufacturer or authorized distributors?
All NCV51411DR2G 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 NCV51411DR2G meets industry standards.
7.What is the process for return or replacement of NCV51411DR2G?
All NCV51411DR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV51411DR2G, 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 NCV51411DR2G part is unused and in its original packaging.
Return procedure for NCV51411DR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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