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onsemi NCV890104MWR2G
- Part No.:
- NCV890104MWR2G
- Manufacturer:
- onsemi
- Package:
- 12-VDFN Exposed Pad
- Datasheet:
-
NCV890104MWR2G.pdf
- Description:
- IC REG BUCK ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,950
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Product details
Overview
NCV890104MWR2G from onsemi is an AEC-Q100 qualified automotive buck switching regulator with 2 MHz fixed-frequency operation, 4.5–36 V input range, and adjustable 0.8–5.0 V output delivering up to 1.2 A. It integrates an N-channel power switch, supports spread-spectrum EMI reduction, features programmable RSTB delay, and targets low-noise infotainment and vision systems requiring compact, AM-band-avoiding power conversion.
For engineers reviewing the NCV890104MWR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its wettable-flank DFN12 package, ±1.75% output voltage tolerance, 1.4 ms soft-start, 2 MHz switching (foldback to 500 kHz above 18 V), and integrated thermal shutdown, current limit, and short-circuit protection with frequency foldback.
Technical Context
The NCV890104MWR2G employs current-mode control with internal slope compensation optimized for a 4.7 µH inductor, enabling stable operation at duty cycles >50%. Its oscillator uses a free-running 2 MHz core with programmable spread-spectrum modulation (depth 24–42%, frequency 40–60 kHz) via external RDEPTH/RMOD resistors.
Reset functionality is implemented as an open-drain RSTB output with 92–94% regulation threshold hysteresis and capacitor-adjustable delay (tRESU = 22–35 µs for CDELAY = 100 pF). The device includes VIN frequency foldback (triggered at 18.4 V), hiccup-mode short-circuit recovery, and bootstrap-driven gate drive with DRV UVLO monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports full automotive battery range including 40 V load dump transients. |
| Output Current | 1.2 A continuous - rated for sustained delivery under thermal limits in DFN12 package. |
| Switching Frequency | 2 MHz nominal (1.8–2.2 MHz) - avoids AM radio band; folds to 500 kHz above 18.4 V to maintain regulation. |
| Output Voltage Accuracy | ±1.75% - tight tolerance ensures reliable downstream logic and sensor supply stability. |
| Quiescent Current (EN) | 3 mA - enables low-power always-on subsystems without excessive battery drain. |
| Soft-Start Time | 1.4 ms typical - prevents inrush current and stabilizes startup in sensitive audio/infotainment rails. |
| Peak Current Limit | 2.35 A typical - provides robust overcurrent protection while supporting transient load demands. |
| Thermal Shutdown | 150 °C activation - protects against sustained overload or poor PCB heatsinking in confined enclosures. |
Pinout & Package
NCV890104MWR2G is housed in a wettable-flank DFN12 (4 mm × 4 mm, 0.5 mm pitch) package with exposed thermal pad connected to GND. The package meets AEC-Q100 Grade 1 requirements and supports automated optical inspection (AOI) via edge plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Accepts 4.5–36 V battery rail; requires local ceramic input capacitor for EMI filtering and transient response. |
| SW | Power switch node | Connects to inductor and freewheeling diode cathode; carries high di/dt switching current and must be routed with minimal loop area. |
| DRV | Gate driver supply output | Provides regulated ~3.3 V to bootstrap capacitor; monitors UVLO to prevent shoot-through during low-VIN conditions. |
| RSTB | Open-drain reset output | Sinks ≥1 mA at 0.4 V; signals output regulation status after user-programmable delay via external CDELAY. |
| GND | Power and signal reference | Must connect exposed pad directly to PCB ground plane for thermal conduction and noise immunity. |
| EN | Enable control input | TTL-compatible; direct battery tie possible; pulls regulator into <5 µA shutdown when grounded. |
| DELAY | RSTB delay timing input | Capacitor-to-ground sets RSTB assertion delay; internal current source discharges CDELAY to trigger RSTB high. |
| FB | Feedback voltage sense | Monitors resistor-divider output; references internal 0.8 V bandgap; detects precharged outputs via VSSEN threshold. |
| COMP | Error amplifier output | Requires external RCOMP/CCOMP network for loop compensation; transconductance = 0.6–1.5 mS depending on VIN. |
| RDEPTH | Spread-spectrum depth adjust | Resistor-to-GND sets modulation depth (24–42%); open or short disables spread spectrum. |
| RMOD | Spread-spectrum frequency adjust | Resistor-to-GND sets modulation frequency (40–60 kHz); open or short disables spread spectrum. |
| BST | Bootstrap supply input | Connects to external CBST capacitor; enables high-side N-channel switch with low RDS(on) = 650 mΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Wettable Flank DFN12 | Enables AOI-compatible solder joint inspection and improves thermal resistance (RJA = 35 °C/W). |
| Programmable Spread Spectrum | Reduces peak EMI by >10 dB through adjustable 40–60 kHz triangular modulation of 2 MHz clock. |
| Adjustable RSTB Delay | Allows precise power sequencing with µs-level resolution using single external capacitor on DELAY pin. |
| Integrated Slope Compensation | Eliminates subharmonic oscillation for 4.7 µH inductors at >50% duty cycle without external components. |
| Short-Circuit Foldback + Hiccup | Reduces switching frequency to 200–600 kHz then enters burst mode to limit power dissipation during fault. |
| AEC-Q100 Qualified | Validated for automotive Grade 1 (−40 °C to +125 °C ambient) with PPAP support and controlled change management. |
Applications
| Audio Power Supply | Infotainment Head Unit |
|---|---|
Use Scenario: Supplies clean 3.3 V or 5.0 V to DSPs, codecs, and amplifiers in vehicle audio systems. IC Role / Device Role / Timing Role: Primary DC-DC converter providing low-noise, ripple-free rail with AM-band avoidance. Use Value: Eliminates need for bulky LC filters by operating at 2 MHz, reducing board space by >40% vs. 500 kHz solutions. |
Use Scenario: Powers display controllers, touch processors, and connectivity modules in central infotainment units. IC Role / Device Role / Timing Role: High-efficiency buck regulator with programmable reset for safe boot sequencing. Use Value: Adjustable RSTB delay ensures microcontrollers initialize only after stable 1.2 A output is confirmed. |
| Safety Vision System | Digital Instrument Cluster |
Use Scenario: Delivers regulated 3.3 V to image sensors, ISP processors, and MIPI interface circuitry in ADAS cameras. IC Role / Device Role / Timing Role: Automotive-grade power IC with load-dump tolerance and thermal shutdown for mission-critical vision rails. Use Value: Withstands 40 V transients and maintains regulation down to 4.5 V cold-crank, ensuring camera uptime during engine start. |
Use Scenario: Powers TFT-LCD drivers, microcontrollers, and CAN transceivers in digital dashboards. IC Role / Device Role / Timing Role: Compact, spread-spectrum-enabled regulator minimizing EMI interference with analog gauges and RF receivers. Use Value: Wettable flanks enable 100% solder joint inspection, meeting ASIL-B functional safety manufacturing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4312-AEC1 | 2.2 MHz, 1.2 A, 3.8–36 V input; no spread spectrum; smaller 3×3 mm QFN; lower RDS(on) = 450 mΩ. | Lacks programmable RSTB delay and spread-spectrum EMI reduction; suited for cost-sensitive non-AM-critical designs. | Select MPQ4312-AEC1 when footprint size and conduction loss are prioritized over EMI compliance and sequencing flexibility. |
| TPS62130A-Q1 | 3.2 MHz, 3 A, 3–17 V input; integrated compensation; no RSTB; higher quiescent current (15 µA shutdown). | Not rated for >18 V input or load dump; lacks reset delay adjustment; limited to mid-range automotive supplies. | Choose TPS62130A-Q1 only for 12 V systems where higher current and simpler layout outweigh 36 V capability and RSTB programmability. |
Compared with MPQ4312-AEC1 and TPS62130A-Q1, the NCV890104MWR2G uniquely combines 36 V input tolerance, programmable spread spectrum, and capacitor-adjustable RSTB delay in a wettable-flank DFN-making it the only option qualified for AM-band-sensitive, load-dump-prone, and sequenced-boot automotive subsystems.
Availability
NCV890104MWR2G is available at Aetrix Electronics and suitable for automotive infotainment, ADAS vision systems, and digital instrument clusters requiring stable component supply across extended temperature and voltage ranges.
Supply support for NCV890104MWR2G 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 technologies for automotive, industrial, cloud, and IoT applications, with leadership in power management and AEC-Q100 qualified components.
The NCV890104MWR2G belongs to onsemi's automotive-grade DC-DC converter product line, designed specifically for low-EMI, high-reliability power conversion in driver information and safety-critical electronic control units.
FAQ
What is the minimum input voltage required for NCV890104MWR2G to regulate a 3.3 V output?
The NCV890104MWR2G requires a minimum input voltage of 4.5 V to regulate a 3.3 V output, as specified in the Undervoltage Lockout (UVLO) start threshold (VUVLSTT = 4.1–4.5 V). Below this, the device inhibits switching and resets soft-start to prevent unstable regulation. This ensures reliable operation during automotive cold-crank conditions.
How does the spread-spectrum function work on the NCV890104MWR2G, and what external components are needed?
The NCV890104MWR2G implements spread-spectrum modulation by applying a triangle wave to its 2 MHz oscillator, adjustable via two external resistors: RMOD (to GND) sets modulation frequency (40–60 kHz), and RDEPTH (to GND) sets modulation depth (24–42%). Open or shorted pins disable the feature. No capacitors or active components are required beyond these resistors.
What is the purpose of the DELAY pin on the NCV890104MWR2G, and how is it configured?
The DELAY pin on the NCV890104MWR2G programs the time interval between output regulation and RSTB assertion. An external capacitor to GND sets this delay; for example, 100 pF yields 22–35 µs typical. The internal current source charges and discharges CDELAY to generate a precise, temperature-stable delay independent of external supply variations.
Does the NCV890104MWR2G require an external freewheeling diode, and why?
Yes, the NCV890104MWR2G requires an external Schottky freewheeling diode connected from SW to GND. Although it integrates an N-channel power switch, it does not integrate a synchronous rectifier. The diode provides the return path for inductor current during the switch OFF period, and its selection must account for peak current (≥2.35 A) and reverse voltage (≥40 V).
What thermal considerations apply to the NCV890104MWR2G in a 4-layer PCB layout?
For reliable operation, the NCV890104MWR2G's exposed thermal pad must be soldered to a solid GND plane with ≥4 thermal vias (0.3 mm diameter) connecting to inner and bottom layers. With this layout on a 1 sq. in. 4-layer board (1 oz. copper), junction-to-ambient thermal resistance is 35 °C/W. Exceeding TJ = 150 °C triggers thermal shutdown, halting switching until cooldown.
NCV890104MWR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 12-VDFN Exposed Pad
- 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x4)
NCV890104MWR2G FAQ
1.How can I place an order for NCV890104MWR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV890104MWR2G 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 NCV890104MWR2G reliable?
The price and inventory of NCV890104MWR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV890104MWR2G is usually 5 days.
3.What payment methods are accepted for NCV890104MWR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV890104MWR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV890104MWR2G?
NCV890104MWR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV890104MWR2G 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 NCV890104MWR2G?
For technical support, including NCV890104MWR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV890104MWR2G requirements.
6.How does Aetrix verify that NCV890104MWR2G is sourced from the original manufacturer or authorized distributors?
All NCV890104MWR2G 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 NCV890104MWR2G meets industry standards.
7.What is the process for return or replacement of NCV890104MWR2G?
All NCV890104MWR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV890104MWR2G, 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 NCV890104MWR2G part is unused and in its original packaging.
Return procedure for NCV890104MWR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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