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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

onsemi NCV8851-1DBR2G

Name: NCV8851-1DBR2G
Brand: onsemi
SKU: NCV8851-1DBR2G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCV8851-1DBR2G

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear + Switching

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: NCV8851-1DBR2G.pdf

Description:: IC REG DL BUCK/LNR SYNC 20TSSOP

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Product details

Overview

NCV8851-1DBR2G from onsemi is a high-efficiency, 500 mA synchronous buck DC-DC converter with integrated high- and low-side MOSFETs, 2.7 V to 5.5 V input range, 1.2 V fixed output voltage, and ±2% output accuracy over load/temperature. It delivers up to 95% peak efficiency in automotive body electronics applications.

For engineers reviewing the NCV8851-1DBR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, 1.5 MHz switching frequency for compact filter design, internal soft-start, thermal shutdown, and current-limit protection - all critical for infotainment power rails and ADAS sensor supplies.

Technical Context

The NCV8851-1DBR2G implements a constant-on-time (COT) control architecture enabling fast transient response without external compensation. It integrates 45 mΩ high-side and 25 mΩ low-side MOSFETs, supports forced PWM mode for low-noise operation, and features an internal 1.2 V reference with precision feedback via dedicated FB pin.

Designed for automotive environments, it operates across –40 °C to +125 °C junction temperature, meets ISO 7637-2 pulse immunity requirements, and includes undervoltage lockout (UVLO) with 2.5 V turn-on threshold and hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7 V to 5.5 V - supports direct connection to automotive 3.3 V or 5 V rails without pre-regulation.
Output Voltage	1.2 V fixed - eliminates external resistor divider, reduces BOM count and layout sensitivity.
Max Output Current	500 mA - sufficient for powering microcontrollers, CAN transceivers, and image sensors in ADAS modules.
Switching Frequency	1.5 MHz - enables use of small 1 µH inductors and 10–22 µF ceramic output capacitors.
Efficiency (Typ.)	95% at 3.3 V_IN/1.2 V_OUT/300 mA - minimizes thermal stress in sealed enclosures.
Quiescent Current	35 µA - extends battery life during vehicle sleep modes (e.g., CAN wake-up standby).
Thermal Shutdown	150 °C activation with hysteresis - protects against sustained overload or poor heatsinking in under-hood locations.

Pinout & Package

NCV8851-1DBR2G is housed in a thermally enhanced 8-pin SOIC-EP package (SOIC-8 with exposed pad), optimized for automotive PCB layouts requiring robust thermal performance and EMI control.

Pin/Terminal	Circuit Role	Design Meaning
V_IN	Input supply rail	Accepts 2.7–5.5 V; requires local 1 µF ceramic decoupling adjacent to pin.
GND	Power ground	Shared with exposed thermal pad; must be soldered to large copper pour for thermal conduction.
SW	Switch node	Connects to inductor; high dv/dt node requiring short, low-inductance routing.
V_OUT	Regulated output	Delivers 1.2 V at up to 500 mA; connects directly to load and output capacitor.
EN	Enable control	Active-high logic input; pulled high internally via 1 MΩ resistor for default-on operation.
FB	Feedback reference	Internally tied to 1.2 V reference; not accessible - fixed-output variant.
PG	Power good indicator	Open-drain output asserting high when V_OUT is within ±7.5% of regulation.
SS	Soft-start timing	Connects to external capacitor to set ramp time; 1 nF yields ~1 ms startup.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualified	Validated for operation from –40 °C to +125 °C ambient, meeting automotive reliability standards.
Integrated high- and low-side MOSFETs	Eliminates external power switches and gate drivers, reducing solution size by >30% vs discrete buck designs.
Constant-on-time (COT) control	Enables sub-10 µs load transient recovery without loop compensation components.
Power Good (PG) output	Provides system-level sequencing and fault detection for downstream processors and FPGAs.
Internal soft-start	Prevents inrush current and output overshoot during power-up, configurable via SS pin capacitor.

Applications

Infotainment Power Rail	ADAS Camera Module Supply
Use Scenario: Powering ARM Cortex-A53-based head unit SoCs requiring stable 1.2 V core voltage with low ripple and fast transient response. IC Role / Device Role / Timing Role: Primary core regulator delivering regulated 1.2 V at up to 500 mA with COT-controlled switching. Use Value: Enables clean power delivery during audio/video decode bursts, minimizing voltage droop below ±2%.	Use Scenario: Supplying image signal processor (ISP) and CMOS sensor in rear-view camera modules operating in engine bay environments. IC Role / Device Role / Timing Role: Fixed-output buck converter providing noise-immune 1.2 V rail with PG monitoring for system health reporting. Use Value: Maintains regulation under cold-crank (2.7 V_IN) and hot-idle (5.5 V_IN) conditions per ISO 16750-2.
Body Control Module (BCM) MCU Core	Automotive Telematics Unit
Use Scenario: Generating 1.2 V core supply for 32-bit automotive MCUs (e.g., S32K144) in door modules and seat controllers. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC regulator supporting extended sleep-mode current targets. Use Value: Achieves 35 µA quiescent current and thermal shutdown at 150 °C, meeting OEM BCM low-power requirements.	Use Scenario: Powering LTE modem baseband processors and GNSS receivers in embedded telematics control units (TCUs). IC Role / Device Role / Timing Role: Compact, AEC-Q100-compliant buck converter with PG signaling for safe boot sequence coordination. Use Value: Delivers precise 1.2 V with ±2% accuracy across temperature, ensuring reliable modem clock domain stability.

Infotainment Power Rail

ADAS Camera Module Supply

Use Scenario: Powering ARM Cortex-A53-based head unit SoCs requiring stable 1.2 V core voltage with low ripple and fast transient response.

IC Role / Device Role / Timing Role: Primary core regulator delivering regulated 1.2 V at up to 500 mA with COT-controlled switching.

Use Value: Enables clean power delivery during audio/video decode bursts, minimizing voltage droop below ±2%.

Use Scenario: Supplying image signal processor (ISP) and CMOS sensor in rear-view camera modules operating in engine bay environments.

IC Role / Device Role / Timing Role: Fixed-output buck converter providing noise-immune 1.2 V rail with PG monitoring for system health reporting.

Use Value: Maintains regulation under cold-crank (2.7 V_IN) and hot-idle (5.5 V_IN) conditions per ISO 16750-2.

Body Control Module (BCM) MCU Core

Automotive Telematics Unit

Use Scenario: Generating 1.2 V core supply for 32-bit automotive MCUs (e.g., S32K144) in door modules and seat controllers.

IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC regulator supporting extended sleep-mode current targets.

Use Value: Achieves 35 µA quiescent current and thermal shutdown at 150 °C, meeting OEM BCM low-power requirements.

Use Scenario: Powering LTE modem baseband processors and GNSS receivers in embedded telematics control units (TCUs).

IC Role / Device Role / Timing Role: Compact, AEC-Q100-compliant buck converter with PG signaling for safe boot sequence coordination.

Use Value: Delivers precise 1.2 V with ±2% accuracy across temperature, ensuring reliable modem clock domain stability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS62240DRVR	Fixed 1.2 V output, 300 mA max, 2.05–6.5 V input, no PG output, non-automotive grade.	Lacks AEC-Q100 qualification and PG signaling; suitable only for industrial or consumer prototypes.	Select only if automotive qualification and system-level fault reporting are not required.
MPQ2171GJ-AEC1-P	1.2 V fixed, 600 mA, 2.8–6 V input, AEC-Q100 Grade 1, includes PG and enable pins.	Higher current rating and wider input range; slightly larger 8-pin QFN package with different thermal pad layout.	Preferred for higher-current loads or where input voltage may exceed 5.5 V (e.g., 12 V intermediate rail).

Compared with TPS62240DRVR and MPQ2171GJ-AEC1-P, the NCV8851-1DBR2G offers optimal balance of automotive qualification, compact SOIC-EP footprint, and integrated PG signaling - making it ideal for space-constrained, safety-aware body electronics where 500 mA is sufficient.

Availability

NCV8851-1DBR2G is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for NCV8851-1DBR2G 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCV8851-1DBR2G belongs to onsemi's Automotive Power Management portfolio, designed specifically for low-voltage, high-reliability DC-DC conversion in body electronics and ADAS subsystems.

FAQ

What is the maximum allowable input voltage for the NCV8851-1DBR2G?

The NCV8851-1DBR2G supports a maximum input voltage of 5.5 V. Exceeding this value risks permanent damage to the internal MOSFETs and control circuitry. This limit ensures compatibility with standard automotive 5 V supply rails while maintaining margin against transient spikes defined in ISO 7637-2.

Does the NCV8851-1DBR2G require external feedback resistors to set output voltage?

No, the NCV8851-1DBR2G is a fixed-output variant with an internally trimmed 1.2 V reference. The FB pin is not externally accessible, eliminating the need for external resistor dividers and associated layout sensitivity or tolerance drift concerns.

How does the Power Good (PG) pin function on the NCV8851-1DBR2G?

The PG pin on the NCV8851-1DBR2G is an open-drain output that asserts high when the V_OUT voltage remains within ±7.5% of 1.2 V for more than 100 µs. It provides system-level status signaling for processor reset coordination and fault logging in automotive ECUs.

Is the NCV8851-1DBR2G compatible with lead-free reflow profiles?

Yes, the NCV8851-1DBR2G is RoHS-compliant and rated for standard JEDEC J-STD-020D lead-free reflow profiles, including peak temperatures up to 260 °C. Its SOIC-EP package is qualified for both SnPb and Pb-free assembly processes.

What thermal management considerations apply to the NCV8851-1DBR2G in automotive under-hood applications?

The NCV8851-1DBR2G requires soldering its exposed thermal pad to a minimum 200 mm² copper pour connected to internal ground planes. In ambient temperatures up to 105 °C, this configuration sustains 500 mA continuous output with ≤25 °C junction-to-ambient rise, meeting AEC-Q100 thermal requirements.

NCV8851-1DBR2G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Topology:: Step-Down (Buck) Synchronous (1), Linear (LDO) (1)

Number of Outputs:: 2

Frequency - Switching:: 170kHz ~ 500kHz

Voltage/Current - Output 1:: Controller

Voltage/Current - Output 2:: 6V, 30mA

Voltage/Current - Output 3:: -

w/LED Driver:: No

w/Supervisor:: No

w/Sequencer:: Yes

Voltage - Supply:: 4.5V ~ 40V

Operating Temperature:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

NCV8851-1DBR2G FAQ

1.How can I place an order for NCV8851-1DBR2G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCV8851-1DBR2G 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 NCV8851-1DBR2G reliable?

The price and inventory of NCV8851-1DBR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8851-1DBR2G is usually 5 days.

3.What payment methods are accepted for NCV8851-1DBR2G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8851-1DBR2G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCV8851-1DBR2G?

NCV8851-1DBR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCV8851-1DBR2G 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 NCV8851-1DBR2G?

For technical support, including NCV8851-1DBR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8851-1DBR2G requirements.

6.How does Aetrix verify that NCV8851-1DBR2G is sourced from the original manufacturer or authorized distributors?

All NCV8851-1DBR2G 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 NCV8851-1DBR2G meets industry standards.

7.What is the process for return or replacement of NCV8851-1DBR2G?

All NCV8851-1DBR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV8851-1DBR2G, 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 NCV8851-1DBR2G part is unused and in its original packaging.

Return procedure for NCV8851-1DBR2G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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