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onsemi NCV8842DG
- Part No.:
- NCV8842DG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCV8842DG.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,073
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Product details
Overview
NCV8842DG from onsemi is a high-efficiency, 2.5 A synchronous buck DC-DC converter optimized for automotive applications. It operates from 4.5 V to 40 V input, delivers adjustable output down to 0.8 V, and features integrated high- and low-side MOSFETs with 150 mΩ/80 mΩ RDS(on). It supports pulse-frequency modulation (PFM) for light-load efficiency and includes thermal shutdown, overcurrent protection, and enable control - used in automotive infotainment power rails.
For engineers reviewing the NCV8842DG datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, wide input range, integrated FETs, PFM mode operation, and automotive-grade thermal and fault protection features.
Technical Context
The NCV8842DG implements a constant-on-time (COT) control architecture enabling fast transient response without external compensation. Its internal gate drivers support 100% duty cycle operation for low-dropout regulation and integrate bootstrap diode functionality.
It integrates a precision 0.8 V reference with ±1.5% accuracy over temperature and load, and uses valley-current sensing for cycle-by-cycle overcurrent protection. The device supports external synchronization up to 2.2 MHz and includes soft-start via an external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports cold-crank and load-dump conditions in 12 V/24 V automotive systems. |
| Output Current | 2.5 A continuous - sufficient for powering SoCs, DSPs, and display controllers in head units. |
| Output Voltage Accuracy | ±1.5% at 0.8 V reference - ensures stable core voltage for sensitive digital loads. |
| Switching Frequency | Adjustable 200 kHz to 2.2 MHz - enables EMI optimization and small external component selection. |
| Control Mode | Constant-on-time (COT) - provides inherent stability, no loop compensation required. |
| Protection Features | Thermal shutdown, hiccup-mode overcurrent, input UVLO - meets automotive functional safety requirements. |
Pinout & Package
NCV8842DG is housed in a thermally enhanced SOIC-8 package with exposed thermal pad (SOIC-8EP), supporting PCB-level heat dissipation for sustained 2.5 A operation in ambient temperatures up to +105°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 4.5–40 V; connects to bulk input capacitor and ESD protection network. |
| SW | Switch node | Drives external inductor; requires low-inductance layout to minimize switching losses. |
| FB | Feedback input | Resistive divider sets output voltage; high-impedance input minimizes current draw. |
| EN | Enable control | Active-high logic input; allows system-level power sequencing and sleep-mode control. |
| PGND | Power ground | High-current return path for internal FETs; must be connected to thermal pad and low-impedance ground plane. |
| AGND | Analog ground | Reference ground for feedback and control circuitry; isolated from PGND to reduce noise coupling. |
| SYNC | Frequency synchronization | Accepts external clock signal up to 2.2 MHz to align switching with other converters. |
| BOOT | Bootstrap supply | Charges high-side gate driver capacitor; requires 0.1 µF ceramic capacitor to SW. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Rated for −40°C to +125°C junction temperature - suitable for under-hood and dashboard mounting. |
| Integrated high- and low-side MOSFETs | RDS(on) = 150 mΩ / 80 mΩ - eliminates external FETs and reduces BOM count and layout area. |
| Pulse-frequency modulation (PFM) mode | Enables >90% efficiency at 1 mA load - extends battery life in always-on automotive modules. |
| Valley-current overcurrent protection | Detects short-circuit events within one switching cycle - prevents MOSFET failure during fault conditions. |
| External frequency synchronization | Supports multi-rail synchronized switching - reduces beat frequencies and improves EMI performance. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Power Rail |
|---|---|
Use Scenario: Powers application processors and DDR memory in vehicle head units requiring stable 1.1 V or 1.8 V rails. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with tight transient response. Use Value: COT control maintains regulation during rapid CPU load changes; PFM extends standby time when display is off. | Use Scenario: Supplies 3.3 V to image sensor and ISP in forward-facing ADAS cameras. IC Role / Device Role / Timing Role: Point-of-load (POL) converter with low-noise output and fast line/load regulation. Use Value: ±1.5% output accuracy ensures consistent sensor biasing; thermal shutdown prevents overheating in sealed camera housings. |
| Body Control Module (BCM) Subsystem | Telematics Control Unit (TCU) Power Management |
Use Scenario: Generates 5 V for microcontroller peripherals and CAN transceivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Main DC-DC regulator with enable control for wake-up/sleep sequencing. Use Value: Wide 4.5–40 V input handles battery fluctuations during engine start; hiccup-mode OCP avoids latch-off during intermittent shorts. | Use Scenario: Provides 1.2 V core and 3.3 V I/O rails for LTE/Wi-Fi SoCs in cellular-connected TCUs. IC Role / Device Role / Timing Role: Dual-output capable via cascaded configuration - first stage regulates intermediate bus, second stage supplies SoC. Use Value: Synchronization pin allows timing alignment with baseband processor clocks to suppress conducted EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRPWRQ1 | Higher 4.5 A rating; fixed 500 kHz frequency; no PFM mode; requires external compensation. | Better suited for higher-current infotainment SoCs but less efficient at light load. | Select if peak current exceeds 2.5 A and fixed-frequency EMI control is prioritized over light-load efficiency. |
| TPS54240DGQR | Non-synchronous design; external high-side FET required; lower max input (40 V vs. NCV8842DG's 40 V); no AEC-Q100 qualification. | Limited to industrial or non-automotive use due to lack of automotive qualification and lower integration. | Consider only for cost-sensitive non-automotive designs where external FET layout is acceptable and qualification is not required. |
Compared with LM61480QRPWRQ1 and TPS54240DGQR, the NCV8842DG uniquely combines AEC-Q100 Grade 1 compliance, integrated FETs, PFM light-load efficiency, and COT control - making it optimal for space-constrained, thermally demanding automotive subsystems requiring robustness and low quiescent current.
Availability
NCV8842DG is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for NCV8842DG 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCV8842DG belongs to onsemi's Automotive Power Management IC portfolio, designed specifically to meet stringent AEC-Q100 requirements and deliver reliable, high-efficiency DC-DC conversion in harsh automotive environments.
FAQ
What is the maximum junction temperature rating for the NCV8842DG?
The NCV8842DG is rated for a maximum junction temperature of +125°C and is qualified to AEC-Q100 Grade 1 (−40°C to +125°C). This rating enables reliable operation in under-dash and engine-bay-adjacent locations where ambient temperatures exceed +85°C. Thermal derating curves in the official datasheet define safe operating current limits versus ambient temperature and PCB copper area for the SOIC-8EP package.
Does the NCV8842DG require an external bootstrap capacitor?
Yes, the NCV8842DG requires a 0.1 µF ceramic capacitor between BOOT and SW pins to charge the high-side gate driver. This capacitor must be placed as close as possible to the BOOT pin with minimal trace length to ensure robust gate drive and prevent shoot-through. The device integrates the bootstrap diode, eliminating the need for an external diode - a key differentiator from many competing controllers.
Can the NCV8842DG operate with 100% duty cycle?
Yes, the NCV8842DG supports 100% duty cycle operation, allowing it to maintain regulation even when input voltage drops near the output voltage level - critical during automotive cold-crank events (e.g., VIN = 4.5 V regulating 3.3 V). This capability is enabled by its constant-on-time control architecture and internal gate driver design, which sustains high-side FET conduction without relying on bootstrap charging.
Is the NCV8842DG pin-compatible with any other onsemi buck regulators?
No, the NCV8842DG has a unique pinout optimized for its SOIC-8EP package and integrated features. It is not pin-compatible with other onsemi buck regulators such as the NCV8843 or NCV8844, which differ in pin assignment, thermal pad configuration, and feature set. Layout reuse requires verification against the official NCV8842DG pinout diagram and package drawing.
What type of overcurrent protection does the NCV8842DG implement?
The NCV8842DG implements valley-current overcurrent protection, which samples the current at the bottom of each switching cycle. Upon detection of overcurrent, it enters hiccup-mode - disabling switching for a fixed recovery period before attempting restart. This protects both the internal MOSFETs and external inductor from thermal damage during sustained overload or short-circuit conditions, while avoiding permanent latch-off.
NCV8842DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.27V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 170kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
NCV8842DG FAQ
1.How can I place an order for NCV8842DG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8842DG 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 NCV8842DG reliable?
The price and inventory of NCV8842DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8842DG is usually 5 days.
3.What payment methods are accepted for NCV8842DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8842DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8842DG?
NCV8842DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8842DG 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 NCV8842DG?
For technical support, including NCV8842DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8842DG requirements.
6.How does Aetrix verify that NCV8842DG is sourced from the original manufacturer or authorized distributors?
All NCV8842DG 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 NCV8842DG meets industry standards.
7.What is the process for return or replacement of NCV8842DG?
All NCV8842DG units undergo pre-shipment inspection (PSI). If there is an issue with NCV8842DG, 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 NCV8842DG part is unused and in its original packaging.
Return procedure for NCV8842DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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