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onsemi NCV8843DG
- Part No.:
- NCV8843DG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCV8843DG.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
NCV8843DG from onsemi is an automotive-grade synchronous buck regulator IC delivering 1.5 A output current at a fixed 340 kHz switching frequency using V² control architecture. It operates from 4.0 V to 40 V input, integrates an on-chip NPN power switch with BOOST pin for bootstrapped gate drive, and includes thermal shutdown, cycle-by-cycle current limiting, and frequency foldback for short-circuit protection. It is used in 12 V/24 V automotive power supplies converting to 3.3 V or 5 V rails.
For engineers reviewing the NCV8843DG datasheet, pinout, applications, or equivalent options, key selection considerations include its V² control loop's ultra-fast transient response, SYNC capability for noise-sensitive systems, exposed-thermal-pad SO-16W EP package, and automotive qualification (AEC-Q100 Grade 1, −40 °C to +150 °C TJ).
Technical Context
The NCV8843DG implements onsemi's proprietary V² control architecture, where the output voltage ripple serves as the ramp signal for PWM comparison-enabling instantaneous duty-cycle modulation without error amplifier bandwidth limitations. This yields sub-100 ns load transient recovery and eliminates complex external compensation networks.
It integrates a high-current NPN power switch with saturation voltage ≤0.7 V at 1.5 A, driven via the BOOST pin to ensure deep saturation and minimize conduction loss. Protection features include programmable frequency foldback (to ≤85 kHz) and current limit foldback (to ~1.5 A) triggered when VFB falls below 0.32 V, plus thermal shutdown at 185 °C with 42 °C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A continuous - supports mid-power automotive ECUs, ADAS sensors, and infotainment subsystems without external MOSFETs. |
| Input Voltage Range | 4.0 V to 40 V - accommodates cold-crank (≥3.5 V startup), 12 V/24 V systems, and 31 V load-dump transients (45 V peak rating). |
| Switching Frequency | 340 kHz ±10% - enables compact magnetics (e.g., 18 µH inductor) and balances EMI vs. efficiency; sync-capable up to 710 kHz. |
| V² Control Architecture | Uses output ripple as native ramp - delivers <10 µs load-step response and eliminates need for Type II/III compensation networks. |
| Reference Voltage Accuracy | 1.270 V ±1.1% - ensures tight output regulation (e.g., 3.3 V ±20 mV with standard resistor divider) across temperature and line. |
| Thermal Protection | 185 °C trip with 42 °C hysteresis - prevents latch-up during sustained overload and enables safe auto-recovery after cooling. |
| Shutdown Quiescent Current | 1.0 µA typical - meets automotive "off-state" leakage requirements for always-on modules (e.g., CAN wake-up receivers). |
Pinout & Package
NCV8843DG is packaged in SO-16W EP (Case 751AG), featuring an exposed thermal pad (EPAD) internally connected to GND for enhanced heat dissipation (RJC = 16 °C/W). The 16-pin layout supports full functionality including BOOST, SYNC, SHDNB, and VC loop compensation access.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 / BOOST | Bootstrap supply for NPN base drive | Enables saturated switch operation; requires 0.1 µF capacitor to VIN to maintain ≥2.5 V headroom and reduce on-resistance. |
| 2 / VIN | Main power input (4–40 V) | Supplies internal LDO, oscillator, and logic; handles 45 V transient peaks; must be decoupled with low-ESR ceramic capacitor. |
| 3 / VSW | Switch node (NPN emitter) | Connects to inductor; swings negative to −1.0 V (50 ns); requires short, low-inductance trace to minimize EMI and diode stress. |
| 4 / SHDNB | Active-low shutdown control | Pulled low ≤1.0 V to enter 1.0 µA sleep mode; internal pull-down; requires 100 kΩ pull-up for robust 12 V/24 V compatibility. |
| 5 / SYNC | External clock synchronization input | Accepts TTL-compatible rising-edge pulses (377–710 kHz); disables foldback during sync; 60 kΩ internal pull-down. |
| 6 / GND | Power ground reference | Primary return path; EPAD must be soldered to PCB ground plane for thermal and noise performance. |
| 7 / VFB | Error amplifier inverting input | Senses output via resistor divider; voltage <0.29 V triggers frequency/current foldback for short-circuit protection. |
| 8 / VC | Error amplifier output / PWM comparator input | Provides direct access to loop compensation node; 0.1 µF to GND sets soft-start time (>5 ms) and dominant pole. |
| 9–14 / NC | No connection | Unused pins; must remain unconnected per datasheet to avoid parasitic coupling or latch-up risk. |
| 15–16 / NC | No connection | Unused pins; no internal connection; leave floating or grounded only if required by board layout constraints. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Eliminates external compensation components and delivers <10 µs load transient recovery - critical for automotive microcontroller core rails. |
| BOOST Pin Bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting conduction loss by >30% vs. non-bootstrapped designs and enabling higher efficiency at 12 V input. |
| SYNC Input (377–710 kHz) | Allows deterministic EMI placement away from sensitive bands (e.g., AM radio) and enables parallel operation of multiple converters without beat frequencies. |
| Frequency & Current Foldback | Under short circuit, switches to ≤85 kHz and limits peak current to ~1.5 A - reducing IC power dissipation by >60% and preventing thermal runaway. |
| Automotive Qualification | AEC-Q100 Grade 1 (−40 °C to +150 °C TJ) and Pb-free SO-16W EP package - qualified for engine bay, transmission, and ADAS applications. |
Applications
| Automotive Body Control Module (BCM) | Advanced Driver Assistance Systems (ADAS) Camera Power |
|---|---|
|
Use Scenario: Stable 3.3 V supply for microcontroller, CAN transceiver, and sensor interface in door module or lighting controller under 12 V battery with load dump. IC Role / Device Role / Timing Role: Primary DC-DC converter regulating from 7–16 V battery to 3.3 V; provides fast transient response to MCU wake-up events. Use Value: V² control ensures <10 µs recovery from 500 mA load steps, preventing brownout resets; 40 V absolute max rating withstands 31 V load dump. |
Use Scenario: Compact 5 V rail for CMOS image sensor and ISP in rear-view or surround-view camera, operating in hot under-hood environment. IC Role / Device Role / Timing Role: Synchronous buck regulator with thermal shutdown and foldback, mounted on small flex-rigid PCB near sensor. Use Value: Exposed pad SO-16W EP achieves RJA = 35 °C/W on 4-layer board, sustaining 1.5 A at +105 °C ambient; SYNC input avoids EMI interference with image data lines. |
| Automotive Infotainment Display Backlight | Electric Power Steering (EPS) Motor Control Logic Supply |
|
Use Scenario: 5 V supply for display timing controller and touch controller in center-stack display, subject to ignition cycling and RF noise. IC Role / Device Role / Timing Role: Main system rail regulator with SHDNB-controlled power sequencing and soft-start to prevent inrush into large display capacitors. Use Value: Built-in soft-start (via VC pin) ramps output over >5 ms, limiting inrush to <1.2 A; shutdown quiescent current of 1.0 µA supports low-power display standby. |
Use Scenario: 5 V logic supply for EPS motor gate drivers and position sensing circuitry, requiring fault resilience during motor stall or short. IC Role / Device Role / Timing Role: Protected power source with foldback current limit and thermal shutdown, feeding isolated gate driver ICs and ASIL-B logic. Use Value: Foldback reduces short-circuit current to ~1.5 A and frequency to ≤85 kHz - limiting junction temperature rise to <35 °C during 5 s stall, avoiding system shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 40 V input, 0.6 A, 1 MHz, current-mode control; no integrated NPN; requires external high-side MOSFET. | Better suited for space-constrained, high-frequency designs needing >1 MHz switching; lacks V² speed and single-chip simplicity. | Select when higher frequency (1 MHz) and external FET flexibility outweigh need for integrated switch and ultra-fast transient response. |
| MPQ4420AGL-AEC1 | 40 V input, 2 A, 500 kHz, current-mode control; integrated MOSFETs; no BOOST pin or V² architecture. | Higher current and dual-MOSFET integration suit higher-power loads; slower transient response (~50 µs) than NCV8843DG's V² loop. | Choose for 2 A output needs and simpler layout (no BOOST cap), accepting longer transient recovery and less precise light-load regulation. |
Compared with LM5164QPWPRQ1 and MPQ4420AGL-AEC1, the NCV8843DG uniquely combines integrated NPN switching, V² control for sub-10 µs transients, BOOST-driven saturation, and automotive-grade thermal protection in a single SO-16W EP package - making it optimal for cost-sensitive, reliability-critical 1.5 A automotive rails where dynamic performance is paramount.
Availability
NCV8843DG is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power supplies, and infotainment display subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for NCV8843DG 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, with leadership in power management, analog, and intelligent sensing.
The NCV8843DG belongs to onsemi's automotive-qualified DC-DC regulator family, designed specifically for robust, high-transient-performance power conversion in engine bay, chassis, and ADAS environments where reliability under voltage transients and thermal stress is non-negotiable.
FAQ
What is the maximum input voltage the NCV8843DG can withstand during load dump conditions?
The NCV8843DG is rated for a peak transient voltage of 45 V under 31 V load dump conditions at VIN = 14 V, as specified in the Absolute Maximum Ratings table. Its 40 V DC operating limit and robust internal protection allow reliable operation in automotive 12 V systems subjected to ISO 7637-2 Pulse 5a transients, provided proper input filtering is implemented per the datasheet guidelines.
Does the NCV8843DG require an external bootstrap capacitor, and what value is recommended?
Yes, the NCV8843DG requires an external 0.1 µF ceramic capacitor between the BOOST and VIN pins to ensure sufficient gate drive voltage for the integrated NPN transistor. This capacitor maintains ≥2.5 V headroom above VIN during switch conduction, minimizing saturation voltage and conduction losses. A X7R dielectric with 10 V rating and low ESL is recommended for stable operation across temperature.
How does the V² control architecture in the NCV8843DG improve transient response compared to traditional voltage-mode controllers?
The NCV8843DG's V² control uses the output ripple voltage directly as the PWM ramp signal, enabling immediate duty-cycle adjustment to load or line changes without waiting for the error amplifier to respond. This results in <10 µs transient recovery-up to 10× faster than conventional voltage-mode controllers-while eliminating the need for complex Type III compensation networks and improving stability across wide output capacitor ESR ranges.
Can the NCV8843DG be synchronized to an external clock, and what is the supported frequency range?
Yes, the NCV8843DG supports external synchronization via its SYNC pin, accepting TTL-compatible rising-edge clock signals from 377 kHz to 710 kHz. During sync operation, the internal oscillator is disabled, frequency foldback is suppressed, and switching is precisely aligned to the external clock-enabling EMI reduction, multi-phase interleaving, and deterministic noise placement in sensitive automotive systems.
What thermal derating guidance applies to the NCV8843DG in SO-16W EP package at +105 °C ambient?
In a standard 4-layer PCB with 1 oz copper, the NCV8843DG's SO-16W EP package has RJA = 35 °C/W. At +105 °C ambient and 150 °C max junction temperature, the allowable power dissipation is (150 − 105)/35 ≈ 1.29 W. Accounting for typical losses (e.g., 0.8 W at 1.5 A, 12 V input), the device sustains full 1.5 A output at +105 °C ambient with adequate copper area and EPAD soldering.
NCV8843DG 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:
- 340kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
NCV8843DG FAQ
1.How can I place an order for NCV8843DG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8843DG 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 NCV8843DG reliable?
The price and inventory of NCV8843DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8843DG is usually 5 days.
3.What payment methods are accepted for NCV8843DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8843DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8843DG?
NCV8843DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8843DG 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 NCV8843DG?
For technical support, including NCV8843DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8843DG requirements.
6.How does Aetrix verify that NCV8843DG is sourced from the original manufacturer or authorized distributors?
All NCV8843DG 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 NCV8843DG meets industry standards.
7.What is the process for return or replacement of NCV8843DG?
All NCV8843DG units undergo pre-shipment inspection (PSI). If there is an issue with NCV8843DG, 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 NCV8843DG part is unused and in its original packaging.
Return procedure for NCV8843DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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