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onsemi NCV8843PWG
- Part No.:
- NCV8843PWG
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
NCV8843PWG.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,923
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Product details
Overview
The NCV8843PWG from onsemi is a synchronous buck regulator IC delivering 1.5 A output current at a fixed 340 kHz switching frequency, featuring V² control architecture for ultra-fast transient response and simplified loop compensation. 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 - designed for automotive 12 V/24 V systems requiring robust load dump tolerance.
For engineers reviewing the NCV8843PWG datasheet, pinout, applications, or equivalent options, key selection considerations include its SO-16W EPAD package with exposed thermal pad, SYNC capability for noise-sensitive multi-rail systems, SHDNB active-low power-down control, and VFB-triggered foldback protection under short-circuit conditions.
Technical Context
The NCV8843PWG implements proprietary V² control, using output voltage ripple as the ramp signal for PWM comparison - enabling instantaneous duty-cycle modulation independent of error amplifier bandwidth. Its transconductance error amplifier (6.4 mA/V) drives the VC pin, with internal 1.27 V reference (±2.0%) and 500 kHz unity-gain bandwidth.
Switching is governed by a factory-trimmed oscillator (306–374 kHz), with frequency foldback to ≤85 kHz when VFB drops below 0.29 V, reducing power dissipation during overload. The BOOST pin supplies base current to the integrated NPN switch, requiring external bootstrap capacitor/diode to maintain saturation voltage ≤0.7 V at 1.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A continuous - supports automotive infotainment and ADAS ECUs without external pass devices. |
| Input Voltage Range | 4.0 V to 40 V - withstands 31 V load dump transients per ISO 7637-2, suitable for 12 V/24 V vehicle batteries. |
| Switching Frequency | 340 kHz (±10%) - enables compact magnetics (e.g., 18 µH inductor) and reduces EMI compared to lower-frequency alternatives. |
| VFB Foldback Threshold | 0.29–0.36 V - triggers frequency reduction and current limit foldback to protect IC and external components during short circuit. |
| Saturation Voltage | 0.7 V max at 1.5 A - minimizes conduction loss and die temperature rise when BOOST is properly biased. |
| Shutdown Quiescent Current | 1.0 µA - ensures <1 µA system standby draw when SHDNB is pulled low, critical for always-on automotive modules. |
| Thermal Shutdown Trip | 175–195 °C - provides fail-safe junction protection with 42 °C hysteresis to prevent thermal cycling. |
Pinout & Package
NCV8843PWG is housed in a SO-16W EPAD (Case 751AG) package with exposed thermal pad (internally connected to GND), offering 16°C/W junction-to-case thermal resistance for high-power-density automotive layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply for NPN base drive | Enables saturated switch operation; requires external 0.1 µF capacitor + diode to VIN or VOUT to maintain ≥2.5 V headroom above VSW. |
| VIN (Pin 2) | Main power input | Accepts 4–40 V DC; handles 45 V peak transient; supplies internal LDO and pre-driver circuits. |
| VSW (Pin 3) | Switch emitter node | Connects to inductor; swings to −1.0 V (50 ns max) during flyback; requires short PCB trace to minimize EMI. |
| SHDNB (Pin 4) | Active-low enable control | Pulled low (<1.0 V) disables switching and reduces quiescent current to 1.0 µA; internal pull-down present. |
| SYNC (Pin 5) | External clock synchronization input | Accepts 377–710 kHz TTL-compatible signal; disables foldback during sync mode; 60 kΩ internal pull-down. |
| GND (Pin 6) | Power return | Primary ground reference for all analog and power circuits; EPAD must be soldered to PCB ground plane. |
| VFB (Pin 7) | Error amplifier inverting input | Monitors output via resistor divider; 0.29 V threshold initiates foldback; bias current <0.1 µA enables high-impedance feedback networks. |
| VC (Pin 8) | Error amplifier output / PWM comparator input | Provides access to compensation node; clamped to 1.53 V max; 0.1 µF capacitor to GND sets soft-start and stability. |
| NC (Pins 9–15) | No connection | Unbonded pads; no electrical function; must remain unconnected per datasheet. |
| EPAD | Exposed thermal pad | Internally tied to GND; mandatory solder connection to PCB thermal plane for thermal performance and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Eliminates need for complex compensation networks; achieves <10 µs load transient recovery without external RC networks. |
| Frequency Foldback | Reduces switching frequency to ≤85 kHz and current limit to 1.5 A during short circuit, cutting IC power dissipation by >60%. |
| BOOST Pin Bootstrapping | Enables <0.7 V saturation voltage at full 1.5 A load, improving efficiency by ~3% over non-bootstrapped designs. |
| Automotive Qualification | NCV prefix indicates AEC-Q100 Grade 1 compliance (−40 °C to +125 °C ambient), with change control and PPAP support. |
| Soft-Start via VC Pin | Uses internal error amplifier source current (25 µA typ) charging external 0.1 µF capacitor to achieve >5 ms controlled output ramp-up. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Regulating 12 V battery to 3.3 V for microcontroller, CAN transceiver, and sensor interface circuits in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary synchronous buck converter providing stable, low-noise 3.3 V rail with load dump immunity and thermal fault protection. Use Value: Eliminates need for external MOSFET and gate driver; 1.5 A rating supports multiple peripherals; SYNC pin allows alignment with system clock to reduce beat frequencies. | Use Scenario: Generating 5 V from 24 V industrial bus to power isolated digital I/O drivers and fieldbus interface ICs in harsh factory environments. IC Role / Device Role / Timing Role: Fixed-frequency buck controller with wide input range and robust overcurrent protection for DIN-rail mounted programmable logic controllers. Use Value: 40 V absolute max input withstands 24 V system surges; thermal shutdown prevents latch-up during ambient temperature excursions; exposed pad ensures reliable operation at 70 °C ambient. |
| Automotive Infotainment Display Power | Telematics Cellular Modem Supply |
Use Scenario: Converting 12 V vehicle supply to 1.8 V for LCD timing controller and display memory in center-stack displays. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with fast transient response to handle burst-mode GPU and video processing loads. Use Value: V² control delivers <15 mV output deviation during 1 A load steps; BOOST pin maintains efficiency >88% across 100 mA–1.5 A load range. | Use Scenario: Providing 3.3 V power to LTE/5G cellular modems in vehicle telematics units, where RF noise must be minimized during data transmission. IC Role / Device Role / Timing Role: Synchronized buck regulator operating at externally locked 443 kHz to avoid interference with cellular band harmonics. Use Value: SYNC pin enables precise frequency alignment; SO-16W EPAD package supports tight layout for EMI filtering; shutdown current <1 µA extends battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-3.3/NOPB | Non-synchronous, 5 A, 260 kHz, no BOOST pin or V² control; higher dropout and slower transient response. | Lacks automotive qualification; no load dump tolerance or SYNC capability; requires external Schottky diode. | Choose only for cost-sensitive non-automotive 3.3 V supplies where efficiency >90% is not required. |
| MPQ4420AGL-A-Z | Synchronous, 2 A, 500 kHz, current-mode control, no V² architecture; different compensation scheme and no frequency foldback. | Industrial-grade only (no NCV prefix); lacks AEC-Q100 qualification and 40 V input rating; smaller DFN package limits thermal headroom. | Select for higher-frequency, space-constrained designs where automotive qualification is unnecessary and 500 kHz EMI profile is acceptable. |
Compared with LM2678SD-3.3/NOPB and MPQ4420AGL-A-Z, the NCV8843PWG uniquely combines automotive qualification, V² control for sub-10 µs transients, and integrated BOOST-driven NPN switch - making it the only option among the three qualified for safety-critical 12 V/24 V vehicle subsystems with stringent thermal and transient requirements.
Availability
NCV8843PWG is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telematics modules, and infotainment display power supplies requiring stable component supply across extended temperature and load dump conditions.
Supply support for NCV8843PWG 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 NCV8843PWG belongs to onsemi's automotive-grade power management IC portfolio, engineered specifically for robust DC-DC conversion in vehicles - emphasizing load dump resilience, thermal reliability, and functional safety readiness.
FAQ
What is the maximum input voltage the NCV8843PWG can withstand during load dump events?
The NCV8843PWG is rated for 45 V peak transient voltage under 31 V load dump conditions at VIN = 14 V, as specified in the Absolute Maximum Ratings table. This exceeds ISO 7637-2 Pulse 5a requirements for 12 V automotive systems, ensuring reliable operation without external TVS clamping in most vehicle architectures. The device remains functional up to 40 V DC continuously, with internal protection preventing latch-up or damage during validated transients.
How does the BOOST pin on the NCV8843PWG improve efficiency compared to standard buck controllers?
The BOOST pin on the NCV8843PWG supplies elevated base drive to the integrated NPN power transistor, maintaining saturation voltage ≤0.7 V at 1.5 A output current. This reduces conduction losses by up to 35% versus non-bootstrapped designs, directly increasing efficiency - especially at high duty cycles and elevated temperatures. External bootstrap capacitor and diode (e.g., 0.1 µF + 1N4148) are required to generate the VIN + VO voltage needed for optimal biasing.
Can the NCV8843PWG be synchronized to an external clock, and what is the valid frequency range?
Yes, the NCV8843PWG supports external synchronization via its SYNC pin, accepting TTL-compatible signals from 377 kHz to 710 kHz. The internal 60 kΩ pull-down resistor allows floating operation if unused. During sync mode, the oscillator locks to the external clock edge, disabling frequency foldback and enabling precise EMI management - critical for automotive infotainment systems co-located with RF receivers.
What happens to the NCV8843PWG during a short-circuit condition at the output?
When VFB drops below 0.29 V, the NCV8843PWG activates dual protection: switching frequency folds back to ≤85 kHz (≤25% of nominal) and peak current limit reduces to 1.5 A (foldback current). This cuts power dissipation in the IC and external components by >60%, prevents thermal runaway, and limits inductor/diode stress. Recovery is automatic once VFB rises above 0.36 V, with soft-start behavior preventing output overshoot.
Is the NCV8843PWG pin-compatible with other packages in the NCV8843 family, such as DFN18 or SO-8?
No, the NCV8843PWG (SO-16W EPAD) is not pin-compatible with the DFN18 or SO-8 variants. Pin counts differ (16 vs. 18 vs. 8), terminal assignments vary significantly (e.g., VSW appears on Pin 3 in SO-16W but Pin 4 in SO-8), and thermal pad configuration is unique to the SO-16W EPAD package. PCB layout and schematic must be redesigned for each package; no mechanical or electrical interchangeability exists between NCV8843 variants.
NCV8843PWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width) Exposed Pad
- 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:
- 16-SOIC
NCV8843PWG FAQ
1.How can I place an order for NCV8843PWG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8843PWG 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 NCV8843PWG reliable?
The price and inventory of NCV8843PWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8843PWG is usually 5 days.
3.What payment methods are accepted for NCV8843PWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8843PWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8843PWG?
NCV8843PWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8843PWG 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 NCV8843PWG?
For technical support, including NCV8843PWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8843PWG requirements.
6.How does Aetrix verify that NCV8843PWG is sourced from the original manufacturer or authorized distributors?
All NCV8843PWG 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 NCV8843PWG meets industry standards.
7.What is the process for return or replacement of NCV8843PWG?
All NCV8843PWG units undergo pre-shipment inspection (PSI). If there is an issue with NCV8843PWG, 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 NCV8843PWG part is unused and in its original packaging.
Return procedure for NCV8843PWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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