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onsemi NCV8843DR2G
- Part No.:
- NCV8843DR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCV8843DR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,414
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Product details
Overview
NCV8843DR2G 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 NPN power switch with BOOST pin for bootstrapped gate drive, and features thermal shutdown, cycle-by-cycle current limiting, and frequency foldback for short-circuit protection. It is used in automotive body control modules requiring robust 12 V–24 V DC-DC conversion.
For engineers reviewing the NCV8843DR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 340 kHz fixed-frequency operation, 0.29 V frequency foldback threshold, 1.27 V internal reference tolerance (±2.0%), SYNC capability for noise-sensitive multi-rail systems, and SO-16W EPAD package with exposed thermal pad for enhanced thermal performance.
Technical Context
The NCV8843DR2G implements onsemi's proprietary V² control architecture, where output voltage ripple serves as the ramp signal for PWM comparison-enabling ultra-fast transient response independent of error amplifier bandwidth. Its transconductance error amplifier provides 70 dB open-loop gain and 500 kHz unity-gain bandwidth, with VC pin output enabling simple compensation via a single 0.1 µF capacitor.
It integrates a high-current NPN power switch with saturation voltage ≤0.7 V at 1.5 A (with BOOST ≥ VIN + 2.5 V), cycle-by-cycle current limit (1.6–3.0 A), and foldback current (0.9–2.1 A) triggered below 0.29 V on VFB. The SYNC pin accepts external clock signals from 377 kHz to 710 kHz, disabling frequency foldback during synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 340 kHz nominal; enables compact magnetics and reduces EMI filtering burden vs. lower-frequency regulators. |
| Input Voltage Range | 4.0 V to 40 V; supports automotive cold-crank (≥4 V) and load-dump (≤45 V peak) conditions without external clamping. |
| Output Current | 1.5 A continuous; delivered by integrated NPN transistor with BOOST-assisted saturation for low conduction loss. |
| VFB Reference Voltage | 1.270 V ±2.0%; sets output voltage via resistive divider (e.g., 3.3 V with R1=100 kΩ, R2=162 kΩ). |
| Frequency Foldback Threshold | 0.29 V on VFB; triggers 4:1 frequency reduction and current foldback to limit power dissipation during short circuit. |
| Shutdown Quiescent Current | 1.0 µA typical; enables ultra-low-power sleep mode for always-on automotive subsystems. |
| Thermal Shutdown Trip | 185 °C typical; protects die under sustained overload or poor PCB thermal design. |
Pinout & Package
NCV8843DR2G is packaged in SO-16W EPAD (Case 751AG), featuring an exposed thermal pad (EPAD) internally connected to GND for enhanced heat dissipation. This thermally optimized surface-mount package supports high ambient temperature operation up to 150 °C junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Bootstrap supply for NPN base drive | Enables full saturation of internal NPN switch; requires external 0.1 µF capacitor and diode to maintain ≥2.5 V headroom above VIN. |
| VIN | Main power input | Supplies all internal circuitry and collector of NPN switch; rated for 40 V DC and 45 V transient (load dump). |
| VSW | Switch node output | Emitter of internal NPN; connects to inductor; tolerates −1.0 V flyback for <50 ns-requires catch diode clamp. |
| SHDNB | Active-low shutdown control | TTL-compatible; pulls below 1.0 V to enter 1.0 µA sleep mode; internal pull-down requires external 100 kΩ pull-up for safe operation. |
| SYNC | External clock synchronization input | Accepts 377–710 kHz TTL pulses; disables foldback during sync; 60 kΩ internal pull-down allows floating connection. |
| VFB | Feedback input to error amplifier | Compares against 1.27 V reference; voltage <0.29 V initiates foldback; bias current ≤0.1 µA minimizes divider loading. |
| VC | Error amplifier output / PWM comparator input | Provides access to compensation node; clamped to limit overcurrent recovery time; avoid external current injection >0.5 mA. |
| GND | Power ground return | Common reference for all analog and power circuits; EPAD must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Uses output ripple as PWM ramp-eliminates need for external slope compensation and delivers sub-µs transient response without complex loop tuning. |
| Automotive-Qualified NCV Prefix | Guarantees AEC-Q100 compliance, controlled change management, and extended temperature operation (−40 °C to +150 °C TJ). |
| Integrated BOOST Drive | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting conduction losses by ~30% vs. non-bootstrapped designs. |
| Short-Circuit Protection | Combines 4:1 frequency foldback and current foldback to limit IC power dissipation to safe levels during sustained output shorts. |
| Soft-Start via VC Pin | Uses error amplifier source current (25 µA typ.) charging external 0.1 µF capacitor-provides ~5 ms monotonic output ramp without extra components. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V Power Supply |
|---|---|
|
Use Scenario: Regulating 12 V/24 V battery rail to 3.3 V or 5 V for microcontrollers, CAN transceivers, and sensors in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary synchronous buck controller providing stable, low-noise output with load-dump immunity and thermal fault protection. Use Value: Eliminates need for external MOSFET driver and discrete protection circuitry-reducing BOM count by ≥4 components while meeting ISO 7637-2 pulse 5a requirements. |
Use Scenario: Converting unregulated 24 V industrial bus to 3.3 V for PLC I/O modules operating in high-temperature enclosures. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator with SYNC input to align switching with other rails and reduce beat-frequency EMI. Use Value: SO-16W EPAD package achieves ≤35 °C/W RJA on 4-layer board-enabling 1.5 A output at 85 °C ambient without heatsink. |
| Automotive Infotainment Display Power | Commercial Vehicle Telematics Unit |
|
Use Scenario: Generating 5 V from 12 V battery for LCD backlight drivers and touch controller ASICs in center-stack displays. IC Role / Device Role / Timing Role: High-efficiency buck converter with BOOST-enhanced efficiency (>92% at 1 A) and soft-start to prevent inrush into large display capacitors. Use Value: 1.0 µA shutdown current extends battery runtime during vehicle sleep mode; V² control prevents display flicker during engine cranking transients. |
Use Scenario: Powering GPS/GSM modules and microSD interfaces in telematics units subjected to wide input variation (9–32 V) and vibration. IC Role / Device Role / Timing Role: Robust DC-DC controller with thermal shutdown and cycle-by-cycle current limiting to survive harsh vehicle environments. Use Value: 40 V absolute max rating and −40 °C to +150 °C junction range ensure reliable operation across global commercial vehicle duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous 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 quiescent current (50 mA active, 50 µA shutdown). | Lacks automotive qualification and load-dump tolerance; suitable only for benign industrial environments. | Select when cost sensitivity outweighs efficiency and transient performance; requires external Schottky diode. |
| MPQ4420AGL-AEC1-Z | Synchronous, 2 A, 500 kHz, current-mode control, AEC-Q100 qualified; no frequency foldback but includes hiccup-mode OCP. | Better light-load efficiency due to forced-PWM/pulse-skipping modes; wider sync range (100 kHz–2.5 MHz). | Prefer for new designs needing higher current or tighter EMI control; requires different compensation network than NCV8843DR2G. |
Compared with LM2678SD-3.3/NOPB, NCV8843DR2G offers superior transient response and integrated NPN switch, eliminating diode losses; compared with MPQ4420AGL-AEC1-Z, it provides simpler compensation and proven V² stability in automotive BCMs but lacks programmable frequency and light-load optimization.
Availability
NCV8843DR2G is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V power supplies, and commercial vehicle telematics requiring stable component supply across extended temperature and long product lifecycles.
Supply support for NCV8843DR2G 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 electronics, with leadership in automotive, industrial, cloud, and IoT power management solutions.
The NCV8843DR2G belongs to onsemi's automotive-qualified DC-DC regulator family, designed specifically for robust, high-reliability power conversion in vehicle body electronics and infotainment systems operating under severe electrical and thermal stress.
FAQ
What is the maximum input voltage the NCV8843DR2G can withstand during automotive load dump events?
The NCV8843DR2G supports peak transient voltage up to 45 V per ISO 7637-2 Pulse 5a, verified under 31 V load dump at VIN = 14 V. Its absolute maximum VIN rating is 40 V DC, but the device survives short-duration transients beyond that limit when properly decoupled with input capacitance and layout best practices. Always verify system-level clamping with TVS diodes for full compliance.
Does the NCV8843DR2G require an external bootstrap capacitor, and what value is recommended?
Yes, the NCV8843DR2G requires an external 0.1 µF ceramic capacitor between BOOST and VSW pins to sustain sufficient gate drive for the internal NPN transistor. This capacitor must be placed adjacent to the IC with minimal trace length. A 1N4148 or 1N914 diode is also required to charge the capacitor from VIN or VOUT-ensuring BOOST voltage remains ≥ VIN + 2.5 V during switch conduction.
How does the V² control architecture in the NCV8843DR2G improve transient response compared to traditional voltage-mode controllers?
The NCV8843DR2G's V² control uses output ripple voltage directly as the PWM ramp signal-bypassing the error amplifier's bandwidth limitation. This enables immediate duty-cycle adjustment to line or load steps, achieving sub-microsecond response without external compensation components. Traditional voltage-mode controllers rely on slow error amplifier dynamics, resulting in longer recovery times and larger output excursions.
Can the NCV8843DR2G be synchronized to an external clock, and what is the valid frequency range?
Yes, the NCV8843DR2G supports external synchronization via its SYNC pin, accepting TTL-compatible clock signals from 377 kHz to 710 kHz. During sync operation, the internal oscillator is disabled, frequency foldback is suppressed, and switching is locked to the external edge-triggered input-reducing beat-frequency noise in multi-rail systems. The pin includes a 60 kΩ internal pull-down resistor.
What thermal considerations apply to the SO-16W EPAD package of the NCV8843DR2G in high-current operation?
The SO-16W EPAD package has RJA = 35 °C/W on a 4-layer PCB with 1 oz copper layers and 600 mm² ground area. At 1.5 A output and 12 V input, total IC power dissipation is ~0.8 W; this yields ~28 °C rise above ambient-well within the 150 °C max junction limit. Ensure the EPAD is soldered to a solid thermal pad connected to internal/external ground planes for optimal performance.
NCV8843DR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
NCV8843DR2G FAQ
1.How can I place an order for NCV8843DR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8843DR2G 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 NCV8843DR2G reliable?
The price and inventory of NCV8843DR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8843DR2G is usually 5 days.
3.What payment methods are accepted for NCV8843DR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8843DR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8843DR2G?
NCV8843DR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8843DR2G 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 NCV8843DR2G?
For technical support, including NCV8843DR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8843DR2G requirements.
6.How does Aetrix verify that NCV8843DR2G is sourced from the original manufacturer or authorized distributors?
All NCV8843DR2G 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 NCV8843DR2G meets industry standards.
7.What is the process for return or replacement of NCV8843DR2G?
All NCV8843DR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV8843DR2G, 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 NCV8843DR2G part is unused and in its original packaging.
Return procedure for NCV8843DR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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