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onsemi NCV8843MNR2G
- Part No.:
- NCV8843MNR2G
- Manufacturer:
- onsemi
- Package:
- 18-VFDFN Exposed Pad
- Datasheet:
-
NCV8843MNR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 18DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
NCV8843MNR2G 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 NCV8843MNR2G 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 voltage tolerance (±2.0%), exposed-pad DFN18 package for thermal performance, and SYNC pin compatibility with external clocks up to 710 kHz.
Technical Context
The NCV8843MNR2G implements onsemi's proprietary V² control architecture, where output voltage ripple serves as the primary ramp signal for PWM comparison-enabling ultra-fast transient response independent of error amplifier bandwidth. Its transconductance error amplifier provides DC regulation via the VC pin, with only a 0.1 µF capacitor required for compensation.
It integrates a high-current NPN power switch biased via the BOOST pin, supporting saturation voltage as low as 0.4 V at 1.5 A when VBOOST = VIN + 2.5 V. Under fault conditions, it reduces switching frequency to ≤85 kHz and folds back current limit to 0.9–2.1 A when VFB falls below 0.29 V, minimizing power dissipation during overload or short circuit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A continuous; supports automotive loads such as ECUs and sensors without external MOSFETs. |
| Switching Frequency | 340 kHz ±10%; enables compact magnetics and predictable EMI filtering with minimal layout sensitivity. |
| Input Voltage Range | 4.0 V to 40 V; withstands automotive load dump transients up to 45 V peak, suitable for 12 V/24 V systems. |
| Reference Voltage | 1.270 V ±2.0%; ensures tight output regulation across temperature and line/load variations. |
| Frequency Foldback Threshold | 0.29 V on VFB pin; triggers 4:1 frequency reduction and current foldback to protect under short-circuit conditions. |
| Thermal Shutdown Trip | 185 °C typical; includes 42 °C hysteresis to prevent oscillation during thermal stress. |
| SYNC Input Range | 377–710 kHz; allows noise-sensitive multi-rail systems to synchronize switching and reduce beat frequencies. |
| Shutdown Quiescent Current | 1.0 µA typical; enables ultra-low-power sleep mode for always-on automotive subsystems. |
Pinout & Package
NCV8843MNR2G is packaged in a thermally enhanced 18-pin DFN (5 mm × 6 mm, 0.5 mm pitch) with exposed pad (Case 505, MN suffix). The EPAD is internally connected to GND and must be externally soldered to PCB ground plane for optimal thermal performance (RJA = 38 °C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | BOOST | Provides bootstrapped base drive to internal NPN switch; requires external 0.1 µF capacitor to maintain ≥2.5 V headroom over VSW. |
| 4–6 | VIN | Main power input (4–40 V); supplies internal LDO, oscillator, and pre-driver circuits. |
| 7–9 | VSW | Emitter node of internal NPN switch; connects to inductor; tolerates −1.0 V flyback for <50 ns. |
| 10 | SHDNB | Active-low TTL-compatible shutdown; pulls IC into 1.0 µA sleep mode when <1.0 V. |
| 13 | SYNC | External clock input with 60 kΩ internal pull-down; enables synchronization to external sources up to 710 kHz. |
| 16 | GND | Power return; tied internally to EPAD; must be connected to large copper area for thermal management. |
| 17 | VFB | Inverting input of error amplifier; 0.29 V threshold triggers foldback protection; sets output voltage via resistor divider. |
| 18 | VC | Error amplifier output; used for loop compensation and fault recovery clamping; avoid external driving. |
| 11, 12, 14, 15 | NC | No internal connection; must be left floating or grounded per layout best practices. |
| EPAD | GND | Exposed thermal pad; electrically and thermally connected to internal GND; mandatory PCB soldering for RJA compliance. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Uses output ripple as natural ramp signal-eliminates need for artificial slope compensation while enabling sub-µs transient response without complex compensation. |
| Integrated BOOST Drive | Enables full saturation of internal NPN switch at high duty cycles, reducing conduction loss and improving efficiency by >3% vs non-bootstrapped designs. |
| Frequency & Current Foldback | Simultaneously reduces switching frequency to ≤85 kHz and limits peak current to ≤2.1 A when VFB < 0.29 V-cutting short-circuit power dissipation by >70%. |
| Automotive Qualification | NCV prefix indicates AEC-Q100 Grade 1 qualification (−40 °C to +125 °C ambient), with change control and PPAP support for automotive OEMs. |
| Soft-Start via VC Pin | Uses error amplifier source current (25 µA typ.) charging external 0.1 µF capacitor-provides inherent 5 ms+ soft-start without dedicated pin or external circuitry. |
| Exposed-Pad Thermal Design | DFN18 package achieves 38 °C/W RJA on standard 4-layer board-supports 1.5 A continuous operation at +85 °C ambient without heatsink. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers 3.3 V/5 V rails for display controllers and audio codecs in vehicle head units under wide-input 9–16 V battery conditions. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating stable low-noise supply; uses SYNC pin to align switching with display pixel clock and suppress beat noise. Use Value: V² control maintains <50 mV output deviation during 2 A load transients; frequency foldback prevents thermal runaway during HDMI hot-plug events. | Use Scenario: Supplies 1.8 V/3.3 V to image sensor and ISP in rear-view or surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with thermal shutdown and load-dump immunity; operates continuously across −40 °C to +125 °C junction range. Use Value: 40 V absolute max rating and 45 V transient capability ensure survival during 12 V system load dump; exposed pad sustains 1.5 A at +105 °C ambient. |
| Body Control Unit (BCU) | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Generates 5 V for microcontroller, CAN transceiver, and door lock actuators in centralized BCU modules. IC Role / Device Role / Timing Role: Main 5 V regulator with SHDNB-controlled power sequencing; BOOST pin ensures low dropout during cold-crank (4.0 V start). Use Value: 4.0 V startup voltage and 1.0 µA shutdown current enable reliable cold-crank operation and zero-power sleep mode for wake-on-CAN functionality. | Use Scenario: Provides isolated 3.3 V bias for torque and position sensors in EPS motor control units subject to high EMI and vibration. IC Role / Device Role / Timing Role: Low-noise, EMI-robust power stage; SYNC pin locks switching to main MCU clock to eliminate interference in analog sensor signals. Use Value: Fixed 340 kHz frequency simplifies EMI filter design; 0.29 V foldback threshold ensures safe current limiting during sensor short circuits without latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5–65 V input, 1.5 A, 100–2.2 MHz adjustable frequency; uses current-mode control instead of V²; no integrated BOOST driver. | Better suited for higher-input industrial systems; lacks bootstrapped drive for low-VIN operation; requires external high-side FET. | Select when wider input range or programmable frequency is required; not drop-in due to different control architecture and pinout. |
| TPS54340QDDARQ1 | 3.5–42 V input, 3.5 A, 100–2.5 MHz; current-mode control; integrated high-side MOSFET (not bipolar); no BOOST pin. | Higher current capability but larger solution size; no frequency foldback-relies on hiccup mode for short-circuit protection. | Choose for higher output current needs; requires redesign of compensation and thermal layout; not pin-compatible. |
Compared with LM5164QDDARQ1 and TPS54340QDDARQ1, the NCV8843MNR2G offers superior transient response and simpler compensation via V² control, lower quiescent current in shutdown (1.0 µA vs ≥10 µA), and integrated BOOST drive for efficient low-input operation-but trades off adjustable frequency and higher input voltage range.
Availability
NCV8843MNR2G is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera power supplies, and infotainment subsystems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for NCV8843MNR2G 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, imaging, and intelligent sensing.
The NCV8843MNR2G belongs to onsemi's automotive-qualified DC-DC regulator portfolio, designed specifically for robust, high-efficiency 12 V/24 V system power conversion in harsh environments with strict AEC-Q100 compliance requirements.
FAQ
What is the minimum input voltage required for NCV8843MNR2G to start switching?
The NCV8843MNR2G has a guaranteed startup voltage of 3.0 V, with typical operation beginning at 3.5 V and maximum specification of 4.0 V. Below 3.0 V, the internal LDO cannot power control circuitry, so no switching occurs. This ensures reliable cold-crank performance in automotive 12 V systems where battery voltage may dip to 3.2 V during engine start.
Does NCV8843MNR2G require an external bootstrap diode and capacitor?
Yes-the NCV8843MNR2G requires an external 0.1 µF ceramic capacitor and a fast-switching diode (e.g., 1N4148 or BAS116) connected between VIN and BOOST to generate the bootstrapped voltage needed for NPN saturation. The diode anode connects to VIN or regulated output; cathode to BOOST. This configuration ensures VBOOST ≥ VIN + 2.5 V during switch-on, minimizing saturation voltage and conduction loss.
How does the frequency foldback feature work in NCV8843MNR2G during short circuit?
When VFB drops below 0.29 V, the NCV8843MNR2G reduces switching frequency to ≤85 kHz (≤25% of nominal 340 kHz) and lowers current limit to 0.9–2.1 A. This dual-foldback action cuts average power dissipation by >70%, preventing thermal runaway. The reduced frequency extends switching period, allowing inductor current to decay fully and limiting RMS current in external components like catch diodes and inductors.
Can NCV8843MNR2G be synchronized to an external clock, and what is the valid frequency range?
Yes-the NCV8843MNR2G accepts external synchronization via its SYNC pin across 377–710 kHz. The input is TTL-compatible with 0.9–1.9 V threshold and 60 kΩ internal pull-down. During sync mode, frequency foldback is disabled, and the rising edge of the external clock forces immediate switch turn-on with ~0.5 µs delay. This enables EMI reduction in multi-rail systems by eliminating beat frequencies.
What thermal derating applies to NCV8843MNR2G in the DFN18 package at +105 °C ambient?
In the DFN18 package on a 4-layer PCB with 600 mm² copper area, the NCV8843MNR2G has RJA = 38 °C/W. At +105 °C ambient, maximum allowable power dissipation before reaching 150 °C junction limit is (150 − 105)/38 ≈ 1.18 W. Accounting for typical losses (e.g., 0.8 W at 1.5 A/12 V→3.3 V), full 1.5 A output remains viable up to +105 °C ambient with proper PCB thermal design.
NCV8843MNR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 18-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 18-DFN (5x6)
NCV8843MNR2G FAQ
1.How can I place an order for NCV8843MNR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8843MNR2G 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 NCV8843MNR2G reliable?
The price and inventory of NCV8843MNR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8843MNR2G is usually 5 days.
3.What payment methods are accepted for NCV8843MNR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8843MNR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8843MNR2G?
NCV8843MNR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8843MNR2G 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 NCV8843MNR2G?
For technical support, including NCV8843MNR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8843MNR2G requirements.
6.How does Aetrix verify that NCV8843MNR2G is sourced from the original manufacturer or authorized distributors?
All NCV8843MNR2G 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 NCV8843MNR2G meets industry standards.
7.What is the process for return or replacement of NCV8843MNR2G?
All NCV8843MNR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV8843MNR2G, 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 NCV8843MNR2G part is unused and in its original packaging.
Return procedure for NCV8843MNR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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