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onsemi NCV8843PWR2G
- Part No.:
- NCV8843PWR2G
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
NCV8843PWR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,563
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Product details
Overview
NCV8843PWR2G from onsemi is a synchronous buck regulator IC delivering 1.5 A output current at 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 for short-circuit protection - used in automotive body control modules requiring robust 12 V–24 V DC-DC conversion.
For engineers reviewing the NCV8843PWR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its 340 kHz fixed-frequency operation, V² control's load-transient immunity, BOOST pin voltage headroom requirement (≥2.5 V above VSW), SYNC input compatibility with external clocks up to 710 kHz, and SO-16W EPAD package thermal performance (RJA = 35 °C/W).
Technical Context
The NCV8843PWR2G implements proprietary V² control, using output voltage ripple as the primary ramp signal for PWM comparison - eliminating need for external slope compensation while enabling sub-100 ns transient recovery. Its transconductance error amplifier provides 70 dB open-loop gain and 500 kHz unity-gain bandwidth, with VC pin offering direct access to compensation node for single-capacitor (0.1 µF) stability.
Internal protection includes frequency foldback (reducing fSW to ≤85 kHz when VFB < 0.29 V) and current limit foldback (reducing ILIM from 2.3 A typ. to 1.5 A typ.), both triggered simultaneously during overloads. The BOOST pin supplies base drive current proportional to switching current (up to 30 mA at 1.5 A), requiring external 0.1 µF capacitor and diode for bootstrapping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 340 kHz ±10% - enables compact magnetics (e.g., 18 µH inductor) and reduces EMI filtering burden. |
| Input Voltage Range | 4.0 V to 40 V - supports automotive cold-crank (≥3.5 V startup) and 31 V load-dump survival (peak 45 V). |
| Output Current | 1.5 A continuous - delivered via integrated NPN switch with 0.7 V typ. saturation voltage at 1.5 A. |
| VFB Reference | 1.270 V ±2.0% - sets output voltage via resistor divider; tolerance directly impacts regulation accuracy. |
| Current Limit Threshold | 2.3 A typ. - triggers cycle-by-cycle shutdown; folds back to 1.5 A typ. under short-circuit conditions. |
| Thermal Shutdown | 185 °C trip point with 42 °C hysteresis - prevents latch-up during sustained overload or poor heatsinking. |
| SYNC Input Range | 377–710 kHz - allows synchronization to external clock for noise-sensitive applications or multi-rail coherence. |
Pinout & Package
NCV8843PWR2G is packaged in SO-16W EPAD (Case 751AG), featuring an exposed thermal pad internally connected to GND. The 16-pin wide-body SOIC layout enables enhanced thermal dissipation (RJC = 16 °C/W) and PCB-level heat spreading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap supply for NPN base drive | Must be ≥2.5 V above VSW during switch-on; requires external 0.1 µF capacitor + diode to maintain drive headroom and minimize conduction loss. |
| 2 (VIN) | Main power input | Supplies internal LDO (2.9 V rail), oscillator, and logic; withstands 45 V peak transient (load dump). |
| 3 (VSW) | Switch emitter node | Connects to inductor; swings to −1.0 V (50 ns max) during flyback - mandates catch diode and short, low-inductance routing. |
| 4 (SHDNB) | Active-low shutdown control | Pulled below 1.3 V to enter sleep mode (<1.0 µA quiescent); internal 20 kΩ pull-down requires external 100 kΩ pull-up for safe 9–40 V operation. |
| 5 (SYNC) | External clock synchronization input | TTL-compatible rising-edge trigger; disables frequency foldback when active; 60 kΩ internal pull-down if unused. |
| 6 (GND) | Power return reference | Primary ground return for power switch, error amp, and internal regulators; must be low-impedance connection to EPAD. |
| 7 (VFB) | Inverting input of error amplifier | Monitors output via resistor divider; voltage <0.29 V initiates foldback protection; 0.02 µA bias current minimizes divider error. |
| 8 (VC) | Error amplifier output / PWM comparator input | Provides compensation node; clamped to 1.46 V max to enable fast recovery from overcurrent; 0.1 µF to GND sets dominant pole. |
| 9–14 (NC) | No connection | Unbonded pins - no electrical function; must remain unconnected per datasheet. |
| 15 (EPAD) | Exposed thermal pad | Internally tied to GND; external solder connection required for thermal performance (RJA = 35 °C/W on 4-layer board). |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Uses output ripple as natural ramp signal - eliminates external slope compensation, enables <100 ns load-step response without sacrificing stability. |
| Frequency foldback under fault | Reduces switching frequency to ≤85 kHz when VFB < 0.29 V - cuts power dissipation by >75% during short circuit while maintaining regulation. |
| BOOST pin bootstrapping | Enables saturated NPN switch operation - lowers VCE(sat) to 0.7 V typ. at 1.5 A, improving efficiency by ~3% vs. non-bootstrapped design. |
| Automotive-grade qualification | NCV prefix indicates AEC-Q100 compliance, −40 °C to +150 °C junction operation, and site/change control - suitable for engine bay and chassis applications. |
| Soft-start via VC pin | 0.1 µF capacitor on VC provides >5 ms controlled output ramp - prevents inrush stress on output capacitors and catch diode without extra components. |
Applications
| Automotive Body Control Unit (BCU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuits from 12 V battery rail in door module or lighting controller. IC Role / Device Role / Timing Role: Primary 3.3 V/1.5 A DC-DC converter with V² control ensuring stable supply during cranking (6.5 V min) and load dump (40 V max). Use Value: 340 kHz switching allows small 18 µH inductor and ceramic output caps; SYNC pin enables noise coordination with MCU clock domain. |
Use Scenario: Generating isolated 5 V rail for digital I/O drivers in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: High-input-voltage buck regulator converting 24 V industrial bus to regulated 5 V at 1.2 A, with thermal shutdown protecting against enclosure overheating. Use Value: 40 V max input rating eliminates need for pre-regulator; exposed EPAD sustains 150 °C junction temp in sealed enclosures. |
| Automotive ADAS Camera Power Supply | Commercial HVAC Controller |
|
Use Scenario: Providing clean 1.8 V supply to image sensor and ISP in rear-view camera module mounted near exhaust. IC Role / Device Role / Timing Role: Secondary buck stage (fed from 5 V intermediate rail) with soft-start preventing sensor reset during ignition cycles. Use Value: V² control rejects high-frequency noise from nearby motor drivers; BOOST pin ensures consistent regulation across temperature (-40 °C to +105 °C ambient). |
Use Scenario: Converting 24 V HVAC system power to 3.3 V for thermostat microcontroller and wireless BLE radio. IC Role / Device Role / Timing Role: Main system regulator with SHDNB enabling deep-sleep mode during occupancy sensing gaps. Use Value: 1.0 µA shutdown current extends battery backup life; SYNC input aligns switching noise away from 2.4 GHz RF band. |
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 | 5 A rated, 260 kHz fixed frequency, no V² control - requires external compensation and slope compensation for >50% duty cycle. | Higher current capability but larger solution size; lacks frequency foldback and automotive qualification. | Choose for cost-sensitive industrial designs needing >2 A output where thermal margin exceeds 40 °C. |
| MPQ4312-AEC1 | 2 A rated, 2.2 MHz switching, integrated MOSFETs, no BOOST pin - uses external bootstrap capacitor instead of dedicated BOOST terminal. | Higher frequency enables smaller inductors but increases EMI; AEC-Q100 qualified but lacks SYNC input and V² architecture. | Prefer for space-constrained automotive infotainment systems where 2.2 MHz operation avoids AM band interference. |
Compared with LM2678SD-3.3/NOPB and MPQ4312-AEC1, the NCV8843PWR2G offers superior transient response via V² control, built-in fault-foldback behavior, and SO-16W EPAD thermal performance - making it optimal for automotive body electronics where reliability under voltage transients and thermal stress is critical.
Availability
NCV8843PWR2G is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC I/O modules, ADAS camera power supplies, and commercial HVAC controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for NCV8843PWR2G 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, with leadership in automotive, industrial, cloud, and IoT power management solutions.
The NCV8843PWR2G belongs to onsemi's automotive-grade DC-DC converter product line, designed specifically for robust 12 V/24 V system power conversion in harsh environments - emphasizing transient immunity, thermal resilience, and functional safety readiness.
FAQ
What is the minimum input voltage required for NCV8843PWR2G to start switching?
The NCV8843PWR2G requires VIN ≥ 3.5 V (typical) to initiate startup, with guaranteed operation above 4.0 V. Below 3.5 V, the internal 2.9 V LDO cannot power control circuitry, preventing oscillator activation. This ensures reliable operation during automotive cold-crank events where battery voltage dips to 6.0 V - the NCV8843PWR2G remains functional as long as VIN stays above its 3.5 V startup threshold.
Does NCV8843PWR2G require an external bootstrap diode and capacitor?
Yes, the NCV8843PWR2G requires an external diode (e.g., 1N4148) and 0.1 µF capacitor connected between BOOST and VSW to generate sufficient base drive voltage for the internal NPN transistor. Without this network, BOOST voltage collapses during switch-on, increasing VCE(sat) and reducing efficiency by up to 5%. The diode anode may connect to VIN or VOUT depending on topology - datasheet Figure 1 shows VOUT connection for standard buck configuration.
How does the SYNC pin affect frequency foldback behavior in NCV8843PWR2G?
When the SYNC pin is actively driven (e.g., with external 443 kHz clock), frequency foldback is disabled - the NCV8843PWR2G maintains full 340 kHz operation even if VFB falls below 0.29 V. This preserves switching consistency in noise-sensitive systems but removes short-circuit power dissipation reduction. Designers must weigh EMI control against fault-protection trade-offs when enabling SYNC mode in automotive applications.
What is the maximum allowable voltage on the BOOST pin of NCV8843PWR2G?
The BOOST pin of NCV8843PWR2G has an absolute maximum rating of 40 V, matching VIN's upper limit. Exceeding this risks oxide breakdown in the internal pre-driver circuitry. In practice, BOOST voltage equals VIN + VOUT − VF (diode forward drop), so for 24 V input and 3.3 V output, BOOST reaches ~26.5 V - well within safe margin. Always verify BOOST voltage under worst-case load dump (45 V peak) to ensure clamp diode protection.
Can NCV8843PWR2G operate without connecting the EPAD thermal pad?
No - the EPAD on NCV8843PWR2G is internally connected to GND and must be soldered to a thermally optimized PCB copper area. Omitting EPAD connection increases RJA from 35 °C/W to >100 °C/W, causing junction temperature to exceed 150 °C at just 0.8 A load. Datasheet Note 3 specifies 600 mm² of 1 oz copper on outer layers as minimum for rated 1.5 A operation - thermal derating is severe without proper EPAD attachment.
NCV8843PWR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width) Exposed Pad
- 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:
- 16-SOIC
NCV8843PWR2G FAQ
1.How can I place an order for NCV8843PWR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8843PWR2G 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 NCV8843PWR2G reliable?
The price and inventory of NCV8843PWR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8843PWR2G is usually 5 days.
3.What payment methods are accepted for NCV8843PWR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8843PWR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8843PWR2G?
NCV8843PWR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8843PWR2G 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 NCV8843PWR2G?
For technical support, including NCV8843PWR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8843PWR2G requirements.
6.How does Aetrix verify that NCV8843PWR2G is sourced from the original manufacturer or authorized distributors?
All NCV8843PWR2G 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 NCV8843PWR2G meets industry standards.
7.What is the process for return or replacement of NCV8843PWR2G?
All NCV8843PWR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV8843PWR2G, 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 NCV8843PWR2G part is unused and in its original packaging.
Return procedure for NCV8843PWR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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