onsemi NCV8881PWR2G

Overview

NCV8881PWR2G from onsemi is an automotive-grade buck regulator with integrated watchdog, dual LDOs (5 V/100 mA and 8.5 V/40 mA), and SMPS output undervoltage monitoring. It delivers 1.5 A switching output from 5–19 V input, withstands 40 V load dump, and operates across −40 °C to +150 °C junction temperature - designed for infotainment power rails and CPU supervision in vehicle battery-connected systems.

For engineers reviewing the NCV8881PWR2G datasheet, pinout, applications, or equivalent options, key selection criteria include programmable SMPS frequency (154–850 kHz), resistor-programmable watchdog delay (48–1300 ms), VIN UVLO/ovv thresholds (5.6 V start / 20 V overvoltage stop), 2% reference tolerance, and SO-16W EP package thermal performance (R_JA = 55 °C/W).

Technical Context

The NCV8881PWR2G integrates a voltage-mode buck controller with internal 1.5 A N-channel power switch, two independent LDOs sharing a single LDOMON fault flag, and a resistor-programmable watchdog timer that also monitors SMPS regulation status. Its enable input features user-configurable hysteresis via external resistor divider, and the IGNBUF open-drain output replicates EN state for ignition signaling.

SMPS operation supports resistor-programmed or externally synchronized switching (160–600 kHz), with internal soft-start (3–7 ms), cycle-by-cycle current limit (1.75–3 A), short-circuit detection (70–85% V_REF), and bootstrap diode integration. All regulators include thermal shutdown (160–180 °C), input overvoltage protection, and LDO UVLO with 2% hysteresis.

Key Specifications

Pinout & Package

NCV8881PWR2G uses the SO-16W EP (Case 751AG) package with exposed thermal pad. The 16-pin wide-body SOIC includes integrated heat dissipation path via soldered exposed pad, supporting high-power automotive operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive power management applications.

Compared with TPS65381A-Q1 and MAX20090ATPA/VY+, the NCV8881PWR2G uniquely combines 1.5 A buck, dual LDOs, hardware watchdog, and shared LDOMON fault flag in a single SO-16W EP package - optimizing BOM count, diagnostic granularity, and thermal performance for cost-sensitive automotive subsystems.

Availability

NCV8881PWR2G is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, digital instrument clusters, and body control units requiring stable component supply under AEC-Q100 stress conditions and long-term automotive lifecycle support.

Supply support for NCV8881PWR2G 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 leader focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications with strong AEC-Q100 and IATF 16949 compliance.

The NCV8881PWR2G belongs to onsemi's automotive power management portfolio, engineered specifically for battery-connected systems requiring integrated regulation, supervision, and transient resilience in harsh vehicle environments.

FAQ

What is the maximum input voltage the NCV8881PWR2G can withstand during load dump events?

The NCV8881PWR2G is rated to withstand 40 V input transients, complying with ISO 7637-2 Pulse 5a for 12 V automotive systems. Its internal overvoltage protection activates at 19–21 V (typical 20 V stop threshold), pulling RESB low and shutting down all regulators until VIN drops below the restart threshold of 18–19.2 V. This ensures survival during alternator load dump without external TVS clamping in many designs.

How does the NCV8881PWR2G's watchdog function interact with the SMPS output regulation status?

The NCV8881PWR2G's RESB output goes low not only when the WDI pulse period exceeds the programmed watchdog delay, but also when the SMPS output falls outside regulation (FB < 89% or > 99% of 0.8 V reference). This dual-trigger behavior means RESB serves as both CPU reset and SMPS fault indicator - eliminating need for separate power-good monitoring circuitry in safety-critical applications.

Can the NCV8881PWR2G's SMPS output voltage be adjusted below 3.3 V?

Yes - the NCV8881PWR2G's SMPS output is programmable down to 0.8 V using the FB pin and external resistor divider, per the formula V_OUT = 0.8 V × (1 + R1/R2). While typical automotive applications use 3.3 V or 5 V outputs, this flexibility supports low-voltage SoCs or custom logic rails. The 2% reference tolerance ensures ±2.4% accuracy at 3.3 V output across temperature.

What thermal performance can be expected from the NCV8881PWR2G in a standard 1 oz. copper PCB layout?

In a standard 3" × 3" FR4 board with 1 in² (645 mm²) copper pour connected to the exposed pad, the NCV8881PWR2G achieves R_JA = 55 °C/W. At 1.5 A load and 13.2 V input, typical power dissipation is ~1.2 W, resulting in ~66 °C junction rise above ambient - well within the −40 °C to +150 °C operating range even at +85 °C ambient. No heatsink is required for most automotive applications.

Is the NCV8881PWR2G pin-compatible with other devices in the NCV88xx family?

No - the NCV8881PWR2G has a unique pinout optimized for its integrated watchdog, dual LDOs, and LDOMON functionality. Devices like NCV8853 or NCV8854 offer different feature sets (e.g., no watchdog, single LDO) and distinct pin assignments. PCB layout must be designed specifically for NCV8881PWR2G; migration requires schematic and layout revision.