onsemi NCV8518CPWR2G

Overview

NCV8518CPWR2G from onsemi is an automotive-grade linear voltage regulator with integrated watchdog, wake-up, RESET, and ENABLE functions. It delivers a precise 5.0 V ±2% output at up to 250 mA, features 356 mV typical dropout at 150 mA, 70 µA quiescent current, and supports 45 V load-dump transients - designed for microprocessor power management in engine control units and instrument clusters.

For engineers reviewing the NCV8518CPWR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, micropower sleep mode (<1.0 µA), adjustable reset/wake-up timing via R_Delay, and SOIC-16 WB EP package with exposed pad for thermal performance in harsh automotive environments.

Technical Context

The NCV8518CPWR2G integrates a low-dropout pass transistor with precision bandgap reference, UVLO, thermal shutdown, and current limiting - all operating across −40°C to +150°C junction temperature. Its watchdog logic monitors falling edges on WDI with ≥1 µs minimum pulse width and enforces a 5 µs blanking window after Wake Up rising edge to reject glitches.

RESET assertion occurs under four conditions: power-on delay (configurable via R_Delay), V_OUT drop below 4.65 V, missing WDI edge within one Wake Up period, or VIN falling below internal UVLO threshold (~4.65 V at 25°C). Wake Up output is a 5 V square wave with 45–55% duty cycle, frequency set solely by R_Delay (e.g., 24 ms period at 120 kΩ).

Key Specifications

Pinout & Package

NCV8518CPWR2G uses the SOIC-16 WB EP (Case 751AG) package with exposed thermal pad. Pin 1 is top-left corner; pins 1–8 are left side, 9–16 right side. Exposed pad must be soldered to PCB ground plane for optimal thermal performance (θ_JA = 73.8°C/W on 1 sq. inch copper).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive voltage regulator with supervision applications.

Compared with NCV8518CPWR2G, NCV8518CPDR2G offers identical functionality in a smaller footprint but reduced thermal performance, while TLV70750PDRVR lacks integrated supervision entirely - making NCV8518CPWR2G the sole choice for AEC-Q100-compliant, function-integrated power management in safety-critical ECUs and clusters.

Availability

NCV8518CPWR2G is available at Aetrix Electronics and suitable for engine control units, instrument clusters, and body control modules requiring stable component supply, automotive qualification, and long-term lifecycle support.

Supply support for NCV8518CPWR2G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.

The NCV8518C product line was developed specifically for automotive microprocessor power management - integrating precision regulation, fault detection, and low-power supervision into a single AEC-Q100-qualified device.

FAQ

What is the maximum input voltage the NCV8518CPWR2G can withstand during load dump events?

The NCV8518CPWR2G is designed to withstand 45 V peak transients per ISO 16750-2 Load Dump Class B testing. This rating is guaranteed by design (not production-tested) and applies to both VIN and ENABLE pins. The device remains functional and undamaged during these events without requiring external TVS diodes, making it suitable for direct connection to automotive battery rails.

How does the Wake Up output behave when the NCV8518CPWR2G enters RESET state?

During any RESET condition - whether triggered by power-up, VOUT sag, missing WDI edge, or UVLO - the Wake Up output is forced low and held inactive until RESET returns high. After RESET deasserts, the Wake Up signal resumes its configured periodic waveform. This behavior ensures the MCU receives a clean wake-up signal only after full system recovery, preventing spurious interrupts during fault recovery.

Can the NCV8518CPWR2G operate with an input voltage below 6.0 V?

No - the NCV8518CPWR2G has a specified minimum input voltage of 6.0 V per Recommended Operating Ranges. Below this, internal biasing fails and regulation cannot be guaranteed. While the dropout voltage is 356 mV, the absolute minimum VIN is constrained by internal circuitry requirements, not just pass transistor headroom. Operation below 6.0 V may result in undefined behavior or failure to enable.

What is the purpose of the Delay pin on the NCV8518CPWR2G, and how is it used?

The Delay pin outputs a buffered 0.48 V reference that sources a constant current to an external resistor (R_Delay). This current charges an internal capacitor to generate three timing intervals: Power-On Reset delay, Wake Up period, and RESET-to-Wake Up delay. R_Delay values from 60 kΩ to 500 kΩ configure these intervals linearly - e.g., 120 kΩ yields ~24 ms Wake Up period and ~12 ms RESET delay - enabling precise system-level timing without additional ICs.

Is the NCV8518CPWR2G pin-compatible with other devices in the NCV8518C family?

Yes - the NCV8518CPWR2G (SOIC-16 WB EP) shares identical pin functions and electrical behavior with other NCV8518C variants, including NCV8518CPDR2G (SOIC-8 EP). However, pin count and physical layout differ: SOIC-16 exposes dedicated pins for NC, Delay, and Wake Up, while SOIC-8 consolidates some functions. Board redesign is required when switching between packages, though firmware and external timing components remain interchangeable.