onsemi NCV8509PDW18

Overview

NCV8509PDW18 from onsemi is an automotive-grade dual linear voltage regulator with sequenced power-up for microcontroller core (1.8 V) and I/O (3.3 V) rails, delivering 115 mA and 100 mA respectively at ±2% output accuracy, featuring programmable slew rate, dual-drive RESET, and integrated power shunt for thermal optimization in engine control units and telematics modules.

For engineers reviewing the NCV8509PDW18 datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3 V/1.8 V dual-output sequencing, 175 µA quiescent current at light load, SOW-16 exposed-pad thermal performance, AEC-Q100 qualification, and RESET validity down to 0 V on either VIN1 or VOUT1.

Technical Context

The NCV8509PDW18 implements independent error amplifiers and bandgap references for each output, enabling precise tracking and independent regulation of VOUT1 (3.3 V) and VOUT2 (1.8 V). Its power shunt architecture routes part of VOUT2 current through external REX to reduce on-die dissipation, especially critical under high VIN1 conditions.

SLEW pin controls rise time via a 6.0 µA internal current source charging CSLEW; Delay pin provides programmable reset delay using the same principle. RESET is driven by both VIN1 and VOUT1, ensuring valid assertion even during deep brown-out events on either rail.

Key Specifications

Pinout & Package

SOW-16 wide-body SOIC package with exposed thermal pad (Case 751AG), 10.3 mm × 7.5 mm footprint, 1.6 mm height, Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-sequenced LDO regulator applications.

Compared with NCV8509PDW25R2G, the NCV8509PDW18 delivers optimized 3.3 V/1.8 V sequencing for modern ARM Cortex-M MCUs, while TPS74901RGWR lacks core-rail support and thermal shunting-making it unsuitable as a drop-in replacement.

Availability

NCV8509PDW18 is available at Aetrix Electronics and suitable for automotive powertrain control, telematics modules, and ADAS camera systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for NCV8509PDW18 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 power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The NCV8509PDW18 belongs to the NCV8509 Series of sequenced dual LDOs designed specifically for automotive microcontroller power domains, emphasizing robustness, thermal efficiency, and fail-safe reset behavior in harsh environments.

FAQ

What is the output voltage configuration of the NCV8509PDW18?

The NCV8509PDW18 is factory-configured for 3.3 V ±2% on VOUT1 (115 mA max) and 1.8 V ±2% on VOUT2 (100 mA max). These values are fixed and non-adjustable; the "18" suffix in the part number explicitly denotes the 3.3 V/1.8 V variant per onsemi's marking diagram and ordering information.

Does the NCV8509PDW18 support power sequencing between its two outputs?

Yes, the NCV8509PDW18 implements inherent power-up sequencing where VOUT1 (3.3 V I/O rail) powers up before VOUT2 (1.8 V core rail). This prevents I/O latch-up in modern microcontrollers and is achieved through internal biasing and error amplifier timing-no external components are required to enable this behavior in the NCV8509PDW18.

How does the power shunt function work on the NCV8509PDW18?

The NCV8509PDW18 uses VIN2 and an external REX resistor to route part of the VOUT2 current off-chip. When VIN1 exceeds ~4.5 V, the internal shunt activates, reducing on-die power dissipation. For a 100 mA VOUT2 load at 12 V VIN1, this can lower junction temperature by over 25°C compared to a conventional dual-LDO without shunt capability.

What is the minimum operating input voltage for the NCV8509PDW18?

The NCV8509PDW18 requires a minimum input voltage of 6.0 V on VIN1 to maintain regulation across its full temperature range (−40°C to +125°C). Below 6.0 V, VOUT1 and VOUT2 may drop out of specification; VIN1 absolute maximum is 50 V DC, with peak transient rating also at 50 V per the datasheet's Maximum Ratings table.

Is the NCV8509PDW18 pin-compatible with other variants in the NCV8509 series?

Yes, all NCV8509 variants-including NCV8509PDW18, NCV8509PDW25R2G, and NCV8509PDW26R2G-share identical SOW-16 exposed-pad packaging and pinout. The only differences are factory-set output voltages; no PCB redesign is needed when migrating between variants, provided the new voltage pair meets system requirements.