onsemi NCV97311MW50R2G

Overview

NCV97311MW50R2G from onsemi is a high-accuracy, low-noise, 5.0 V fixed-output automotive LDO regulator with 300 mA output current, ±1.5% output voltage tolerance over temperature and load, and 45 µV_RMS output noise (10 Hz–100 kHz). It operates from 3.5 V to 40 V input and features reverse battery protection, thermal shutdown, and current limiting - deployed in engine control units and ADAS camera modules.

For engineers reviewing the NCV97311MW50R2G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, ultra-low noise performance, wide input range, integrated protection functions, and automotive-grade reliability under transient load and cold-crank conditions.

Technical Context

The NCV97311MW50R2G uses a PMOS pass transistor architecture enabling near-zero dropout (typically 280 mV at 300 mA), allowing stable regulation during cold-crank events down to 3.5 V input. Its bandgap reference and error amplifier are trimmed for ±1.5% initial accuracy and <±0.1%/°C line/load regulation drift.

Internal circuitry includes undervoltage lockout (UVLO) at 2.7 V, active reverse-battery protection (−40 V tolerant), and foldback current limiting that reduces power dissipation during short-circuit events without requiring external components.

Key Specifications

Pinout & Package

NCV97311MW50R2G is housed in a thermally enhanced 5-pin DFN package (3.0 mm × 3.0 mm, 0.5 mm pitch, exposed thermal pad), optimized for high-power-density automotive PCB layouts with minimal footprint and low thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive LDO regulator applications.

Compared with TLV73350PDBVR and TPS7B8250QDCYRQ1, the NCV97311MW50R2G uniquely combines reverse-battery protection, Grade 1 qualification, and 45 µV_RMS noise in a single 3.0×3.0 mm DFN - making it optimal for space-constrained, safety-critical ADAS and powertrain nodes where protection and signal integrity are non-negotiable.

Availability

NCV97311MW50R2G is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and body control modules requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for NCV97311MW50R2G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCV97311MW50R2G belongs to onsemi's Automotive Power Management portfolio, engineered specifically for ASIL-B compatible ECUs needing robust, low-noise, protected LDO regulation in harsh vehicle environments.

FAQ

What is the maximum input voltage rating for the NCV97311MW50R2G?

The NCV97311MW50R2G supports an absolute maximum input voltage of 45 V, with guaranteed operation up to 40 V per datasheet specifications. This allows safe handling of automotive load-dump transients defined by ISO 7637-2 Pulse 5a (up to 40 V for 400 ms). Operation beyond 40 V is not recommended for continuous use, though the device survives brief transients per AEC-Q100 stress testing protocols. Always include appropriate TVS clamping if system-level transients exceed 40 V.

Does the NCV97311MW50R2G require an external capacitor on the output pin?

Yes, the NCV97311MW50R2G requires a minimum 1.0 µF X7R ceramic capacitor placed as close as possible to the OUT pin for stability and transient response. The datasheet specifies 1.0–22 µF range; using <1.0 µF risks oscillation under load steps, while >22 µF may increase start-up time and overshoot. A 2.2 µF/16 V X7R capacitor with low ESR (<50 mΩ) is commonly used in production designs for optimal phase margin and noise filtering.

How does the power good (PG) output of the NCV97311MW50R2G behave during startup and fault conditions?

The PG pin of the NCV97311MW50R2G is an open-drain output that pulls low during startup until the OUT voltage reaches 4.75 V (95% of 5.0 V) and remains within regulation. It stays low during undervoltage, overtemperature, or short-circuit faults. A pull-up resistor (typically 10 kΩ to 3.3 V or 5 V) is required externally. PG assertion confirms both regulation stability and absence of internal faults - making it essential for safe microcontroller boot sequencing in automotive systems using the NCV97311MW50R2G.

Is the NCV97311MW50R2G pin-compatible with other onsemi 5 V automotive LDOs like the NCV87311?

No, the NCV97311MW50R2G is not pin-compatible with the NCV87311. While both are 5 V automotive LDOs in DFN packages, the NCV87311 uses a 6-pin WDFN package with separate V_REF and FB pins for adjustable output, whereas the NCV97311MW50R2G uses a 5-pin DFN with fixed 5.0 V output and integrated PG/EN functionality. PCB redesign is required to substitute one for the other; refer to respective package drawings (EIAJ SC-88A for NCV87311 vs. onsemi DFN5 3×3 for NCV97311MW50R2G).

What thermal performance can be expected from the NCV97311MW50R2G in a standard 4-layer automotive PCB?

On a standard 4-layer automotive PCB with 1 oz copper, 200 mm² thermal pad copper pour connected to internal ground planes, the NCV97311MW50R2G achieves θ_JA ≈ 65°C/W. At 300 mA output and 13.5 V input, power dissipation is ~2.55 W, resulting in ~166°C junction rise above ambient - exceeding safe limits. Derating to 200 mA (1.7 W dissipation) yields ~110°C rise, keeping junction <150°C at 40°C ambient. Use thermal vias (≥8×0.3 mm) under the exposed pad and minimize IN-to-OUT trace length to maintain reliability in the NCV97311MW50R2G design.