onsemi NCV59301DS33R4G

Overview

NCV59301DS33R4G from onsemi is an automotive-grade, 3.3 V fixed-output, 3.0 A very low-dropout (VLDO) linear regulator in D2PAK-5 package with enable and error flag pins. It delivers ≤300 mV typical dropout at 3.0 A load, supports 2.24–13.5 V input range, features reverse output current protection, thermal shutdown, and stable operation with ≥47 µF ceramic output capacitors. It serves as post-regulator for FPGA/DSP core supplies in automotive infotainment systems.

For engineers reviewing the NCV59301DS33R4G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, 3.3 V ±2.5% output accuracy over –40°C to +125°C, fast transient response, logic-compatible EN/FLG interface, and thermal performance with R_JA = 52°C/W on standard PCB layout.

Technical Context

The NCV59301DS33R4G implements a PMOS pass transistor architecture enabling ultra-low dropout and fast line/load transient response. Its internal error amplifier drives the pass element with high gain and phase margin, ensuring stability with ceramic output capacitors without ESR requirements.

It integrates dual-function logic-level EN pin (enable/shutdown) and open-collector FLG pin (active-low fault indicator triggered at 93–95% of nominal V_OUT). Protection circuitry includes foldback current limiting (3.5–5 A), thermal shutdown at +125°C junction, and reverse current blocking up to 6.5 V (V_OUT–V_IN) during shutdown.

Key Specifications

Pinout & Package

D2PAK-5 (Case 936A) package with exposed thermal tab connected to GND - provides low R_JC = 2.1°C/W for efficient heat transfer to PCB copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV59300DS33R4G, the NCV59301DS33R4G adds essential EN/FLG functionality for system-level power management, while TPS7A4700RGWR trades automotive robustness for ultra-low noise - making NCV59301DS33R4G the optimal choice for safety-critical, thermally demanding automotive loads.

Availability

NCV59301DS33R4G is available at Aetrix Electronics and suitable for automotive infotainment systems, FPGA-based telematics gateways, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for NCV59301DS33R4G 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.

The NCV59301DS33R4G belongs to the NCV59300 series of automotive-qualified VLDO regulators designed specifically for high-current, low-noise point-of-load applications in safety-critical vehicle subsystems.

FAQ

What is the maximum input voltage rating for the NCV59301DS33R4G?

The NCV59301DS33R4G has an absolute maximum input voltage rating of 18 V, though its recommended operating range is 2.24 V to 13.5 V. This 18 V rating allows safe operation during automotive load-dump transients, while the 13.5 V upper limit ensures reliable regulation and thermal performance under continuous conditions. The device remains functional and protected within these boundaries per its AEC-Q100 qualification.

Does the NCV59301DS33R4G require an external output capacitor, and what type is recommended?

Yes, the NCV59301DS33R4G requires an external output capacitor for stability and transient performance. The datasheet specifies ≥47 µF ceramic (X7R or X5R) as the minimum value, with no ESR requirement. This enables compact, high-reliability designs versus electrolytic alternatives. Using less than 47 µF or non-ceramic types may cause instability or excessive output voltage deviation during load steps.

How does the error flag (FLG) pin on the NCV59301DS33R4G operate?

The FLG pin on the NCV59301DS33R4G is an open-collector output that pulls low when the regulated output falls below 93–95% of 3.3 V (≈3.08–3.12 V), indicating an undervoltage fault. It can sink up to 5 mA and must be externally pulled up to a logic-compatible voltage. During normal operation, FLG remains high-impedance; it asserts low only during faults such as overcurrent, thermal shutdown, or severe line sag - enabling real-time system monitoring.

Is the NCV59301DS33R4G pin-compatible with other devices in the NCP59300/NCV59300 family?

The NCV59301DS33R4G uses the D2PAK-5 package with EN and FLG pins, while the NCV59300DS33R4G uses D2PAK-3 without those pins - they are not pin-compatible. No other device in the family shares the identical 5-pin D2PAK-5 footprint and function set. Substitution requires PCB redesign unless replacing with another NCV59301 variant (e.g., NCV59301DS25R4G), which retains the same pinout and control interface.

What thermal performance can be expected from the NCV59301DS33R4G on a standard PCB?

On a PCB with 100 mm² of 2.0 oz copper heat spreading area, the NCV59301DS33R4G exhibits R_JA = 52°C/W. At 3.0 A load with 3.6 V input (0.3 V dropout), power dissipation is ~0.9 W; ambient temperature rise would be ~47°C above ambient. Junction temperature stays within the –40°C to +125°C range if ambient remains ≤78°C - confirming suitability for under-hood and enclosed industrial environments with adequate copper area.