onsemi NCP582LXV18T2G

Overview

NCP582LXV18T2G from onsemi is an ultra-fast, low-noise 150 mA CMOS LDO regulator with active-low enable and auto-discharge functionality, delivering a fixed 1.8 V output. It features 220 mV dropout at 150 mA, 30 µV_RMS output noise (10 Hz–100 kHz), and ±2% output voltage accuracy over −40°C to +85°C. Designed for portable battery-powered systems, it powers core logic rails in handheld instrumentation and camcorders.

For engineers reviewing the NCP582LXV18T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-563 package, active-low CE pin behavior, 75 µA quiescent current, and 70 dB PSRR at 1 kHz-critical for noise-sensitive analog and RF subsystems.

Technical Context

The NCP582LXV18T2G implements a CMOS-based pass transistor architecture with internal bandgap reference and error amplifier, enabling fast transient response and stable regulation under dynamic load steps. Its active-low enable input directly controls the output stage and activates an internal N-channel discharge switch when disabled.

It operates across 2.0–6.0 V input range while maintaining 1.8 V output with ≤22 mV load regulation (1–150 mA) and 0.02%/V line regulation. The device includes foldback current limiting and thermal shutdown, with junction temperature limited to 125°C.

Key Specifications

Pinout & Package

SOT-563 (Case 463A) - 6-pin, 1.6 mm × 1.2 mm surface-mount package with two ground pins (Pins 2 and 5), optimized for low-inductance layout and thermal performance in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the NCP582LXV18T2G uniquely combines active-low enable, auto-discharge, 220 mV dropout, and 70 dB PSRR in a 6-pin SOT-563-making it optimal for portable systems requiring controlled power sequencing and low-noise, fast-response regulation.

Availability

NCP582LXV18T2G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP582LXV18T2G 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 manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and portable markets.

The NCP582 series was designed specifically for battery-powered portable equipment demanding ultra-low noise, fast transient response, and precise voltage regulation with enable control-addressing core challenges in handheld instrumentation and imaging devices.

FAQ

What is the maximum input voltage rating for the NCP582LXV18T2G?

The NCP582LXV18T2G has an absolute maximum input voltage (Vin) rating of 6.5 V. Operation above this level risks permanent damage. The recommended operating input range is 2.0 V to 6.0 V, ensuring stable 1.8 V output regulation and compliance with all electrical specifications in the datasheet. Exceeding 6.5 V violates maximum ratings and may degrade reliability.

Does the NCP582LXV18T2G require an external noise-reduction capacitor?

No, the NCP582LXV18T2G achieves 30 µV_RMS output noise (10 Hz–100 kHz) without any external noise-reduction capacitor. Its internal design inherently minimizes noise generation, eliminating the need for additional capacitors or bypass networks typically required by older LDO architectures. This simplifies BOM and layout while maintaining low-noise performance.

How does the auto-discharge function operate on the NCP582LXV18T2G?

When the CE pin is driven high (disabled state), the NCP582LXV18T2G activates an internal 60 Ω N-channel transistor between Vout and GND, actively discharging the output capacitor. This prevents residual voltage from lingering on downstream circuits, ensuring clean power-down sequencing. Discharge time depends on output capacitance and load but is fully integrated-no external components are needed.

What is the thermal performance of the NCP582LXV18T2G in SOT-563 package?

In the SOT-563 package, the NCP582LXV18T2G has a maximum power dissipation of 500 mW at TA = 25°C. With a typical thermal resistance θ_JA of ~220°C/W (estimated from package size and dual-GND layout), it safely delivers 150 mA at 220 mV dropout (33 mW dissipation) without thermal derating up to +85°C ambient. Derating begins above 85°C per the 125°C max junction limit.

Can the NCP582LXV18T2G be used with ceramic output capacitors smaller than 0.47 µF?

The datasheet specifies 0.47 µF ceramic for Vout ≥ 2.5 V, but for the NCP582LXV18T2G (1.8 V output), 1.0 µF is recommended per the general guideline "Cout = 1.0 µF for Vout < 2.5 V". Using smaller values may compromise stability and transient response. Testing with 0.47 µF is possible but not validated; 1.0 µF ensures guaranteed performance across temperature and load conditions.