onsemi NCP582DSQ28T1G

Overview

NCP582DSQ28T1G from onsemi is an ultra-fast, low-noise 150 mA CMOS LDO regulator with active-high enable and auto-discharge functionality, delivering a precise 2.8 V output at ±2% accuracy, 220 mV dropout at 150 mA, and 30 µV_RMS output noise (10 Hz–100 kHz). It operates from 2.0–6.0 V input and supports portable battery-powered systems requiring stable low-power rail generation.

For engineers reviewing the NCP582DSQ28T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its SC-82AB package footprint, 75 µA quiescent current, 70 dB PSRR at 1 kHz, 100 ppm/°C temperature coefficient, and compatibility with 0.47 µF ceramic output capacitance for 2.8 V operation.

Technical Context

The NCP582DSQ28T1G implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and pass transistor optimized for fast transient response and low noise. Its active-high CE pin integrates auto-discharge via an internal 60 Ω N-channel switch to rapidly discharge V_OUT when disabled.

Designed for high ripple rejection in noisy environments, it achieves 70 dB PSRR at 1 kHz and maintains <22 mV load regulation across 1–150 mA output current. The device features foldback current limiting and thermal shutdown protection, with guaranteed operation from −40°C to +85°C ambient.

Key Specifications

Pinout & Package

Package: SC-82AB (Case 419C), 4-pin surface-mount package with 1.8 × 1.2 mm footprint, 0.8 mm height, and Pb-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the NCP582DSQ28T1G uniquely combines ultra-low-noise operation (30 µV_RMS), active-high CE with auto-discharge, and sub-250 mV dropout-making it optimal for portable systems requiring both precision analog supply integrity and controlled power sequencing.

Availability

NCP582DSQ28T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable health monitors, industrial handheld scanners, and smart home sensor nodes requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP582DSQ28T1G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP582 series belongs to onsemi's precision low-dropout regulator product line, engineered specifically for battery-powered portable equipment demanding ultra-low noise, fast transient response, and high accuracy across temperature and load variations.

FAQ

What is the recommended input and output capacitor configuration for NCP582DSQ28T1G?

For NCP582DSQ28T1G, a 1.0 µF ceramic capacitor is required between Vin and GND. For Vout = 2.8 V (≥2.5 V), a 0.47 µF ceramic capacitor is recommended between Vout and GND. Low-ESR X5R or X7R dielectrics are preferred. Placement must be close to the pins with short, wide traces to ensure stability and noise suppression.

Does NCP582DSQ28T1G support auto-discharge, and how does it work?

Yes, NCP582DSQ28T1G supports auto-discharge via its active-high CE pin. When CE is driven low, an internal 60 Ω N-channel MOSFET connects Vout to GND, actively discharging the output capacitor. This prevents floating voltages and unintended wake-up in downstream circuitry, which is essential for battery-powered systems with strict power sequencing requirements.

What is the maximum output current and thermal limit of NCP582DSQ28T1G?

NCP582DSQ28T1G delivers up to 150 mA continuous output current. Its maximum junction temperature is 125°C, and it includes thermal shutdown protection. In the SC-82AB package, the maximum power dissipation is 150 mW at TA = 25°C. Derating is required above 25°C ambient; for example, at 85°C ambient, usable power drops to ~90 mW (≈32 mA at 2.8 V dropout).

How does the PSRR of NCP582DSQ28T1G vary with frequency?

NCP582DSQ28T1G provides 70 dB PSRR at 1 kHz and 60 dB at 10 kHz (measured with Iout = 30 mA, Vin – Vout = 1.0 V). PSRR degrades gradually above 10 kHz due to internal compensation; it remains >40 dB up to 100 kHz. This performance makes it effective against mid-frequency switching noise from buck converters and clock harmonics.

Is NCP582DSQ28T1G compatible with ceramic output capacitors only, or can tantalum be used?

NCP582DSQ28T1G is optimized and fully stable with ceramic output capacitors (0.47 µF for 2.8 V). Tantalum capacitors are not recommended due to their higher ESR and potential instability risks. The datasheet explicitly specifies ceramic types (X5R/X7R) and warns against electrolytic or high-ESR alternatives, as phase margin and transient response depend on low-impedance, low-ESR output capacitance.