onsemi NCP2860DM277R2G

Overview

NCP2860DM277R2G from onsemi is a fixed-output 2.77 V, 300 mA low-noise, low-dropout linear regulator in Micro8 package. It delivers ultra-low output voltage noise (60 µV_RMS, 10 Hz–100 kHz), 150 mV dropout at full load, and features FAULT indicator, thermal shutdown, and 10 nA shutdown current - optimized for audio amplifier power rails in portable devices.

For engineers reviewing the NCP2860DM277R2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.77 V fixed output, Micro8 footprint compatibility, fault-indicator open-drain signaling, and PSRR of 60 dB at 1 kHz for noise-sensitive analog supply domains.

Technical Context

The NCP2860DM277R2G integrates a P-channel MOSFET pass transistor with no gate drive current, enabling ultra-low quiescent current (355 µA typical at no load) and high efficiency across input voltages from 3.0 V to 6.0 V. Its transconductance error amplifier provides stable regulation without external compensation.

Fault detection monitors input–output differential voltage relative to load current, asserting the open-drain FAULT pin low when dropout margin is insufficient. Thermal protection triggers shutdown at 170 °C with 30 °C hysteresis, and soft-start limits inrush current during power-up.

Key Specifications

Pinout & Package

Package: Micro8 (Case 846A), Pb-free, surface-mount, 3.0 mm × 3.0 mm footprint with 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO applications.

Compared with NCP2860DM277R2G, the XC6210B277MR-G offers lower noise but sacrifices fault visibility and current capability, while the BD73220GUL saves area and improves noise but removes critical diagnostic signaling and shifts output voltage - making NCP2860DM277R2G the only choice when 2.77 V, FAULT reporting, and 300 mA margin are jointly required.

Availability

NCP2860DM277R2G is available at Aetrix Electronics and suitable for portable audio systems, cellular handset power management, and handheld instrumentation requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP2860DM277R2G 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, and sensor solutions for automotive, industrial, and consumer markets.

The NCP2860DM277R2G belongs to onsemi's low-noise LDO family designed specifically for noise-sensitive analog circuits in battery-powered portable electronics - emphasizing PSRR, output stability, and integrated protection.

FAQ

What is the output voltage tolerance of the NCP2860DM277R2G over temperature and load?

The NCP2860DM277R2G delivers 2.77 V with a guaranteed tolerance of ±40 mV across −25°C to +85°C ambient temperature and 0–300 mA load range. At 25°C and 100 mA load, typical output is 2.77 V; minimum is 2.73 V and maximum is 2.81 V per datasheet Table 1. This tight tolerance ensures consistent biasing for precision analog stages without external trimming. The NCP2860DM277R2G maintains regulation even as battery voltage drops to 3.0 V due to its 150 mV dropout.

How does the FAULT pin function in the NCP2860DM277R2G?

The FAULT pin on the NCP2860DM277R2G is an open-drain N-channel MOSFET output that pulls low when the input–output differential falls below the dynamic dropout threshold (120–280 mV depending on load). During normal operation or shutdown, it remains high-impedance. To use it, connect a pull-up resistor (e.g., 100 kΩ to OUT) so the pin goes high when healthy and low during fault. This allows microcontrollers to detect impending regulation loss before audio distortion or ADC errors occur. The NCP2860DM277R2G does not assert FAULT during thermal shutdown - only during dropout.

Can the NCP2860DM277R2G be used with ceramic output capacitors?

Yes, the NCP2860DM277R2G is fully compatible with ceramic output capacitors. The datasheet specifies a minimum 2.2 µF low-ESR ceramic capacitor on the OUT pin for stability across temperature and load. ESR should be ≤0.5 Ω; standard X5R or X7R types meet this requirement. Using higher-value ceramics (e.g., 10 µF) further improves transient response and reduces output noise - confirmed by Figure 11 load transient plots in the NCP2860DM277R2G datasheet. No series resistance or special dielectric is needed.

What is the thermal shutdown behavior of the NCP2860DM277R2G?

The NCP2860DM277R2G enters thermal shutdown when junction temperature exceeds 170 °C, with 30 °C hysteresis - meaning it resumes operation only after cooling to ~140 °C. Shutdown disables the pass transistor and reduces quiescent current to 10 nA. Unlike many LDOs, this thermal protection is independent of the STDWN pin state: it activates even during active regulation. Recovery is automatic and does not require cycling EN. The NCP2860DM277R2G's Micro8 package has a θ_JA of 230 °C/W on standard FR-4, so proper copper pour and airflow are essential for sustained 300 mA operation.

Does the NCP2860DM277R2G require an input capacitor?

Yes, the NCP2860DM277R2G requires a 2.2 µF ceramic input capacitor placed close to the IN and GND pins. This capacitor stabilizes the input supply against source impedance, suppresses high-frequency noise from upstream DC/DC converters, and prevents oscillation during fast load transients. The datasheet explicitly states "Bypass with a 2.2 µF capacitor" for the IN pin. Omitting it risks instability, especially when powered from switchers or long PCB traces. The NCP2860DM277R2G's internal architecture assumes this capacitance for proper loop compensation and PSRR performance.