onsemi NCP4586SN285T1

Overview

NCP4586SN285T1 from onsemi is a CMOS 150 mA low-dropout linear regulator with ±1% output voltage accuracy at 2.85 V, 320 mV typical dropout at full load, and 80 dB PSRR at 1 kHz - designed for stable power delivery in space-constrained portable electronics such as MP3 players and camcorders.

For engineers reviewing the NCP4586SN285T1 datasheet, pinout, applications, or equivalent options, key selection considerations include its SOT-23-5 package, enable-low logic polarity, auto-discharge capability, low 30 µV_RMS output noise, and compatibility with 0.47 µF ceramic output capacitors.

Technical Context

The NCP4586SN285T1 implements a CMOS-based LDO architecture with internal current-foldback protection and a dedicated discharge transistor activated during shutdown. Its enable input is active-low (CE pin pulled high disables regulation), and it supports operation across 1.7–6.5 V input while maintaining 2.85 V output with ±1% accuracy over temperature.

Thermal performance is defined by R_JA = 238 °C/W in the SOT-23-5 package, enabling continuous 150 mA output up to +85°C ambient when properly mounted. The device achieves stable regulation with only 0.47 µF ceramic output capacitance and exhibits 30 µV_RMS integrated noise (10 Hz–100 kHz) at 2.85 V output.

Key Specifications

Pinout & Package

SOT-23-5 package (Case 1212), 2.7 mm × 3.1 mm footprint, with exposed thermal pad not connected internally - requires PCB copper pour for optimal thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/MB and XC6206P282MR-G, the NCP4586SN285T1 uniquely combines 2.85 V precision, active-low enable, and integrated auto-discharge - making it optimal for portable systems requiring controlled power sequencing and fast output collapse.

Availability

NCP4586SN285T1 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered audio devices, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for NCP4586SN285T1 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 focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.

The NCP4586SN285T1 belongs to onsemi's NCP4586 family of low-noise, low-dropout regulators - engineered specifically for space-constrained, battery-powered consumer and industrial equipment demanding high accuracy and fast transient response.

FAQ

What output voltage does the NCP4586SN285T1 deliver?

The NCP4586SN285T1 delivers a fixed 2.85 V output with ±1% accuracy at 25°C and ±1.5% over the full −40°C to +85°C operating range. This precision is achieved using an internal trimmed bandgap reference and feedback network, ensuring stable voltage for noise-sensitive analog circuits without external resistor networks.

Is the NCP4586SN285T1 pin-compatible with other variants in the NCP4586 family?

No - the NCP4586SN285T1 uses the SOT-23-5 package with pin 4 designated NC (no connection), while UDFN4 and SC-82AB variants have different pinouts and terminal counts. Pin compatibility exists only within the same package type (e.g., other SOT-23-5 versions like NCP4586DSN28T1G), but voltage and enable logic may differ.

Does the NCP4586SN285T1 include auto-discharge functionality?

Yes - the NCP4586SN285T1 is the "D" version (denoted by "D" in ordering code), which integrates an internal N-channel transistor between VOUT and GND. When the CE pin is driven high (disable state), this transistor actively discharges the output capacitor, eliminating residual voltage that could cause latch-up or false wake-up in downstream circuitry.

What is the minimum input voltage required for regulation at full load with the NCP4586SN285T1?

At 150 mA load, the NCP4586SN285T1 requires a minimum input voltage of 3.17 V (2.85 V + 320 mV typical dropout). Under worst-case conditions (e.g., high temperature or process variation), the dropout may reach 510 mV, so 3.36 V input is recommended for guaranteed regulation across all conditions.

Can the NCP4586SN285T1 operate with ceramic output capacitors smaller than 1 µF?

Yes - the NCP4586SN285T1 is explicitly characterized for stability with a 0.47 µF ceramic output capacitor, as confirmed in the datasheet's Electrical Characteristics table and Application Information section. Using ≥0.47 µF X5R/X7R ceramics placed adjacent to VOUT and GND pins ensures phase margin >45° and avoids oscillation.