onsemi NCP4586SN28T1

Overview

NCP4586SN28T1 from onsemi is a CMOS 150 mA low-dropout linear regulator with enable control (active-high), optimized for battery-powered portable electronics. It delivers a fixed 2.8 V output with ±1% accuracy at 25°C, 320 mV typical dropout at 150 mA, and 80 dB PSRR at 1 kHz - enabling stable power for noise-sensitive analog and RF circuitry in compact handheld devices.

For engineers reviewing the NCP4586SN28T1 datasheet, pinout, applications, or equivalent options, key selection considerations include its SOT-23-5 package footprint, active-high enable logic, auto-discharge capability, low 38 µA quiescent current, and compatibility with 0.47 µF ceramic output capacitors.

Technical Context

The NCP4586SN28T1 implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and P-channel pass transistor - eliminating external compensation requirements. Its enable input directly controls the pass device gate via internal logic, supporting fast startup (<20 ms) and controlled shutdown with output discharge.

This variant (D-series, "SN" suffix) integrates an internal N-channel discharge transistor between VOUT and GND, activated during disable to rapidly deplete output capacitance. It operates across −40°C to +85°C ambient, supports input voltages from 1.7 V to 6.5 V, and maintains regulation down to VIN = VOUT + 0.32 V at full load.

Key Specifications

Pinout & Package

Package: SOT-23-5 (Case 1212), 2.7 mm × 2.5 mm × 1.3 mm body, Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/TT and XC6219B282MR-G, the NCP4586SN28T1 uniquely combines 150 mA output, 38 µA IQ, active-high CE, and integrated auto-discharge in a standard SOT-23-5 - making it optimal for portable systems requiring coordinated power sequencing and fast state transitions.

Availability

NCP4586SN28T1 is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld scanners, and smart home remote sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP4586SN28T1 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP4586SN28T1 belongs to onsemi's NCP4586 family of low-noise, low-IQ LDOs designed specifically for battery-powered portable electronics where size, efficiency, and signal integrity are critical.

FAQ

What is the maximum input voltage rating for the NCP4586SN28T1?

The NCP4586SN28T1 has an absolute maximum input voltage of 7 V. Operation beyond this rating risks permanent damage. For reliable continuous use, the recommended operating input voltage range is 1.7 V to 6.5 V - ensuring proper regulation, thermal safety, and specified performance across temperature and load conditions. Always observe derating guidelines in the datasheet's Absolute Maximum Ratings table.

Does the NCP4586SN28T1 require an external capacitor on the CE pin for noise immunity?

No, the NCP4586SN28T1 does not require an external capacitor on the CE pin. Its enable input features built-in hysteresis and noise filtering, and the datasheet specifies V_CEH = 1.0 V (min) and V_CEL = 0.4 V (max) thresholds with 0.4 µA pull-down current for robust GPIO interfacing. Adding capacitance may slow enable/disable timing and is unnecessary unless system-level EMI testing indicates marginal immunity.

Can the NCP4586SN28T1 be used with a 1 µF ceramic output capacitor instead of the recommended 0.47 µF?

Yes, the NCP4586SN28T1 remains stable with a 1 µF ceramic output capacitor - and doing so improves load transient response and reduces output ripple. The datasheet guarantees stability with ≥0.47 µF; larger values (up to 10 µF) are acceptable and commonly used to enhance dynamic performance, provided ESR stays below 10 mΩ and the capacitor is placed close to the VOUT and GND pins.

Is the NC pin (Pin 4) on the NCP4586SN28T1 electrically isolated or tied internally?

The NC pin (Pin 4) on the NCP4586SN28T1 is electrically isolated - it is an unconnected, unbonded pad with no internal connection to silicon or package substrate. It must remain floating and unconnected in the PCB layout. Soldering or routing to this pin may cause parametric shifts, increased leakage, or field failure due to unintended coupling or mechanical stress.

How does the auto-discharge feature of the NCP4586SN28T1 behave during CE deactivation?

When CE is pulled low, the NCP4586SN28T1 disables regulation and activates its internal N-channel discharge transistor between VOUT and GND. This path sinks up to 40 mA, discharging a 1 µF output capacitor from 2.8 V to <0.1 V in under 100 µs. The discharge current is self-limiting and thermally protected - ensuring rapid, controlled VOUT collapse without overshoot or oscillation during system power-down sequences.