onsemi NCP103AMX285TCG

Overview

NCP103AMX285TCG from onsemi is a 150 mA CMOS low-dropout (LDO) regulator with fixed 2.85 V output, active output discharge function, and ultra-low quiescent current (50 µA typical). It operates from 1.7 V to 5.5 V input, delivers ±1% output accuracy at room temperature, and maintains stability with only a 1 µF ceramic output capacitor - ideal for space-constrained, battery-powered portable electronics requiring clean, regulated power.

For engineers reviewing the NCP103AMX285TCG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load (70–120 mV), enable threshold (0.4 V low / 0.9 V high), thermal shutdown (160 °C), PSRR (75 dB @ 1 kHz), and compatibility with 1 µF X5R/X7R MLCCs in uDFN4 1.0×1.0 mm packages.

Technical Context

The NCP103AMX285TCG integrates a PMOS pass transistor with dynamic quiescent current adjustment, enabling ultra-low IQ (50 µA typ.) at no-load while maintaining fast transient response. Its internal bandgap reference, active discharge MOSFET (100 Ω typical), and thermal shutdown circuit operate independently of external components.

This device uses a single-stage CMOS architecture without external compensation, relying on internal stability design for operation with 0.22 µF–10 µF ceramic capacitors. The EN pin controls both regulation and active discharge - pulling EN < 0.4 V disables regulation and engages discharge; > 0.9 V enables regulation and disables discharge.

Key Specifications

Pinout & Package

Package: uDFN4 1.0×1.0 mm, 0.65 mm pitch, exposed thermal pad (Case 517CU). Requires soldering exposed pad directly to GND plane for thermal performance (R_JA = 170 °C/W on 1 oz FR4).

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 NCP103AMX285TCG uniquely combines 2.85 V precision, active discharge, and EN control in a 1.0×1.0 mm uDFN - enabling compact, sequenced, and rapidly discharged power domains essential for modern portable electronics.

Availability

NCP103AMX285TCG is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, industrial handheld scanners, and smart remote controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP103AMX285TCG 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The NCP103 series is part of onsemi's precision analog portfolio, designed specifically for ultra-low-power, noise-sensitive portable electronics where small size, low IQ, and fast transient response are mandatory.

FAQ

What is the output voltage tolerance of the NCP103AMX285TCG across temperature and load?

The NCP103AMX285TCG delivers 2.85 V output with ±2% accuracy over −40°C to +85°C junction temperature and 1 mA to 150 mA load current. At room temperature, output voltage remains within ±1% (±28.5 mV), and line/load regulation contribute ≤30 mV total deviation - ensuring reliable operation for 2.8 V nominal logic and RF circuits.

Does the NCP103AMX285TCG require an external capacitor on the EN pin for noise immunity?

No, the NCP103AMX285TCG does not require an external capacitor on the EN pin. Its enable threshold is specified with hysteresis (0.4 V low / 0.9 V high), and the internal 300 nA pull-down current provides inherent noise margin. For noisy environments, a 100 kΩ series resistor plus 100 pF to GND may be added, but it is not required per the NCP103AMX285TCG datasheet.

Can the NCP103AMX285TCG be used with a 0402-size 1 µF X7R ceramic capacitor?

Yes, the NCP103AMX285TCG is fully stable with 0402 1 µF X7R ceramic capacitors. Its internal compensation is optimized for low-ESR MLCCs, and the datasheet confirms stability down to 0.22 µF effective capacitance - accommodating DC-bias derating typical of 0402 packages. This enables minimal footprint designs without compromising transient response.

What happens to the output when the NCP103AMX285TCG is disabled via the EN pin?

When the EN pin is pulled below 0.4 V, the NCP103AMX285TCG disables regulation and activates its internal 100 Ω active discharge transistor between OUT and GND. This pulls the output voltage to near ground within milliseconds (e.g., <1 ms for 1 µF COUT), preventing floating outputs or unintended power coupling in multi-rail systems - a key differentiator from LDOs without this feature.

Is the NCP103AMX285TCG compatible with input voltages below 1.7 V?

No, the NCP103AMX285TCG has a minimum operating input voltage of 1.7 V per absolute maximum ratings and electrical characteristics. Operation below 1.7 V risks undefined behavior, including failure to regulate or activate protection circuits. For sub-1.7 V applications, consider alternative LDOs such as the Torex XC6210B122MR-G (1.2 V output, 0.8 V min. VIN).