onsemi NCP103AMX310TCG

Overview

NCP103AMX310TCG from onsemi is a 150 mA CMOS low-dropout (LDO) regulator with fixed 3.1 V output, optimized for battery-powered portable electronics. It delivers ±1% output accuracy at room temperature, 75 mV typical dropout at 150 mA load, and 75 dB PSRR at 1 kHz - enabling stable power delivery in noise-sensitive RF and analog subsystems of smartphones and wireless handsets.

For engineers reviewing the NCP103AMX310TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its active output discharge function (enabled only in "A"-suffix variants), ultra-low 50 µA typical quiescent current, thermal shutdown protection, and compatibility with 1 µF ceramic output capacitors in space-constrained uDFN4 1.0×1.0 mm packages.

Technical Context

The NCP103AMX310TCG employs a PMOS pass transistor architecture with dynamic quiescent current adjustment, enabling ultra-low IQ across input voltage (1.7–5.5 V) and load conditions. Its internal bandgap reference and error amplifier deliver tight regulation under varying junction temperature (−40°C to +85°C) and line/load transients.

This variant includes an integrated active output discharge transistor (R_DIS = 100 Ω), activated during shutdown (EN < 0.4 V), ensuring rapid V_OUT decay to GND - critical for sequencing-sensitive systems. Protection features include current limiting (550 mA typ.), thermal shutdown (160°C trip), and reverse-current blocking via the PMOS body diode.

Key Specifications

Pinout & Package

Package: uDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed pad (EPAD) for thermal dissipation. RoHS-compliant, Pb-free, halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3102E/TT and XC6206P312MR-G, the NCP103AMX310TCG uniquely combines 3.1 V precision regulation, active output discharge, and 75 dB PSRR in a 1.0×1.0 mm uDFN - making it optimal for space-constrained, multi-rail portable systems requiring clean, controllable power.

Availability

NCP103AMX310TCG is available at Aetrix Electronics and suitable for smartphone power management, wireless audio subsystems, portable medical instrumentation, and industrial IoT sensor nodes requiring stable component supply with full lifecycle support.

Supply support for NCP103AMX310TCG 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 intelligent edge applications.

The NCP103 series is designed specifically for ultra-low-power, noise-sensitive portable electronics - delivering high PSRR, minimal quiescent current, and robust protection in miniature packages for next-generation mobile and wearable devices.

FAQ

What is the output voltage tolerance of the NCP103AMX310TCG over temperature?

The NCP103AMX310TCG maintains ±2% output voltage accuracy across −40°C to +85°C junction temperature. At room temperature (25°C), it achieves ±1% tolerance. This specification is validated per the Electrical Characteristics table in the official onsemi datasheet (Rev. 16, August 2024), ensuring reliable biasing for 3.3 V I/O interfaces without external trimming. The NCP103AMX310TCG uses a precision bandgap reference and curvature-compensated error amplifier to minimize drift.

Does the NCP103AMX310TCG support active output discharge, and how does it behave?

Yes - the NCP103AMX310TCG includes active output discharge, a feature exclusive to "A"-suffix variants. When the EN pin is driven below 0.4 V, the internal 100 Ω discharge transistor connects OUT to GND, pulling V_OUT to near-zero within microseconds. This prevents floating outputs and ensures safe power-down sequencing in multi-voltage systems. The NCP103AMX310TCG's discharge behavior is characterized in Figure 40 and Application Information section.

What is the minimum recommended output capacitor for stable operation of the NCP103AMX310TCG?

The NCP103AMX310TCG is stable with a minimum 1 µF X5R or X7R ceramic capacitor (MLCC) placed close to the OUT pin. The datasheet confirms stability down to 0.22 µF effective capacitance, accounting for DC bias and temperature derating - especially important for 0402-size capacitors. Using smaller values risks oscillation; tantalum capacitors are discouraged due to high ESR. The NCP103AMX310TCG's internal compensation eliminates external components.

Can the NCP103AMX310TCG operate from a single-cell Li-ion battery throughout its full discharge curve?

Yes - the NCP103AMX310TCG operates from 1.7 V to 5.5 V input and delivers 3.1 V output with only 70 mV typical dropout at 150 mA. This allows continuous regulation down to VIN = 3.17 V, covering >90% of a standard 3.0–4.2 V Li-ion discharge profile. Below 3.17 V, the device enters dropout but remains functional until VIN falls below 1.7 V. The NCP103AMX310TCG's low IQ further extends usable runtime in partial-discharge states.

How does the thermal shutdown protection work in the NCP103AMX310TCG?

The NCP103AMX310TCG triggers thermal shutdown at 160°C (typical) junction temperature and resets at 140°C (typical), providing 20°C hysteresis. During shutdown, the pass transistor turns off and the active discharge transistor engages. This protects against sustained overload, poor PCB copper area, or ambient temperature extremes. The NCP103AMX310TCG's R_JA is 170°C/W on 1 oz FR-4 with 645 mm² copper - design guidance is provided in Figure 42 and Thermal Characteristics section.