onsemi NCP4680DMX30TCG

Overview

NCP4680DMX30TCG from onsemi is a 150 mA, low-noise, low-dropout linear voltage regulator with fixed 3.0 V output, housed in a 0.8 mm × 0.8 mm XDFN4 package. It delivers ±1.0% output voltage accuracy, 75 dB PSRR at 1 kHz, and 0.23 V dropout at 150 mA (V_OUT = 3.0 V), making it suitable for power-sensitive communication equipment and portable imaging systems.

For engineers reviewing the NCP4680DMX30TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its auto-discharge capability, ceramic-capacitor stability (≥0.1 µF), CE-active-high enable function, and thermal performance in compact XDFN4 layout.

Technical Context

The NCP4680DMX30TCG implements a CMOS-based LDO architecture with fold-back current limiting and an integrated output discharger transistor activated during shutdown. Its internal reference and error amplifier maintain regulation across −40°C to +85°C ambient temperature.

This variant belongs to the "D" version family, distinguished by the active-low output discharge path between V_OUT and GND during disable mode-critical for fast system-level power sequencing in battery-powered devices where residual output voltage must be cleared rapidly.

Key Specifications

Pinout & Package

Package: XDFN4, 0.8 mm × 0.8 mm, 0.48 mm pitch, exposed thermal pad (connected to GND). Compact footprint ideal for wearables and ultra-thin modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3002E/MB and XC6206P302MR-G, the NCP4680DMX30TCG uniquely combines auto-discharge, CE control, and sub-0.25 V dropout in a 0.64 mm² footprint-enabling tighter power domain isolation and faster system-level reset in space-constrained, multi-rail embedded designs.

Availability

NCP4680DMX30TCG is available at Aetrix Electronics and suitable for wireless sensor nodes, USB video peripherals, industrial camera controllers, and smart home hubs requiring stable component supply and rapid design-in support.

Supply support for NCP4680DMX30TCG 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP4680 series was designed for ultra-compact, low-noise power delivery in battery-powered and portable electronics-emphasizing minimal quiescent current, fast transient response, and integrated sequencing features like auto-discharge.

FAQ

What is the maximum input voltage rating for the NCP4680DMX30TCG?

The absolute maximum input voltage for the NCP4680DMX30TCG is 6.0 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended operating input range is 1.40 V to 5.25 V, which ensures proper regulation and thermal safety across all load and temperature conditions. The NCP4680DMX30TCG maintains 3.0 V output accuracy within this window.

Does the NCP4680DMX30TCG require external components to operate stably?

No external components beyond two 0.1 µF ceramic capacitors are required for stable operation of the NCP4680DMX30TCG: one at the input (C_IN) and one at the output (C_OUT). These must be placed as close as possible to their respective pins. Larger capacitance or lower-ESR ceramics improve transient response but are not mandatory. The NCP4680DMX30TCG does not require compensation networks or resistive feedback dividers due to its fixed 3.0 V output.

How does the auto-discharge feature work in the NCP4680DMX30TCG?

When the CE pin is driven low, the NCP4680DMX30TCG activates an internal NMOS transistor between V_OUT and GND, rapidly discharging the output capacitor. This action clears residual voltage from downstream loads within tens of microseconds-preventing unintended biasing, latch-up, or false wake-up events. The NCP4680DMX30TCG's D-version designation explicitly denotes this functionality, distinguishing it from non-discharge variants.

Can the NCP4680DMX30TCG be used with a 1.8 V input supply?

No-the NCP4680DMX30TCG cannot regulate 3.0 V output from a 1.8 V input. Its minimum dropout voltage is 0.23 V at 150 mA, requiring at least 3.23 V input for full-load regulation. At lighter loads, dropout decreases, but 1.8 V remains insufficient. For 1.8 V input, consider lower-output-voltage variants like NCP4680DMX18TCG (1.8 V) or alternative regulators with sub-1 V dropout.

Is the thermal pad on the NCP4680DMX30TCG package electrically connected?

Yes-the exposed thermal pad on the bottom of the NCP4680DMX30TCG's XDFN4 package is internally connected to GND. It must be soldered to a PCB ground plane to achieve specified thermal resistance (R_JA = 350°C/W) and prevent junction overheating under 150 mA load. Leaving the pad unconnected degrades thermal performance and may cause premature thermal shutdown.