onsemi NCP4680DMX33TCG

Overview

NCP4680DMX33TCG from onsemi is a 150 mA CMOS low-dropout linear voltage regulator with fixed 3.3 V output, housed in a Pb-free XDFN4 0.8×0.8 mm package. It delivers ±1.0% output voltage accuracy, 75 dB PSRR at 1 kHz, and 0.25 V dropout at 150 mA - optimized for noise-sensitive power rails in portable communication equipment.

For engineers reviewing the NCP4680DMX33TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its auto-discharge function (D-version), ceramic-capacitor stability (≥0.1 µF), chip-enable logic (active-high), and thermal performance in space-constrained layouts.

Technical Context

The NCP4680DMX33TCG implements a CMOS-based LDO architecture with internal fold-back current limiting and an integrated output discharge transistor activated during shutdown. Its control loop is optimized for fast line/load transient response - demonstrated by <50 µs recovery under 50–100 mA load steps and minimal output deviation (<15 mV) during 1–5 V input transients.

It operates across 1.40 V to 5.25 V input range with 3.3 V nominal output, supporting applications where input supply may dip near the regulated rail. The D-suffix denotes inclusion of an active VOUT-to-GND discharge path, reducing output decay time after disable - critical for sequencing in multi-rail systems.

Key Specifications

Pinout & Package

XDFN4 0.8×0.8 mm, 4-pin package with exposed thermal pad (connected to GND). Compact footprint supports high-density PCB layouts; recommended soldering per ON Semiconductor SOLDERRM/D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and XC6210B332MR-G, the NCP4680DMX33TCG uniquely combines XDFN4 size, auto-discharge, and 75 dB PSRR - making it optimal for compact, multi-rail embedded systems requiring clean, sequenced 3.3 V power.

Availability

NCP4680DMX33TCG is available at Aetrix Electronics and suitable for wireless sensor nodes, USB peripherals, HD camera modules, and industrial I/O systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for NCP4680DMX33TCG 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 innovation for automotive, industrial, cloud, and IoT applications.

The NCP4680DMX33TCG belongs to the NCP4680 family of low-noise, low-IQ LDOs designed specifically for space-constrained, battery-powered communication and imaging devices demanding high PSRR and precise voltage regulation.

FAQ

What is the maximum input voltage rating for the NCP4680DMX33TCG?

The NCP4680DMX33TCG has an absolute maximum input voltage of 6.0 V. Operation beyond this rating risks permanent damage. For reliable continuous use, the input voltage must remain within the recommended operating range of 1.40 V to 5.25 V - ensuring proper regulation and thermal safety at 150 mA load.

Does the NCP4680DMX33TCG require an external resistor divider for output voltage setting?

No, the NCP4680DMX33TCG is a fixed-output regulator with factory-trimmed 3.3 V. It does not use external feedback resistors. This simplifies design, improves accuracy (±1.0%), and eliminates drift from resistor tolerance or temperature coefficients - unlike adjustable LDOs such as the NCP4680AMX33TCG.

How does the auto-discharge feature of the NCP4680DMX33TCG operate?

When the CE pin is driven low, the NCP4680DMX33TCG activates an internal NMOS transistor between VOUT and GND. This discharges the output capacitor rapidly - reducing VOUT decay time from hundreds of milliseconds to <100 µs. This ensures deterministic reset timing in multi-voltage systems and prevents back-powering of upstream circuitry.

Can the NCP4680DMX33TCG be used with tantalum output capacitors?

No - the NCP4680DMX33TCG is optimized for ceramic capacitors ≥0.1 µF. Tantalum capacitors with high ESR can cause loop instability and oscillation, as noted in the datasheet's Application Information section. Using ceramic capacitors ensures guaranteed stability, faster transient response, and lower output noise compared to tantalum alternatives.

What is the thermal resistance (R_JA) of the NCP4680DMX33TCG in its XDFN4 package?

The NCP4680DMX33TCG in XDFN4 0.8×0.8 mm package has a thermal resistance of 350°C/W (junction-to-air). This value assumes standard JEDEC test board conditions. Effective thermal performance depends on PCB copper area under the exposed pad; adding ≥100 mm² of 2-oz copper connected to GND reduces R_JA significantly in real-world layouts.