onsemi NCP4680DSQ30T1G

Overview

NCP4680DSQ30T1G from onsemi is a 150 mA, low-noise, low-dropout linear voltage regulator in SC-70 package with fixed 3.0 V output, ±1.0% accuracy, 0.23 V dropout at 150 mA, and 75 dB PSRR at 1 kHz-designed for power supply in battery-powered communication equipment.

For engineers reviewing the NCP4680DSQ30T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage under full load, CE pin logic threshold, thermal resistance (263 °C/W), ceramic capacitor stability (≥0.1 µF), and auto-discharge capability in D-version variants.

Technical Context

The NCP4680DSQ30T1G implements a CMOS-based LDO architecture with fold-back current limiting and an integrated chip-enable (CE) input that activates high. Its internal reference and error amplifier deliver tight output regulation across temperature and line/load variations.

As a D-series variant, it includes an output discharger transistor between VOUT and GND, enabling rapid discharge of output capacitance during shutdown-critical for systems requiring controlled power sequencing and fast turn-off response.

Key Specifications

Pinout & Package

Package: SC-70 (Case 419A−02), 5-pin, Pb-free, 1.8 mm × 1.35 mm footprint with exposed thermal pad connected to GND.

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 NCP4680DSQ30T1G uniquely combines 150 mA capability, integrated CE control, and auto-discharge in a 5-pin SC-70-enabling simpler, more reliable power sequencing in space-constrained portable designs without external components.

Availability

NCP4680DSQ30T1G is available at Aetrix Electronics and suitable for battery-powered equipment, networking hardware, and consumer imaging devices requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for NCP4680DSQ30T1G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP4680DSQ30T1G belongs to the NCP4680 family of low-noise, auto-discharge LDOs-engineered specifically for portable and battery-sensitive systems where power sequencing, low quiescent current, and rapid output discharge are essential.

FAQ

What is the maximum input voltage rating for the NCP4680DSQ30T1G?

The NCP4680DSQ30T1G has an absolute maximum input voltage (VIN) rating of 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-ensuring proper regulation and thermal safety across all load and temperature conditions for the NCP4680DSQ30T1G.

Does the NCP4680DSQ30T1G require an external resistor divider for output voltage setting?

No, the NCP4680DSQ30T1G is a fixed-output regulator with factory-trimmed 3.0 V output-no external resistors are needed. The device uses an internal precision reference and feedback network. This simplifies design, improves accuracy (±1.0%), and eliminates drift from external component tolerances-making the NCP4680DSQ30T1G ideal for space- and cost-sensitive applications.

How does the auto-discharge feature work in the NCP4680DSQ30T1G?

When the CE pin is driven low, the NCP4680DSQ30T1G activates an internal NMOS transistor between VOUT and GND, rapidly discharging the output capacitor. This reduces VOUT to near-zero within microseconds-preventing unintended wake-up or latch-up in downstream circuitry. Unlike standard LDOs, this eliminates the need for external bleed resistors or MOSFETs, directly enhancing system-level power sequencing reliability for the NCP4680DSQ30T1G.

Can the NCP4680DSQ30T1G operate stably with a 0.1 µF ceramic output capacitor?

Yes-the NCP4680DSQ30T1G is explicitly characterized and guaranteed stable with a minimum 0.1 µF ceramic output capacitor (X5R/X7R). Larger values improve transient response but are not required. Using tantalum or aluminum electrolytic capacitors is discouraged due to high ESR, which may cause oscillation. This capacitor compatibility simplifies BOM and layout for the NCP4680DSQ30T1G.

What is the thermal resistance (R_JA) of the NCP4680DSQ30T1G in its SC-70 package?

For the NCP4680DSQ30T1G in SC-70 (Case 419A), the junction-to-air thermal resistance R_JA is 263 °C/W. This value assumes standard JEDEC test board conditions. With 150 mA output at 3.0 V and 3.23 V input (0.23 V dropout), power dissipation is ~34.5 mW-resulting in ~9.1 °C junction-to-ambient rise above ambient. Adequate PCB copper pour further lowers actual R_JA for the NCP4680DSQ30T1G in production layouts.