onsemi NCP4682DSQ28T1G

Overview

NCP4682DSQ28T1G from onsemi is a CMOS low-dropout linear voltage regulator delivering 150 mA output current with 2.8 V fixed output, ±0.8% accuracy, and 0.24 V dropout at full load. It features Chip Enable (CE) control, ultra-low 1.0 µA quiescent current, and current fold-back protection-designed for power-sensitive battery-powered systems requiring stable low-noise supply.

For engineers reviewing the NCP4682DSQ28T1G datasheet, pinout, applications, or equivalent options, key selection criteria include CE-controlled shutdown capability, ceramic-capacitor stability (≥0.1 µF), thermal performance in SC-82AB package, and compatibility with 1.7–5.25 V input rails in space-constrained portable designs.

Technical Context

The NCP4682DSQ28T1G implements a CMOS-based LDO architecture with integrated CE logic that enables active-high enable control and auto-discharge functionality during shutdown. Its internal reference and error amplifier deliver tight output regulation across temperature (±40 ppm/°C) and line/load variations (0.02%/V line reg, 20 mV load reg).

It integrates fold-back current limiting to protect against short-circuit and overcurrent events, and supports stable operation with low-ESR ceramic capacitors without requiring external compensation. The device operates within −40°C to +85°C ambient and features 2000 V HBM ESD rating per AEC-Q100-002.

Key Specifications

Pinout & Package

Package: SC-82AB (Case 419C), 3-pin surface-mount package measuring 1.8 × 1.3 × 0.9 mm (L × W × H), Pb-free, 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-2802E/MB and TPS70628DBVR, the NCP4682DSQ28T1G uniquely combines CE-controlled shutdown, auto-discharge, and sub-1.1 µA quiescent current in a 3-pin SC-82AB footprint-making it optimal for ultra-low-power, fast-sequencing battery systems where residual voltage management is critical.

Availability

NCP4682DSQ28T1G is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, USB-C peripheral hubs, and industrial data loggers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for NCP4682DSQ28T1G 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 power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP4682 series belongs to onsemi's ultra-low-I_Q LDO portfolio, engineered specifically for battery-powered portable electronics where extended runtime, rapid power sequencing, and minimal board space are primary design constraints.

FAQ

What is the output voltage tolerance of the NCP4682DSQ28T1G over temperature?

The NCP4682DSQ28T1G maintains ±0.8% output voltage accuracy at +25°C and ±1.5% over the full −40°C to +85°C operating range. This is specified in the Electrical Characteristics table under "Output Voltage" test conditions for TA = −40°C to 85°C, ensuring predictable performance in outdoor or industrial environments where ambient temperature varies widely. The device achieves this via a precision bandgap reference and low-drift error amplifier.

Does the NCP4682DSQ28T1G require an external pull-up resistor on the CE pin?

No, the NCP4682DSQ28T1G does not require an external pull-up resistor on the CE pin. It includes an internal pull-down current source (0.3 µA typical) that holds CE low when left unconnected. To enable the regulator, apply a logic-high voltage ≥1.5 V to CE. If CE is unused, connecting it directly to VIN ensures permanent enable-no external components needed.

Can the NCP4682DSQ28T1G operate with a 1.5 V input supply?

No, the NCP4682DSQ28T1G cannot operate with a 1.5 V input supply. Its minimum operating input voltage is 1.70 V per the Absolute Maximum Ratings and Electrical Characteristics tables. At 2.8 V output, the minimum functional input is 3.04 V (2.8 V + 0.24 V dropout). A 1.5 V input falls below both the operational threshold and the absolute minimum rating, resulting in no regulation or undefined behavior.

Is the NCP4682DSQ28T1G compatible with 0.22 µF ceramic output capacitors?

Yes, the NCP4682DSQ28T1G is fully compatible with 0.22 µF ceramic output capacitors-and any value ≥0.1 µF. The datasheet explicitly states stability with "0.1 µF or more" ceramic capacitors, and larger values improve load transient response and PSRR. X5R or X7R dielectrics are recommended for consistent capacitance across voltage and temperature.

What is the thermal resistance (R_JA) of the NCP4682DSQ28T1G in its SC-82AB package?

The thermal resistance (R_JA) of the NCP4682DSQ28T1G in the SC-82AB package is 263 °C/W, as specified in the Thermal Characteristics table. This value assumes standard JEDEC 2-layer board conditions. Actual junction temperature rise depends on PCB copper area, ground plane connectivity, and airflow; for continuous 150 mA operation at 2.8 V output, power dissipation is ~36 mW, yielding ~9.5°C rise above ambient under typical layout.