onsemi NCP4680DSQ08T1G

Overview

NCP4680DSQ08T1G from onsemi is a 150 mA, low-noise, low-dropout linear voltage regulator with fixed 0.8 V output, ±1.0% accuracy, 75 dB PSRR at 1 kHz, and 0.25 V dropout (at 150 mA, 2.5 V output). It features chip enable (active-high), current fold-back protection, and stable operation with 0.1 µF ceramic capacitors - ideal for powering low-voltage logic in portable communication equipment.

For engineers reviewing the NCP4680DSQ08T1G datasheet, pinout, applications, or equivalent options, key selection considerations include its SC-70 package footprint, 0.8 V fixed output, auto-discharge capability, thermal performance (R_JA = 263 °C/W), and compatibility with battery-powered systems requiring tight regulation and low quiescent current (50 µA typical).

Technical Context

The NCP4680DSQ08T1G implements a CMOS-based LDO architecture with an internal N-channel pass transistor, enabling ultra-low dropout and high PSRR across 10 Hz–100 kHz. Its active-high CE pin controls full shutdown with sub-1 µA standby current, and the D-version integrates an output discharge transistor to rapidly deplete V_OUT capacitance during disable.

Designed for input voltages from 1.40 V to 5.25 V, it maintains ±1.0% output accuracy over −40°C to +85°C ambient and delivers stable regulation even with minimal 0.1 µF ceramic output capacitance - eliminating need for tantalum or larger bulk caps in space-constrained designs.

Key Specifications

Pinout & Package

Package: SC-70-5 (Case 419A-02), 1.80 mm × 1.35 mm × 0.95 mm body, Pb-free, tape-and-reel (3000 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B082MR-G and AP7361-C0826S-7, the NCP4680DSQ08T1G uniquely combines 0.8 V regulation, SC-70 footprint, 75 dB PSRR, and integrated auto-discharge - making it optimal for space-constrained, noise-sensitive, fast-shutdown applications where output rail collapse timing is critical.

Availability

NCP4680DSQ08T1G is available at Aetrix Electronics and suitable for battery-powered IoT sensors, portable communication modules, and wearable health monitors requiring stable component supply with guaranteed long-term manufacturability.

Supply support for NCP4680DSQ08T1G 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 NCP4680 series belongs to onsemi's precision low-dropout regulator product line, engineered specifically for ultra-low-voltage, low-noise, and fast-transient-response power management in portable and space-constrained electronic systems.

FAQ

What is the maximum input voltage rating for the NCP4680DSQ08T1G?

The absolute maximum input voltage for the NCP4680DSQ08T1G is 6.0 V. Operation above this level risks permanent damage. The recommended operating input range is 1.40 V to 5.25 V, ensuring optimal regulation, PSRR, and thermal performance. For battery-powered designs, this allows safe use with single-cell Li-ion (up to 4.2 V) or two-cell alkaline (up to 3.2 V) without additional overvoltage protection.

Does the NCP4680DSQ08T1G require external compensation components?

No, the NCP4680DSQ08T1G is internally compensated and stable with only a 0.1 µF ceramic output capacitor. No external resistors, capacitors, or feedback networks are needed. This simplifies layout, reduces BOM cost, and eliminates tuning effort - a key advantage over adjustable LDOs that require precise external resistor matching for 0.8 V output.

How does the auto-discharge feature of the NCP4680DSQ08T1G operate?

When the CE pin is driven low, the NCP4680DSQ08T1G activates an internal NMOS transistor between VOUT and GND, sinking current to rapidly discharge the output capacitor. This reduces VOUT decay time from >10 ms (capacitor self-discharge only) to under 100 µs, preventing unintended logic states or latch-up in downstream circuits during power sequencing or sleep transitions.

Can the NCP4680DSQ08T1G be used with input voltages below 1.4 V?

No - the minimum recommended input voltage is 1.40 V. Below this, the internal circuitry cannot maintain regulation or guarantee specified performance (e.g., dropout, PSRR, accuracy). At 1.3 V input, the device may enter dropout or cease regulation entirely. For sub-1.4 V inputs, consider alternative architectures such as charge pumps or buck-boost regulators.

What is the thermal performance of the NCP4680DSQ08T1G in its SC-70 package?

The NCP4680DSQ08T1G has a junction-to-air thermal resistance (R_JA) of 263 °C/W in the SC-70 package. At 150 mA load and 2.5 V input (0.25 V dropout → 37.5 mW dissipation), junction temperature rise is ~9.9 °C above ambient - well within the −40°C to +150°C rating. Standard 1 oz copper with 25 mm² thermal pad keeps operation safe up to +85°C ambient.