onsemi NCP4682DMU25TCG

Overview

NCP4682DMU25TCG from onsemi is a 150 mA, ultra-low-quiescent-current CMOS low-dropout linear regulator with 2.5 V fixed output, ±0.8% output voltage accuracy, 0.34 V dropout (at 150 mA), and integrated chip enable (CE) for power gating-designed for battery-powered portable electronics requiring stable, low-noise 2.5 V supply under light-load conditions.

For engineers reviewing the NCP4682DMU25TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.0 µA quiescent current, auto-discharge capability during shutdown, UDFN4 1.0×1.0 mm package, ceramic capacitor stability (≥0.1 µF), and CE-active-high control logic in space-constrained, energy-sensitive designs.

Technical Context

The NCP4682DMU25TCG implements a CMOS-based LDO architecture with internal fold-back current limiting and an integrated N-channel output transistor. Its CE input enables full shutdown with 0.1 µA standby current, while the auto-discharge function actively pulls VOUT to GND via an internal NMOS switch upon disable.

It operates across 1.70–5.25 V input range and maintains regulation down to 2.5 V output with ±40 ppm/°C temperature coefficient. The device achieves 30 dB PSRR at 1 kHz and 70 µV_RMS output noise (10 Hz–100 kHz), supporting noise-sensitive analog and RF subsystems.

Key Specifications

Pinout & Package

Package: UDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed thermal pad (Case 517BR), Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4682DMU25TCG, the SOT-23 variant trades miniaturization for ease of assembly and lacks auto-discharge, while the NCP4685 offers lower IQ but forfeits both enable control and output discharge-making the UDFN4 NCP4682DMU25TCG optimal for compact, battery-gated systems demanding rapid state transitions.

Availability

NCP4682DMU25TCG is available at Aetrix Electronics and suitable for wearable health sensors, smart home edge nodes, and industrial handheld scanners requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for NCP4682DMU25TCG 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 NCP4682 series belongs to onsemi's ultra-low-IQ LDO portfolio, engineered specifically for battery-powered portable electronics where extended runtime, small form factor, and controlled power sequencing are critical design requirements.

FAQ

What is the minimum input voltage required for NCP4682DMU25TCG to regulate 2.5 V output?

The NCP4682DMU25TCG requires a minimum input voltage of 2.84 V to maintain regulation at 150 mA load (2.5 V + 0.34 V dropout). At lighter loads, it can operate down to 1.70 V input, but output will drop below 2.5 V if VIN falls below (VOUT + VDO) - e.g., 2.5 V + 0.28 V = 2.78 V at 100 mA per datasheet Figure 8. Always verify dropout vs. load curve for your specific condition.

Does NCP4682DMU25TCG require an external pull-up resistor on the CE pin?

No, the NCP4682DMU25TCG does not require an external pull-up on CE. It features an internal CE pull-down current source (0.3 µA typical), so connecting CE directly to a GPIO or leaving it unconnected results in disable state. To enable, drive CE ≥1.5 V (e.g., from 1.8 V or 3.3 V MCU output). Pull-up resistors are unnecessary and may increase system IQ.

Can NCP4682DMU25TCG be used with a 0.22 µF X5R ceramic output capacitor?

Yes, NCP4682DMU25TCG is stable with any ceramic capacitor ≥0.1 µF, including 0.22 µF X5R. Larger values improve transient response and PSRR at higher frequencies. Ensure capacitor placement is within 2 mm of VOUT/GND pins and use low-ESR dielectric; avoid high-ESR types like standard electrolytics or aged tantalums which risk instability.

How does the auto-discharge feature work in NCP4682DMU25TCG?

When CE is driven low, the NCP4682DMU25TCG activates an internal NMOS transistor between VOUT and GND, discharging the output capacitor rapidly. This prevents residual voltage from powering downstream circuitry during sleep, eliminating unintended wake-ups or data corruption. Discharge time depends on C_OUT and load; typical discharge from 2.5 V to 0.1 V takes <1 ms with 1 µF capacitance.

Is NCP4682DMU25TCG compatible with lead-free reflow soldering profiles?

Yes, NCP4682DMU25TCG is Pb-free and qualified for standard lead-free reflow (J-STD-020D, peak 260°C). Its UDFN4 package supports IR and vapor-phase reflow. Follow onsemi's Soldering and Mounting Techniques Reference Manual (SOLDERRM/D) for recommended thermal profile, pad layout, and voiding mitigation-especially critical for the exposed thermal pad.