onsemi NCP4682DMU19TCG

Overview

NCP4682DMU19TCG from onsemi is a 150 mA ultra-low-quiescent-current CMOS low-dropout linear regulator with 1.9 V fixed output voltage, ±0.8% output accuracy, and integrated chip enable (CE) function. It operates from 1.70 V to 5.25 V input, delivers 0.24 V dropout at 150 mA (V_OUT = 2.8 V), and features current fold-back protection - ideal for battery-powered microcontroller core rails in portable IoT sensors.

For engineers reviewing the NCP4682DMU19TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.0 µA quiescent current (active), 0.1 µA standby current, UDFN4 1.0 × 1.0 mm package, auto-discharge capability, and compatibility with 0.1 µF ceramic output capacitors.

Technical Context

The NCP4682DMU19TCG implements a CMOS-based LDO architecture with internal reference, error amplifier, and pass transistor. Its CE pin enables active-high control of regulation, while the integrated output discharger (NCP4682D variant) rapidly bleeds stored charge from the output capacitor during shutdown - critical for system-level power sequencing in space-constrained designs.

Thermal performance is defined by R_JA = 250 °C/W (UDFN4), and stability is guaranteed with ≥0.1 µF ceramic output capacitance. The device meets AEC-Q100 stress test standards for ESD (2000 V HBM) and latch-up, supporting industrial-grade reliability in ambient temperatures from −40 °C to +85 °C.

Key Specifications

Pinout & Package

Package: UDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed thermal pad (GND-connected). Pin 1 (VOUT), Pin 2 (GND), Pin 3 (CE), Pin 4 (VIN). Tab is GND level and recommended to be connected to PCB ground plane for optimal thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1902E/TT and XC6206P192MR-G, the NCP4682DMU19TCG uniquely integrates both ultra-low IQ and auto-discharge in a 1.0 × 1.0 mm UDFN4 package - delivering superior power sequencing control and minimal board area for next-generation compact electronics.

Availability

NCP4682DMU19TCG is available at Aetrix Electronics and suitable for battery-powered wearables, industrial sensor nodes, smart home cameras, and medical diagnostic handhelds requiring stable component supply with guaranteed long-term sourcing.

Supply support for NCP4682DMU19TCG 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-I_Q LDO portfolio, engineered specifically for battery-critical applications where extended runtime, precise voltage regulation, and fast power-state transitions are essential.

FAQ

What is the maximum input voltage rating for the NCP4682DMU19TCG?

The absolute maximum input voltage for the NCP4682DMU19TCG is 6.0 V. However, per the datasheet, continuous operation above 5.25 V is limited to ≤500 hours total lifetime. For reliable long-term use, the recommended operating input voltage range remains 1.70 V to 5.25 V. Exceeding 5.25 V risks accelerated degradation even if below 6.0 V absolute max.

Does the NCP4682DMU19TCG support ceramic output capacitors?

Yes, the NCP4682DMU19TCG is fully stable with ≥0.1 µF ceramic output capacitors - no ESR requirements or damping resistors needed. This eliminates reliance on larger, less reliable tantalum or aluminum electrolytic capacitors and reduces solution size and cost. The datasheet confirms stability across all output voltages in the 1.2 V–3.3 V range using standard X5R/X7R ceramics.

How does the auto-discharge feature work in the NCP4682DMU19TCG?

The NCP4682DMU19TCG (D-version) integrates an internal N-channel transistor between VOUT and GND. When the CE pin is driven low, the regulator disables and the transistor turns on, actively discharging the output capacitor. This ensures rapid VOUT decay - typically within microseconds - preventing unintended wake-up or latch-up in downstream circuitry during power-down sequences.

What is the dropout voltage of the NCP4682DMU19TCG at 150 mA load?

The NCP4682DMU19TCG datasheet specifies dropout voltage for the 1.9 V version as ≤0.32 V (max) at 150 mA output current. While the exact 1.9 V curve isn't plotted in Figure 7–10, interpolation from adjacent 1.8 V and 2.0 V data confirms this value. At room temperature and 150 mA, typical dropout is ~0.26 V, enabling operation down to ~2.16 V input under full load.

Is the CE pin of the NCP4682DMU19TCG compatible with 1.8 V logic levels?

Yes. The CE pin has a guaranteed high-threshold voltage (V_CEH) of ≥1.5 V and low-threshold (V_CEL) of ≤0.3 V. Since 1.8 V GPIO outputs typically swing from 0 V to 1.8 V, they exceed the 1.5 V minimum required to assert CE high - enabling direct interfacing without level shifters. The internal CE pull-down current (0.3 µA) also ensures robust low-state definition.