onsemi NCP4682HMU28TCG

Overview

NCP4682HMU28TCG from onsemi is a 150 mA CMOS low-dropout linear voltage regulator with 2.8 V fixed output, ±0.8% output voltage accuracy, 0.24 V dropout at 150 mA, and ultra-low 1.0 µA quiescent current - designed for power-sensitive battery-powered systems requiring stable, low-noise supply rails.

For engineers reviewing the NCP4682HMU28TCG datasheet, pinout, applications, or equivalent options, key selection criteria include enable-pin logic (active-high CE), thermal performance in UDFN4 1.0×1.0 mm package, ceramic capacitor stability (≥0.1 µF), and fold-back current protection for short-circuit resilience.

Technical Context

The NCP4682HMU28TCG implements a CMOS-based LDO architecture with integrated chip-enable control and fold-back current limiting. Its active-high CE pin enables precise system-level power sequencing, while the internal N-channel pass transistor delivers low dropout and high PSRR (30 dB at 1 kHz).

It operates across 1.70–5.25 V input range and maintains ±40 ppm/°C output voltage temperature coefficient. The device is optimized for low-noise operation (70 µV_rms) and stable regulation with minimal external components - requiring only two 0.1 µF ceramic capacitors.

Key Specifications

Pinout & Package

Package: UDFN4 1.0 × 1.0 mm, 0.65 mm pitch, Pb-free, 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 XC6206P282MR-G, the NCP4682HMU28TCG uniquely combines 1.0 µA quiescent current, active-high CE, UDFN4 1.0×1.0 mm footprint, and guaranteed 2.8 V accuracy - making it optimal for space- and power-constrained battery systems requiring simple, direct GPIO control.

Availability

NCP4682HMU28TCG is available at Aetrix Electronics and suitable for wearable health sensors, IoT edge nodes, smart home camera modules, and industrial handheld scanners requiring stable component supply and long-term manufacturability.

Supply support for NCP4682HMU28TCG 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 NCP4682HMU28TCG belongs to onsemi's precision low-quiescent-current LDO family, engineered specifically for ultra-low-power battery-operated electronics where extended runtime, small form factor, and robust fault protection are essential.

FAQ

What is the maximum input voltage rating for the NCP4682HMU28TCG?

The absolute maximum input voltage for the NCP4682HMU28TCG is 6.0 V. However, per the datasheet's Electrical Characteristics note, continuous operation above 5.25 V is limited to ≤500 hours total. For reliable long-term use, the recommended operating input range is 1.70 V to 5.25 V. Exceeding 5.25 V risks accelerated degradation even if below 6.0 V absolute max.

Does the NCP4682HMU28TCG require an external pull-up resistor on the CE pin?

No, the NCP4682HMU28TCG does not require an external pull-up on the CE pin. It features an internal CE pull-down current source of 0.3 µA. When unused, the CE pin may be directly connected to VIN to ensure always-on operation - eliminating external components and saving board space.

Can the NCP4682HMU28TCG operate stably with a 0.047 µF output capacitor?

No. The NCP4682HMU28TCG requires a minimum 0.1 µF ceramic output capacitor for guaranteed stability, as specified in the datasheet's "Stable with Ceramic Capacitors" feature and Application Information section. Using 0.047 µF may cause oscillation or poor transient response, especially under load steps. Always use ≥0.1 µF X5R or X7R ceramic with low ESR.

What is the thermal performance difference between the UDFN4 and SC-82AB packages for the NCP4682HMU28TCG?

The UDFN4 package (used in NCP4682HMU28TCG) has R_JA = 250 °C/W, while the SC-82AB variant has R_JA = 263 °C/W. This 13 °C/W difference means the UDFN4 offers better thermal efficiency - enabling ~5% higher continuous output current at the same ambient temperature and PCB layout, or lower junction temperature rise under identical 150 mA load conditions.

Is the NCP4682HMU28TCG pin-compatible with other variants in the NCP4682 family?

Yes - all NCP4682 variants in the UDFN4 package (e.g., NCP4682HMU18TCG, NCP4682HMU33TCG) share identical pinout, footprint, and thermal pad configuration. Output voltage is set internally; no external resistors are involved. This allows voltage-scaling flexibility within the same PCB design without layout changes.