onsemi NCP3335ADM280R2G

Overview

NCP3335ADM280R2G from onsemi is a fixed-output, 2.8 V ultra-high-accuracy low-dropout regulator delivering 500 mA output current with ±0.9% initial accuracy at 25 °C, 260 mV typical dropout at full load, and stability with only 1.0 µF MLCC output capacitance. It serves as a precision power supply for noise-sensitive analog rails in portable consumer electronics.

For engineers reviewing the NCP3335ADM280R2G datasheet, pinout, applications, or equivalent options, key selection criteria include its no-minimum-load stability, reverse bias protection (7 V max), ultra-low shutdown current (0.07 µA), and NR pin-enabled noise reduction down to 36 µV_RMS.

Technical Context

The NCP3335ADM280R2G employs a PMOS pass transistor architecture enabling ultra-low dropout and eliminating minimum load requirements. Its internal reference is trimmed to ±0.9% over line, load, and temperature (−40 °C to +125 °C), and it integrates thermal shutdown, current limiting, and reverse bias protection that blocks >99.9% of reverse current when V_OUT − V_IN ≤ 7 V.

Stability is guaranteed across capacitor types-including ceramic, tantalum, and aluminum electrolytic-using only 1.0 µF output capacitance. The dedicated NR pin accepts a 10 nF capacitor to reduce output noise by up to 35% (e.g., from 52 µV_RMS to 36 µV_RMS at 500 mA), while the SD pin provides logic-level shutdown with 0.4 V OFF threshold and 2.0 V ON threshold.

Key Specifications

Pinout & Package

Package: Micro8 (Case 846A), 3.0 mm × 3.0 mm × 0.9 mm, thermally enhanced with exposed EPAD connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B282MR-G and AP2204K-2.8TRG1, the NCP3335ADM280R2G delivers tighter accuracy (±0.9% vs. ±2%), integrated reverse bias protection, and configurable noise reduction-making it preferable for high-integrity analog and battery-critical systems where reliability and signal integrity are prioritized over minimal footprint.

Availability

NCP3335ADM280R2G is available at Aetrix Electronics and suitable for smartphone baseband power, DSP core supply, and industrial sensor node applications requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.

Supply support for NCP3335ADM280R2G 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 is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The NCP3335A series was designed specifically for ultra-low-noise, high-accuracy power delivery in portable consumer electronics-emphasizing no-minimum-load operation, capacitor flexibility, and integrated protection features.

FAQ

What is the guaranteed accuracy of the NCP3335ADM280R2G over temperature?

The NCP3335ADM280R2G guarantees ±1.5% output voltage accuracy over the full operating junction temperature range of −40 °C to +125 °C, with ±0.9% typical accuracy at 25 °C. This is confirmed in the Electrical Characteristics table for the 2.8 V version under TA = −40 °C to +125 °C conditions, where V_OUT ranges from 2.758 V to 2.842 V.

Does the NCP3335ADM280R2G require an external capacitor on the NR pin?

No, the NR pin on the NCP3335ADM280R2G is optional. When left unconnected, the device operates with baseline noise performance (52 µV_RMS). Connecting a 10 nF capacitor from NR to GND reduces output noise to 36 µV_RMS, as measured per the datasheet's Electrical Characteristics section for the 2.8 V version.

Can the NCP3335ADM280R2G operate with a 2.6 V input voltage?

Yes, the NCP3335ADM280R2G supports input voltages from 2.6 V to 12 V. At 2.6 V input, it maintains regulation down to ~200 mA output (per Figure 19), making it suitable for single-cell Li-ion applications near end-of-discharge, provided the dropout headroom (V_IN − V_OUT ≥ 340 mV at full load) is maintained.

How does reverse bias protection work on the NCP3335ADM280R2G?

The NCP3335ADM280R2G blocks reverse current flow from V_OUT to V_IN when V_OUT − V_IN ≤ 7 V, limiting reverse current to ≤10 µA (I_OUTR). This prevents damage during hot-swap events or when backup capacitors hold V_OUT high while V_IN collapses - a feature absent in most standard LDOs.

Is the NCP3335ADM280R2G stable with ceramic capacitors smaller than 1.0 µF?

No - the NCP3335ADM280R2G requires a minimum 1.0 µF output capacitance for guaranteed stability, as explicitly stated in the datasheet Features list and validated in Figures 27–28. Using <1.0 µF violates the stability condition and may cause oscillation, even with low-ESR MLCCs.