onsemi NCP4671DMX09TCG

Overview

NCP4671DMX09TCG from onsemi is a 400 mA dual-rail ultra-low dropout linear regulator with fixed 0.9 V output, designed for low-voltage power delivery in space-constrained portable systems. It features a separate VBIAS input (2.4–5.25 V) and ultra-low VIN operating range (0.9 V), enabling operation directly from single-cell Li-ion or NiMH batteries. Its 180 mV typical dropout at 400 mA and ±15 mV output accuracy support stable core voltage regulation for microcontrollers and RF ICs.

For engineers reviewing the NCP4671DMX09TCG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, XDFN6 package layout, thermal performance data, enable-controlled sequencing behavior, and validated alternatives for battery-powered embedded designs requiring sub-1 V precision regulation.

Technical Context

The NCP4671DMX09TCG implements a dual-rail architecture: VIN supplies the pass transistor path while VBIAS powers the control circuitry-enabling ultra-low dropout (as low as 0.092 V at 400 mA for 0.9 V output) and high PSRR (80 dB at 1 kHz on VIN, 50 dB on VBIAS). This separation allows stable regulation even when VIN drops near VOUT.

It integrates chip-enable (CE) logic with internal pull-down, supports auto-discharge via integrated N-channel discharge transistor (D-version), and operates across −40°C to +85°C with ±20 mV total output voltage tolerance over temperature. The device is optimized for use downstream of DC/DC converters where VBIAS can be sourced from converter input rails.

Key Specifications

Pinout & Package

XDFN6 package: 1.2 mm × 1.2 mm × 0.4 mm, ultra-thin, Pb-free, with wettable flank terminals for automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout LDO applications.

Compared with XC6210B092MR-G and RP111Q091B-TR-F, the NCP4671DMX09TCG uniquely delivers dual-rail PSRR isolation, auto-discharge, and XDFN6 size with full 400 mA capability - making it optimal for noise-sensitive, battery-limited, and space-constrained applications demanding precise 0.9 V regulation.

Availability

NCP4671DMX09TCG is available at Aetrix Electronics and suitable for mobile camera modules, wearable health sensors, Bluetooth LE audio earbuds, industrial wireless sensor nodes, and other applications requiring stable component supply with tight voltage tolerance and ultra-low quiescent current.

Supply support for NCP4671DMX09TCG 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP4671DMX09TCG belongs to onsemi's ultra-low-dropout LDO family engineered specifically for next-generation portable electronics requiring sub-1 V core regulation with minimal board area and exceptional noise immunity.

FAQ

What is the minimum input voltage required for NCP4671DMX09TCG to regulate 0.9 V at 400 mA?

The NCP4671DMX09TCG requires VIN ≥ VOUT + dropout voltage. At 400 mA and TA = 25°C with VBIAS = 3.6 V, typical dropout is 0.180 V - so minimum VIN is 1.08 V. Per datasheet Table on page 4, VIN must be ≥ VOUT + 0.1 V (i.e., ≥ 1.0 V) when VOUT ≥ 0.8 V, confirming 1.08 V is the practical minimum for full-load regulation. The NCP4671DMX09TCG achieves this with its dual-rail architecture.

Does NCP4671DMX09TCG support automatic output discharge during shutdown?

Yes. The "D" in NCP4671DMX09TCG denotes the auto-discharge version. When CE is pulled low, an internal N-channel transistor connects VOUT to GND, actively discharging the output capacitor. This prevents residual voltage from interfering with system reset sequencing or causing unintended wake-up - a key feature confirmed in the "Output Discharger" section on page 19 of the datasheet.

Can NCP4671DMX09TCG operate with VBIAS = 2.4 V when regulating 0.9 V?

No. For VOUT ≥ 0.8 V, the datasheet specifies VBIAS must be ≥ VOUT + 1.6 V (page 3, Electrical Characteristics table). For 0.9 V output, minimum VBIAS is 2.5 V. Using 2.4 V violates the absolute minimum and risks improper regulation or instability. The NCP4671DMX09TCG requires VBIAS ≥ 2.5 V - e.g., 2.6 V, 3.3 V, or 3.6 V - to ensure reliable operation.

What is the thermal performance of NCP4671DMX09TCG in its XDFN6 package?

The XDFN6 package has R_JA = 250 °C/W (page 3, Thermal Characteristics). At 400 mA and 180 mV dropout, power dissipation is 72 mW, resulting in ~18°C junction-to-ambient rise above ambient - well within safe limits. No external heatsink is needed for typical PCB layouts with 1-in² 1-oz copper pour under the exposed pad. The NCP4671DMX09TCG's thermal design is optimized for compact, thermally constrained applications.

How does the dual-rail architecture of NCP4671DMX09TCG improve PSRR compared to single-rail LDOs?

The dual-rail architecture isolates the control circuitry (powered by VBIAS) from the power path (VIN), allowing independent PSRR optimization: 80 dB on VIN ripple and 50 dB on VBIAS ripple (page 3). This enables placement after noisy DC/DC converters - e.g., using converter input for VBIAS and output for VIN - suppressing noise from both sources. Single-rail LDOs cannot achieve this level of dual-path rejection. The NCP4671DMX09TCG leverages this to maintain signal integrity in mixed-signal systems.