onsemi NCP4671DMX06TCG

Overview

NCP4671DMX06TCG from onsemi is a 400 mA dual-rail ultra-low dropout linear regulator with fixed 0.6 V output, designed for low-voltage core power in portable electronics. It features separate VBIAS and VIN inputs, 180 mV typical dropout at 400 mA, ±15 mV output accuracy at 25°C, and operates down to 0.9 V input voltage. Its XDFN6 package (1.2 × 1.2 × 0.4 mm) supports space-constrained battery-powered applications.

For engineers reviewing the NCP4671DMX06TCG datasheet, pinout, applications, or equivalent options, key selection criteria include bias-input separation for ultra-low dropout, auto-discharge capability, thermal performance in XDFN6, and compatibility with sub-1V input rails in mobile SoC power domains.

Technical Context

The NCP4671DMX06TCG implements a dual-rail architecture where VBIAS powers the control circuitry independently from VIN-the main power path-enabling stable regulation even when VIN drops as low as 0.9 V. This architecture decouples PSRR contributions: 80 dB at 1 kHz from VIN ripple and 50 dB from VBIAS ripple.

It integrates chip-enable (CE) logic with internal pull-down, supports fast load transients (e.g., <200 µs recovery for 1 mA → 400 mA step), and includes current-foldback protection (120 mA typ.) and UVLO on VIN. The D-version variant provides an integrated output discharge transistor activated during disable.

Key Specifications

Pinout & Package

XDFN6 package: 1.2 mm × 1.2 mm × 0.4 mm, Pb-free, wettable flank compatible. Exposed thermal pad (pin 5) must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B062MR-G and RT9080L-0.6GJ5, the NCP4671DMX06TCG uniquely supports 0.9 V VIN via dual-rail architecture and delivers guaranteed 0.1 µA standby current with built-in discharge-critical for energy-harvesting and long-life battery systems.

Availability

NCP4671DMX06TCG is available at Aetrix Electronics and suitable for portable medical monitors, wearable fitness trackers, and industrial edge node controllers requiring stable component supply with Pb-free compliance and automotive-grade reliability screening.

Supply support for NCP4671DMX06TCG 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The NCP4671DMX06TCG belongs to onsemi's precision analog LDO family, engineered specifically for ultra-low-voltage core regulation in next-generation portable and battery-constrained systems.

FAQ

What is the minimum input voltage required for NCP4671DMX06TCG to regulate 0.6 V output?

The NCP4671DMX06TCG supports a minimum VIN of 0.9 V when VBIAS ≥ 2.4 V. This is enabled by its dual-rail architecture-VBIAS powers the control circuitry separately, allowing regulation even when VIN is only 300 mV above VOUT. For reliable startup, VIN must exceed VOUT + 0.1 V when VBIAS ≥ VOUT + 1.6 V, per datasheet Section 3.

Does NCP4671DMX06TCG require external capacitors, and what values are recommended?

Yes, NCP4671DMX06TCG requires three external ceramic capacitors: 1.0 µF on VIN, 1.0 µF on VBIAS, and ≥2.2 µF on VOUT. All must be placed within 2 mm of their respective pins. Larger COUT values improve load transient response; tantalum capacitors are discouraged due to ESR-related instability risks cited in Application Information Section 19.

How does the auto-discharge feature of NCP4671DMX06TCG operate?

The NCP4671DMX06TCG (D-version) integrates an N-channel transistor between VOUT and GND. When CE is driven low, this transistor turns on and actively discharges the output capacitor. Typical discharge time to 5% of VOUT is <100 µs with a 2.2 µF ceramic capacitor, eliminating hold-up voltage that could delay system reset or cause latch-up in downstream logic.

Can NCP4671DMX06TCG be used with a VBIAS rail lower than 2.4 V?

No. For 0.6 V output, the datasheet specifies VBIAS must be ≥2.4 V (Section 3, "Bias Supply Voltage Range"). Using VBIAS < 2.4 V violates Absolute Maximum Ratings and may cause improper biasing of internal references, leading to output inaccuracy or dropout failure. VBIAS must also remain ≤6.0 V per Absolute Maximum Ratings Table.

What thermal derating applies to NCP4671DMX06TCG in its XDFN6 package at 400 mA?

With R_JA = 250 °C/W and 400 mA load at 0.6 V output (240 mW dissipation), junction temperature rise is ~60°C above ambient. At T_A = 85°C, T_J ≈ 145°C-within the 150°C maximum. Derating is required above 85°C ambient; full 400 mA is not sustainable at 100°C ambient without enhanced PCB copper or airflow per Thermal Characteristics Table on page 3.