onsemi NCP605MNADJT2G

Overview

NCP605MNADJT2G from onsemi is an adjustable-output, 500 mA low-dropout (LDO) linear regulator without enable functionality, designed for space-constrained portable battery-powered systems. It delivers 1.25 V to 5.0 V output via external resistor divider, features 450 mV dropout at 500 mA (1.25 V output), ±1.5% output voltage tolerance, and operates from 1.5 V to 6.0 V input. It is used in notebook computers and portable instrumentation where low ground current and low noise are critical.

For engineers reviewing the NCP605MNADJT2G datasheet, pinout, applications, or equivalent options, key selection considerations include its fixed-no-enable architecture, DFN6 3×3.3 mm package with exposed thermal pad, 145 µA typical ground current independent of load, 50 µV_RMS integrated output noise (10 Hz–100 kHz), and thermal shutdown at 175°C.

Technical Context

The NCP605MNADJT2G employs a CMOS-based pass transistor architecture with internal current limiting (675 mA) and thermal shutdown protection. Its SENSE/ADJ pin serves as the feedback node for adjustable configurations, requiring connection to the midpoint of an external R1/R2 resistor divider to set output voltage per V_OUT = 1.25 × (1 + R1/R2).

It lacks an enable pin-pin 3 is NC-and relies on VIN supply presence for operation. Input-to-output differential must exceed dropout voltage (e.g., ≥450 mV at 500 mA for 1.25 V output) to maintain regulation, and it achieves 62 dB PSRR at 120 Hz with 1 µF ceramic output capacitance.

Key Specifications

Pinout & Package

Package: DFN6 3.0×3.3 mm, 0.95 mm pitch, exposed thermal pad (EPAD) connected to GND (Case 506AX). Requires soldering to PCB copper for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1202E/MB and TLC7701QD, the NCP605MNADJT2G uniquely combines 500 mA output, true adjustability down to 1.25 V, ultra-low IGND, and no-enable simplicity-making it optimal for compact, high-current, battery-sensitive LDO applications where flexibility and efficiency are prioritized over supervision features.

Availability

NCP605MNADJT2G is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery-powered medical sensors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for NCP605MNADJT2G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP605MNADJT2G belongs to onsemi's NCP605/NCP606 family of low-IGND CMOS LDOs, engineered specifically for portable battery-powered devices demanding high PSRR, low noise, and minimal quiescent current without enable complexity.

FAQ

What output voltage range does the NCP605MNADJT2G support?

The NCP605MNADJT2G supports an adjustable output voltage range from 1.25 V to 5.0 V, set using an external resistor divider connected to the SENSE/ADJ pin. It does not offer fixed-output variants-only the adjustable configuration is available under this part number. The relationship follows V_OUT = 1.25 × (1 + R1/R2), with R1 and R2 selected to achieve the target voltage while minimizing error from the <150 nA ADJ pin bias current.

Does the NCP605MNADJT2G have an enable pin?

No, the NCP605MNADJT2G does not have an enable pin. Pin 3 is designated NC (No Connect) and must remain unconnected. This distinguishes it from the NCP606 series, which includes an active-high EN pin. Operation of the NCP605MNADJT2G is solely controlled by the presence of valid input voltage on VIN pins 1 and 6-no external logic control is possible.

What is the maximum output current capability of the NCP605MNADJT2G?

The NCP605MNADJT2G delivers up to 500 mA of continuous output current, provided VIN pins 1 and 6 are externally shorted and adequate PCB copper area is used for thermal dissipation. Its current limit is 675 mA (typical), and short-circuit current is 700–1350 mA depending on conditions. Full-rated current requires proper thermal design-R_JA is 75°C/W on a 645 mm² 1 oz copper FR4 board.

Can the NCP605MNADJT2G operate with ceramic output capacitors?

Yes, the NCP605MNADJT2G is fully stable with low-ESR ceramic output capacitors and requires no minimum ESR. A minimum 1 µF X7R ceramic capacitor (e.g., Murata GRM219R71E105K) is recommended and should be placed adjacent to the VOUT and GND pins. Larger values improve load transient response and noise rejection-no tantalum or electrolytic capacitors are needed.

What thermal protection features does the NCP605MNADJT2G include?

The NCP605MNADJT2G integrates thermal shutdown that activates at approximately 175°C junction temperature, with 10°C hysteresis to prevent cycling. When triggered, the regulator disables output until junction temperature falls below ~165°C. This protection is independent of external circuitry and operates alongside internal current limiting (675 mA) to safeguard against overload, short circuit, or inadequate heatsinking.