onsemi NCP694DSANADJT1G

Overview

NCP694DSANADJT1G from onsemi is an adjustable-output, 1 A CMOS low-dropout linear voltage regulator in HSON-6 package with enable control and built-in auto-discharge function. It delivers stable output down to 1.0 V, achieves −3 mV load regulation at 1 A, supports input up to 6.0 V, and features ultra-low standby current (≤1.0 µA) for portable battery-powered systems.

For engineers reviewing the NCP694DSANADJT1G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions for HSON-6, confirmed dropout performance at 1 A, real-world thermal characteristics, and two rigorously cross-checked alternative regulators for adjustable LDO designs.

Technical Context

The NCP694DSANADJT1G implements a PMOS pass transistor architecture enabling ultra-low dropout voltage-0.56 V typical at 1 A output-and integrates internal current limiting, thermal shutdown (150°C), and a precision 1.0 V reference for adjustable output configuration. Its CE pin enables fast, logic-controlled standby mode with sub-µA quiescent current.

This D-version device includes dedicated auto-discharge circuitry that actively discharges the output capacitor when disabled, preventing residual voltage hold-up in power sequencing-critical applications. The HSON-6 package provides dual VOUT pins (pins 1 & 2) for enhanced current handling and reduced PCB trace resistance.

Key Specifications

Pinout & Package

HSON-6 package (Case 506AE), 3.0 mm × 3.0 mm × 0.9 mm body, exposed thermal pad, Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1826T-ADJ/DC and TLS850B2TE/V33, the NCP694DSANADJT1G uniquely combines 1 A output, sub-µA standby, and auto-discharge in a compact HSON-6 package-making it optimal for high-current, battery-constrained portable electronics where rapid, clean power cycling is mandatory.

Availability

NCP694DSANADJT1G is available at Aetrix Electronics and suitable for battery-powered medical sensors, wearable health monitors, industrial handheld scanners, portable test & measurement equipment, and IoT edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for NCP694DSANADJT1G 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 NCP694DSANADJT1G belongs to the NCP694 series of super-low-dropout LDOs engineered specifically for portable battery-powered devices demanding high output current, ultra-low quiescent power, and fast, clean enable/disable behavior.

FAQ

What output voltage range does the NCP694DSANADJT1G support?

The NCP694DSANADJT1G is an adjustable-output LDO with a minimum output voltage of 1.0 V and maximum up to the input voltage (VIN), enabled by its internal 1.0 V reference and external resistor divider. It does not support outputs below 1.0 V, unlike fixed versions which go down to 0.8 V. This 1.0–VIN range suits core supplies for modern low-voltage MCUs and sensors.

How does the auto-discharge feature work on the NCP694DSANADJT1G?

When the CE pin is pulled low, the NCP694DSANADJT1G activates an internal NMOS transistor between VOUT and GND, actively discharging the output capacitor. This eliminates residual voltage that could interfere with downstream logic or cause latch-up. The discharge time depends on capacitor value and ESR but typically occurs within milliseconds-critical for reliable power sequencing in multi-rail systems.

What is the maximum input voltage rating for the NCP694DSANADJT1G?

The absolute maximum input voltage for the NCP694DSANADJT1G is 6.5 V, with recommended operating input range of 1.4 V to 6.0 V. Exceeding 6.5 V risks permanent damage. For robust design, maintain ≥0.5 V margin-e.g., use with 5.5 V max input sources such as USB-powered systems or regulated 5 V rails.

Can the NCP694DSANADJT1G be used without connecting the ADJ pin?

No-the ADJ pin must be connected to the feedback resistor divider to set the output voltage; leaving it floating or unconnected will result in undefined or unstable regulation. If a fixed output is required, select a fixed-version part (e.g., NCP694DSAN33T1G for 3.3 V). The "NC" designation in documentation refers only to cases where the pin is unused *and* intentionally left open-not as a default connection state.

What thermal performance can be expected from the NCP694DSANADJT1G in HSON-6 package?

In standard JEDEC conditions (1 oz copper, 100 mm² spread area), the NCP694DSANADJT1G has a junction-to-ambient thermal resistance (R_JA) of 111°C/W and a maximum power dissipation of 900 mW. At 1 A output with 1 V dropout (1 W dissipation), junction temperature rise would exceed safe limits-so derating is required. Real-world layouts with enhanced copper pours or thermal vias can reduce R_JA to ~60°C/W, enabling full 1 A operation at ambient ≤60°C.