onsemi NCP693DMN12TCG

Overview

NCP693DMN12TCG from onsemi is a 1.2 V fixed-output, 1 A CMOS low-dropout linear regulator in a DFN-6 (1.8×2 mm) package, featuring ±1.0% output accuracy, ultra-low 65–90 µA quiescent current, and chip enable with auto-discharge function for fast turn-off-designed for portable battery-powered instrumentation requiring stable low-voltage rail generation.

For engineers reviewing the NCP693DMN12TCG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1 A (0.500–1.100 V), thermal shutdown at 165°C, PSRR of 70 dB at 1 kHz, and compatibility with ceramic or tantalum output capacitors ≥2.2 µF.

Technical Context

The NCP693DMN12TCG integrates a PMOS pass transistor, precision voltage reference, error amplifier, and current-limit/thermal-shutdown protection. Its D-version variant includes dedicated auto-discharge circuitry activated during CE-driven standby, enabling rapid output discharge to prevent residual voltage hold-up in power sequencing-critical systems.

It operates across −40°C to +85°C ambient, supports input voltages from 1.6 V to 6.5 V, and maintains regulation down to 1.2 V output with dropout as low as 0.300 V at 300 mA and 0.500 V at 1 A (TA = 25°C), making it suitable for single-cell Li-ion or multi-cell alkaline/battery-derived supplies.

Key Specifications

Pinout & Package

Package: UDFN-6 (1.8 mm × 2.0 mm, 0.5 mm pitch), exposed thermal pad (EP = GND), RoHS-compliant Pb-free construction per Case 517BA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1826T-1202E/DB and TLS850F0TES/V33, the NCP693DMN12TCG uniquely combines 1 A capability, auto-discharge, and sub-100 µA quiescent current in a 1.8×2 mm DFN-making it optimal for space-constrained, battery-sensitive portable instruments where precise power sequencing matters.

Availability

NCP693DMN12TCG is available at Aetrix Electronics and suitable for hand-held test instruments, battery-powered data loggers, and portable medical monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP693DMN12TCG 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 NCP693 series belongs to onsemi's precision analog LDO portfolio, engineered specifically for portable battery-powered equipment demanding high accuracy, ultra-low quiescent current, and fast enable/disable control with integrated discharge functionality.

FAQ

What is the maximum input voltage rating for the NCP693DMN12TCG?

The NCP693DMN12TCG has an absolute maximum input voltage rating of 7 V, but its recommended operating input range is 1.6 V to 6.5 V. Exceeding 6.5 V may degrade long-term reliability even if within absolute max limits. The device is optimized for single-cell Li-ion (up to 4.2 V) or dual-alkaline (up to 3.2 V) sources, and the 6.5 V upper bound accommodates transient spikes in regulated supply rails feeding the NCP693DMN12TCG.

Does the NCP693DMN12TCG require an external capacitor on the CE pin for stable enable operation?

No, the NCP693DMN12TCG does not require an external capacitor on the CE pin. Its enable input has defined threshold voltages (1.0 V turn-on, 0.4 V turn-off) and internal hysteresis; standard logic-level signals from MCUs or GPIOs drive it directly. However, if the CE signal originates from a noisy environment, a small RC filter (e.g., 10 kΩ + 100 pF) may be added to suppress glitches-though this is not specified in the NCP693DMN12TCG datasheet and must be validated per application.

How does the auto-discharge feature of the NCP693DMN12TCG operate during shutdown?

When the CE pin is pulled low, the NCP693DMN12TCG disables regulation and activates an internal NMOS transistor between Vout and GND. This provides a controlled discharge path with typical R_DS(on) of 30 Ω, bringing Vout to near-zero within microseconds-preventing residual voltage from interfering with downstream logic states or causing latch-up in interconnected ICs. This behavior is exclusive to D-version devices like the NCP693DMN12TCG and is absent in H-version variants.

Can the NCP693DMN12TCG be used with a 1 µF ceramic output capacitor?

No-the NCP693DMN12TCG requires a minimum output capacitance of 2.2 µF, as specified in the datasheet. Using only 1 µF risks instability, excessive output ripple, or oscillation due to insufficient phase margin. The device is optimized for 2.2 µF ceramic or tantalum capacitors; lower values violate the stability criteria validated in the typical application circuit (Figure 2) and may cause erratic regulation or thermal shutdown under load transients.

What is the thermal resistance (R_JA) of the NCP693DMN12TCG under standard PCB conditions?

The NCP693DMN12TCG has a junction-to-ambient thermal resistance (R_JA) of 114°C/W when mounted on an 80 mm × 80 mm × 1.5 mm FR4 PCB with 1 oz copper and the specified 100 mm² copper pour area connected to the exposed pad. This value assumes proper soldering of the EP pad to maximize heat conduction; reducing copper area or omitting EP connection increases R_JA significantly and may trigger thermal shutdown at lower power dissipation levels.