onsemi NCP552SQ27T1

Overview

NCP552SQ27T1 from onsemi is a fixed-output 2.7 V, 80 mA CMOS low-I_Q NOCAP linear regulator with enable control, designed for battery-powered portable electronics requiring ultra-low quiescent current (2.8 µA typical), ±2.0% output voltage accuracy, and operation without an output capacitor. It serves as a primary power rail for microcontrollers, sensors, and RF modules in space-constrained handheld devices.

For engineers reviewing the NCP552SQ27T1 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (750 mV max at 80 mA), SC82-AB (SC70-4) package footprint, enable threshold compatibility (1.3 V logic high), and thermal performance up to +85°C ambient.

Technical Context

The NCP552SQ27T1 integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuitry (current limit and thermal shutdown) in a single die. Its NOCAP architecture eliminates mandatory output capacitance, enabling stable regulation with only a 1.0 µF input ceramic capacitor.

It features active enable control with defined logic thresholds (1.3 V turn-on, 0.3 V turn-off), operates across 2.7 V to 12 V input range, and maintains regulation down to −40°C ambient while delivering 2.7 V ±2.0% over temperature and load (10 mA to 80 mA).

Key Specifications

Pinout & Package

The NCP552SQ27T1 is housed in the SC82-AB (SC70-4) surface-mount package - a 4-pin, 1.8 mm × 1.15 mm micro-miniature outline with gull-wing leads and 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2702E/TT and XC6206P272MR-G, the NCP552SQ27T1 uniquely combines enable control, thermal/current protection, and NOCAP operation in the SC70-4 package - making it optimal for compact, safety-aware, battery-gated systems.

Availability

NCP552SQ27T1 is available at Aetrix Electronics and suitable for wearable health sensors, Bluetooth Low Energy modules, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP552SQ27T1 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 electronics, with leadership in power management, analog, and sensing technologies.

The NCP552SQ27T1 belongs to onsemi's NOCAP LDO family, engineered specifically for ultra-low-power portable and battery-operated applications where board space, quiescent current, and capacitor-free operation are critical design constraints.

FAQ

What is the maximum input voltage for the NCP552SQ27T1?

The NCP552SQ27T1 supports a maximum input voltage of 12 V, as specified in its Absolute Maximum Ratings table. This allows direct use with common input sources such as 9 V batteries, USB-powered systems (with appropriate pre-regulation), or multi-cell alkaline packs. Operation above 12 V risks permanent device damage and voids functional guarantees.

Does the NCP552SQ27T1 require an output capacitor to operate?

No, the NCP552SQ27T1 is a NOCAP regulator and is fully stable without any output capacitor. It can operate reliably with only the recommended 1.0 µF input ceramic capacitor. An output capacitor may be added to improve transient response or reduce noise, but it is not required for stability - a key advantage for space-constrained designs.

What is the dropout voltage of the NCP552SQ27T1 at 80 mA load?

The dropout voltage of the NCP552SQ27T1 is 750 mV maximum at 80 mA output current and −40°C to +125°C junction temperature, measured when V_OUT drops 3.0% below nominal. At room temperature and 10 mA load, typical dropout is lower - enabling extended runtime from partially discharged batteries.

Can the enable pin of the NCP552SQ27T1 be left floating?

No, the enable pin of the NCP552SQ27T1 must not be left floating. If unused, it must be tied directly to V_IN to ensure the device remains enabled. Floating the enable pin risks unpredictable behavior due to noise coupling or internal leakage, potentially causing intermittent shutdown or erratic output regulation in the NCP552SQ27T1.

Is the NCP552SQ27T1 compatible with lead-free soldering processes?

Yes, the NCP552SQ27T1 is manufactured in Pb-free (RoHS-compliant) packaging and qualified for standard lead-free reflow profiles per J-STD-020. The SC82-AB package uses matte tin plating and is rated for peak reflow temperatures up to 260°C. Full process guidelines are documented in onsemi's Soldering and Mounting Techniques Reference Manual.