onsemi NCP177AMX150TCG

Overview

NCP177AMX150TCG from onsemi is a CMOS low-dropout (LDO) linear voltage regulator delivering 500 mA output current with fixed 1.50 V output, 1.6 V to 5.5 V input range, and 200 mV typical dropout at 500 mA (V_OUT = 1.8 V). It features ±0.8% output voltage accuracy, 60 µA quiescent current, and integrated enable control - designed for powering noise-sensitive analog and digital circuitry in space-constrained portable systems.

For engineers reviewing the NCP177AMX150TCG datasheet, pinout, applications, or equivalent options, key selection criteria include fast transient response, stable operation with 1 µF ceramic output capacitors, thermal shutdown at 175°C, output discharge functionality (NCP177A variant), and XDFN4 1 mm × 1 mm package compatibility with high-density PCB layouts.

Technical Context

The NCP177AMX150TCG implements a PMOS pass transistor architecture enabling ultra-low dropout and reverse-current protection via its intrinsic body diode. Its adaptive ground current design maintains 60 µA quiescent current at no load while scaling efficiently under load.

Internal circuitry includes a precision 0.7 V reference, soft-start logic, over-current protection, and thermal shutdown with 20°C hysteresis. The EN pin (active-high, 1.0 V threshold) controls both regulation and - in the 'A' variant - active output discharge through a 60 Ω internal FET.

Key Specifications

Pinout & Package

Supplied in XDFN4 (Case 711AJ), 1.0 mm × 1.0 mm × 0.4 mm, leadless package with exposed thermal pad (EPAD) requiring connection to PCB ground plane for optimal thermal performance and power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1502E/MB and TPL7407LPWPR, the NCP177AMX150TCG uniquely balances 500 mA delivery, 60 µA IQ, EN-controlled output discharge, and XDFN4 size - making it optimal for compact, battery-powered systems demanding both efficiency and precise power sequencing.

Availability

NCP177AMX150TCG is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and smartphone camera modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP177AMX150TCG 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 silicon solutions for automotive, industrial, cloud, and medical applications.

The NCP177AMX150TCG belongs to onsemi's high-performance LDO family engineered for ultra-low-noise, fast-transient, and space-constrained battery-powered systems - emphasizing precision regulation, minimal IQ, and robust fault protection.

FAQ

What is the output voltage tolerance of the NCP177AMX150TCG over temperature?

The NCP177AMX150TCG guarantees ±0.8% output voltage accuracy at +25°C and ±1.0% over the full −40°C to +85°C operating junction temperature range. This specification is confirmed in the Electrical Characteristics table under "Output Voltage" test conditions for V_{OUT_NOM} ≥ 1.8 V, with linear interpolation applicable for the 1.50 V variant based on onsemi's characterization data and typical curve behavior shown in Figure 3.

Does the NCP177AMX150TCG require an external resistor to set output voltage?

No, the NCP177AMX150TCG is a fixed-output LDO with factory-trimmed 1.50 V regulation. It does not use external feedback resistors. The "MX150" suffix in the part number explicitly denotes the 1.50 V option, and the internal voltage reference and error amplifier are configured for this nominal output - eliminating layout complexity and resistor tolerance errors.

Can the NCP177AMX150TCG operate with input voltage below 1.6 V?

No - the absolute minimum input voltage for functional regulation is 1.6 V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 1.6 V may result in dropout, unregulated output, or undefined behavior. For sub-1.6 V inputs, a different regulator architecture (e.g., charge pump or buck-boost) is required.

Is the exposed pad (EPAD) of the NCP177AMX150TCG electrically connected internally?

Yes, the EPAD of the NCP177AMX150TCG is internally connected to the GND terminal. Per the Pin Function Description and Mechanical Case Outline, it must be soldered to a PCB ground plane to ensure proper thermal dissipation and electrical stability - failure to do so degrades θ_JA performance and risks thermal shutdown under load.

How does the output discharge function behave during disable in the NCP177AMX150TCG?

When the EN pin is pulled low (<0.4 V), the NCP177AMX150TCG disables regulation and activates an internal 60 Ω NMOS discharge path between OUT and GND. This pulls the output voltage to near ground within milliseconds (per Figure 25), preventing residual charge from interfering with downstream logic states or causing unintended wake-up - a key feature distinguishing the 'A' variant from 'B'.