onsemi NCP177BMX120TCG

Overview

NCP177BMX120TCG from onsemi is a CMOS low-dropout linear voltage regulator delivering 500 mA output current with fixed 1.20 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 accuracy, 60 µA quiescent current, thermal shutdown at 175°C, and operates in battery-powered portable equipment requiring stable low-noise bias.

For engineers reviewing the NCP177BMX120TCG datasheet, pinout, applications, or equivalent options, key selection considerations include its XDFN4 1 mm × 1 mm package, absence of output discharge (B-version), fast transient response, compatibility with 1 µF ceramic output capacitors, and suitability for noise-sensitive analog/RF subsystems in space-constrained designs.

Technical Context

The NCP177BMX120TCG employs a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its adaptive ground current design maintains 60 µA quiescent current at no load while scaling with output current, supporting ultra-low-power standby modes.

Internal circuitry includes precision bandgap reference, soft-start control, overcurrent protection, and thermal shutdown with 20°C hysteresis. Unlike the A-version, the B-version omits active output discharge, eliminating the 60 Ω discharge path during disable-critical for systems where uncontrolled V_OUT decay could disrupt downstream logic states.

Key Specifications

Pinout & Package

Package: XDFN4 (Case 711AJ), 1.0 mm × 1.0 mm × 0.4 mm body 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 XC6210B122MR-G and RT9013-12GB, the NCP177BMX120TCG delivers best-in-class PSRR (75 dB) and thermal resistance (223°C/W) in its 1 mm² XDFN4 package, making it optimal for noise-critical, space-constrained applications where output discharge is not needed.

Availability

NCP177BMX120TCG is available at Aetrix Electronics and suitable for mobile camera modules, wearable health sensors, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP177BMX120TCG 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 NCP177 series targets portable and battery-operated systems demanding ultra-low IQ, small form factor, and high dynamic performance-designed specifically for powering noise-sensitive analog/RF blocks in space-constrained devices.

FAQ

What is the output voltage tolerance of the NCP177BMX120TCG over temperature?

The NCP177BMX120TCG guarantees ±0.8% output voltage accuracy at T_J = +25°C and ±1.0% over the full operating junction temperature range of −40°C to +85°C. This tight tolerance ensures reliable operation of 1.2 V core logic without external trimming or calibration, even under thermal cycling in handheld devices.

Does the NCP177BMX120TCG require an external output capacitor, and what type is recommended?

Yes, the NCP177BMX120TCG requires a minimum 1 µF ceramic output capacitor (X7R or X5R dielectric) placed adjacent to the OUT and GND pins. The device is stable with effective capacitance as low as 0.8 µF, but 1 µF ensures optimal load transient response and PSRR across temperature and DC bias variations.

How does the enable function operate on the NCP177BMX120TCG?

The EN pin of the NCP177BMX120TCG is active-high: applying >1.0 V enables regulation, while <0.4 V disables output and reduces supply current to 0.1–1 µA. An internal 300 nA pull-down ensures safe default-off behavior when EN is floating, eliminating need for external pull-down resistors in most designs.

What thermal derating applies to the NCP177BMX120TCG at 500 mA load?

At 500 mA output and ambient temperature of 25°C, the NCP177BMX120TCG dissipates up to ~0.5 W (P_D ≈ (V_IN − 1.2 V) × 0.5 A + I_GND × V_IN). With R_JA = 223°C/W and max T_J = 150°C, maximum allowable ambient temperature drops to ~125°C - underscoring necessity of EPAD-to-ground thermal vias and ≥1 cm² copper pour for sustained full-load operation.

Is the NCP177BMX120TCG compatible with 1.6 V minimum input voltage in all operating conditions?

Yes, the NCP177BMX120TCG supports input voltages as low as 1.6 V across its full −40°C to +85°C operating range. At 1.6 V input and 1.2 V output, the headroom is 400 mV - sufficient to maintain regulation even with worst-case 200 mV dropout and line/load transients, enabling use with single-cell LiFePO₄ or deeply discharged Li-ion batteries.