onsemi NCP177BMX100TCG

Overview

NCP177BMX100TCG from onsemi is a CMOS low-dropout linear voltage regulator delivering 500 mA output current with fixed 1.00 V output, 1.6 V to 5.5 V input range, 200 mV typical dropout at 500 mA (for 1.8 V variant; 295 mV for 1.0 V), ±0.8% output accuracy, and stable operation with 1 µF ceramic output capacitors. It powers noise-sensitive analog and digital circuitry in battery-powered portable equipment.

For engineers reviewing the NCP177BMX100TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.00 V fixed output, absence of output discharge (NCP177B variant), XDFN4 1 mm × 1 mm package, thermal shutdown at 175°C, and 60 µA quiescent current under no-load conditions.

Technical Context

The NCP177BMX100TCG employs a PMOS pass transistor architecture enabling ultra-low dropout and reverse-current protection via inherent body diode management. Its adaptive ground current design maintains 60 µA quiescent current at zero load while scaling with output current.

Internal circuitry integrates soft-start, precision 0.7 V reference, over-current protection with 750 mA typical current limit, and thermal shutdown with 20°C hysteresis. The EN pin (active-high, 1.0 V threshold) controls regulation but does not activate output discharge - a defining distinction from the NCP177A series.

Key Specifications

Pinout & Package

Package: XDFN4 (Case 711AJ), 1.0 mm × 1.0 mm × 0.4 mm, with exposed thermal pad (EPAD) requiring connection to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1826T-1002E/DB and XC6210B102MR-G, the NCP177BMX100TCG offers superior thermal protection (175°C shutdown + 20°C hysteresis), lower dropout at 1.0 V output (295 mV vs. 220–250 mV), and guaranteed over-current limiting - making it more robust for unattended industrial or medical deployments.

Availability

NCP177BMX100TCG is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld scanners, and smart camera modules requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP177BMX100TCG 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 manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP177 series belongs to onsemi's high-performance LDO portfolio designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, fast transient response, and small-footprint packaging.

FAQ

What is the output voltage tolerance of the NCP177BMX100TCG over temperature?

The NCP177BMX100TCG delivers 1.00 V output with ±0.8% tolerance over the full operating junction temperature range of −40°C to +85°C, as specified in the Electrical Characteristics table. This accuracy is maintained without external trimming or feedback components, ensuring consistent performance in varying environmental conditions across all units of the NCP177BMX100TCG.

Does the NCP177BMX100TCG include output discharge functionality?

No, the NCP177BMX100TCG does not include output discharge functionality. The "B" suffix explicitly denotes the absence of the active discharge transistor present in the NCP177A variants. When disabled via the EN pin, the NCP177BMX100TCG leaves the output floating, preserving charge on downstream capacitors - a key differentiator for power sequencing or hold-up requirements in the NCP177BMX100TCG design.

What is the minimum input voltage required for the NCP177BMX100TCG to regulate at full 500 mA load?

The NCP177BMX100TCG requires a minimum input voltage of V_OUT + V_DO = 1.00 V + 295 mV = 1.295 V (typical) to sustain 500 mA output current. Per the datasheet, dropout is 295 mV typical at 500 mA for V_OUT < 1.8 V. Therefore, with 1.00 V nominal output, the NCP177BMX100TCG can regulate down to ~1.3 V input, enabling use with deeply discharged single-cell batteries.

Can the NCP177BMX100TCG be used with ceramic output capacitors smaller than 1 µF?

The NCP177BMX100TCG is characterized for stability with ≥1 µF ceramic output capacitors (X7R/X5R). While the datasheet states it remains stable down to 0.8 µF effective capacitance, using smaller values risks degraded load transient response and potential instability due to reduced phase margin - especially under DC bias and temperature variation. For reliable operation, the NCP177BMX100TCG should be paired with a minimum 1 µF X7R 0402 or 0201 ceramic capacitor placed directly at the OUT and GND pins.

What thermal derating applies to the NCP177BMX100TCG in a standard 1 oz copper PCB layout?

With the XDFN4 package mounted on a standard 1 oz copper PCB (no thermal vias), the NCP177BMX100TCG exhibits θ_JA = 223°C/W. At 25°C ambient, maximum continuous power dissipation before reaching 125°C junction limit is PD_MAX = (125 − 25)/223 ≈ 0.448 W. For a 1.00 V output and 500 mA load, power dissipation is (V_IN − 1.00 V) × 0.5 A + (60 µA × V_IN). Thus, input voltage must remain ≤ ~2.8 V to avoid thermal shutdown - confirming the NCP177BMX100TCG's suitability for low-V_IN battery applications.