onsemi NCP133AMX180TCG

Overview

NCP133AMX180TCG from onsemi is a 500 mA very low dropout (VLDO) CMOS voltage regulator with NMOS pass transistor and separate VBIAS rail, delivering a fixed 1.80 V output with ±1.5% accuracy over temperature. It features ultra-low 140 mV dropout at 500 mA load, 80 µA typical bias current, and integrated active output discharge - optimized for noise-sensitive, space-constrained portable power rails such as smartphone core logic or camera sensor I/O supplies.

For engineers reviewing the NCP133AMX180TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-rail architecture (VIN + VBIAS), guaranteed stability with 2.2 µF ceramic output capacitance, thermal shutdown at 160°C, and XDFN6 1.2 mm × 1.2 mm package compatibility with high-density PCB layouts.

Technical Context

The NCP133AMX180TCG employs an NMOS pass transistor architecture powered by a dedicated VBIAS supply (2.4–5.5 V), decoupling control circuitry from input rail noise and enabling stable regulation even when VIN approaches VOUT. Its internal voltage reference maintains 0.5% initial accuracy at 25°C and ±1.5% over −40°C to +85°C.

It integrates logic-level enable (VEN(H) = 0.9 V), under-voltage lockout on VBIAS (1.6 V threshold with 0.2 V hysteresis), and active output discharge activated during disable mode - a feature confirmed exclusive to the "AMX" series variants including NCP133AMX180TCG per Figure 2 and ordering table.

Key Specifications

Pinout & Package

XDFN6 package (Case 711AT), 1.2 mm × 1.2 mm × 0.4 mm, thermally enhanced with exposed pad soldered to ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, dual-rail LDO applications.

Compared with TPS7A2018PDBVR and NCP114AMX180TCG, the NCP133AMX180TCG uniquely delivers 500 mA output with dual-rail noise isolation and guaranteed active discharge - making it the only option among the three qualified for high-fidelity portable power domains requiring both current headroom and controlled power-down behavior.

Availability

NCP133AMX180TCG is available at Aetrix Electronics and suitable for smartphone power management, camera module regulation, and STB audio codec supply requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP133AMX180TCG 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, and consumer markets.

The NCP133AMX180TCG belongs to onsemi's NCP133 family of dual-rail VLDO regulators, engineered specifically for noise-sensitive, space-constrained portable electronics requiring precision low-voltage rails with robust power sequencing.

FAQ

What is the maximum input voltage for the NCP133AMX180TCG?

The NCP133AMX180TCG supports an absolute maximum input voltage (VIN) of 6 V, with recommended operating range up to 5.5 V. Exceeding 6 V risks permanent device damage per Absolute Maximum Ratings. For reliable operation, VIN should remain within 0.8 V to 5.5 V, and maintain at least 140 mV above 1.80 V output under full 500 mA load to ensure regulation.

Does the NCP133AMX180TCG require an external resistor divider for output voltage setting?

No, the NCP133AMX180TCG is a fixed-output variant delivering 1.80 V without external feedback components. Pin 2 is a true no-connect (NC), confirming it lacks ADJ functionality. Only adjustable versions like NCP133AMXADJTCG require R1/R2 resistors - the NCP133AMX180TCG achieves its 1.80 V output via internal trimming, verified to ±1.5% over temperature.

Is active output discharge enabled by default on the NCP133AMX180TCG?

Yes, active output discharge is a built-in feature of all NCP133AMXxxxTCG devices, including the NCP133AMX180TCG. When the EN pin is driven low (≤0.4 V), an internal FET pulls the OUT pin to GND, discharging external capacitors. This behavior is confirmed in Figure 2 and the ordering table footnote specifying "Output Active Discharge" for the AMX series.

What is the minimum required VBIAS voltage for the NCP133AMX180TCG to operate correctly?

The NCP133AMX180TCG requires VBIAS ≥ 2.4 V to operate, with a typical minimum of (VOUT + 1.40 V) = 3.20 V for optimal performance. The device incorporates under-voltage lockout (UVLO) on VBIAS with 1.6 V threshold and 0.2 V hysteresis - if VBIAS drops below ~1.4 V, regulation ceases and the part enters shutdown. Stable operation demands VBIAS between 2.4 V and 5.5 V.

Can the NCP133AMX180TCG be used with a 1 µF input capacitor and 2.2 µF output capacitor?

Yes, the NCP133AMX180TCG is characterized and guaranteed stable with CIN = 1 µF and COUT = 2.2 µF ceramic capacitors, as specified in the Electrical Characteristics test conditions and Applications Information section. These values meet the device's stability requirements across temperature and load, eliminating need for larger or specialized capacitor types.