onsemi NCP120BMX080TCG

Overview

NCP120BMX080TCG from onsemi is a 150 mA very low dropout (VLDO) CMOS voltage regulator with NMOS pass transistor and separate bias rail (VBIAS), delivering 0.80 V fixed output at ±1.5% accuracy over −40°C to +85°C, 75 mV max dropout at 150 mA, and ultra-low 80 µA typical bias current - designed for noise-sensitive, space-constrained portable power rails such as smartphone core I/O or camera sensor bias supplies.

For engineers reviewing the NCP120BMX080TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-rail architecture (VIN/VBIAS), absence of active output discharge (distinguishing it from NCP120A variants), XDFN6 1.2 mm × 1.2 mm package constraints, and guaranteed stability with 1 µF ceramic output capacitance.

Technical Context

The NCP120BMX080TCG implements a dual-input NMOS-based LDO architecture: VIN supplies the pass element while VBIAS powers internal control circuitry, enabling ultra-low dropout and reduced sensitivity to output capacitor ESR. Its UVLO monitors VBIAS with 1.6 V threshold and 0.2 V hysteresis, ensuring reliable startup under varying bias conditions.

Unlike PMOS LDOs, this topology decouples loop stability from output capacitance value, allowing stable operation with only 1 µF effective ceramic capacitance. The device lacks active discharge (per ordering code "B"), distinguishing its shutdown behavior from NCP120A-series parts - output floats rather than actively pulled down when disabled.

Key Specifications

Pinout & Package

XDFN6 package (Case 711AT), 1.2 mm × 1.2 mm × 0.4 mm, thermal pad soldered to ground plane for 170°C/W junction-to-air thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout voltage regulator applications.

Compared with NCP120AMX080TCG, NCP120BMX080TCG offers simpler shutdown behavior and identical regulation performance but lacks active discharge; versus TPL7407LPGEDR, it delivers lower dropout, higher PSRR, and true dual-rail isolation - making it preferable for noise-critical, single-rail applications where board space and thermal management are constrained.

Availability

NCP120BMX080TCG is available at Aetrix Electronics and suitable for mobile processor I/O rails, image sensor bias supplies, wearable MCU cores, and USB-C PD interface logic requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for NCP120BMX080TCG 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP120 series is part of onsemi's precision analog portfolio, engineered specifically for ultra-low-voltage, low-noise, space-constrained power management in portable electronics - emphasizing dropout minimization, bias efficiency, and ceramic capacitor compatibility.

FAQ

What is the key functional difference between NCP120BMX080TCG and NCP120AMX080TCG?

The NCP120BMX080TCG lacks active output discharge during disable mode, whereas the NCP120AMX080TCG includes an internal 150 Ω pull-down on the OUT pin when EN is low. This means NCP120BMX080TCG leaves the output floating upon shutdown - critical for systems where uncontrolled discharge could disrupt downstream timing or cause latch-up. All other electrical specifications, including 0.80 V output, 75 mV dropout, and 80 µA bias current, are identical between the two variants.

Can NCP120BMX080TCG operate with VIN equal to VOUT (i.e., 0.80 V input)?

No - the NCP120BMX080TCG requires minimum headroom: VIN must be at least VOUT + VDO, where VDO is up to 75 mV at 150 mA. Therefore, minimum valid VIN is 0.875 V. Attempting to operate at exactly 0.80 V will result in dropout and loss of regulation. The datasheet specifies operating input voltage range as VOUT + VDO to 5.5 V, confirming this constraint.

Is a separate VBIAS supply mandatory for NCP120BMX080TCG operation?

Yes - VBIAS is required to power internal control circuitry and must be within 2.4 V to 5.5 V. It cannot be tied to VIN unless VIN meets that range. If VIN is 0.875 V (minimum), VBIAS must be supplied separately (e.g., from a 3.3 V rail). The UVLO circuit monitors VBIAS and disables regulation if it falls below 1.6 V, making reliable VBIAS sourcing essential for robust startup and operation.

What is the maximum output capacitance supported by NCP120BMX080TCG?

The NCP120BMX080TCG is stable with output capacitance from 1 µF to 10 µF effective value - including effects of DC bias, temperature, and tolerance. Larger values (e.g., 22 µF) are not prohibited but offer no stability benefit and may increase start-up time or inrush current. The 1 µF minimum is strictly enforced; using less risks oscillation or poor transient response.

Does NCP120BMX080TCG require input or bias capacitors, and what values are recommended?

Yes - the datasheet specifies CIN = 1 µF and CBIAS = 0.1 µF (or greater) ceramic capacitors, placed directly at the IN and BIAS pins respectively. These minimize impedance from PCB traces and prevent instability due to parasitic inductance. Skipping either capacitor - especially CBIAS - risks UVLO false triggering or erratic enable behavior under dynamic load conditions.