onsemi NCV8133BMX110TCG

Overview

NCV8133BMX110TCG from onsemi is a 500 mA very low dropout (VLDO) CMOS voltage regulator with NMOS pass transistor and separate VBIAS supply, delivering fixed 1.10 V output at ±1.5% accuracy over −40°C to +125°C. It achieves ultra-low 140 mV dropout at 500 mA, draws only 80 µA bias current, and supports stable operation with 2.2 µF ceramic output capacitance - ideal for automotive point-of-load regulation in FPGA/DSP power domains.

For engineers reviewing the NCV8133BMX110TCG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal performance data, EN-controlled ON/OFF functionality, AEC-Q100 Grade 1 qualification, and real-world design constraints including VBIAS ≥ 2.4 V and VIN ≥ (VOUT + VDO) minimums.

Technical Context

The NCV8133BMX110TCG uses a dual-rail architecture: VIN supplies the NMOS pass element while VBIAS powers internal control circuitry, enabling independent optimization of dropout and quiescent current. Its under-voltage lockout (UVLO) on VBIAS ensures reliable startup only when bias voltage exceeds 2.4 V with 0.2 V hysteresis.

It features logic-level enable (VEN(H) = 0.9 V), active discharge disabled (per marking "B"), thermal shutdown at 160°C, and PSRR of 70 dB (VIN-to-VOUT) and 80 dB (VBIAS-to-VOUT) at 1 kHz - critical for noise-sensitive analog and digital loads requiring clean 1.10 V rails.

Key Specifications

Pinout & Package

XDFN6 1.2 mm × 1.2 mm package (Case 711AT) with exposed 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 linear regulator applications.

Compared with NCV8133AMX110TCG, the NCV8133BMX110TCG omits active discharge to reduce complexity and cost where sequencing isn't critical; versus TLD1113-11ES, it delivers 67% higher current and 30% lower dropout while adding VBIAS isolation for superior noise immunity in mixed-signal systems.

Availability

NCV8133BMX110TCG is available at Aetrix Electronics and suitable for automotive ADAS, industrial PLC, and infotainment system designs requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for NCV8133BMX110TCG 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCV8133BMX110TCG belongs to onsemi's automotive-grade VLDO regulator family, engineered specifically for noise-sensitive, space-constrained point-of-load applications in vehicles requiring Grade 1 temperature operation and PPAP documentation.

FAQ

What is the minimum input voltage required for NCV8133BMX110TCG to regulate 1.10 V at 500 mA?

The NCV8133BMX110TCG requires VIN ≥ (VOUT + VDO) = 1.10 V + 0.14 V = 1.24 V minimum at 500 mA per datasheet Figure 6. This ultra-low dropout enables operation from partially discharged batteries or post-buck converter rails with minimal headroom. The device will not regulate if VIN falls below this threshold, even with adequate VBIAS.

Does NCV8133BMX110TCG require an external resistor divider for output voltage setting?

No, the NCV8133BMX110TCG is a fixed-output regulator with internally trimmed 1.10 V reference - no external resistors are needed or supported. The "MX110" suffix explicitly denotes the 1.10 V variant; output voltage cannot be adjusted. This simplifies layout and eliminates resistor tolerance errors affecting accuracy.

Can NCV8133BMX110TCG operate with VBIAS and VIN tied together?

Yes, but with limitations: tying VBIAS to VIN forces the device into single-rail mode, increasing VBIAS dropout voltage to 1.1–1.5 V (per datasheet Table 4). For 1.10 V output, this requires VIN ≥ 2.2 V - negating the ultra-low dropout advantage. Use separate VBIAS (e.g., 3.3 V) to maintain 140 mV dropout and minimize power loss.

Is active output discharge enabled on NCV8133BMX110TCG?

No, the "B" in NCV8133BMX110TCG indicates non-active discharge configuration. When disabled, the output floats rather than being pulled to ground. This is confirmed in the datasheet footnote stating active discharge is present only in "A" variants (e.g., NCV8133AMXyyyTCG). No external discharge circuitry is integrated.

What is the recommended PCB layout practice for thermal management of NCV8133BMX110TCG?

The NCV8133BMX110TCG's exposed thermal pad must be soldered directly to a solid copper ground plane using ≥4 thermal vias (0.3 mm diameter) spaced evenly beneath the pad. Per datasheet Section 10, this achieves the rated 170°C/W R_JA; omitting vias or using thin traces increases junction temperature, risking thermal shutdown at >400 mW dissipation.