onsemi NCV8705MW28TCG

Overview

NCV8705MW28TCG from onsemi is an automotive-grade ultra-low-noise, ultra-low-quiescent-current LDO regulator delivering 500 mA output with 2.8 V fixed output voltage, 230 mV typical dropout at full load, ±2% output accuracy over load/line/temperature, and 12 µV_RMS integrated noise (100 Hz–100 kHz). It powers noise-sensitive RF receivers, imaging sensors, and audio processors in ADAS and infotainment systems.

For engineers reviewing the NCV8705MW28TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, wettable flank WDFN6 package, adaptive ground current circuit enabling 13 µA IQ at no load, active output discharge, and stability with only 1 µF ceramic output capacitor.

Technical Context

The NCV8705MW28TCG implements a PMOS pass transistor architecture with integrated bandgap reference, adaptive low-power mode, and internal soft-start to limit inrush current. Its EN pin features 0.9 V turn-on threshold and 0.4 V shutdown threshold with 2 mV hysteresis to prevent noise-induced oscillation.

It integrates thermal shutdown (160 °C trip, 20 °C hysteresis), current limiting (510–950 mA), undervoltage lockout (1.2–1.9 V), and active output discharge-enabling fast, controlled turn-off without external components. The device operates across 2.5 V to 5.5 V input and maintains regulation down to 230 mV dropout at 500 mA.

Key Specifications

Pinout & Package

NCV8705MW28TCG uses the WDFN6 2×2 mm wettable flank package (Case 511BR), optimized for automated optical inspection (AOI) and high-reliability automotive solder joints. Exposed thermal pad must be soldered to PCB ground plane for thermal dissipation (θ_JB = 30 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73328PDBVR and NCP114AMX28T2G, the NCV8705MW28TCG uniquely combines AEC-Q100 qualification, 500 mA output, 13 µA IQ, active discharge, and wettable flank packaging-making it the only option meeting full OEM requirements for next-generation ADAS power domains.

Availability

NCV8705MW28TCG is available at Aetrix Electronics and suitable for ADAS camera modules, automotive infotainment systems, and telematics units requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.

Supply support for NCV8705MW28TCG 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCV8705MW28TCG belongs to onsemi's automotive-qualified LDO portfolio, engineered specifically for noise-sensitive power domains in ADAS, infotainment, and body electronics where ultra-low IQ, low noise, and AEC-Q100 reliability are mandatory.

FAQ

What is the output voltage tolerance of the NCV8705MW28TCG over temperature and load?

The NCV8705MW28TCG maintains ±2% output voltage accuracy across −40 °C to +125 °C junction temperature, full 0–500 mA load range, and input voltage from V_OUT + 0.5 V to 5.5 V. This is confirmed in Table 4 of the datasheet under "Output Voltage Accuracy" with test conditions explicitly covering all three variables. The NCV8705MW28TCG achieves this via precision bandgap reference and low-drift error amplifier design.

Does the NCV8705MW28TCG require an external noise-bypass capacitor?

No, the NCV8705MW28TCG does not require an external noise-bypass capacitor. Its integrated 12 µV_RMS output noise (100 Hz–100 kHz) is achieved through internal filtering and architecture optimization, as stated in the Features section and verified in Figure 3–6 of the datasheet. This eliminates BOM cost and layout area typically needed for bypass caps in RF and imaging applications.

What is the purpose of the N/C pins on the NCV8705MW28TCG WDFN6 package?

The N/C pins (pins 2 and 5) on the NCV8705MW28TCG WDFN6 package are internally unconnected. Per Table 1 of the datasheet, they may be tied to GND solely to enhance thermal conduction from the die to the PCB ground plane-improving θ_JA and θ_JB-without any electrical function or risk of shorting.

How does the adaptive ground current feature work in the NCV8705MW28TCG?

The NCV8705MW28TCG uses an Adaptive Ground Current circuit that dynamically scales bias currents in the internal error amplifier and pass element driver based on output load. At 0 mA load, ground current drops to 13 µA typ.; at 500 mA, it rises to 260 µA typ. This is detailed in Figure 9–12 and the Applications Information section, enabling ultra-low standby power without sacrificing transient response.

Is the NCV8705MW28TCG pin-compatible with other variants in the NCV8705 family?

Yes-the NCV8705MW28TCG shares identical WDFN6 2×2 mm pinout (IN, EN, GND, OUT, N/C, N/C) with all fixed-output variants in the NCV8705 family, including NCV8705MW18TCG and NCV8705MW33TCG. Pin functions and placement are standardized per Table 1 and the Package Diagram on page 20 of the datasheet, enabling drop-in replacement across output voltages.