onsemi NCV59745AMW1015TAG

Overview

NCV59745AMW1015TAG from onsemi is a fixed-output, dual-rail linear voltage regulator delivering up to 3.0 A output current with 105 mV typical dropout at full load, 0.25% typical accuracy over line and load, 6 µV_RMS output noise (10 Hz–100 kHz), and programmable soft-start via external capacitor. It powers noise-sensitive high-speed digital loads including automotive FPGAs and imaging ASICs.

For engineers reviewing the NCV59745AMW1015TAG datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.015 V fixed output, QFNW20 wettable flank package, active discharge capability (NCV59745A variant), ±0.3% output accuracy, and 75 dB PSRR at 1 kHz - all critical for automotive point-of-load regulation.

Technical Context

The NCV59745AMW1015TAG uses an NMOS pass transistor architecture, enabling ultra-low dropout and reduced sensitivity to output capacitor ESR compared to PMOS LDOs. Its dual-rail design separates VIN (0.8–5.5 V) and VBIAS (2.2–5.5 V) supplies, decoupling power delivery from control circuitry.

It integrates undervoltage lockout (1.2–2.0 V hysteresis), thermal shutdown (+165°C trip), open-drain Power Good with 82–96% VOUT trip threshold, and internal current limiting (3.5–7 A). The NCV59745A variant includes active output discharge via a 600 Ω internal pull-down when EN is low or thermal shutdown activates.

Key Specifications

Pinout & Package

NCV59745AMW1015TAG is housed in a thermally enhanced QFNW20 (4.0 mm × 4.0 mm, 0.5 mm pitch) package with wettable flanks for automated optical inspection. The exposed thermal pad must be soldered to PCB ground for optimal thermal performance (R_JB = 3.6 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV59745AMW1015TAG, the NCV59745AMW100TAG offers identical performance except for 15 mV lower output voltage, while TLV75710PDRVR trades automotive qualification, dual-rail flexibility, and active discharge for lower cost and simpler biasing - making it viable only in non-safety-critical, non-automotive contexts.

Availability

NCV59745AMW1015TAG is available at Aetrix Electronics and suitable for automotive ADAS imaging systems, FPGA-based autonomous driving ECUs, and industrial high-speed SerDes applications requiring stable component supply across extended temperature and long product lifecycles.

Supply support for NCV59745AMW1015TAG 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 silicon solutions for automotive, industrial, cloud, and IoT applications.

The NCV59745AMW1015TAG belongs to onsemi's automotive-grade linear regulator product line, engineered specifically for low-noise, high-current point-of-load regulation in safety-critical vehicle subsystems.

FAQ

What is the output voltage tolerance of the NCV59745AMW1015TAG over temperature and load?

The NCV59745AMW1015TAG delivers ±0.3% typical output voltage accuracy across −40°C to +125°C junction temperature, 50 mA to 3.0 A load current, and VBIAS ≥ VOUT + 1.4 V. This tight tolerance ensures reliable operation of automotive FPGAs and DSPs without external trimming or feedback adjustment. The NCV59745AMW1015TAG achieves this via laser-trimmed internal reference and high-PSRR error amplifier design.

Does the NCV59745AMW1015TAG require an external capacitor on the SS pin for basic operation?

No, the NCV59745AMW1015TAG operates with minimum 0.35 ms startup time when the SS pin is left open. An external capacitor (CSS) is optional and used only to extend soft-start duration - e.g., 10 nF yields ~1.3 ms ramp time. Unlike noise-reduction capacitors in other LDOs, the CSS capacitor on the NCV59745AMW1015TAG has no effect on output noise performance.

How does the active discharge feature work in the NCV59745AMW1015TAG?

The NCV59745AMW1015TAG includes integrated active discharge: when EN is driven low or thermal shutdown triggers, an internal 600 Ω transistor pulls VOUT to GND, rapidly discharging the output capacitor. This ensures safe, repeatable restarts from 0 V - essential for automotive power sequencing where residual voltage could cause undefined SoC states. The feature is exclusive to NCV59745A variants like the NCV59745AMW1015TAG.

Can the NCV59745AMW1015TAG be used with only the VIN supply, without connecting VBIAS?

No. The NCV59745AMW1015TAG requires both VIN and VBIAS supplies: VIN feeds the NMOS pass element, while VBIAS (2.2–5.5 V, ≥VOUT + 1.4 V) powers the internal reference, error amplifier, and control circuitry. Omitting VBIAS will prevent regulation. In systems with single supply, VBIAS may be derived from VIN via a local LDO or resistor-divider + LDO, but direct connection to VIN is not recommended due to noise coupling.

What is the maximum allowable output capacitance for stable operation of the NCV59745AMW1015TAG?

The NCV59745AMW1015TAG is stable with output capacitance ranging from 10 µF to 1000 µF effective value, including ceramic, polymer tantalum, or parallel combinations. Stability is maintained regardless of ESR, unlike many PMOS LDOs. For best transient response in FPGA applications, use ≥47 µF MLCC plus 330 µF polymer tantalum - as validated in Figures 9–11 of the datasheet. Exceeding 1000 µF is not prohibited but offers diminishing returns in droop suppression.