onsemi NCV891330PD38R2G

Overview

NCV891330PD38R2G from onsemi is an automotive-grade dual-mode step-down regulator that operates as either a 2 MHz PWM buck converter (up to 3.0 A) or a low-noise LDO linear regulator, with 30 µA quiescent current in light-load mode and 5.0 V fixed output. It withstands 45 V load dump, features integrated N-channel power switch, and includes RSTB reset output with 16 ms delay-designed for infotainment and instrumentation systems requiring stable 5 V supply under wide battery voltage range.

For engineers reviewing the NCV891330PD38R2G datasheet, pinout, applications, or equivalent options, key selection considerations include its dual-mode operation threshold (3–40 mA), VIN UVLO (4.1–4.5 V start), ±2% output accuracy, thermal shutdown at 155 °C, and SOIC-8 EP package with exposed pad for thermal management.

Technical Context

The NCV891330PD38R2G implements hybrid regulation: it starts in PWM mode at power-up, then transitions to low-I_q linear mode when output current falls below 3–40 mA (depending on VIN), with <2 µs transition time. Mode selection is governed by internal current sensing, DRV voltage monitoring, and VIN foldback thresholds (18.4 V rising, 18 V falling).

Its control architecture integrates slope compensation (1.45–2.8 A/s), soft-start (0.8–2.0 ms), and analog short-circuit foldback (450–650 kHz) plus hiccup mode. The RSTB open-drain output asserts low on VOUT undervoltage (4.50–4.75 V for 5 V version), VIN overvoltage (>39 V), thermal shutdown, or DRV UVLO-enabling direct microcontroller interface without external logic.

Key Specifications

Pinout & Package

NCV891330PD38R2G uses SOIC-8 EP (Case 751AC) with exposed thermal pad electrically connected to Pin 4 (GND). The package supports ≤30 °C/W junction-to-ambient thermal resistance on 4-layer FR4 PCB with 645 mm² copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-mode automotive buck regulator applications.

Compared with TPS62933RTER and MAX20075ATPA/VY+, the NCV891330PD38R2G uniquely combines 5 V fixed output, 30 µA light-load I_q, integrated RSTB with hysteresis, and 45 V load-dump tolerance in SOIC-8 EP - making it optimal for cost-sensitive, space-constrained automotive modules where pin count and thermal simplicity are critical.

Availability

NCV891330PD38R2G is available at Aetrix Electronics and suitable for infotainment head units, digital instrument clusters, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature and automotive transient environments.

Supply support for NCV891330PD38R2G 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications, with leadership in power management and automotive-qualified components.

The NCV891330PD38R2G belongs to onsemi's NCV automotive power management portfolio, designed specifically for battery-connected ECUs needing ultra-low quiescent current, high-voltage resilience, and seamless mode transitions in driver information and safety systems.

FAQ

What output voltage does the NCV891330PD38R2G provide?

The NCV891330PD38R2G provides a fixed 5.0 V output with ±2% accuracy across temperature and load. Its marking code "PD38R2G" confirms the 5.0 V variant ('5' in position 5 of marking), distinct from the 3.3 V version NCV891330PD33R2G. This eliminates external feedback networks and simplifies design for 5 V–based microcontrollers and peripherals.

How does the NCV891330PD38R2G handle automotive load dump events?

The NCV891330PD38R2G withstands up to 45 V load dump transients on its VIN pin without damage or regulation loss, thanks to internal overvoltage clamping and robust process design. It remains operational through 36–39 V overvoltage shutdown thresholds and continues regulating down to 3.7 V input-ensuring uninterrupted power during cranking and alternator faults.

What is the function of the RSTB pin on the NCV891330PD38R2G?

The RSTB pin on the NCV891330PD38R2G is an open-drain reset output that pulls low when VOUT drops below 4.50–4.75 V (for 5 V version), during VIN overvoltage, thermal shutdown, or DRV UVLO. It includes 10–25 µs noise filtering and a 14–18 ms restart delay, enabling direct connection to microcontroller reset inputs without external timing components.

Does the NCV891330PD38R2G require external components for bootstrap operation?

Yes-the NCV891330PD38R2G requires two external capacitors: a 0.1 µF ceramic capacitor between BST and SW pins, and a 0.1 µF capacitor between DRV and GND. These are mandatory for proper high-side gate drive and internal DRV regulator stability; omitting them causes erratic switching or failure to start in PWM mode.

What thermal performance can be expected from the NCV891330PD38R2G in SOIC-8 EP package?

In SOIC-8 EP (Case 751AC) with exposed pad soldered to ≥645 mm² of 1 oz copper on FR4, the NCV891330PD38R2G achieves ≤30 °C/W junction-to-ambient thermal resistance. At 3 A load and 25 °C ambient, junction temperature rise is ~90 °C-well within its −40 °C to +150 °C operating range, provided minimum copper area and airflow guidelines are followed.