onsemi NCV4276DSADJG

Overview

NCV4276DSADJG from onsemi is an automotive-grade 400 mA adjustable-output low-dropout linear regulator with ±4% output voltage accuracy, 500 mV max dropout (at 250 mA, 5.0 V output), reverse input voltage protection (−42 V), and +45 V peak transient tolerance. It operates from −40°C to +150°C and features inhibit control, thermal shutdown, and short-circuit protection - deployed in engine control units, body electronics, and ADAS power rails.

For engineers reviewing the NCV4276DSADJG datasheet, pinout, applications, or equivalent options, key selection criteria include its adjustable output range (2.5 V to 20 V), D2PAK-5 surface-mount package with heatsink-connected GND pin, wide input voltage range (4.5 V to 40 V), and fault protections critical for harsh automotive environments.

Technical Context

The NCV4276DSADJG uses a PNP series pass transistor driven by an error amplifier referencing a temperature-stable 2.5 V bandgap, enabling low dropout and minimal ground current across load and temperature. Its saturation control logic prevents oversaturation during low-input or overload conditions.

Inhibit functionality allows active-low enable/disable via Pin 2 (INH), with defined thresholds: output disables below 0.5 V (typical) and enables above 3.5 V (typical). The adjustable version sets output voltage via external resistor divider on Pin 4 (VA), where V_Q = [(R₁ + R₂) × 2.5 V] / R₂, supporting precise rail generation from 2.5 V to 20 V.

Key Specifications

Pinout & Package

D2PAK-5 surface-mount package (Case 936A, DS suffix) with exposed tab internally connected to Pin 3 (GND) for direct heatsink mounting. Thermal resistance: R_θJA = 74.8°C/W (0.4 sq. in. spreader board) or 41.6°C/W (1.2 sq. in. spreader board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV4276DSADJG, NCV8664DSADJG offers superior voltage accuracy at the expense of transient margin, while TLE4276-2G sacrifices flexibility and control for lower unit cost in fixed-rail deployments.

Availability

NCV4276DSADJG is available at Aetrix Electronics and suitable for automotive ECU power management, ADAS sensor modules, and body electronics requiring stable component supply across extended temperature and voltage stress conditions.

Supply support for NCV4276DSADJG 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, and IoT applications.

The NCV4276DSADJG belongs to onsemi's SMART REGULATOR® family, engineered specifically for automotive power management with integrated fault protection, wide temperature operation, and robust electrical survivability.

FAQ

What is the minimum input voltage required for NCV4276DSADJG to regulate at 5.0 V output?

The minimum input voltage for NCV4276DSADJG is the greater of (V_Q + 0.5 V) or 4.5 V. For a 5.0 V output, this means VI(min) = 5.5 V. Below this, dropout behavior begins and regulation is no longer guaranteed - confirmed in Electrical Characteristics Table (Note 1) and Circuit Description section.

Can NCV4276DSADJG be used without the external resistor divider on the VA pin?

Yes - connecting Pin 4 (VA) directly to Pin 5 (Q) configures NCV4276DSADJG to deliver a fixed 2.5 V output, as stated in the "Setting the Output Voltage" section (page 16). This bypasses the adjustable function but retains all protection features and thermal performance.

Does NCV4276DSADJG require an input capacitor, and if so, what value?

Yes - the datasheet specifies two input capacitors: CI1 = 1.0 µF (bulk) and CI2 = 100 nF (high-frequency bypass), placed close to Pins 1 and 2. This dual-capacitor configuration stabilizes input impedance and prevents oscillation due to PCB trace inductance, per Figure 3 and Regulator Stability Considerations (page 15).

How does the inhibit function behave during fast input voltage slew rates?

During startup, NCV4276DSADJG remains disabled if input voltage rises faster than 30 V/s - a built-in feature to prevent uncontrolled turn-on during battery connection transients. This behavior is explicitly documented in the "Inhibit Input" section (page 15) and ensures safe power sequencing.

What thermal derating applies to NCV4276DSADJG when mounted on a 0.4 sq. in. copper spreader?

With a 0.4 sq. in. copper spreader board (1 oz), NCV4276DSADJG has R_θJA = 74.8°C/W (D2PAK package). At 25°C ambient, maximum continuous output current drops to ~320 mA before reaching 150°C junction limit - calculated using PD(max) = (VI − VQ) × IQ + VI × Iq and R_θJA = (T_J − T_A) / PD, per Thermal Characteristics table (page 3) and Power Dissipation section (page 17).