onsemi NCP5662DS33R4G

Overview

NCP5662DS33R4G from onsemi is a fixed-output, 3.3 V, 2.0 A ultra-fast transient response low-dropout linear regulator in D2PAK package, featuring 1.0 V typical dropout at full load, 26 µV_rms output noise without bypass capacitor, and integrated Error Flag for power-good monitoring in server and ASIC power supplies.

For engineers reviewing the NCP5662DS33R4G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.3 V ±1% output accuracy over −40°C to +85°C, thermal shutdown at 160°C, enable-controlled sequencing, and compatibility with 10–150 µF ceramic output capacitors for stable high-current regulation.

Technical Context

The NCP5662DS33R4G implements a bipolar-based LDO architecture with a 0.9 V internal reference, enabling precise 3.3 V output via resistor-free fixed-voltage configuration. Its error amplifier drives a robust output stage capable of sustaining 2.0 A DC load while maintaining sub-50 ns load transient recovery (Figure 20–23).

Thermal management relies on the D2PAK's 5.0°C/W junction-to-case resistance and exposed tab (EPAD) tied to PCB ground plane. The Error Flag (Pin 5) asserts logic-low when V_OUT falls below 91–97% of nominal, with 50 µs blanking time to suppress false triggers during fast transients.

Key Specifications

Pinout & Package

D2PAK-5 (Case 936A-02), thermally enhanced surface-mount package with exposed copper tab (EPAD) requiring direct connection to PCB ground plane for optimal thermal performance (R_JC = 5.0°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and MCP1826T-3302E/OT, the NCP5662DS33R4G uniquely combines Error Flag monitoring, D2PAK thermal robustness (R_JC = 5.0°C/W), and 26 µV_rms noise without bypass capacitor - making it optimal for industrial and telecom systems demanding reliability, diagnostics, and layout simplicity.

Availability

NCP5662DS33R4G is available at Aetrix Electronics and suitable for server VRMs, ASIC power supplies, and networking equipment requiring stable component supply with automotive-grade traceability and long-term lifecycle support.

Supply support for NCP5662DS33R4G 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 computing, and IoT applications.

The NCP5662 series belongs to onsemi's high-current LDO portfolio, engineered specifically for post-regulation in high-power digital systems where ultra-fast transient response, low noise, and integrated diagnostics are critical.

FAQ

What is the maximum input voltage rating for the NCP5662DS33R4G?

The NCP5662DS33R4G has an absolute maximum input voltage of 18 V, but its recommended operating input range is 4.3 V to 9.0 V (V_OUT + V_DO ≤ V_IN ≤ 9 V). Exceeding 9 V continuously increases power dissipation and thermal stress, especially at full 2.0 A load. The device includes overvoltage clamp protection on the EN pin but does not regulate beyond 18 V absolute rating.

Does the NCP5662DS33R4G require an external bypass capacitor for low-noise operation?

No, the NCP5662DS33R4G delivers 26 µV_rms output noise without any external bypass capacitor due to its internal noise-reduction architecture. This eliminates the need for a dedicated 1–10 nF ceramic capacitor typically used with other LDOs, simplifying layout and reducing BOM count while maintaining noise performance across 10 Hz–100 kHz.

How is the Error Flag (EF) pin on the NCP5662DS33R4G configured and used?

The EF pin on the NCP5662DS33R4G is an open-drain output that pulls low when V_OUT drops below 91–97% of nominal (3.003–3.201 V). It requires a 100 kΩ pull-up resistor to VIN. The EF signal remains asserted for ≥50 µs after fault onset, providing glitch immunity. No pull-up is needed if EF is unused, as the pin is internally high-impedance when inactive.

What thermal considerations apply to the NCP5662DS33R4G in D2PAK package?

The NCP5662DS33R4G in D2PAK has R_JC = 5.0°C/W and R_JA = 45°C/W (with 1 in² 1 oz Cu). To sustain 2.0 A at 3.3 V output from 5.0 V input (1.7 V drop), power dissipation is ~3.4 W - requiring ≥12 cm² copper area and forced airflow or heatsinking above 1.5 A in enclosed environments. Thermal shutdown activates at 160°C junction temperature.

Can the NCP5662DS33R4G be used in automotive applications?

The NCP5662DS33R4G is rated for −40°C to +85°C ambient and is not AEC-Q100 qualified. For automotive use, select the NCV5662DS33R4G variant (NCV prefix), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C), PPAP-capable, and manufactured under automotive-specific process controls - the NCP version is intended for industrial and computing applications only.