onsemi NCP5662DS15R4G

Overview

NCP5662DS15R4G from onsemi is a fixed-output, 1.5 V, 2.0 A low-dropout linear regulator in D2PAK package, featuring ultra-fast load transient response (≤3 µs settling), 26 µV_rms output noise without bypass capacitor, and integrated Enable and Error Flag functions. It delivers stable power for high-current ASIC core supplies and post-regulation in servers and networking equipment.

For engineers reviewing the NCP5662DS15R4G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 2.0 A (1.0–1.3 V), ground current independence from load (≤3.0 mA), thermal shutdown at 160°C, and error flag threshold at 91–97% of nominal output.

Technical Context

The NCP5662DS15R4G implements a bipolar-based LDO architecture with a 0.9 V internal reference, enabling precise 1.5 V regulation via trimmed resistor network. Its error flag circuitry monitors output voltage continuously and asserts logic-low output when V_OUT falls below 91% of nominal, with 50 µs blanking time to suppress false triggers during transients.

Enable control operates with TTL-compatible thresholds (V_EN(H) ≥ 1.3 V, V_EN(L) ≤ 0.3 V), and the device maintains stability with output capacitance as low as 10 µF (ESR 50–300 mΩ). Thermal protection activates at 160°C junction temperature, and current limiting clamps peak output to 3.0 A.

Key Specifications

Pinout & Package

D2PAK-5 (Case 936A−02), thermally enhanced surface-mount package with exposed tab connected to GND. Pin 1 = EN, Pin 2 = VIN, Pin 3 = GND (tab), Pin 4 = VOUT, Pin 5 = EF. Tab must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and NCP163AMX150TBG, the NCP5662DS15R4G uniquely combines 2.0 A output, integrated error flag, ultra-low noise without bypass cap, and D2PAK thermal performance - making it the only direct fit for high-current, fault-aware server and networking applications.

Availability

NCP5662DS15R4G is available at Aetrix Electronics and suitable for server motherboard design, ASIC power delivery, and networking equipment requiring stable component supply with automotive-grade traceability and long-term lifecycle support.

Supply support for NCP5662DS15R4G 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP5662DS15R4G belongs to onsemi's high-current LDO family designed specifically for demanding server, networking, and high-performance computing applications where ultra-fast transient response and fault visibility are mandatory.

FAQ

What is the maximum input voltage rating for the NCP5662DS15R4G?

The NCP5662DS15R4G has an absolute maximum input voltage rating of 18 V. However, its recommended operating input range is 2.0 V to 9.0 V - with minimum input determined by dropout voltage (V_IN ≥ V_OUT + V_DO). At 2.0 A load, V_DO is typically 1.0 V, so minimum functional input is 2.5 V for reliable 1.5 V output. Exceeding 9.0 V may degrade long-term reliability despite the 18 V absolute limit.

Does the NCP5662DS15R4G require an external bypass capacitor for low-noise operation?

No, the NCP5662DS15R4G does not require an external bypass capacitor to achieve its specified 26 µV_rms output noise. This is enabled by its internal low-noise architecture and bipolar process design. While adding a 1–10 nF ceramic capacitor between ADJ/EF and GND may further reduce high-frequency noise in sensitive RF sections, it is not necessary for meeting datasheet noise specifications in standard digital applications.

How does the Error Flag (EF) pin function on the NCP5662DS15R4G?

The EF pin on the NCP5662DS15R4G is an open-collector output that pulls low when the regulated output voltage drops below 91–97% of nominal (i.e., below 1.365–1.455 V for 1.5 V output). It includes 50 µs internal blanking to ignore brief transients. An external 100 kΩ pull-up resistor to VIN is required for proper logic-high state. The NCP5662DS15R4G's EF pin enables real-time monitoring without external supervisors - critical for server health-check firmware.

What thermal performance can be expected from the NCP5662DS15R4G in a standard PCB layout?

In a standard 1 oz copper PCB layout with 1 sq in thermal pad connected to the D2PAK tab, the NCP5662DS15R4G achieves R_JA = 45°C/W. At 2.0 A output with 2.5 V input (1.0 V dropout), power dissipation is 2.0 W - resulting in ~90°C junction rise above ambient. With 85°C max ambient, junction temperature reaches ~175°C, triggering thermal shutdown. To sustain full load, increase copper area or add airflow; doubling copper area reduces R_JA to ~35°C/W.

Is the NCP5662DS15R4G pin-compatible with other devices in the NCP5662 family?

Yes, all D2PAK-packaged NCP5662 variants - including NCP5662DS12R4G (1.2 V), NCP5662DS15R4G (1.5 V), and NCP5662DS33R4G (3.3 V) - share identical pinout (EN/VIN/GND/VOUT/EF) and footprint. This allows single PCB design reuse across multiple output voltages. However, EF functionality is only active on fixed-output versions; adjustable versions (e.g., NCP5662DSADJR4G) replace EF with ADJ pin - requiring different schematic routing and layout.