onsemi NCP5662MN15R2G

Overview

NCP5662MN15R2G from onsemi is a fixed-output, 1.5 V, 2.0 A ultra-fast transient response low dropout linear regulator in a Pb-free DFN8 package. It features 1.0 V typical dropout at full load, 26 µV_rms output noise without bypass capacitor, and integrated Enable and Error Flag functions. Designed for post-regulation in high-current server and ASIC power supplies, it delivers stable low-voltage bias under dynamic load conditions.

For engineers reviewing the NCP5662MN15R2G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.5 V ±1% output accuracy over −40°C to +85°C, thermal shutdown at 160°C, and error flag assertion at 91–97% of nominal V_OUT with 50 µs blanking time.

Technical Context

The NCP5662MN15R2G implements a bipolar-based LDO architecture with a 0.9 V internal reference and precision feedback loop enabling tight output regulation. Its ultra-fast transient response (settling in 1–3 µs) stems from high-gain error amplifier design and optimized internal compensation, independent of external capacitor ESR.

It integrates dual protection: current limiting clamps peak output to 3.0 A and thermal shutdown activates at 160°C. The Error Flag pin (Pin 1 in DFN8) provides open-drain logic-low indication when V_OUT drops below 91–97% of 1.5 V, requiring only a 100 kΩ pull-up to VIN for operation.

Key Specifications

Pinout & Package

Package: 8-pin DFN (Dual Flat No-lead), 4.0 mm × 4.0 mm × 0.85 mm body, exposed thermal pad (EPAD) connected to GND per datasheet Case 488AF.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and MCP1826T-1502E/DB, the NCP5662MN15R2G uniquely balances 26 µV_rms noise, integrated EF functionality, and DFN8 thermal performance at mid-tier cost-making it optimal for high-density server and networking applications demanding both reliability and responsiveness.

Availability

NCP5662MN15R2G is available at Aetrix Electronics and suitable for server motherboard power delivery, ASIC I/O bank regulation, and networking equipment post-regulation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for NCP5662MN15R2G 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 NCP5662MN15R2G belongs to onsemi's high-current LDO family engineered for demanding post-regulation tasks in datacenter and telecom infrastructure, where ultra-fast transient response and integrated fault monitoring are essential.

FAQ

What is the maximum input voltage rating for the NCP5662MN15R2G?

The NCP5662MN15R2G has an absolute maximum input voltage (V_IN) of 18 V. However, its recommended operating input range is (V_OUT + V_DO) to 9 V - meaning for 1.5 V output, minimum valid input is ~2.5 V (1.5 V + 1.0 V dropout), and maximum safe operating input is 9 V per datasheet Section 4. Exceeding 9 V continuously risks thermal overstress despite the 18 V absolute rating.

Does the NCP5662MN15R2G require an external bypass capacitor for stability?

No, the NCP5662MN15R2G does not require an external bypass capacitor for stability or noise reduction. Its internal design achieves 26 µV_rms output noise without one, as confirmed in Electrical Characteristics Table on page 5 and Application Information section. A minimum 10 µF output capacitor with 50–300 mΩ ESR is required for loop stability, but no separate bypass cap is needed.

How is the Error Flag (EF) pin used on the NCP5662MN15R2G?

The EF pin (Pin 1) on the NCP5662MN15R2G is an open-drain output that pulls low when V_OUT falls below 91–97% of 1.5 V. It requires an external 100 kΩ pull-up resistor to V_IN. The EF signal remains asserted for ≥50 µs after fault onset, preventing false triggers during brief transients. This feature enables real-time rail health monitoring in systems using the NCP5662MN15R2G.

What thermal performance can be expected from the NCP5662MN15R2G in a standard PCB layout?

In a standard layout with 1 sq-in of 1 oz copper connected to the EPAD, the NCP5662MN15R2G achieves R_JA = 78°C/W. At 2.0 A load with 1.0 V dropout (2.0 W dissipation), junction temperature rise is ~156°C above ambient - so maximum ambient must be limited to ~−20°C for safe operation at 150°C T_J(max). For +85°C ambient, derating to ~1.3 A is recommended unless enhanced copper or airflow is used.

Is the NCP5662MN15R2G pin-compatible with other variants in the NCP5662 family?

Yes, the NCP5662MN15R2G shares identical DFN8 pinout and footprint with all other NCP5662MNxR2G variants (e.g., NCP5662MN33R2G, NCP5662MNADJR2G). Pin functions - EF/EN/GND/VIN/VOUT - remain consistent across fixed and adjustable versions. Only the internal feedback network differs; no PCB changes are needed when substituting between 1.5 V, 3.3 V, or adjustable-output DFN8 variants.