onsemi NCP3102MNTXG

Overview

NCP3102MNTXG from onsemi is a 10 A synchronous buck DC-DC converter IC designed for wide-input industrial and computing power supplies. It operates from 4.5 V to 13.2 V input, delivers adjustable output down to 0.8 V ±1%, uses internal 275 kHz PWM control, and integrates high- and low-side MOSFET drivers with R_DS(on) ≤ 8 mΩ each - enabling high-efficiency (≥90%) regulation in server VRMs and FPGA core supplies.

For engineers reviewing the NCP3102MNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include its 40-pin QFN package thermal performance (R_θJA = 35 °C/W), externally compensated transconductance error amplifier, capacitor-programmable soft-start, and resistor-configurable overcurrent threshold (50–550 mV) - all critical for stable 10 A load transient response in dense PCB layouts.

Technical Context

The NCP3102MNTXG implements voltage-mode PWM control with a fixed 275 kHz oscillator and an operational transconductance amplifier (OTA) featuring 2–5 mS transconductance and ≥55 dB open-loop DC gain. Its adaptive nonoverlap gate drive minimizes body diode conduction, supporting efficient synchronous rectification.

It integrates dual MOSFET drivers (1 A sink/source), bootstrap supply management (BST rated to 25 V wrt GND), and programmable protection including UVLO (4.0 V rising, 0.4 V hysteresis) and short-circuit detection via phase-node sensing with 500 ns minimum LS-FET on-time.

Key Specifications

Pinout & Package

Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch, exposed thermal pad), case 485AK, Pb-free (G suffix). Thermal resistance R_θJA = 35 °C/W on 110 mm × 100 mm double-layer PCB with 35 µm copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Compared with MP2315DJ-LF-Z and TPS546B24RVFT, the NCP3102MNTXG offers optimal analog simplicity for fixed-frequency 10 A applications - delivering proven thermal performance in its 40-pin QFN without requiring configuration tools or sacrificing programmable protection features.

Availability

NCP3102MNTXG is available at Aetrix Electronics and suitable for server VRMs, FPGA core supplies, and industrial CPU modules requiring stable component supply, long-term lifecycle support, and consistent Pb-free QFN packaging.

Supply support for NCP3102MNTXG 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and edge applications - with leadership in power management, imaging, and signal processing.

The NCP3102MNTXG belongs to onsemi's high-current synchronous buck controller product line, engineered specifically for high-density, high-efficiency DC-DC conversion in datacenter and networking infrastructure where thermal performance and transient response are critical.

FAQ

What is the maximum input voltage rating for NCP3102MNTXG?

The NCP3102MNTXG supports a maximum input voltage of 13.2 V on both VCC and PWRVCC pins. The BST pin tolerates up to 25 V with respect to GND (but only 15 V with respect to PWRPHS), enabling reliable operation across standard 5 V and 12 V intermediate bus architectures. Absolute maximum ratings must not be exceeded in continuous operation.

How does the NCP3102MNTXG implement overcurrent protection?

The NCP3102MNTXG implements overcurrent protection via phase-node voltage sensing during low-side FET conduction. A resistor (R_OCSET) between BG and GND programs the OC threshold from 50 mV to 550 mV; if unconnected, it defaults to a fixed –375 mV trip. Upon detection, the PWM logic shuts down both gates and initiates a full soft-start recovery cycle.

Can NCP3102MNTXG operate with an output voltage lower than 0.8 V?

No - the NCP3102MNTXG has a fixed internal reference voltage of 0.8 V ±1%, and the feedback architecture is designed for output regulation ≥0.8 V. External resistor dividers scale higher outputs (up to 5 V), but the device cannot regulate below its reference voltage. For sub-0.8 V applications, a different controller with adjustable reference or external reference injection is required.

What is the purpose of the CPHS pin on NCP3102MNTXG?

CPHS (Controller Phase Sensing) monitors the switching node (PWRPHS) to ensure proper bootstrap capacitor charging and detect abnormal phase transitions. It provides timing information to the internal gate driver logic, enabling adaptive nonoverlap control and contributing to fault detection during overcurrent or shoot-through events - critical for reliable synchronous operation.

Does NCP3102MNTXG require external MOSFETs or integrate them?

The NCP3102MNTXG integrates high- and low-side power MOSFETs with R_DS(on) ≤ 8 mΩ each, eliminating the need for external switches in 10 A designs. However, it also supports external MOSFET configurations via TGOUT and TGIN pins - offering flexibility for higher-current or thermally optimized implementations using discrete FETs.