onsemi NCP3102BMNTXG

Overview

NCP3102BMNTXG 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%, and integrates dual MOSFET drivers with 275 kHz fixed-frequency voltage-mode PWM control. Used in FPGA/DSP core rail regulation where high current density and tight output tolerance are required.

For engineers reviewing the NCP3102BMNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include its 8 mΩ high-side/low-side R_DS(on), capacitor-programmable soft-start, resistor-set overcurrent threshold (50–550 mV), and QFN40 thermal performance (R_θJA = 35 °C/W).

Technical Context

The NCP3102BMNTXG implements voltage-mode PWM control with a transconductance error amplifier (2–5 mS gain, 4 MHz unity-gain bandwidth) and internal 275 kHz oscillator (±13% over –40°C to +125°C). It uses adaptive nonoverlap gate drive logic to minimize shoot-through and body diode conduction in its integrated high-side and low-side MOSFETs.

Protection architecture includes programmable short-circuit detection via BG pin (5 kΩ–55 kΩ ROCSET), UVLO with 4.0 V turn-on / 3.6 V turn-off hysteresis, and thermal shutdown at 150°C junction temperature. The device supports external compensation and requires no external bootstrap diode due to integrated charge pump.

Key Specifications

Pinout & Package

Package: 6 mm × 6 mm, 40-pin QFN (Case 485AK), exposed thermal pad, Pb-free (G suffix), moisture sensitivity level 3.

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 TPS546B24RVFR, the NCP3102BMNTXG offers optimal balance of analog simplicity, 10 A capability, and design flexibility-retaining external compensation and programmable protection while avoiding digital overhead or current rating compromise.

Availability

NCP3102BMNTXG is available at Aetrix Electronics and suitable for server VRMs, FPGA power modules, and industrial PLCs requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.

Supply support for NCP3102BMNTXG 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP3102BMNTXG belongs to onsemi's high-current DC-DC controller product line, engineered specifically for dense, high-efficiency point-of-load regulation in datacenter and edge computing infrastructure.

FAQ

What is the maximum input voltage the NCP3102BMNTXG can withstand on the BST pin?

The NCP3102BMNTXG BST pin tolerates up to 25 V with respect to GND and up to 15 V with respect to the PWRPHS node. This allows reliable high-side gate drive during input transients or brownout conditions without external clamping. The absolute maximum rating is specified in the Absolute Maximum Ratings table on page 3 of the datasheet, and operation beyond 25 V risks permanent damage to the bootstrap circuitry of the NCP3102BMNTXG.

Does the NCP3102BMNTXG integrate power MOSFETs, or does it require external switches?

The NCP3102BMNTXG integrates both high-side and low-side power MOSFETs with 8 mΩ R_DS(on) each, enabling fully integrated 10 A buck conversion without external switches. Its pinout (PWRVCC, PWRPHS, PWRGND) and block diagram confirm internal power stages. While it supports external high-side drive via TGIN/TGOUT pins for hybrid configurations, the default and validated operation uses internal MOSFETs - as demonstrated in the Figure 20 evaluation board schematic where Q1–Q3 are external but the NCP3102BMNTXG itself contains the primary switching elements.

How is overcurrent protection configured on the NCP3102BMNTXG?

Overcurrent protection on the NCP3102BMNTXG is configured by connecting a resistor (ROCSET) between the BG pin and GND. During startup, a 10 µA internal current source develops a voltage across ROCSET, which is sampled and held as the OC threshold (50–550 mV). For example, a 10 kΩ resistor sets ~100 mV threshold. If ROCSET is omitted, the device defaults to a fixed –375 mV threshold. This configuration is detailed in the "Overcurrent Protection Setting" section (page 7) and verified in Figure 22 of the NCP3102BMNTXG datasheet.

What is the purpose of the CPHS pin on the NCP3102BMNTXG?

The CPHS pin on the NCP3102BMNTXG senses the switching node (PWRPHS) voltage for phase timing and overcurrent detection. It provides feedback to the internal comparator that monitors the low-side MOSFET conduction period and triggers the current-limit latch when the phase voltage drops below the programmed OC threshold. As described in the PIN FUNCTION DESCRIPTION (page 2), CPHS must be routed with minimal trace length and capacitance to ensure accurate timing - critical for reliable short-circuit protection in the NCP3102BMNTXG.

Can the NCP3102BMNTXG operate with an input voltage lower than 4.5 V?

No, the NCP3102BMNTXG has a guaranteed minimum input voltage of 4.5 V per its Electrical Characteristics table (page 4). Operation below this violates the Recommended Operating Conditions and may cause erratic behavior, failure to start, or incomplete UVLO release. The UVLO rising threshold is 4.0 V, but the device requires ≥4.5 V to sustain stable switching, gate drive, and regulation - confirmed by efficiency curves (Figure 23) and transient testing (Figure 24) all conducted at V_IN ≥ 4.5 V. Using 3.3 V or 5 V logic rails directly is not supported for the NCP3102BMNTXG.