onsemi NCP730BMT250TBG

Overview

NCP730BMT250TBG from onsemi is a CMOS low-dropout (LDO) voltage regulator delivering 150 mA output current with 2.5 V fixed output, 38 V max input, and 1.8 µA typical quiescent current. It integrates a power-good (PG) output for sequencing or microcontroller reset, features 290 mV dropout at 150 mA, ±1% output accuracy, and operates across −40 °C to +125 °C - ideal for battery-powered always-on systems in metering and home automation.

For engineers reviewing the NCP730BMT250TBG datasheet, pinout, applications, or equivalent options, key selection criteria include PG functionality timing (120–600 µs delay), thermal shutdown threshold (165 °C), stable operation with 1 µF ceramic output capacitors, and compatibility with high-input-voltage industrial rails up to 38 V.

Technical Context

The NCP730BMT250TBG implements a precision bandgap reference (1.2 V) and error amplifier driving a PMOS pass transistor, enabling low dropout and fast transient response. Its internal UVLO (1.95 V nominal) and EN comparator with 0.1 V hysteresis ensure reliable enable/disable control under varying input conditions.

Version B includes a dedicated PG comparator monitoring VOUT against 93% of nominal output, with deglitching (75–270 µs) and delay timing (120–600 µs) to prevent false assertions during startup or load transients. Thermal shutdown activates at 165 °C with 20 °C hysteresis, and short-circuit current limiting caps peak output at 280 mA.

Key Specifications

Pinout & Package

Package: WDFN-6 (2 mm × 2 mm, 0.75 mm height, exposed pad), RoHS-compliant, moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2502E/MB and TLD1124-1ES, the NCP730BMT250TBG uniquely combines 38 V input tolerance, 1.8 µA IQ, and a dedicated PG output - making it the only option among the three that supports both high-voltage industrial rails and reliable power sequencing in battery-constrained systems.

Availability

NCP730BMT250TBG is available at Aetrix Electronics and suitable for battery-powered metering, home automation sensors, and industrial remote controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP730BMT250TBG 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP730 product line targets ultra-low-power, high-input-voltage LDO regulation - specifically engineered for always-on, battery-constrained systems needing precise power sequencing and robust thermal protection.

FAQ

What is the maximum input voltage rating for the NCP730BMT250TBG?

The NCP730BMT250TBG has an absolute maximum input voltage rating of 40 V, with recommended operating range from 2.7 V to 38 V. Operation above 38 V is not advised for long-term reliability, and input transients exceeding 40 V may cause permanent damage per the Absolute Maximum Ratings table in the datasheet.

Does the NCP730BMT250TBG require an external resistor divider to set its output voltage?

No, the NCP730BMT250TBG is a fixed-output variant delivering 2.5 V without external components. Its ADJ pin (Pin 2) is not connected internally and should be tied to GND for thermal enhancement - unlike adjustable versions, no resistor network is needed or supported.

How does the power-good (PG) output behave during startup and fault conditions for the NCP730BMT250TBG?

The NCP730BMT250TBG PG output remains low until VOUT reaches ≥93% of 2.5 V (≥2.325 V), then asserts high after a 120–600 µs delay. If VOUT drops below this threshold due to overload or input collapse, PG pulls low within 75–270 µs (deglitch time) - providing clean, debounced sequencing signals for microcontrollers.

Can the NCP730BMT250TBG operate with only a 1 µF output capacitor?

Yes, the NCP730BMT250TBG is explicitly designed to remain stable with a minimum 1 µF ceramic output capacitor (X5R/X7R). Larger values improve PSRR and load transient response, but 1 µF meets all stability requirements and is sufficient for most low-noise, low-current applications.

What thermal performance can be expected from the NCP730BMT250TBG in a standard 2-layer PCB layout?

In a JEDEC-standard 1S2P board (650 mm² GND copper area, 1 oz Cu), the NCP730BMT250TBG achieves R_thJA = 67 °C/W. With proper thermal vias under the exposed pad, junction-to-board resistance drops to 44 °C/W - enabling 150 mA continuous operation at ambient temperatures up to +85 °C without forced airflow.