onsemi NCP706ABMX300TAG

Overview

NCP706ABMX300TAG from onsemi is a 3.0 V fixed-output, 1 A very low dropout (LDO) linear regulator with ±1% output accuracy over line, load, and temperature, active output discharge, latched overcurrent protection, and thermal shutdown - designed for Li-ion battery-powered portable electronics requiring stable 3.0 V rail under tight space constraints.

For engineers reviewing the NCP706ABMX300TAG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1 A (155 mV typ), PSRR (58 dB @ 1 kHz), quiescent current (200 µA typ), compatibility with 2.2 µF ceramic output capacitor, and active discharge functionality unique to the AB variant.

Technical Context

The NCP706ABMX300TAG implements a PMOS pass transistor architecture enabling ultra-low dropout (155 mV at 1 A) and high PSRR (65 dB @ 100 Hz). Its internal soft-start limits inrush current, while the latched OCP triggers at ~1.65 A and requires EN toggle to reset.

It features remote sensing via SNS pin for improved load regulation, an enable input with 0.9 V HI / 0.4 V LO thresholds, and an exposed thermal pad electrically tied to GND. The active output discharge circuit pulls OUT to GND when EN is low, preventing floating outputs during shutdown.

Key Specifications

Pinout & Package

Package: XDFN8 1.6 mm × 1.2 mm, 0.4 mm pitch, exposed thermal pad (Case 711AS). Compact footprint ideal for smartphones, tablets, and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B302MR-G and AP7361-30SG-7, the NCP706ABMX300TAG uniquely combines ultra-low dropout, active discharge, latched OCP, and remote sensing - making it optimal for high-reliability, space-constrained Li-ion systems demanding precise, safe, and responsive regulation.

Availability

NCP706ABMX300TAG is available at Aetrix Electronics and suitable for smartphone power management, portable medical instrumentation, wireless headset audio subsystems, and other battery-powered applications requiring stable component supply with guaranteed long-term sourcing.

Supply support for NCP706ABMX300TAG 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 focused on energy-efficient innovation for automotive, industrial, cloud, medical, and IoT applications.

The NCP706ABMX300TAG belongs to onsemi's precision LDO family engineered for portable electronics - emphasizing ultra-low dropout, minimal quiescent current, small footprint, and robust protection for Li-ion battery systems.

FAQ

What is the minimum input voltage required for the NCP706ABMX300TAG to regulate 3.0 V at 1 A?

The NCP706ABMX300TAG maintains regulation down to VIN = VOUT + VDO = 3.0 V + 0.155 V = 3.155 V (typ) at 1 A load. Its absolute minimum operating input is 2.4 V, but below ~3.16 V, output voltage drops linearly with input - so 3.155 V is the practical lower limit for full 3.0 V regulation at full load. The device remains functional (e.g., in dropout or shutdown) across the full 2.4–5.5 V range.

Does the NCP706ABMX300TAG require an external resistor network to set output voltage?

No, the NCP706ABMX300TAG is a fixed 3.0 V output LDO - no external resistors are needed. It is part of the NCP706AB family with factory-trimmed internal feedback, delivering ±1% accuracy across temperature, line, and load without external components. Adjustable versions (e.g., NCP706ABDR2G) exist but are distinct part numbers; the NCP706ABMX300TAG is strictly fixed-output.

How does the active output discharge function work in the NCP706ABMX300TAG?

In the NCP706ABMX300TAG, active output discharge engages automatically when the EN pin is driven ≤0.4 V. An internal ~60 Ω FET connects OUT to GND, discharging the output capacitor rapidly - typically within milliseconds. This prevents residual voltage from powering downstream circuits or causing glitches during power sequencing. The feature is exclusive to the "AB" variant; standard NCP706B parts lack this circuit.

Can the NCP706ABMX300TAG operate without connecting the SNS pin?

Yes, the NCP706ABMX300TAG will operate normally with the SNS pin left unconnected or tied to OUT - but doing so forfeits remote sensing benefits. When SNS is connected directly to the load side of the output trace, it compensates for voltage drop across PCB traces, improving load regulation accuracy by up to 2 mV. If trace resistance is negligible (<10 mΩ), omitting SNS has no functional impact on regulation.

What thermal considerations apply to the NCP706ABMX300TAG in a 1 A application?

At 1 A with 3.3 V input and 3.0 V output, the NCP706ABMX300TAG dissipates ~300 mW (PD = (VIN−VOUT) × IOUT). With R_JA = 160°C/W, junction temperature rise is ~48°C above ambient - acceptable up to +77°C ambient for 150°C max TJ. To ensure reliability, the exposed thermal pad must be soldered to a ≥100 mm² copper pour connected to inner-layer ground planes; pin 3 (N/C) should also be grounded to aid heat spreading.