onsemi NCP706AMX300TAG

Overview

NCP706AMX300TAG from onsemi is a 1 A, ±1% precision very low dropout (LDO) linear regulator with enable and active output discharge, designed for post-regulation and Li-ion battery-powered systems. It delivers fixed 3.0 V output, operates from 2.4 V to 5.5 V input, achieves max 155 mV dropout at 1 A, and remains stable with only 1.0 µF ceramic output capacitance - deployed in space-constrained portable electronics including smartphones and tablets.

For engineers reviewing the NCP706AMX300TAG datasheet, pinout, applications, or equivalent options, key selection criteria include its 1% output accuracy over temperature/load/line, active discharge function for rapid rail collapse, thermal shutdown protection, and compatibility with ultra-small XDFN8 1.6 × 1.2 mm package layouts.

Technical Context

The NCP706AMX300TAG integrates a PMOS pass transistor enabling ultra-low dropout operation and internal soft-start to limit inrush current. Its remote sense (SNS) pin supports accurate regulation at the load by compensating for PCB trace IR drop, while the dual IN pins and exposed thermal pad optimize power delivery and junction temperature management.

It features independent EN pin logic control (0.9 V turn-on threshold, 0.4 V shutdown), internal current limiting (1.1 A typical), and thermal shutdown with 20°C hysteresis. PSRR reaches 60 dB at 1 kHz with 1 µF output capacitor, and output noise is specified at 300 µV_RMS (100 Hz–100 kHz).

Key Specifications

Pinout & Package

Package: XDFN8 1.6 × 1.2 mm, 0.4 mm pitch, exposed thermal pad (electrically tied to GND). Pin 3 is NC but recommended tied to GND for thermal relief; Pin 4 (SNS) must be routed directly to load for remote sensing accuracy.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B302MR-G and MIC5219-3.0YM5-TR, the NCP706AMX300TAG provides superior dropout performance, integrated remote sensing, and active discharge - making it the preferred choice for next-generation portable devices demanding high accuracy, fast power sequencing, and minimal board area.

Availability

NCP706AMX300TAG is available at Aetrix Electronics and suitable for smartphones, portable medical equipment, and wireless handsets requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP706AMX300TAG 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 electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The NCP706A series is part of onsemi's precision LDO portfolio, engineered specifically for battery-powered portable electronics requiring ultra-low dropout, high accuracy, and robust thermal performance in miniature packages.

FAQ

What is the maximum input voltage rating for the NCP706AMX300TAG?

The NCP706AMX300TAG has an absolute maximum input voltage of 6 V, but its recommended operating input range is 2.4 V to 5.5 V. Exceeding 5.5 V may trigger undervoltage lockout or compromise long-term reliability. The device is optimized for single-cell Li-ion (2.7–4.2 V) and post-regulation use cases where input stays within this window. Always observe derating guidelines in thermal design when operating near maximum ratings.

Does the NCP706AMX300TAG require an external resistor divider for output voltage setting?

No, the NCP706AMX300TAG is a fixed-output LDO with factory-trimmed 3.0 V regulation - no external resistors are needed. Its internal feedback network ensures ±1% accuracy across temperature, line, and load without user adjustment. This simplifies BOM and layout while guaranteeing consistent performance across production units. The SNS pin supports remote sensing but does not alter the nominal output voltage.

How does the active output discharge function work in the NCP706AMX300TAG?

When the EN pin is driven below 0.4 V, the NCP706AMX300TAG activates an internal 60 Ω discharge FET between OUT and GND. This rapidly collapses the output voltage - typically within 1 ms - preventing back-powering of upstream circuitry or unintended wake-up of downstream ICs. The function is automatic and requires no external components, making it ideal for power sequencing in portable devices with strict reset timing requirements.

Can the NCP706AMX300TAG operate with a 0.47 µF ceramic output capacitor?

No - the NCP706AMX300TAG requires a minimum of 1.0 µF ceramic output capacitance for guaranteed stability, as validated in the datasheet and typical application schematic. Using 0.47 µF risks oscillation, poor transient response, or thermal runaway under load. The 1.0 µF value is tightly specified to ensure phase margin and damping across process/voltage/temperature corners; lower values invalidate the stability guarantee.

Is the exposed thermal pad on the NCP706AMX300TAG electrically connected to any internal node?

Yes, the exposed thermal pad on the NCP706AMX300TAG is electrically connected to GND internally. It must be soldered to a PCB ground plane to meet the specified thermal resistance (R_JA = 160 °C/W) and prevent thermal shutdown during 1 A operation. Leaving the pad unconnected or floating will severely degrade thermal performance and may cause premature current limiting or shutdown under sustained load.