onsemi NCP4589DSQ30T1G

Overview

NCP4589DSQ30T1G from onsemi is a 300 mA tri-mode CMOS LDO voltage regulator with 3.0 V fixed output, operating from 1.4 V to 5.25 V input, featuring auto Eco mode switching at light load (≤2 mA), fast mode activation above 8 mA, and standby current of 0.1 µA - deployed in battery-powered image sensors and portable communication devices.

For engineers reviewing the NCP4589DSQ30T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 300 mA (230 mV typ. @ VOUT = 2.8 V), ±1% output accuracy (>2 V), PSRR of 70 dB at 1 kHz (fast mode), ceramic capacitor stability, and SC−70 package thermal resistance (263 °C/W).

Technical Context

The NCP4589DSQ30T1G implements a tri-mode architecture: low-power mode (1.0 µA IQ for VOUT ≤ 1.85 V), fast-response mode (55 µA supply current), and standby mode (0.1 µA). Mode selection is controlled by the AE pin, enabling automatic transition between modes based on output load current thresholds (IOUTL = 1–2 mA, IOUTH = 8 mA).

It integrates fold-back current limiting, output discharge capability (D-version), and operates stably with 1 µF ceramic output capacitors. The device supports input voltages down to 1.4 V and delivers 3.0 V output with ±1% accuracy over −40°C to +85°C ambient temperature.

Key Specifications

Pinout & Package

Package: SC−70−5 (Case 419A−02), 1.8 mm × 1.3 mm × 0.9 mm, Pb-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1804T-3002I/OT and TLC76030DCQR, the NCP4589DSQ30T1G uniquely combines 300 mA capability, tri-mode intelligence, and 230 mV dropout - enabling longer battery life and tighter voltage regulation in dynamically loaded portable imaging and wireless systems.

Availability

NCP4589DSQ30T1G is available at Aetrix Electronics and suitable for battery-powered imaging systems, portable audio devices, and low-power wireless modules requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for NCP4589DSQ30T1G 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and portable electronics.

The NCP4589DSQ30T1G belongs to the NCP4589 family of tri-mode LDOs engineered specifically for battery-constrained applications demanding adaptive power efficiency without compromising transient response or output precision.

FAQ

What is the output voltage tolerance of the NCP4589DSQ30T1G over temperature?

The NCP4589DSQ30T1G provides ±1% output voltage accuracy at TJ = 25°C for VOUT > 2 V. Over the full operating temperature range (−40°C to +85°C), output voltage deviation is ±1.5%, verified per the Electrical Characteristics table in the official datasheet. This tolerance ensures reliable operation of 3.0 V–rated image sensors and microcontrollers under varying environmental conditions. The NCP4589DSQ30T1G maintains this specification without external trimming components.

Does the NCP4589DSQ30T1G require an external capacitor for stability?

Yes, the NCP4589DSQ30T1G requires a minimum 1 µF ceramic output capacitor (X5R or X7R dielectric) placed adjacent to the VOUT and GND pins for guaranteed stability. The datasheet explicitly states that tantalum capacitors with high ESR may cause oscillation, and parallel ceramic capacitors can also destabilize the loop. Input decoupling similarly requires a 1 µF ceramic capacitor at VIN–GND. These values are validated across all operating conditions for the NCP4589DSQ30T1G.

How does the AE pin affect the performance of the NCP4589DSQ30T1G?

The AE pin on the NCP4589DSQ30T1G selects between auto Eco mode (AE = low) and forced fast mode (AE = high). In auto Eco mode, the regulator dynamically switches between low-power and fast modes based on load current thresholds (1–2 mA turn-off, 8 mA turn-on). When AE is high, it remains permanently in fast mode - optimizing PSRR (70 dB) and transient response at the cost of higher quiescent current (55 µA). This dual-control capability is unique to the NCP4589DSQ30T1G among SC−70 LDOs.

Is the NCP4589DSQ30T1G compatible with lead-free reflow processes?

Yes, the NCP4589DSQ30T1G is Pb-free and qualified for standard lead-free reflow soldering per JEDEC J-STD-020. Its SC−70 package uses matte tin plating and is rated for peak reflow temperatures up to 260°C. The device complies with RoHS Directive 2011/65/EU and follows onsemi's Pb-free manufacturing and packaging guidelines documented in SOLDERRM/D. No special process adjustments are needed for the NCP4589DSQ30T1G.

What is the maximum power dissipation of the NCP4589DSQ30T1G in SC−70 package?

The NCP4589DSQ30T1G has a maximum power dissipation rating of 380 mW in the SC−70 package (Case 419A), derived from its thermal resistance R_JA = 263 °C/W and maximum junction temperature of 150°C. At ambient temperature of 85°C, this allows ~250 mW continuous dissipation (ΔT = 65°C). Real-world derating depends on PCB copper area and airflow; the datasheet recommends adequate thermal pad layout to sustain 300 mA output at elevated input–output differentials. This value is specific to the NCP4589DSQ30T1G in SC−70 configuration.