onsemi NCP584LSN12T1

Overview

NCP584LSN12T1 from onsemi is a 3-mode, 200 mA low-dropout linear regulator with fixed 1.2 V output, designed for portable battery-powered systems requiring precise voltage regulation, ultra-low quiescent current in low-power mode (3.5 µA), and high ripple rejection. It operates across −40°C to +85°C, supports CE-controlled enable/disable, and uses the ECO pin to select Fast Transient (FT) or Low Power (LP) modes - critical for power-sensitive handheld instrumentation and camcorders.

For engineers reviewing the NCP584LSN12T1 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 200 mA (≤300 mV), ±2% output accuracy in active mode, SOT23-5 package constraints, and mode-switching behavior between FT and LP via ECO pin voltage level.

Technical Context

The NCP584LSN12T1 implements a three-state LDO architecture: Chip Enable (CE) mode for full shutdown, Fast Transient (FT) mode (ECO = Vin) for high-speed load response, and Low Power (LP) mode (ECO = GND) for minimal supply current. Its internal reference and error amplifier maintain tight line/load regulation (≤0.20%/V and ≤40 mV respectively) while supporting input voltages from 1.4 V to 6.0 V.

Dropout performance is voltage-dependent: 300 mV at 200 mA for 1.2 V output, optimized by process and layout for stable operation with 1.0 µF–4.7 µF ceramic output capacitors. Ripple rejection exceeds 60 dB at 1 kHz and remains >40 dB up to 100 kHz, enabling clean power delivery in noise-sensitive analog and RF subsystems.

Key Specifications

Pinout & Package

SOT23-5 package (Case 1212-01), 2.8 mm × 2.5 mm footprint, 1.0–1.3 mm height, thermal pad not present - suitable for space-constrained PCB layouts with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1202E/TT and XC6209B122MR-G, the NCP584LSN12T1 uniquely balances ultra-low LP-mode current (3.5 µA), fast transient response (FT mode), and precise 1.2 V output - making it optimal for portable systems requiring both extended battery life and dynamic load handling.

Availability

NCP584LSN12T1 is available at Aetrix Electronics and suitable for handheld medical sensors, wearable fitness monitors, portable barcode scanners, and industrial handheld terminals requiring stable component supply with guaranteed long-term sourcing.

Supply support for NCP584LSN12T1 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 NCP584 series belongs to onsemi's precision low-dropout regulator product line, engineered specifically for battery-powered portable equipment demanding high accuracy, low quiescent current, and robust transient performance under variable load conditions.

FAQ

What output voltage does the NCP584LSN12T1 provide?

The NCP584LSN12T1 provides a fixed 1.2 V output voltage with ±2% accuracy over temperature, line, and load conditions in normal operation. In Low Power (LP) mode, accuracy degrades slightly to ±3%, which remains acceptable for non-critical biasing applications. This fixed-output configuration eliminates external resistor networks and simplifies PCB layout compared to adjustable LDOs.

How does the ECO pin affect NCP584LSN12T1 operation?

The ECO pin on the NCP584LSN12T1 selects between Fast Transient (FT) mode when pulled to Vin and Low Power (LP) mode when grounded. FT mode optimizes load step response and increases supply current to 40 µA, while LP mode reduces supply current to 3.5 µA at the expense of slower transient recovery - enabling adaptive power management without changing hardware connections.

What is the minimum input voltage required for NCP584LSN12T1 to regulate 1.2 V?

The NCP584LSN12T1 requires a minimum input voltage of 1.4 V to initiate regulation, but stable 1.2 V output at 200 mA load demands Vin ≥ 1.5 V due to its 300 mV dropout voltage. Operation below this headroom causes output collapse; for example, at Vin = 1.45 V, maximum sustainable load drops to ~50 mA before dropout occurs.

Can NCP584LSN12T1 replace adjustable LDOs in existing designs?

No - the NCP584LSN12T1 is a fixed 1.2 V output device and cannot substitute for adjustable LDOs without circuit redesign. Its pinout matches standard SOT23-5 LDOs, but removal of feedback resistors and verification of voltage tolerance margins are mandatory. For adjustable replacements, consider onsemi's NCP585 series instead of the NCP584LSN12T1.

What package type is used for NCP584LSN12T1, and what are its key mechanical dimensions?

The NCP584LSN12T1 uses the SOT23-5 package (Case 1212-01), measuring 2.8 mm × 2.5 mm with a maximum height of 1.3 mm. Pin pitch is 0.95 mm (center-to-center), and the lead coplanarity is controlled to ≤0.10 mm - compatible with standard Type II reflow profiles and AOI inspection systems used in high-volume consumer electronics manufacturing.