onsemi NCP4626DMX033TCG

Overview

NCP4626DMX033TCG from onsemi is a 3.3 V, 300 mA CMOS low dropout linear regulator with reverse current protection, ECO mode selector (fast/low-power), ±2.5% output accuracy in low-power mode, 700 mV typical dropout at 300 mA, and stable operation with 2.2 µF input / 4.7 µF output ceramic capacitors. It serves as a primary power rail regulator in battery backup circuits where VOUT may exceed VIN.

For engineers reviewing the NCP4626DMX033TCG datasheet, pinout, applications, or equivalent options, key selection criteria include reverse-current blocking capability, dual-mode quiescent current (6 µA vs. 15 µA), thermal shutdown (150°C), and XDFN6 package compatibility with high-density PCB layouts.

Technical Context

The NCP4626DMX033TCG integrates a reverse-current detector, fold-back current limiting, and thermal shutdown circuitry. Its ECO pin selects between fast mode (lower dropout, better transient response) and low-power mode (6 µA IQ), enabling dynamic trade-offs between efficiency and performance in portable systems.

It features internal N-channel pass transistor with 150 mΩ typical R_DS(on) (D-version only), supports input voltages from 3.5 V to 16 V, tolerates up to 18 V absolute max, and includes auto-discharge functionality via an internal VOUT-to-GND switch activated during disable.

Key Specifications

Pinout & Package

Package: 1.6 mm × 1.6 mm, 0.5 mm pitch XDFN6 (Case 711AC), thermally enhanced with exposed GND pad (internally connected to Pin 5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3302E/MB and TLD1113-33-1, the NCP4626DMX033TCG uniquely combines reverse-current blocking, dual-mode IQ control, and auto-discharge - making it the only choice for battery-backed systems requiring both ultra-low standby current and safe VOUT>VIN operation.

Availability

NCP4626DMX033TCG is available at Aetrix Electronics and suitable for digital home appliances, audio visual equipment, and battery backup circuits requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for NCP4626DMX033TCG 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 NCP4626 series belongs to onsemi's precision analog LDO portfolio, designed specifically for space-constrained, battery-sensitive systems requiring reverse-current immunity and adaptive power modes.

FAQ

What is the maximum input voltage rating for the NCP4626DMX033TCG?

The NCP4626DMX033TCG has an absolute maximum input voltage rating of 18 V. Its recommended operating input range is 3.5 V to 16 V. Exceeding 18 V risks permanent damage. This rating allows safe operation in 12 V automotive or industrial bus environments with transient spikes, provided external clamping is used for sustained overvoltage events. The NCP4626DMX033TCG maintains regulation and protection functions within its specified range.

Does the NCP4626DMX033TCG provide reverse current protection, and how does it work?

Yes, the NCP4626DMX033TCG provides active reverse current protection. When VOUT exceeds VIN (e.g., during battery backup), an internal detector disables the pass element, limiting reverse current to ≤0.1 µA. This eliminates the need for an external blocking diode and prevents battery drain or upstream supply contamination. The feature is inherent to the IC's architecture and requires no external components. The NCP4626DMX033TCG implements this across its full operating temperature range (−40°C to +85°C).

What is the purpose of the ECO pin on the NCP4626DMX033TCG, and what are the trade-offs between modes?

The ECO pin on the NCP4626DMX033TCG selects between two operational modes: logic-high enables fast mode (lower dropout, better transient response), and logic-low enables low-power mode (6 µA typical IQ). Fast mode achieves 550 mV dropout at 300 mA but draws 15 µA IQ; low-power mode increases dropout to 700 mV but cuts IQ by 60%. The NCP4626DMX033TCG allows system firmware to dynamically optimize for battery life or performance based on real-time load conditions.

Is the NCP4626DMX033TCG compatible with standard 2.2 µF input and 4.7 µF output ceramic capacitors?

Yes, the NCP4626DMX033TCG is explicitly characterized and guaranteed stable with a 2.2 µF ceramic input capacitor and a 4.7 µF ceramic output capacitor. These values meet all stability, line transient, and load transient requirements across temperature and load conditions. Larger capacitance or lower-ESR ceramics further improve performance but are not required. The NCP4626DMX033TCG's internal compensation eliminates the need for external RC networks or tantalum capacitors.

What package type and dimensions does the NCP4626DMX033TCG use, and is thermal pad connection mandatory?

The NCP4626DMX033TCG uses the XDFN6 package (Case 711AC): 1.6 mm × 1.6 mm, 0.5 mm pitch, with an exposed thermal pad on the bottom. While the datasheet states that connecting the pad to PCB GND is "best practice," it also confirms that leaving it unconnected is acceptable. However, for thermal performance above 150 mW dissipation, connection to a thermal plane is strongly recommended - the NCP4626DMX033TCG's R_JA drops from 156°C/W (no pad connection) to ≤60°C/W (with 200 mm² copper pour), preventing thermal shutdown under full load.