Monolithic Power Systems Inc. MP2363DN-LF-Z

Overview

MP2363DN-LF-Z from Monolithic Power Systems is a non-synchronous step-down DC-DC converter IC with integrated 100mΩ high-side N-channel MOSFET, delivering 3A continuous output current across 4.75V–27V input range and adjustable 0.92V–21V output voltage at fixed 365kHz switching frequency. It features cycle-by-cycle over-current protection, thermal shutdown, programmable soft-start, and operates down to 20µA quiescent current in shutdown mode-used in battery chargers and distributed power systems.

For engineers reviewing the MP2363DN-LF-Z datasheet, MP2363DN-LF-Z pinout, MP2363DN-LF-Z application, or MP2363DN-LF-Z equivalent, key selection criteria include input voltage range (4.75–27V), output adjustability (0.92–21V), SOIC8N package with exposed pad, 3A load capability, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP2363DN-LF-Z employs peak current-mode control architecture with internal transconductance error amplifier (800µA/V) and slope compensation, enabling fast transient response and simplified loop stabilization. Its functional block includes integrated high-side switch, bootstrap charge circuit (BS–SW capacitor), and precision 0.92V feedback reference.

It uses an internal 5V regulator to charge the bootstrap capacitor during SW low phase via a dedicated 10Ω pull-down switch, ensuring reliable gate drive for the high-side MOSFET across wide duty cycles. Under-voltage lockout (2.54V threshold with 210mV hysteresis) and thermal shutdown (160°C) provide robust fault protection.

Key Specifications

Pinout & Package

MP2363DN-LF-Z is packaged in SOIC8N (8-pin small-outline integrated circuit with exposed thermal pad), JEDEC MS-012 BA variant, with 1.27mm pitch and backside thermal pad electrically connected to Pin 4 (GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with MP2363DN-LF-Z, MP2338DJ-LF-Z offers superior thermal and efficiency specs in a smaller QFN package but requires layout revision, while LM2678-5.0/NOPB provides higher current at fixed 5V but sacrifices flexibility, size, and modern protection features.

Availability

MP2363DN-LF-Z is available at Aetrix Electronics and suitable for battery chargers, distributed power rails, pre-regulator stages, and automotive accessory power supplies requiring stable component supply and long-term industrial availability.

Supply support for MP2363DN-LF-Z 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, motion control, and automotive applications.

The MP2363 belongs to MPS's mainstream non-synchronous buck converter product line, designed for cost-sensitive, medium-power industrial and consumer applications requiring high integration and proven reliability in SOIC8N packaging.

FAQ

What is the maximum recommended output current for MP2363DN-LF-Z in SOIC8N package?

The MP2363DN-LF-Z delivers 3A continuous output current under typical PCB thermal conditions (1"² 1oz copper). Derating is required above +70°C ambient or with insufficient copper area; thermal resistance θ_JA is 50°C/W for SOIC8N, so junction temperature must remain below 150°C.

Can MP2363DN-LF-Z operate with input voltage below 4.75V?

No. The absolute minimum operating input voltage is 4.75V per datasheet specifications. Below this, UVLO prevents startup, and internal regulation fails. The device will not function at 3.3V or 4.5V inputs-even briefly-due to hard UVLO threshold at 2.54V (rising) referenced to internal bandgap.

Is an external bootstrap diode required for MP2363DN-LF-Z?

An external bootstrap diode (e.g., 1N4148) is optional and recommended only for high-duty-cycle applications (V_OUT/V_IN > 65%, e.g., 5V out from 7V in) to improve efficiency by reducing BST capacitor discharge losses. It is not required for standard 12V→3.3V or 24V→5V configurations.

What is the purpose of the exposed thermal pad on the SOIC8N package?

The exposed pad on the MP2363DN-LF-Z SOIC8N package is electrically connected to Pin 4 (GND) and serves as the primary thermal path. It must be soldered to a PCB copper pour tied to system ground to achieve specified θ_JA = 50°C/W and prevent thermal shutdown under full 3A load.

How does the MP2363DN-LF-Z handle short-circuit conditions?

During output short-circuit, the MP2363DN-LF-Z enters cycle-by-cycle current limiting, clamping peak switch current to 4.5–5.7A. If sustained, thermal shutdown activates at 160°C. Recovery is automatic after fault removal and die cooling-no latch-off or manual reset required.

Why is the MP2363 marked "Not Recommended for New Designs"?

MPS explicitly states "NOT RECOMMENDED FOR NEW DESIGNS" in the datasheet because the MP2338 is its designated pin-compatible, performance-enhanced successor (lower R_DS(ON), higher efficiency, QFN package). MP2363 remains fully supported for existing designs and legacy production, but MP2338 is preferred for new projects.

What capacitor value is needed for 10ms soft-start time?

A 222nF (0.22µF) capacitor on the SS pin yields ~10ms soft-start time, calculated using t_SS ≈ 45 × C_SS (in µF). For precise timing, use a 0.22µF ±10% X7R ceramic capacitor placed close to the SS pin with short traces to GND.