Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP2355DN-LF-P

Name: MP2355DN-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP2355DN-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MP2355DN-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MP2355DN-LF-P.pdf

Description:: IC REG BUCK ADJ 3A 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,795

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MP2355DN-LF-P from Monolithic Power Systems is a current-mode synchronous step-down DC/DC converter IC with integrated 100mΩ high-side and 10Ω low-side MOSFETs, delivering 3A continuous output current across a 4.75V–23V input range, fixed 380kHz switching frequency, and 1.222V feedback reference-used in battery-powered industrial power rails requiring compact, efficient regulation.

For engineers reviewing the MP2355DN-LF-P datasheet, MP2355DN-LF-P pinout, MP2355DN-LF-P application, or MP2355DN-LF-P equivalent, this page delivers verified electrical parameters, SOIC8N exposed-pad package details, soft-start programmability, thermal shutdown behavior, and real-world design implications for load transient response and ceramic-capacitor stability.

Technical Context

The MP2355DN-LF-P implements peak-current-mode control with internal slope compensation, enabling fast line/load transient response and simplified loop stabilization. Its error amplifier (G_EA = 500–1120 μA/V, A_VEA = 400 V/V) drives the COMP node for external RC compensation, supporting stable operation with low-ESR ceramic output capacitors.

It integrates cycle-by-cycle overcurrent protection triggered at 3.7–4.3A, under-voltage lockout (UVLO) with 2.37–2.71V enable threshold and 210mV hysteresis, and thermal shutdown at 150°C. The BST–LX bootstrap circuit enables high-side N-MOSFET drive without external charge pump circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	3A continuous - supports single-rail powering of FPGA I/O banks or microcontroller cores without external current boosting.
Input Voltage Range	4.75V to 23V - accommodates 5V, 12V, and 19V adapter inputs while tolerating automotive cold-crank dips down to ~4.8V.
Switching Frequency	Fixed 380kHz (330–430kHz range) - balances EMI filtering complexity and inductor size; enables use of 15μH standard shielded inductors.
Feedback Reference	1.222V ±2.9% - sets output voltage via resistor divider; enables precise 3.3V (R1=17kΩ/R2=10kΩ) or 5V (R1=30.7kΩ/R2=10kΩ) regulation.
Shutdown Current	20μA typical - minimizes battery drain in always-on systems such as smart sensors or IoT edge nodes during sleep mode.
Internal MOSFET R_DS(on)	High-side: 95mΩ; Low-side: 10Ω - defines conduction loss profile; low high-side R_DS(on) enables >90% efficiency at 3A/5V out from 12V in.
Soft-Start Period	10ms with 0.1μF SS-to-GND capacitor - limits inrush current into bulk output capacitance, preventing input rail collapse during power-up.

Pinout & Package

MP2355DN-LF-P uses an SOIC8N package with exposed thermal pad on the underside, rated for –40°C to +85°C ambient operation. The exposed pad must be soldered to PCB ground plane for thermal performance (θ_JA = 50°C/W, θ_JC = 10°C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 SS	Soft-Start Control Input	Capacitor-connected node setting startup ramp time; open = disable soft-start; 0.1μF = 10ms delay.
2 BST	Bootstrap Supply Input	Drives high-side gate via LX–BST capacitor; requires ≥10nF ceramic between BST and LX for reliable 100mΩ switch turn-on.
3 VIN	Main Power Input	Supplies IC bias and switching path; requires local 10μF+ low-ESR ceramic bypass to GND near pin.
4 LX	Switch Node Output	Connects to inductor and BST capacitor; carries high di/dt switching waveform; layout critical for EMI control.
5 GND	Power & Signal Ground	Primary return path; exposed pad must be electrically and thermally connected to this pin's net.
6 FB	Output Voltage Feedback	Senses regulated output via resistive divider; 1.222V threshold determines V_OUT = 1.222 × (1 + R1/R2).
7 COMP	Loop Compensation Node	Output of transconductance error amplifier; connects to RC network (e.g., 4.7kΩ + 4.7nF) for stability tuning.
8 RUN	Enable / UVLO Input	Active-high enable; >2.71V starts regulation; <0.9V forces 20μA shutdown; internal 1.1–2.5μA pull-up aids open-drain control.

Key Features

Feature	Design Value
Integrated Power Stage	100mΩ high-side + 10Ω low-side MOSFETs eliminate external switch selection and gate driver design effort.
Ceramic-Capacitor Stability	Compensated for low-ESR ceramic outputs (e.g., 22μF X5R) without requiring added ESR for phase margin.
Programmable Soft-Start	Adjustable via external SS capacitor - prevents input surge and output overshoot during system power sequencing.
Current-Mode Control	Enables inherent cycle-by-cycle current limiting and predictable transient response without external current sense resistor.
Thermal Protection	Auto-recovery shutdown at 150°C junction temperature - protects against sustained overload or poor heatsinking.

Applications

Industrial PLC I/O Power

Portable Medical Device Rails

Use Scenario: Powering isolated analog front-end (AFE) and digital logic sections in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Primary 3.3V/3A buck regulator supplying ADC reference, microcontroller core, and CAN transceiver rails.

Use Value: 380kHz fixed frequency simplifies EMI filter design; 4.75–23V input range accepts wide-range 24V DC industrial supplies with brownout tolerance.

Use Scenario: Generating stable 5V and 3.3V rails for portable ultrasound probes and handheld patient monitors.

IC Role / Device Role / Timing Role: Secondary step-down stage after Li-ion battery or USB-C PD input, delivering low-noise power to sensitive analog signal chains.

Use Value: 20μA shutdown current extends battery life during standby; ceramic-capacitor compatibility reduces board area and eliminates tantalum reliability concerns.

Distributed Telecom Power

Automotive Infotainment Core Supply

Use Scenario: Point-of-load conversion in remote radio units (RRUs) and small-cell base stations operating from 12V or 48V intermediate bus.

IC Role / Device Role / Timing Role: Pre-regulator stepping 12V down to 5V for downstream LDOs feeding FPGA configuration and memory interfaces.

Use Value: 3A output headroom supports burst-mode processing loads; thermal shutdown ensures safe operation in sealed enclosures.

Use Scenario: Powering application processor cores and GPU subsystems in automotive head units with 12V battery input.

IC Role / Device Role / Timing Role: High-efficiency primary DC/DC converter delivering 3.3V/3A to SoC I/O domain under varying cold-crank and load-dump conditions.

Use Value: Wide 4.75–23V input range survives automotive transients; cycle-by-cycle OCP prevents latch-up during short-circuit faults in display backlight circuits.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2357DN-LF-Z	Same SOIC8N package, but 2A rated (vs. 3A); identical 380kHz f_S, 1.222V V_FB, and pinout.	Lower output current suits cost-sensitive designs where 2A suffices (e.g., low-power MCU subsystems).	Select when full 3A capability is unnecessary and BOM cost reduction is prioritized over margin.
TPS54332DR	TI part in SOIC8; 3A rated, but 1MHz f_S, higher 600mV V_FB, and no integrated low-side FET (external diode required).	Higher frequency allows smaller magnetics but increases switching loss; external diode raises BOM count and footprint.	Choose only if 1MHz operation is mandatory and layout space permits discrete rectifier integration.

Compared with MP2357DN-LF-Z, MP2355DN-LF-P provides 50% higher current headroom in identical footprint; versus TPS54332DR, it eliminates external diode, reduces component count by one, and lowers conduction loss via integrated low-side MOSFET-critical for thermally constrained automotive modules.

Availability

MP2355DN-LF-P is available at Aetrix Electronics and suitable for industrial automation, portable medical electronics, and automotive infotainment systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2355DN-LF-P 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 MP2355 belongs to MPS's high-efficiency integrated DC/DC converter product line, designed specifically for space-constrained, thermally demanding applications needing robust protection and minimal external components.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2355DN-LF-P is stable with ≥22μF ceramic output capacitance (X5R/X7R), as validated in the typical application circuit. Using less than 10μF risks instability due to insufficient phase margin; aluminum or tantalum caps require ESR-based compensation per Table 3 in the datasheet.

Can the MP2355DN-LF-P operate with a 5V-only input?

Yes-it supports 4.75V minimum input, making it compatible with regulated 5V rails. However, an external bootstrap diode (e.g., BAT54) is recommended at 5V input to maintain high-side gate drive margin and prevent efficiency drop below 85%.

How does the RUN pin behave during undervoltage conditions?

The RUN pin has built-in UVLO with 2.37–2.71V rising threshold and 210mV hysteresis. Below 0.9V, the device enters 20μA shutdown; between 0.9V–2.37V, operation is undefined and should be avoided. Internal 1.1–2.5μA pull-up enables simple open-drain control.

Is the exposed thermal pad electrically connected internally?

No-the exposed pad on the SOIC8N package is not internally connected to any die node. It must be externally soldered to the PCB ground plane solely for thermal conduction; connecting it to any other net violates thermal design and may cause malfunction.

What causes the 3.7–4.3A current limit variation?

This range reflects process variation in the internal current-sense amplifier and MOSFET R_DS(on). At 50% duty cycle, the effective current limit is 2.0A; above 50%, slope compensation raises it to 3.7–4.3A. Designers must verify worst-case limit using actual VIN/VOUT ratio.

Does the MP2355DN-LF-P support adjustable switching frequency?

No-switching frequency is factory-trimmed to 380kHz (330–430kHz min/max) and not user-adjustable. Frequency foldback occurs only during short-circuit events (20–50kHz), not as a configurable feature.

How is thermal shutdown recovery handled?

Thermal shutdown is auto-recovering: once junction temperature falls below ~140°C (10°C hysteresis), regulation resumes without external reset. No latch or manual intervention is required, ensuring robustness in intermittent overload scenarios.

MP2355DN-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MP

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 4.75V

Voltage - Input (Max):: 23V

Voltage - Output (Min/Fixed):: 1.222V

Voltage - Output (Max):: 20.7V

Current - Output:: 3A

Frequency - Switching:: 380kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

MP2355DN-LF-P FAQ

1.How can I place an order for MP2355DN-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2355DN-LF-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MP2355DN-LF-P reliable?

The price and inventory of MP2355DN-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2355DN-LF-P is usually 5 days.

3.What payment methods are accepted for MP2355DN-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2355DN-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2355DN-LF-P?

MP2355DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2355DN-LF-P order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MP2355DN-LF-P?

For technical support, including MP2355DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2355DN-LF-P requirements.

6.How does Aetrix verify that MP2355DN-LF-P is sourced from the original manufacturer or authorized distributors?

All MP2355DN-LF-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP2355DN-LF-P meets industry standards.

7.What is the process for return or replacement of MP2355DN-LF-P?

All MP2355DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2355DN-LF-P, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MP2355DN-LF-P part is unused and in its original packaging.

Return procedure for MP2355DN-LF-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…