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

Monolithic Power Systems Inc. MP2355DN-LF

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

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Part No.:: MP2355DN-LF

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: MP2355DN-LF.pdf

Description:: IC REG BUCK ADJ 3A 8SOIC

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Product details

Overview

MP2355DN-LF 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 up to 3A continuous output current across a 4.75V–23V input range, fixed 380kHz switching frequency, and 1.222V feedback reference voltage-used as a primary power stage in distributed power systems and battery charger pre-regulators.

For engineers reviewing the MP2355DN-LF datasheet, MP2355DN-LF pinout, MP2355DN-LF application, or MP2355DN-LF equivalent, this device supports fast transient response via current-mode control, includes cycle-by-cycle overcurrent protection and thermal shutdown, and enables adjustable soft-start via external capacitor on SS pin for controlled inrush management.

Technical Context

The MP2355DN-LF implements peak-current-mode control with internal slope compensation, using an error amplifier (transconductance G_EA = 800μA/V, gain A_VEA = 400V/V) and current-sense transconductance G_CS = 3.8A/V to regulate output voltage via FB pin at 1.222V. Its oscillator operates at 380kHz ±13% with frequency foldback under short-circuit conditions (20–50kHz).

It integrates dual N-channel MOSFETs (R_DS(ON)₁ = 95mΩ, R_DS(ON)₂ = 10Ω), bootstrap gate drive (BST pin), and UVLO on RUN pin (2.37–2.71V enable threshold with 210mV hysteresis), supporting automatic startup when RUN is tied to VIN and stable operation down to 0% duty cycle.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.75V to 23V - supports wide-input industrial and automotive battery-fed rails without external pre-regulation.
Output Current	3A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or multi-rail PMIC inputs.
Switching Frequency	380kHz (±13%) - balances EMI performance and inductor size; enables use of compact 10–22μH shielded ferrite inductors.
Feedback Reference	1.222V - sets precise output voltage via resistive divider; enables 2.5V, 3.3V, 5V, or 12V outputs with <±1% regulation accuracy.
Shutdown Current	20μA - minimizes standby power loss in battery-backed systems during deep sleep modes.
Thermal Shutdown	150°C - protects against sustained overload or poor PCB thermal design; auto-recovery after cooldown.
Current Limit	3.7A to 4.3A - provides robust short-circuit and overload protection while maintaining >3A delivery under nominal conditions.

Pinout & Package

MP2355DN-LF uses SOIC-8N package with exposed thermal pad (2.79mm × 3.81mm), rated for –40°C to +85°C ambient operation. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1 SS	Soft-Start Control Input	Connects external capacitor (e.g., 0.1μF) to GND to set 10ms soft-start ramp; open for immediate startup.
2 BST	Bootstrap Supply Input	Drives high-side MOSFET gate via 10nF capacitor to LX; requires ceramic capacitor ≥10nF for reliable bootstrapping.
3 VIN	Main Power Input	Accepts 4.75–23V input; requires local 10μF ceramic bypass capacitor near pin to suppress switching noise.
4 LX	Power Switch Node	Swings between VIN and GND; connects to inductor and BST capacitor; critical for EMI layout and thermal path.
5 GND	Ground Reference & Thermal Pad	Primary signal and power return; exposed pad underneath package must be connected to large copper pour for heat dissipation.
6 FB	Voltage Feedback Input	Senses output via resistor divider; regulated to 1.222V; high-impedance node requiring short trace routing.
7 COMP	Loop Compensation Node	Connects RC network (e.g., 4.7kΩ + 4.7nF) to GND to stabilize control loop; determines phase margin and transient response.
8 RUN	Enable / UVLO Input	Enables regulator above 2.71V; shuts down below 0.9V; internal 1.8μA pull-up allows direct connection to VIN for always-on operation.

Key Features

Feature	Design Value
Integrated Power Stage	95mΩ high-side + 10Ω low-side MOSFETs eliminate external switch selection and reduce BOM count by 4 components.
Ceramic-Capacitor Stable	Compensated for low-ESR ceramic output capacitors (e.g., 22μF X5R/X7R), enabling smaller footprint and lower ripple vs. tantalum.
Programmable Soft-Start	SS pin accepts 0.01–0.1μF capacitor to scale soft-start time from 1ms to 100ms, preventing input rail collapse during cold start.
Current-Mode Control	Provides inherent cycle-by-cycle current limiting, fast load transient response (<50μs recovery), and simplified loop compensation.
UVLO with Hysteresis	RUN pin UVLO (2.37V rise / 2.16V fall) prevents oscillatory startup near input undervoltage thresholds in noisy environments.

Applications

Distributed Power System

Battery Charger Pre-Regulator

Use Scenario: Point-of-load conversion in telecom line cards where 12V or 24V backplane supplies multiple isolated 3.3V/5V rails.

IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 3A at 3.3V with tight line/load regulation and fast transient immunity.

Use Value: Eliminates need for external MOSFET drivers and sense resistors; achieves >92% efficiency at 2A load with 15μH inductor and 22μF ceramic output cap.

Use Scenario: Pre-regulating 18V–23V Li-ion battery pack voltage to 5V before linear charging IC (e.g., TP4056) or USB-PD sink.

IC Role / Device Role / Timing Role: High-efficiency intermediate stage reducing thermal stress on downstream linear regulators and improving charge efficiency.

Use Value: Maintains >90% efficiency across 4.75–23V input range; soft-start prevents inrush into battery protection circuitry during plug-in events.

Industrial PLC I/O Module

FPGA Core Power Supply

Use Scenario: Powering 24V-tolerant digital I/O buffers and isolation drivers in programmable logic controller modules.

IC Role / Device Role / Timing Role: Robust 5V/3A supply with thermal shutdown and overcurrent protection for field-side interface circuits.

Use Value: Withstands 23V transients per IEC 61000-4-4; 150°C thermal shutdown prevents latch-up during shorted output faults.

Use Scenario: Generating 1.2V core voltage for Xilinx Artix-7 or Intel Cyclone V FPGA with dynamic current demand up to 3A.

IC Role / Device Role / Timing Role: Fast-response buck converter with current-mode control to maintain <±3% regulation during 2A/μs load steps.

Use Value: COMP pin compensation enables <50μs load transient recovery; 380kHz switching avoids interference with FPGA clock domains.

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	Same SOIC-8N package but 500kHz switching frequency, 2.5A rating, and 1.215V feedback reference.	Better suited for space-constrained designs needing higher frequency and lower output ripple, but reduced current capability.	Select when board area is limited and 2.5A suffices; requires re-optimization of LC filter and compensation network.
LM2678SD-3.3/NOPB	TO-263-5 package, 5A rating, 260kHz fixed frequency, external MOSFET required, no integrated low-side switch.	Higher current and thermal robustness for high-temperature environments, but larger footprint and higher external component count.	Choose for >3A loads or ambient >85°C; requires external diode and gate driver, increasing design complexity and cost.

Compared with MP2355DN-LF, MP2357DN-LF trades current capacity for higher switching frequency and tighter feedback tolerance, while LM2678SD-3.3/NOPB offers higher current headroom and thermal resilience at the expense of integration level and PCB area.

Availability

MP2355DN-LF is available at Aetrix Electronics and suitable for distributed power systems, battery charger pre-regulators, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2355DN-LF 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 buck converter product line, designed specifically for space- and thermally constrained industrial and portable power systems requiring minimal external components and robust fault protection.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2355DN-LF is stable with ≥22μF ceramic output capacitance (X5R/X7R) and low ESR (<10mΩ). Using 22μF Murata GRM series capacitors with proper PCB layout ensures <20mV peak-to-peak ripple at 3A load and maintains phase margin >45° across temperature and line variations.

Can MP2355DN-LF operate with 5V input?

Yes - the 4.75V minimum input rating allows reliable operation from standard 5V rails. At 5V input, maximum output voltage is limited to ~4.5V due to dropout constraints; for 5V output, minimum input must be ≥5.5V to ensure sufficient headroom for R_DS(ON) losses and duty cycle margin.

How is thermal performance affected by the exposed pad connection?

The exposed pad on the SOIC-8N package must be soldered to a ≥10.7mm² copper pour connected to GND. Without this, θ_JA degrades from 50°C/W to >80°C/W, causing junction temperature to exceed 150°C at 2.5A load - triggering thermal shutdown and intermittent operation.

What happens if the BST capacitor is omitted or undersized?

Omitting or undersizing the BST capacitor (e.g., <10nF) causes insufficient gate drive voltage for the high-side MOSFET, resulting in excessive conduction loss, elevated LX node ringing, reduced efficiency (<75%), and potential thermal failure under full load due to prolonged switching transitions.

Is an external bootstrap diode required for all applications?

An external bootstrap diode (e.g., BAT54) is recommended only for high-duty-cycle operation (V_OUT/V_IN > 65%), fixed 5V input systems, or V_OUT > 12V outputs - where internal charge pump may not fully replenish BST voltage. It is not required for typical 12V→3.3V or 24V→5V configurations.

How does the RUN pin behave during input brownout?

The RUN pin features 210mV hysteresis: it disables the regulator when voltage falls below 2.37V (rising threshold) and remains off until voltage rises above 2.54V, preventing chatter during marginal input conditions. Internal 1.8μA pull-up allows direct tie-to-VIN for always-on use without external bias.

What is the impact of omitting the SS capacitor?

Leaving SS pin unconnected disables soft-start, causing immediate full-duty-cycle startup. This results in high inrush current (>6A peak), potentially tripping upstream current limiters or causing input voltage sag - especially with small input capacitors or high-impedance sources like long cables or battery packs.

MP2355DN-LF Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

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

Packaging:: Tube

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 (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC-EP

MP2355DN-LF FAQ

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

Please submit a Request for Quotation (RFQ) for MP2355DN-LF 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 reliable?

The price and inventory of MP2355DN-LF 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 is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2355DN-LF?

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

Once your MP2355DN-LF 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?

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

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

All MP2355DN-LF 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 meets industry standards.

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

All MP2355DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2355DN-LF, 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 part is unused and in its original packaging.

Return procedure for MP2355DN-LF:

1.Submit a request within 90 days.

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

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