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

Monolithic Power Systems Inc. MP2358DQ-LF-Z

Name: MP2358DQ-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP2358DQ-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2358DQ-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-VFDFN Exposed Pad

Datasheet:: MP2358DQ-LF-Z.pdf

Description:: IC REG BUCK ADJ 2A 10QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP2358DQ-LF-Z from Monolithic Power Systems is a monolithic 2A, 370kHz synchronous step-down DC/DC converter in QFN10 (3mm × 3mm) package, featuring an integrated 0.18Ω high-side MOSFET and 10Ω low-side switch, 4.75V–23V input range, adjustable 0.92V–16V output, and cycle-by-cycle over-current protection - deployed in battery chargers and distributed power systems.

For engineers reviewing the MP2358DQ-LF-Z datasheet, MP2358DQ-LF-Z pinout, MP2358DQ-LF-Z application, or MP2358DQ-LF-Z equivalent, key selection criteria include its fixed 370kHz switching frequency, programmable soft-start, 23μA shutdown current, thermal shutdown at 160°C, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP2358DQ-LF-Z implements current-mode control with a transconductance error amplifier (GEA = 550–1150 μA/V) and slope-compensated peak-current sensing, enabling fast transient response and stable loop behavior across wide load and line variations. Its internal oscillator operates at a fixed 370kHz, with foldback to 240kHz under short-circuit conditions via FB voltage detection below 400mV.

It integrates dual MOSFETs (0.18Ω high-side, 10Ω low-side), bootstrap gate drive (BS pin), and precision 0.92V feedback reference (±3% tolerance). The COMP pin serves as both error amplifier output and current comparator input, supporting external RC compensation for stability across diverse output capacitor ESR and capacitance values.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	2A continuous - supports compact point-of-load designs without external current boosting.
Input Voltage Range	4.75V to 23V - enables direct operation from 5V, 12V, or 24V rails in industrial and automotive pre-regulator applications.
Switching Frequency	Fixed 370kHz - balances efficiency, filter size, and EMI performance; folds back to 240kHz during fault conditions.
Feedback Reference	0.92V ±3% - sets output voltage via external resistor divider; enables precise 3.3V, 5V, or custom rail generation.
Shutdown Current	23μA - minimizes system standby power in battery-powered or energy-sensitive applications.
Thermal Shutdown	160°C - protects against sustained overload or poor PCB thermal design without requiring external thermal monitoring.
Internal MOSFET R_DS(on)	0.18Ω (high-side) - reduces conduction loss and improves full-load efficiency up to 93% at 3.3V/2A.

Pinout & Package

MP2358DQ-LF-Z uses a thermally enhanced QFN10 (3mm × 3mm, 0.5mm height) package with exposed thermal pad on underside. Pin 1 is marked by top-side dot; pins are numbered counterclockwise from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1 (NC)	No Connect	Unbonded; must remain floating - no routing or soldering required.
2 (BS)	Bootstrap Supply	Connects external 10nF capacitor between BS and SW to generate gate drive voltage > VIN for high-side MOSFET.
3 (NC)	No Connect	Unbonded; leave unconnected per datasheet layout guidance.
4 (IN)	Input Supply	Accepts 4.75V–23V unregulated input; requires local 10μF ceramic + 0.1μF high-frequency bypass.
5 (SW)	Switch Node	Drives external inductor; carries high di/dt switching current - demands short, low-inductance PCB trace.
6 (GND)	Power Ground	Main return path for switching current; must connect directly to exposed thermal pad and input/output capacitor grounds.
7 (FB)	Feedback Input	Senses output voltage via resistor divider; 0.92V reference enables accurate regulation with <±1% typical output error.
8 (COMP)	Compensation Node	Error amplifier output; connects external RC network (e.g., 10kΩ + 3.9nF) to stabilize control loop.
9 (EN)	Enable / UVLO	Active-high enable with 2.5V threshold and 210mV hysteresis; supports programmable undervoltage lockout via resistor divider.
10 (SS)	Soft-Start	Connects external capacitor (e.g., 10nF) to control ramp rate of output voltage - prevents inrush current and overshoot.

Key Features

Feature	Design Value
Integrated Power Stage	0.18Ω high-side + 10Ω low-side MOSFETs eliminate external switches and reduce BOM count and layout complexity.
Ceramic-Capacitor Compatible	Stable with low-ESR ceramic output capacitors - avoids bulkier tantalum/electrolytic solutions and improves reliability.
Programmable Soft-Start	External SS capacitor sets startup slew rate - prevents input supply sag and output overshoot during power-up.
Fault Protection	Cycle-by-cycle current limiting + thermal shutdown - ensures robust operation under short-circuit, overload, or thermal stress.
Efficiency Optimization	93% peak efficiency at 3.3V/2A (VIN=12V); supports optional external bootstrap diode (e.g., IN4148) for high-duty-cycle operation.

Applications

Battery Charger

Distributed Power System

Use Scenario: Charging Li-ion or lead-acid batteries from 12V or 24V bus in portable medical devices or UPS modules.

IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 4.2V or 14.4V charging voltage with precise current limit and thermal safety.

Use Value: Integrated current limiting and 160°C thermal shutdown prevent cell damage during fault conditions without external monitoring circuitry.

Use Scenario: Intermediate 5V or 3.3V rail generation in multi-rail embedded systems powered from 12V/24V industrial supplies.

IC Role / Device Role / Timing Role: Pre-regulator supplying downstream LDOs or PMICs; fixed 370kHz switching enables predictable EMI filtering.

Use Value: 2A output and 93% efficiency minimize heat rise in dense PCB layouts, reducing need for heatsinking or airflow.

Industrial Sensor Node

Automotive Body Control Module

Use Scenario: Powering low-power microcontrollers, ADCs, and wireless transceivers in remote IoT sensor nodes with 12V supply.

IC Role / Device Role / Timing Role: Main DC/DC converter providing stable 3.3V rail; programmable UVLO ensures clean start-up during cold-cranking events.

Use Value: 23μA shutdown current extends battery life in sleep mode; QFN10 package supports compact, vibration-resistant PCB assembly.

Use Scenario: Regulating 5V supply for microcontrollers and CAN transceivers in non-safety-critical automotive subsystems (e.g., lighting, HVAC).

IC Role / Device Role / Timing Role: Secondary buck converter operating from 12V battery rail; withstands 23V transients and meets AEC-Q200 ambient temp range (–40°C to +85°C).

Use Value: Wide 4.75V–23V input range accommodates automotive load-dump and cold-crank conditions without external protection.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2357DQ-LF-Z	1.5A output, same 370kHz frequency and QFN10 package; lower R_DS(on) (0.15Ω) but reduced current capability.	Suitable for sub-1.5A loads where footprint and pinout compatibility are critical; not recommended for 2A continuous use.	Select when thermal budget is constrained and peak load ≤1.5A - retains identical layout and compensation network.
RT7272BGJ6F	2A, 500kHz, 4.5V–24V input; higher switching frequency enables smaller inductors but increases switching loss at high VIN.	Better suited for space-constrained designs needing minimal inductor volume; less optimal for high-efficiency 12V→3.3V conversion.	Choose for ultra-compact layouts where 500kHz allows <1.0μH inductors; verify thermal performance at full load due to higher f_SW.

Compared with MP2357DQ-LF-Z, the MP2358DQ-LF-Z delivers 33% higher output current in identical QFN10 packaging; versus RT7272BGJ6F, it trades 130kHz lower switching frequency for improved light-load efficiency and simpler EMI filtering.

Availability

MP2358DQ-LF-Z is available at Aetrix Electronics and suitable for battery chargers, distributed power systems, industrial sensor nodes, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2358DQ-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 MP2358 belongs to MPS's high-efficiency, integrated power stage buck converter product line - designed specifically for compact, reliable DC/DC conversion in industrial, computing, and automotive environments where thermal performance and minimal external components are critical.

FAQ

What is the maximum recommended output voltage for MP2358DQ-LF-Z?

The MP2358DQ-LF-Z supports adjustable output voltages from 0.92V to 16V using an external resistor divider on the FB pin. The upper limit is constrained by the absolute maximum rating of the FB pin (–0.3V to +6V) and practical stability limits of the compensation network - 16V is the validated maximum per datasheet test conditions and thermal derating curves.

Can MP2358DQ-LF-Z operate with only ceramic capacitors on input and output?

Yes - the MP2358DQ-LF-Z is explicitly characterized and stabilized for use with low-ESR ceramic capacitors on both input and output. Datasheet Figure 1 and Application Information section confirm stable operation with 10μF X7R ceramic input cap and 22μF ceramic output cap, eliminating need for bulk electrolytics in most designs.

Is the exposed thermal pad on the QFN10 package electrically connected?

No - the exposed thermal pad on MP2358DQ-LF-Z is a thermal-only connection with no internal electrical bond. It must be soldered to a large copper pour tied to GND for optimal thermal performance, but no electrical signal routing or vias to other nets are required or recommended.

Does MP2358DQ-LF-Z support forced PWM or skip-mode operation?

The MP2358DQ-LF-Z operates exclusively in forced continuous conduction mode (CCM) with fixed 370kHz frequency and no built-in pulse-skipping or burst-mode capability. Light-load efficiency is maintained via low quiescent current (1.3mA) and optimized gate drive, not variable-frequency operation.

What is the minimum inductor value recommended for 12V-to-3.3V/2A operation?

For 12V input to 3.3V/2A output, the datasheet recommends a 2.2μH inductor with ≥3A saturation current. This value ensures ~30% peak-to-peak inductor ripple current (≈0.6A), aligning with the 2.8–3.4A current limit and maintaining stable CCM operation across temperature and line variations.

How does the EN pin UVLO function interact with the SS pin during startup?

The EN pin controls global device enablement: when EN voltage rises above 2.50V (typical), the IC exits shutdown and initiates soft-start via the SS pin. SS then ramps the internal reference, controlling output voltage slew rate - EN must remain high throughout startup; dropping below 0.7V during operation forces immediate shutdown regardless of SS state.

Is an external bootstrap diode required for standard operation?

An external bootstrap diode (e.g., IN4148) is optional and only recommended when V_OUT/V_IN > 65% (e.g., 5V output from 7V input) to improve high-duty-cycle efficiency. For typical 12V→3.3V or 12V→5V operation, the internal charge pump suffices - the external diode adds cost and board area without benefit.

MP2358DQ-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 10-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

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):: 0.92V

Voltage - Output (Max):: 16V

Current - Output:: 2A

Frequency - Switching:: 370kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-QFN (3x3)

MP2358DQ-LF-Z FAQ

1.How can I place an order for MP2358DQ-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2358DQ-LF-Z 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 MP2358DQ-LF-Z reliable?

The price and inventory of MP2358DQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2358DQ-LF-Z is usually 5 days.

3.What payment methods are accepted for MP2358DQ-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2358DQ-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2358DQ-LF-Z?

MP2358DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2358DQ-LF-Z 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 MP2358DQ-LF-Z?

For technical support, including MP2358DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2358DQ-LF-Z requirements.

6.How does Aetrix verify that MP2358DQ-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP2358DQ-LF-Z 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 MP2358DQ-LF-Z meets industry standards.

7.What is the process for return or replacement of MP2358DQ-LF-Z?

All MP2358DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2358DQ-LF-Z, 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 MP2358DQ-LF-Z part is unused and in its original packaging.

Return procedure for MP2358DQ-LF-Z:

1.Submit a request within 90 days.

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

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