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

Monolithic Power Systems Inc. MP2303DQ-LF-P

Name: MP2303DQ-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP2303DQ-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2303DQ-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-VFDFN Exposed Pad

Datasheet:: MP2303DQ-LF-P.pdf

Description:: IC REG BUCK ADJ 3A 10QFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,500

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Product details

Overview

MP2303DQ-LF-P from Monolithic Power Systems is a synchronous rectified, current-mode step-down DC/DC converter integrating high- and low-side N-channel MOSFETs. It delivers 3A continuous output current across a 4.75V–28V input range, regulates down to 0.8V with ±3% feedback voltage accuracy, and operates at a fixed 340kHz switching frequency-used in notebook power rails, distributed systems, and pre-regulator stages.

For engineers reviewing the MP2303DQ-LF-P datasheet, MP2303DQ-LF-P pinout, MP2303DQ-LF-P application, or MP2303DQ-LF-P equivalent, key selection criteria include its integrated 125mΩ R_DS(ON) switches, programmable soft-start via SS pin, cycle-by-cycle over-current protection, thermal shutdown at 160°C, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP2303DQ-LF-P employs peak current-mode control with an internal transconductance error amplifier (G_EA = 820μA/V) and current-sense transconductance (G_CS = 9A/V), enabling fast transient response and stable loop compensation via the COMP pin. Its fixed-frequency oscillator maintains 340kHz operation across –40°C to +85°C ambient, with ±10% variation over temperature.

It integrates dual N-MOSFET power switches (125mΩ each), uses a bootstrap capacitor between SW and BS pins for high-side gate drive, and features built-in protections: input UVLO (4.05V rising threshold), EN lockout (2.5V), OVP (0.95V on FB), and thermal shutdown. The device enters 1μA shutdown mode when EN < 1.1V.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	3A continuous - supports mid-power embedded loads without external pass devices.
Input Voltage Range	4.75V to 28V - accommodates 5V, 12V, and 24V industrial/notebook supply rails.
Feedback Voltage	0.800V ±2.5% - sets precise output regulation with standard resistor-divider networks.
Switching Frequency	340kHz fixed - balances efficiency, EMI, and external component size (e.g., 10–15μH inductors).
R_DS(ON) (High/Low)	125mΩ each - minimizes conduction loss at 3A, enabling >90% efficiency at 12V→5V.
Soft-Start Control	Capacitor-programmable via SS pin - prevents inrush current during power-up (t_SS = 0.8V / 6μA × C_SS).
Shutdown Current	1μA max - enables ultra-low quiescent power in battery-backed or standby systems.

Pinout & Package

MP2303DQ-LF-P is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed pad (RoHS-compliant, lead-free). Pin functions are validated per Monolithic Power Systems MP2303 Rev. 1.0 datasheet (p.4).

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Power Input	Primary DC input (4.75–28V); requires local 10μF ceramic bypass to GND for noise suppression.
2 (SW)	Switch Node	Drives external LC filter; connects to boost capacitor (C_BS) for high-side gate drive.
3,4,5 (GND)	Ground Return	Three dedicated ground pins tied internally; must be connected to large PCB copper pour for thermal dissipation.
6 (SS)	Soft-Start Control	Sinks 6μA to GND; capacitor value sets startup ramp time (e.g., 100nF → ~13ms).
7 (BS)	Bootstrap Supply	Accepts charge from SW node via 0.01μF+ capacitor to enable high-side N-MOSFET gate drive above VIN.
8 (EN)	Enable Input	Digital control: >2.7V = active, <1.1V = shutdown; 220mV hysteresis prevents chatter.
9 (COMP)	Loop Compensation	Error amplifier output; requires RC network (e.g., 5.6kΩ + 4.7nF) to stabilize control loop.
10 (FB)	Feedback Input	Senses output voltage divider; reference = 0.8V; OVP triggers at 0.95V (120% of nominal).

Key Features

Feature	Design Value
Integrated Power Switches	Matched 125mΩ high- and low-side N-MOSFETs eliminate external FETs and reduce BOM count.
Current-Mode Control	Enables inherent cycle-by-cycle current limiting and fast load-transient response (<10μs recovery).
Stable with Ceramic Output Caps	Eliminates need for high-ESR electrolytics; supports compact, low-profile 22μF×2 X5R/X7R designs.
Programmable Soft-Start	Prevents input inrush and output overshoot using a single external capacitor (no IC configuration required).
Thermal Protection	Auto-recovery thermal shutdown at 160°C protects against sustained overload or poor heatsinking.

Applications

Industrial Motor Drive I/O Power

Notebook System Rail (3.3V/5V)

Use Scenario: Powers isolated I/O modules, encoder interfaces, and PLC digital inputs requiring clean, regulated 3.3V or 5V from 24V bus.

IC Role / Device Role / Timing Role: Primary buck regulator delivering 3A at 5V with tight line/load regulation (±1.5%) and <50mV output ripple.

Use Value: Eliminates need for discrete MOSFETs and external compensation; achieves >92% efficiency at 24V→5V/2A.

Use Scenario: Generates core system rails (e.g., 3.3V for USB controllers, 5V for display backlight drivers) in space-constrained notebooks.

IC Role / Device Role / Timing Role: Compact, high-efficiency step-down converter operating at 340kHz to avoid AM radio band interference.

Use Value: 3×3mm QFN footprint saves board area; soft-start prevents CPU brown-out during boot sequence.

Distributed Telecom Power (12V Pre-Reg)

Automotive Infotainment Core Supply

Use Scenario: Serves as pre-regulator stage stepping down 48V telecom backplane to 12V intermediate bus for downstream POL converters.

IC Role / Device Role / Timing Role: High-input-voltage buck converter with UVLO (4.05V) and robust 28V absolute max rating.

Use Value: Handles wide input transients; 125mΩ R_DS(ON) limits power loss to <450mW at 2A, reducing thermal stress.

Use Scenario: Supplies 2.5V/3A to infotainment SoCs in automotive head units where input voltage ranges from 6V (cold crank) to 18V (load dump).

IC Role / Device Role / Timing Role: Automotive-grade buck regulator with –40°C to +85°C operation and 160°C thermal shutdown.

Use Value: Maintains regulation during cold-crank dips (down to 4.75V); EN pin allows MCU-controlled power sequencing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2303DN-LF-Z	SOIC-8E package (larger footprint, higher θ_JA = 50°C/W vs. QFN's 50°C/W but lower θ_JC = 10°C/W)	Better suited for prototyping or manual assembly; less optimal for high-density, thermally constrained layouts.	Select when board space permits and thermal margin is >15°C at 3A load.
RT7247BZSP	4A rating, 500kHz switching, different pinout (no BS pin), requires external bootstrap diode	Higher current and frequency, but increased design complexity and reduced layout compatibility.	Choose only if 4A output or faster transient response is mandatory and layout redesign is acceptable.

Compared with MP2303DN-LF-Z, the MP2303DQ-LF-P offers superior thermal performance in compact spaces due to its exposed-pad QFN; versus RT7247BZSP, it provides simpler implementation with integrated bootstrap drive and proven 340kHz EMI profile, trading peak current for design robustness.

Availability

MP2303DQ-LF-P is available at Aetrix Electronics and suitable for industrial motor drives, notebook power subsystems, telecom pre-regulators, and automotive infotainment supplies requiring stable component supply, RoHS compliance, and long-term production continuity.

Supply support for MP2303DQ-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 power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2303 series belongs to MPS's monolithic synchronous buck regulator product line, engineered for high-efficiency, low-noise, and space-constrained DC/DC conversion in computing, industrial, and communications equipment.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2303DQ-LF-P is stable with ≥22μF total ceramic output capacitance (e.g., two 10μF X5R/X7R 0805 caps). Lower values risk instability under transient load steps; ESR should be ≤10mΩ for best ripple suppression and phase margin.

Can the MP2303DQ-LF-P operate with input voltage below 4.75V?

No. The absolute minimum operating input is 4.75V per datasheet specifications. Below this, UVLO disables switching and output drops; the 4.05V rising threshold ensures reliable turn-on only within the rated range.

How is the soft-start time calculated for a given SS capacitor?

Soft-start time t_SS = (0.8V / 6μA) × C_SS. For example, a 100nF capacitor yields t_SS ≈ 13.3ms. This linear ramp prevents inrush current and ensures monotonic V_OUT rise without overshoot.

Is an external bootstrap diode required for all applications?

No. An external Schottky diode (e.g., IN4148) from V_OUT to BS is optional and recommended only when duty cycle exceeds 65% (e.g., 5V output from 7V input), to maintain sufficient gate drive voltage on the high-side switch.

What is the maximum achievable output voltage with the MP2303DQ-LF-P?

The maximum output is 25V, limited by the 31V absolute maximum switch voltage (V_SW) and internal circuitry. At 25V output, input must be ≤28V, and external components (inductor, output cap, diode) must be rated accordingly.

Does the MP2303DQ-LF-P support parallel operation for higher current?

No. The MP2303DQ-LF-P lacks current-sharing or synchronization pins. Parallel operation is not supported and may cause instability or unequal current distribution; use a higher-current part (e.g., MP2451) instead.

How does the COMP pin function in loop compensation?

COMP is the error amplifier output. A series RC network (e.g., 5.6kΩ + 4.7nF) from COMP to GND sets a dominant pole-zero pair to stabilize the current-mode control loop, targeting ~34kHz crossover (1/10 of 340kHz f_SW) for optimal transient response and phase margin.

MP2303DQ-LF-P 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):: 28V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 25V

Current - Output:: 3A

Frequency - Switching:: 340kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

MP2303DQ-LF-P FAQ

1.How can I place an order for MP2303DQ-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2303DQ-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 MP2303DQ-LF-P reliable?

The price and inventory of MP2303DQ-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 MP2303DQ-LF-P is usually 5 days.

3.What payment methods are accepted for MP2303DQ-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2303DQ-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2303DQ-LF-P?

MP2303DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2303DQ-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 MP2303DQ-LF-P?

For technical support, including MP2303DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2303DQ-LF-P requirements.

6.How does Aetrix verify that MP2303DQ-LF-P is sourced from the original manufacturer or authorized distributors?

All MP2303DQ-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 MP2303DQ-LF-P meets industry standards.

7.What is the process for return or replacement of MP2303DQ-LF-P?

All MP2303DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2303DQ-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 MP2303DQ-LF-P part is unused and in its original packaging.

Return procedure for MP2303DQ-LF-P:

1.Submit a request within 90 days.

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

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