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

Monolithic Power Systems Inc. MP2303DN-LF-P

Name: MP2303DN-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP2303DN-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2303DN-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: MP2303DN-LF-P.pdf

Description:: IC REG BUCK ADJ 3A 8SOICE

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Product details

Overview

MP2303DN-LF-P from Monolithic Power Systems is a monolithic synchronous buck regulator integrating high- and low-side N-channel MOSFETs, delivering 3A continuous output current across 4.75V–28V input range with fixed 340kHz switching frequency and 0.8V feedback reference. It supports adjustable output from 0.8V to 25V, features cycle-by-cycle over-current protection, programmable soft-start, and operates from –40°C to +85°C in SOIC8E (exposed pad) package - used as primary DC/DC converter in notebook power rails.

For engineers reviewing the MP2303DN-LF-P datasheet, MP2303DN-LF-P pinout, MP2303DN-LF-P application, or MP2303DN-LF-P equivalent, key selection criteria include input voltage range compatibility, integrated MOSFET R_DS(ON) (125mΩ each), thermal performance in SOIC8E (θ_JA = 50°C/W), soft-start capacitor sizing, and FB divider design for target V_OUT.

Technical Context

The MP2303DN-LF-P implements current-mode control with internal transconductance error amplifier (G_EA = 550–1100μA/V) and COMP pin-based loop compensation. Its functional block includes integrated 5V LDO for gate drive, UVLO (3.8–4.3V rising threshold), EN lockout (2.2–2.7V), and OVP (0.9–1.0V at FB). The boost capacitor (SW-to-BS) enables high-side gate drive above VIN.

It uses fixed-frequency (340kHz typ.) oscillator with ±13% variation over temperature, supports ceramic output capacitors via stability optimization, and integrates thermal shutdown at 160°C. The device achieves up to 95% efficiency at 12V_IN/5V_OUT/3A due to synchronous rectification and low R_DS(ON) switches.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	3A continuous - supports full-load operation without external current-sense resistor or heatsink in typical PCB layouts.
Input Voltage Range	4.75V to 28V - accommodates 5V, 12V, and 24V industrial/notebook supply rails without pre-regulation.
Feedback Reference	0.800V ±2.5% - sets precise output regulation; enables 3.3V output using 10kΩ/31.3kΩ divider (R2/R1).
Switching Frequency	340kHz fixed - balances EMI, inductor size, and efficiency; stable across –40°C to +85°C ambient.
R_DS(ON) (HS & LS)	125mΩ each - minimizes conduction loss; contributes to >90% efficiency at 2A load with 12V_IN/5V_OUT.
Shutdown Current	≤3.0μA - enables ultra-low-power standby in battery-backed systems or always-on subsystems.
Thermal Shutdown	160°C - protects die during overload or poor thermal design; auto-recovery after cooldown.

Pinout & Package

MP2303DN-LF-P uses SOIC8E (exposed pad) package: 8-pin surface-mount with thermal pad on underside for enhanced heat dissipation (θ_JA = 50°C/W, θ_JC = 10°C/W). Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.

Pin	Circuit Role	Design Meaning
1 (BS)	Bootstrap Supply Input	Connects 0.01μF+ capacitor from SW to BS to generate gate drive voltage >VIN for high-side MOSFET.
2 (IN)	Main Power Input	Accepts 4.75–28V; requires local 10μF+ low-ESR ceramic bypass capacitor to suppress switching noise.
3 (SW)	Switch Node Output	Drives external LC filter; connects to inductor and bootstrap capacitor; carries high di/dt current.
4 (GND)	Power Ground	Primary return path; exposed pad must be connected to GND plane for thermal and noise performance.
5 (FB)	Voltage Feedback Input	Senses output via resistive divider; 0.8V reference enables accurate regulation down to 0.8V output.
6 (COMP)	Loop Compensation Node	Connects RC network (e.g., 5.6kΩ + 4.7nF) to stabilize control loop; determines phase margin and transient response.
7 (EN)	Enable Control Input	Digital ON/OFF control: >2.7V = active, <1.1V = shutdown; 220mV hysteresis prevents chatter near threshold.
8 (SS)	Soft-Start Timing Input	Capacitor to GND sets startup ramp time (t_SS ≈ C_SS × 6μA / 0.8V); prevents inrush into bulk capacitance.

Key Features

Feature	Design Value
Synchronous rectification	Integrated 125mΩ HS/LS MOSFETs eliminate external diode losses, enabling >95% peak efficiency.
Current-mode control	Provides inherent cycle-by-cycle current limiting and fast transient response (<10μs recovery from 1A load step).
Programmable soft-start	SS pin allows user-defined startup ramp (e.g., 100nF → ~75ms) to prevent input rail collapse during power-up.
UVLO with hysteresis	3.8–4.3V rising/falling thresholds ensure clean start-up and brown-out immunity in noisy 5V/12V systems.
Stable with ceramic output caps	Optimized loop compensation works with low-ESR ceramic capacitors (X5R/X7R), reducing BOM count and footprint.

Applications

Industrial PLC I/O Power

Notebook Core Voltage Rail

Use Scenario: Powers isolated digital I/O modules in programmable logic controllers requiring stable 3.3V/2A from 24V field bus.

IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V to 3.3V; provides regulated supply for microcontrollers, level shifters, and optocouplers.

Use Value: Integrated MOSFETs and UVLO enable direct connection to unregulated 24V bus; 340kHz switching avoids AM radio band interference.

Use Scenario: Generates 1.8V core voltage for Intel Atom processors in compact notebooks with limited board space.

IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 5V intermediate rail; delivers 3A with tight load regulation.

Use Value: 0.8V feedback reference and 3A capability support low-V_OUT designs; SOIC8E package simplifies layout vs. QFN in dense layouts.

Medical Point-of-Care Display

Automotive Infotainment USB Hub

Use Scenario: Supplies 5V/3A to LCD backlight driver and touch controller in portable ultrasound devices.

IC Role / Device Role / Timing Role: Main DC/DC stage stepping down 12V battery-derived input to 5V; handles dynamic backlight load steps.

Use Value: Cycle-by-cycle current limit prevents fault propagation during short-circuit events; thermal shutdown ensures safety compliance.

Use Scenario: Powers USB 2.0 hub ICs and level translators in automotive infotainment head units with 12V nominal battery input.

IC Role / Device Role / Timing Role: Pre-regulator converting 12V to 5V before linear LDOs; withstands cold-crank (6V) and load-dump (30V) transients.

Use Value: 28V absolute max input rating and 4.75–28V operating range cover full automotive battery envelope without external protection.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2303DQ-LF-Z	Same silicon, 3×3mm QFN10 package with lower θ_JA (50°C/W) but tighter layout constraints; no exposed pad on top side.	Better thermal performance in space-constrained designs; requires 10-pin routing and stencil-defined solder paste for exposed pad.	Select when PCB real estate is limited and thermal margin is critical; avoid if manual rework or wave soldering is required.
TPS54302DDCR	TI part: 3A, 3.5–28V input, 570kHz freq, 0.8V ref, but higher quiescent current (42μA) and no integrated BST cap drive.	Lacks integrated bootstrap capacitor drive circuitry; requires external diode/cap for high-duty-cycle operation.	Choose only if system already uses TI ecosystem tools; MP2303DN-LF-P offers lower IQ and simpler BST implementation.

Compared with MP2303DQ-LF-Z, MP2303DN-LF-P trades thermal efficiency for assembly simplicity and reworkability; versus TPS54302DDCR, it delivers superior light-load efficiency and eliminates external BST components - critical for cost-sensitive, high-volume notebook designs.

Availability

MP2303DN-LF-P is available at Aetrix Electronics and suitable for industrial PLCs, notebook computers, medical point-of-care displays, and automotive infotainment systems requiring stable component supply with RoHS-compliant packaging and full traceability.

Supply support for MP2303DN-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, headquartered in Kirkland, WA, with global design and support centers.

The MP2303 belongs to MPS's monolithic synchronous buck regulator product line, designed for high-efficiency, compact DC/DC conversion in space- and thermally-constrained applications such as computing, industrial, and automotive systems.

FAQ

What is the minimum recommended output capacitor for stable operation?

The MP2303DN-LF-P is stable with ≥22μF ceramic output capacitance (e.g., two 22μF X5R 10V MLCCs in parallel). Lower values may cause instability or excessive ripple; use 47μF or more for 3.3V/3A outputs. ESR should be <10mΩ for ceramic types.

Can MP2303DN-LF-P operate with 3.3V input?

No - the absolute minimum input voltage is 4.75V per datasheet specifications. At 3.3V input, the device will not start or regulate due to UVLO activation and insufficient headroom for gate drive. Use a different regulator (e.g., MP2143) for sub-4.75V inputs.

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

Soft-start time t_SS = C_SS × 6μA / 0.8V. For example, a 100nF capacitor yields t_SS ≈ 75ms. This formula assumes ideal conditions; actual ramp time may vary ±10% due to process tolerance and temperature drift.

Is an external bootstrap diode required for 5V output operation?

An external Schottky diode (e.g., IN4148) from V_OUT to BS is recommended when duty cycle exceeds 65% - i.e., when V_IN < 7.7V for 5V output. It improves high-side gate drive strength and efficiency under heavy load or low-input conditions.

What is the maximum allowable inductor DCR for thermal stability?

Inductor DCR should be ≤30mΩ to limit I²R heating at 3A load. Higher DCR increases temperature rise and reduces efficiency; verify peak inductor current (I_LOAD + ΔI_L/2) stays below 6.3A switch limit.

Does MP2303DN-LF-P support forced PWM mode?

No - the MP2303DN-LF-P operates exclusively in current-mode PWM with automatic pulse-skipping at light loads. It does not offer selectable modes (e.g., FPWM, PFM) or external frequency synchronization capability.

How is the compensation network selected for a 12V output with aluminum electrolytic output capacitors?

For 12V output with 220μF/30mΩ aluminum capacitor, use R3 = 100kΩ, C3 = 2.2nF, and omit C6 (per Table 3). The ESR zero (~24kHz) falls below half-switching frequency, but MP2303's internal compensation is optimized for this case without added pole.

MP2303DN-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) 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):: 28V

Voltage - Input (Max):: 25V

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:: 8-SOICE

MP2303DN-LF-P FAQ

1.How can I place an order for MP2303DN-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2303DN-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 MP2303DN-LF-P reliable?

The price and inventory of MP2303DN-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 MP2303DN-LF-P is usually 5 days.

3.What payment methods are accepted for MP2303DN-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2303DN-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2303DN-LF-P?

MP2303DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2303DN-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 MP2303DN-LF-P?

For technical support, including MP2303DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2303DN-LF-P requirements.

6.How does Aetrix verify that MP2303DN-LF-P is sourced from the original manufacturer or authorized distributors?

All MP2303DN-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 MP2303DN-LF-P meets industry standards.

7.What is the process for return or replacement of MP2303DN-LF-P?

All MP2303DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2303DN-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 MP2303DN-LF-P part is unused and in its original packaging.

Return procedure for MP2303DN-LF-P:

1.Submit a request within 90 days.

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

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